January Weather in Tehran, Iran

Last updated: August 21, 2025

In January, Tehran, Iran experiences a cold winter climate marked by a maximum temperature of 12°C (53°F) and a minimum of -16°C (3°F), with an average temperature around -2°C (29°F). The month sees 39 mm (1.5 in) of precipitation spread across 6 days, contributing to a humidity level of approximately 70%. Visitors can expect crisp air and occasional rain, making it essential to bundle up to enjoy the vibrant city amidst its winter charm.

January Temperature in Tehran

In Tehran, Iran, January brings a mix of winter chill and the anticipation of spring. With temperatures ranging from a brisk -16°C (3°F) at night to a milder 12°C (53°F) during the day, the average temperature settles at -2°C (29°F). This month often marks the coldest period of the year, showcasing a sharp contrast to the following months, where a gradual rise is evident. As February approaches with even lower nighttime temperatures, the city gradually begins to thaw, eventually leading into the warmth of March and April. The significant temperature shifts reflect Tehran's dynamic climate, transitioning from the stark cold of winter to the more temperate and pleasantly warm days of early spring.

January Weather in Tehran: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Tehran, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tehran, January typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec283242526376817872574234
Data source: Temperature data for Tehran generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Tehran

In January, Tehran experiences a moderate level of precipitation, with an average of 39 mm (1.5 in) spread over approximately 6 days. This sets the tone for the wetter months that follow, as February witnesses a jump to 66 mm (2.6 in), highlighting a trend of increasing rainfall that peaks in April with 70 mm (2.8 in). As winter transitions to spring, the frequency of rain also increases, evident from 9 days in February to 11 in April. However, as summer approaches, the precipitation dramatically declines, reducing to just a few millimeters and limited to only one or two days per month from June to August. This cyclical pattern underscores Tehran’s dry summer months, contrasting sharply with the wetter winter and spring periods, thus illustrating the city's diverse climatic nuances.

January Precipitation Trends in Tehran

The chart displays monthly precipitation patterns in Tehran, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Tehran, January typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec39665870344614314735
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Tehran

In January, Tehran experiences a relatively high humidity level of 70%, setting a distinctly moist tone for the month. This trend continues into December, where humidity mirrors January's figures, while November peaks at an even higher 72%. As the seasons shift, humidity begins to decline, dipping to 66% in February and stabilizing around 68% in March. By April, the atmosphere becomes significantly drier at 62%, continuing this trend through to June, where it remains consistently low at 62%. The summer months bring a notable decrease, with July and August showcasing the driest conditions at 52% and 40%, respectively. As the year progresses into fall, humidity sees a gradual uptick again, with October rising to 61% before the cycle returns to the moist conditions familiar at the start of the year. This fluctuation in humidity illustrates Tehran's distinct seasonal changes, where January and November stand out as the months with the highest moisture levels, contrasting sharply with the dry summer months.

January Average Humidity in Tehran

This chart illustrates the average monthly humidity levels in Tehran, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Tehran is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%66%68%62%64%62%52%40%45%61%72%70%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Tehran

In January, Tehran experiences a moderate UV Index of 4, with a burn time of 30 minutes for fair-skinned individuals. As the month progresses into February, UV intensity climbs to 6, shifting into the high exposure category, which reduces burn time to 25 minutes. This upward trend continues into the spring months, peaking in May with an extreme UV Index of 13 and a mere 10 minutes of safe exposure time. Notably, the UV Index remains extreme throughout the summer, reaching 12 in June and 11 in July, before gradually tapering off in the fall. By November, it dips back to a moderate 5, maintaining a burn time of 30 minutes, and further decreases to 3 in December, emphasizing the dynamic seasonal variations in solar exposure in Tehran. For more detailed information on UV levels throughout the year, visit Tehran UV Index.

Maximum UV Index Levels in Tehran for January

The chart shows the monthly maximum UV Index (UVI) for Tehran in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Tehran typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46891312111010753
Data source: Tehran January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

January Sunshine in Tehran

In January, Tehran basks in 225 hours of sunshine, a gentle prelude to the sun-drenched months that follow. As winter transitions into spring, the city experiences a steady increase in sunlight, soaring to 270 hours in February and peaking at 336 hours by April. This upward trend continues into the warm summer months, with June and July showcasing an impressive 393 and 394 hours of radiant sunshine, respectively. As summer wanes, the city gradually steps down into a cascade of sunlight, ending the year with 267 hours in December. Overall, Tehran's solar journey through January to December reflects a vibrant rhythm, with each month weaving a tapestry of light that accentuates the city's dynamic seasons.

Monthly Sunshine Duration in Tehran: January Highlighted

The January sunshine duration represents the total number of hours Tehran experiences direct sunlight during the month of January, excluding cloudy or obstructed periods. This chart compares the sunshine duration of January with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec225h270h319h336h382h393h394h377h342h311h256h267h
Data source: Tehran January Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Tehran During January

In Tehran, the likelihood of enjoying sunny weather in January is remarkably high at 81%, setting the tone for a bright start to the year. This trend of sunshine gradually decreases in the following months, with February showing a 69% chance, while March and April dip to 58% and 57% respectively, suggesting a transition towards more variable weather. However, as the year progresses, the sunshine returns forcefully in the warmer months, peaking at an impressive 99% in September. Overall, January stands out as one of the months with a strong promise of clear skies, before the city experiences a seasonal shift that brings a mix of sun and clouds.

Percentage of Sunny Days in January in Tehran

The chart illustrates the percentage of sunny days in Tehran throughout the year, with January highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Tehran experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec81%69%58%57%61%94%87%88%99%85%57%68%
Data source: Tehran January chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Tehran in January

In Tehran, the daylight duration in January offers a crisp 10 hours of sunlight, a steady rhythm that carries through into February. As March arrives, the length of daylight subtly begins to lengthen, extending to 11 hours, signaling the onset of spring. By April, daylight increases further to 13 hours, and continues to reach its peak during the summer months of May, June, and July, each basking in a generous 14 hours of sunshine. As summer fades, August witnesses a slight decline, followed by a gradual descent through September and October, where daylight diminishes to 12 and then 11 hours, respectively. The cycle of light recedes again into the winter months, with November and December experiencing the shortest days, dropping to 10 and 9 hours. This rhythm of daylight showcases Tehran's vibrant seasonal transitions, inviting residents and visitors alike to savor each moment of sunshine throughout the year.

Average Daylight Hours in Tehran for January

The chart illustrates the variation in daylight duration in Tehran throughout the year, with January highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 1m10h 52m11h 58m13h 6m14h 2m14h 31m14h 16m13h 26m12h 22m11h 14m10h 16m9h 46m
Data source: Tehran daylight hours, calculated by summing the hours between sunrise and sunset for each day.

January Winds in Tehran

In Tehran during January, the wind whispers gently through the city at an average speed of 1.7 m/s (4 mph), setting the stage for a serene winter experience. This consistent breeze continues into February, maintaining the same pace. As spring approaches, a slight increase is observed, with March recording a gentle rise to 1.8 m/s. By April and May, the winds pick up slightly to 1.9 m/s, hinting at the warmer season ahead. As summer rolls in, the wind reaches a modest peak of 2.2 m/s (5 mph) in both June and July, before gently tapering off in August. The transition into autumn brings a gradual decline, with wind speeds dipping to 1.5 m/s (3 mph) by November, and then slightly recovering to 1.7 m/s in October. December sees the year close with a swift breeze of 1.6 m/s, reflecting the city’s calm yet dynamic climate through the months. Overall, the winds of Tehran are characterized by a subtle rhythm, rising ever so slightly with the changing seasons while providing a refreshing backdrop for the city's vibrant life.

Average January Wind Speed in Tehran

The chart displays monthly wind speed patterns in Tehran, with values for each month shown alongside January's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how January's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec1.7 m/s1.71.81.91.92.22.21.92.11.71.51.6
Data source: Tehran January wind data, generated using information from the Copernicus Climate Change Service.

How January Weather in Tehran Compares to Other Months

Weather in Tehran varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Tehran, focusing on differences in temperature, rainfall, humidity, and UV levels.

In January, temperatures in the region typically range from a minimum of -16°C (3°F) to a maximum of 12°C (53°F), with an average temperature of -2°C (29°F). The month sees approximately 39 mm (1.5 in) of precipitation spread over 6 days and maintains a humidity level of around 70%. In contrast, February experiences slightly colder conditions, with minimum temperatures dropping to -23°C (-9°F) and an average temperature of 0°C (32°F). Precipitation increases to 66 mm (2.6 in) over 9 days, while humidity decreases to 66%. For a more detailed look at February weather in Tehran, visit Tehran weather in February.

January and March present stark contrasts in weather conditions. In January, temperatures can drop to a chilly minimum of -16°C (3°F), with an average of -2°C (29°F) and a maximum of 12°C (53°F). This month experiences around 39 mm (1.5 in) of precipitation over 6 days, coupled with a high humidity level of 70%. In contrast, March brings a noticeable warming trend, where the minimum temperature is -8°C (17°F) and the average climbs to 5°C (42°F), peaking at a pleasant 21°C (70°F). Precipitation also increases slightly to 58 mm (2.3 in) across 10 days, with humidity remaining relatively stable at 68%. For more detailed insights about March weather, check out Tehran weather in March.

January and April exhibit stark contrasts in weather conditions. In January, temperatures range from a chilling -16°C (3°F) to a maximum of 12°C (53°F), with an average temperature around -2°C (29°F). During this month, precipitation is relatively low at 39 mm (1.5 in) over just 6 days, while humidity sits at a high 70%. In contrast, April experiences a significant warming trend, with temperatures soaring from a minimum of -7°C (19°F) to a maximum of 25°C (77°F), resulting in an average of 11°C (53°F). However, April also brings increased rainfall, totaling 70 mm (2.8 in) over 11 days, with humidity slightly reduced to 62%. For more details about the weather in Tehran during April, check out Tehran weather in April.

In January, the weather is notably cold, with minimum temperatures dropping to -16°C (3°F) and averaging around -2°C (29°F), while highs reach only 12°C (53°F). The month experiences about 39 mm (1.5 in) of precipitation over six days, accompanied by a relatively high humidity level of 70%. In contrast, May brings a significant warming trend, with temperatures ranging from a minimum of 4°C (40°F) to a pleasant average of 17°C (63°F), peaking at a comfortable 30°C (86°F). Although May sees slightly less precipitation at 34 mm (1.3 in) also spread over six days, the humidity drops to 64%, making the conditions feel more inviting. For more details, check out Tehran weather in May.

In January, temperatures in Tehran can drop as low as -16°C (3°F) and typically hover around an average of -2°C (29°F), with a maximum of 12°C (53°F). The weather is chilly, with a considerable humidity of 70% and light precipitation occurring on about 6 days, totaling 39 mm (1.5 inches). In contrast, June brings much warmer weather, with temperatures ranging from a minimum of 10°C (51°F) to a maximum of 33°C (92°F), averaging at a comfortable 24°C (76°F). Rain is scarce in June, with only 4 mm (0.2 inches) of precipitation over the course of a single day, and humidity decreases to 62%. For more details on June weather in Tehran, you can visit Tehran weather in June.

In January, the weather can be quite harsh, with temperatures ranging from a frigid minimum of -16°C (3°F) to an average of -2°C (29°F) and peaking at a relatively mild 12°C (53°F). The month experiences about 39 mm (1.5 in) of precipitation over six days, contributing to a humidity level of 70%. In stark contrast, July brings much more temperate conditions, with temperatures ranging from a minimum of 14°C (58°F) to an average of 27°C (81°F), and reaching a maximum of 36°C (96°F). This summer month is characterized by minimal rainfall of just 6 mm (0.2 in) on only one day, accompanied by lower humidity levels at 52%. For more details on July weather, visit Tehran weather in July.

In January, the weather in Tehran is characterized by much colder temperatures, with lows plunging to -16°C (3°F) and average temperatures around -2°C (29°F). Snow and rain are more common during this winter month, contributing to a total precipitation of 39 mm (1.5 in) over approximately six days, alongside a relatively high humidity level of 70%. In contrast, August brings a complete transformation with milder and warmer conditions, including minimum temperatures of 15°C (59°F) and average highs reaching 26°C (78°F) to a scorching maximum of 35°C (95°F). Notably, rainfall is scarce in August, with only 1 mm (0.1 in) and no recorded rainy days, resulting in a much lower humidity level of 40%. For a closer look at Tehran's August weather, you can visit Tehran weather in August.

In January, the weather is characterized by cold temperatures, with a minimum of -16°C (3°F) and an average of -2°C (29°F), often reaching a maximum of 12°C (53°F). This month also sees about 39 mm (1.5 in) of precipitation over approximately six days, contributing to a humidity level of 70%. In stark contrast, September boasts a much warmer climate, with minimum temperatures around 10°C (50°F) and an average of 22°C (72°F), peaking at 33°C (91°F). The month sees minimal rainfall of just 4 mm (0.2 in) with no days of recorded precipitation, and the humidity drops significantly to 45%. For more detailed insights, check out Tehran weather in September.

January and October present contrasting weather patterns. In January, temperatures can dip as low as -16°C (3°F), with an average of -2°C (29°F) and highs reaching 12°C (53°F). The month experiences 39 mm (1.5 in) of precipitation over six days, coupled with a humidity level of 70%. In contrast, October boasts much milder temperatures, ranging from a minimum of 1°C (34°F) to an average of 14°C (57°F) and a maximum of 26°C (79°F). With 31 mm (1.2 in) of precipitation, also spread over six days, October enjoys lower humidity at 61%. For more details about October weather specifically, check out Tehran weather in October.

January and November present contrasting weather patterns. In January, the temperatures are significantly colder, with a minimum of -16°C (3°F) and an average of -2°C (29°F), while November sees milder temperatures, ranging from -8°C (17°F) to a maximum of 20°C (68°F) and an average of 6°C (43°F). Precipitation in January amounts to 39 mm over 6 days, compared to November, where it is slightly higher at 47 mm over 8 days. Additionally, humidity levels are similar, with January at 70% and November at 72%. For a detailed look at November's climate, you can check Tehran weather in November.

In January, the weather tends to be slightly colder than in December, with average temperatures ranging from a minimum of -16°C (3°F) to a maximum of 12°C (53°F), compared to December's range of -14°C (6°F) to 13°C (55°F). Both months experience similar humidity levels at 70%, but January has slightly more precipitation at 39 mm (1.5 in) over 6 days, compared to December's 35 mm (1.4 in) over 7 days. For more detailed insights into the climate, you can check Tehran weather in December.

Compare Tehran's Climate with Cities Worldwide

Conclusion: What to Expect From January Weather in Tehran

In January, Tehran experiences a distinct climate shift compared to the milder months that precede it. With average temperatures dipping significantly and the chill of winter settling in, visitors will find themselves navigating through brisk days where highs barely reach 12°C (53°F) and lows can plummet to -16°C (3°F). This month stands out not only for its colder temperatures but also for increased humidity and precipitation, leading to frequent overcast days, ideal for cozy indoor activities. The city's weather showcases a unique tranquility during this time, making it a month of reflection. For a deeper dive into the seasonal patterns of Tehran, explore Tehran Climate.