May Weather in Tehran, Iran

Last updated: August 21, 2025

May in Tehran, Iran offers a delightful transition into warmer weather, where the maximum temperature reaches a comfortable 30°C (86°F), complemented by an average temperature of 17°C (63°F). Early mornings and evenings can feel quite cool, with temperatures dipping to a minimum of 4°C (40°F). The month sees around 34 mm (1.3 in) of precipitation spread over approximately 6 days, contributing to a humidity level of 64%. This blend of mild warmth and occasional rain makes May a refreshing time to experience the vibrant atmosphere of Tehran.

May Temperature in Tehran

In May, Tehran experiences a delightful transition into warmer weather, with temperatures ranging from a minimum of 4°C (40°F) to a pleasant maximum of 30°C (86°F). The average temperature settles at a comfortable 17°C (63°F), marking a significant leap from the lingering chill of the early months. This month showcases a remarkable shift from the cold winter and early spring, as milder days become more frequent, creating ideal conditions for outdoor activities and sightseeing. As the city bids farewell to the frosty grips of winter, the warmth of May invites both locals and visitors to embrace the beauty of its blooming gardens and vibrant streets.

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

The chart illustrates May 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, May 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.

May Precipitation in Tehran

In May, Tehran experiences a noticeable decline in precipitation, with 34 mm (1.3 in) of rain falling over just 6 days—a stark contrast to the wetter months preceding it. This decrease signals the transition towards the dry summer, as rainfall tapers off significantly from April's 70 mm (2.8 in). The month typically brings a refreshing change to the landscape, but the reduced wet days suggest a shift towards the more arid conditions that characteristically define the summer months. As spring wanes, the city's climate transitions smoothly toward the drier spells of June and beyond, setting the stage for a dramatic reduction in rainfall.

May Precipitation Trends in Tehran

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

In May, Tehran experiences a slight dip in humidity compared to the previous months, settling at 64%. This moderate level reflects a gradual improvement from the wetter winter months, where humidity peaked at 70% in January and maintained a steady presence in February and March. As spring unfolds, April showcases a notable decrease to 62%, paving the way for May's conditions, which are typically more comfortable. The clear trend continues into early summer with June's humidity further dropping to 62% and July reaching a decidedly drier 52%. Overall, May serves as a transitional month, heralding the approach of warmer and drier days ahead in Tehran's climate cycle.

May Average Humidity in Tehran

This chart illustrates the average monthly humidity levels in Tehran, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Tehran

As May unfolds in Tehran, the UV Index reaches an alarming 13, marking it as an extreme exposure category with a burn time as brief as 10 minutes. This dramatic rise from the 9 recorded in April highlights a significant trend toward increased sun intensity as summer approaches, emphasizing the need for diligent sun protection. As temperatures rise, so too does the risk of harmful UV exposure, making it essential for residents and visitors alike to take precautions. With the UV Index remaining high in subsequent months, including a 12 in June, May serves as a critical reminder of the precautions needed to safeguard against the sun's potent rays. For more information, check out the detailed Tehran UV Index.

Maximum UV Index Levels in Tehran for May

The chart shows the monthly maximum UV Index (UVI) for Tehran in May, 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 May, the maximum UV index in Tehran typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46891312111010753
Data source: Tehran May 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.

May Sunshine in Tehran

May is a spectacular month in Tehran, boasting an impressive 382 hours of sunshine. This marks a delightful transition as the city emerges from the shorter, winter months. Following a steady increase in daylight from January's 225 hours, sunshine hours swell significantly each month, peaking in July with a slight decrease towards fall. The gradual buildup of light throughout spring culminates in the vibrant warmth of May, providing an ideal backdrop for outdoor activities and cultural events. As the sweltering summer approaches, May’s abundant sunshine invites residents and visitors alike to soak in the beauty of Tehran's blooming landscape, making it a truly enchanting time to experience the city.

Monthly Sunshine Duration in Tehran: May Highlighted

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

Chance of Sun in Tehran During May

In Tehran, Iran, the likelihood of sunny weather in May stands at 61%, suggesting a mild start to the summer season. While this percentage indicates a moderate chance of sunshine, it is notably higher than the previous months of April (57%) and March (58%). This gradual increase hints at the city's transition into warmer months, with the sun making a more consistent appearance. As the year progresses into June and July, the likelihood of sunny days skyrockets to 94% and 87%, respectively. Overall, while May may not boast the sunniest skies, it serves as a bridge between the cooler months and the sun-drenched days of summer ahead, making it an ideal time for outdoor activities and exploration.

Percentage of Sunny Days in May in Tehran

The chart illustrates the percentage of sunny days in Tehran throughout the year, with May 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 May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Tehran in May

As spring unfolds in Tehran, May heralds a delightful increase in daylight, offering 14 hours of precious sunlight. This trend of extending daylight begins in March, when the city experiences its first significant jump to 11 hours. By April, the days grow even longer, reaching 13 hours, creating a vibrant atmosphere filled with the promise of summer. June and July maintain this 14-hour stretch, providing ample opportunity for outdoor activities. However, as autumn approaches, daylight begins to wane, gradually dipping back to 10 hours by November and further decreasing to a mere 9 hours in December. This dynamic rhythm of light and darkness not only shapes daily life but also marks the distinct seasons in Tehran, inviting both residents and visitors to bask in the sunshine while it lasts.

Average Daylight Hours in Tehran for May

The chart illustrates the variation in daylight duration in Tehran throughout the year, with May 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.

May Winds in Tehran

In May, Tehran experiences a gentle breeze with an average wind speed of 1.9 m/s (4 mph), reminiscent of the increasing energy of spring as it transitions into the summer months. This slight uptick in wind speed from previous months like April, where it also measured 1.9 m/s, reflects a trend of gradual escalation that continues into the hotter months of June and July, which each see an increase to 2.2 m/s (5 mph). The consistency of light winds throughout the earlier months, hovering between 1.5 to 1.9 m/s (3-4 mph), sets a tranquil backdrop, while May's winds hint at the vibrant change on the horizon, creating an ideal atmosphere for enjoying Tehran's blossoming landscapes. As summer approaches, the winds pick up just enough to invigorate the warm air, making May a perfect time for outdoor activities before the heat sets in.

Average May Wind Speed in Tehran

The chart displays monthly wind speed patterns in Tehran, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec1.71.71.81.91.9 m/s2.22.21.92.11.71.51.6
Data source: Tehran May wind data, generated using information from the Copernicus Climate Change Service.

How May 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 May’s weather to other months in Tehran, focusing on differences in temperature, rainfall, humidity, and UV levels.

May and January present a stark contrast in weather conditions. In May, temperatures range from a minimum of 4°C (40°F) to a maximum of 30°C (86°F), with an average of 17°C (63°F), creating a warm and pleasant atmosphere. Precipitation is relatively low at 34 mm (1.3 in) over six days, and humidity sits at a moderate 64%. In contrast, January experiences much colder temperatures, with a minimum of -16°C (3°F) and a maximum of 12°C (53°F), resulting in an average of -2°C (29°F). While precipitation is slightly higher at 39 mm (1.5 in) over the same six days, humidity is also elevated at 70%. For more detailed information, visit Tehran weather in January.

The weather in May is significantly warmer than in February, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 30°C (86°F) and an average temperature of 17°C (63°F). In contrast, February experiences much colder conditions, with temperatures ranging from a frigid -23°C (-9°F) to a maximum of 11°C (52°F) and an average of just 0°C (32°F). While May sees less precipitation, with only 34 mm (1.3 in) of rain over an average of 6 days, February is wetter, accumulating 66 mm (2.6 in) of precipitation during 9 days. Interestingly, both months share a similar humidity level around 64-66%. For a detailed look at February's weather, you can visit Tehran weather in February.

In comparing the weather between May and March, it's clear that May enjoys significantly warmer temperatures, with an average of 17°C (63°F) compared to March's 5°C (42°F). While March can still experience chilly nights with a minimum temperature of -8°C (17°F), May sees temperatures range from a pleasant 4°C (40°F) at night to a warm maximum of 30°C (86°F) during the day. Additionally, May is generally drier, with only 34 mm (1.3 in) of precipitation over six days, while March receives 58 mm (2.3 in) over ten rainy days. Humidity levels are slightly lower in May at 64%, compared to March's 68%, contributing to a more comfortable feel during the month. For more details on March weather specifically, visit Tehran weather in March.

In comparing the weather patterns of May and April, May presents a notably warmer climate with average temperatures reaching 17°C (63°F), while April's average temperature sits lower at 11°C (53°F). Additionally, May experiences a wider range in temperature, with maximums peaking at 30°C (86°F) compared to April’s maximum of 25°C (77°F). Precipitation is also more abundant in April, with 70 mm (2.8 in) recorded over 11 days, whereas May sees significantly less with only 34 mm (1.3 in) over 6 days. Humidity levels are quite similar, sitting at 64% in May and slightly lower at 62% in April, suggesting a comfortable but changing atmosphere as spring transitions into early summer. For more details, visit Tehran weather in April.

May and June display notable differences in weather patterns. In May, temperatures range from a minimum of 4°C (40°F) to a maximum of 30°C (86°F), with an average of 17°C (63°F). This month experiences more precipitation, totaling 34 mm (1.3 in), spread over about six days, and maintains a humidity level of 64%. In contrast, June enjoys a milder climate, with temperatures starting at a minimum of 10°C (51°F) and reaching up to 33°C (92°F), averaging around 24°C (76°F). Precipitation in June is significantly lower at just 4 mm (0.2 in) over only one day, and humidity decreases slightly to 62%. For more detailed information, visit Tehran weather in June.

May and July present distinct contrasts in weather. In May, temperatures range from a minimum of 4°C (40°F) to a maximum of 30°C (86°F), with an average of 17°C (63°F). The month experiences around 34 mm (1.3 in) of precipitation over approximately 6 days, alongside a humidity level of 64%. In contrast, July is significantly warmer, with temperatures fluctuating between a minimum of 14°C (58°F) and a peak of 36°C (96°F), averaging at 27°C (81°F). This month is much drier, with only 6 mm (0.2 in) of precipitation on just 1 day, and the humidity drops to 52%. For more detailed insights, check out Tehran weather in July.

May and August present contrasting weather patterns, showcasing the transition from spring to summer. In May, temperatures range from a cool 4°C (40°F) at night to a warmer average of 17°C (63°F), with peaks reaching 30°C (86°F). The month is characterized by moderate humidity at 64% and some precipitation, averaging 34 mm (1.3 in) over about 6 days. In contrast, August experiences much warmer conditions, with nighttime lows of 15°C (59°F) and an average high of 26°C (78°F), peaking at 35°C (95°F). August boasts significantly drier weather, with minimal rainfall of just 1 mm (0.1 in) and no rainy days, along with lower humidity at 40%. For more specifics on August weather, you can visit Tehran weather in August.

In May, the weather is characterized by a significant temperature range, with minimums dropping to around 4°C (40°F) and daytime highs reaching up to 30°C (86°F). The average temperature sits at a comfortable 17°C (63°F), though it comes with higher humidity at 64% and a modest amount of precipitation, averaging 34 mm (1.3 in) over approximately six days.

In contrast, September enjoys a more stable and warmer climate, with minimum temperatures starting at 10°C (50°F) and highs peaking at 33°C (91°F), resulting in an average of 22°C (72°F). This month boasts significantly less rainfall, with only 4 mm (0.2 in) recorded and no rainy days, alongside lower humidity levels at 45%. For more details, you can check the Tehran weather in September.

May and October showcase contrasting atmospheres in terms of weather. In May, temperatures range from a minimum of 4°C (40°F) to a pleasant average of 17°C (63°F), peaking at a warm 30°C (86°F). The month experiences about 34 mm (1.3 in) of rainfall over 6 days, paired with a humidity level of 64%. In comparison, October brings cooler temperatures, with a minimum of 1°C (34°F) and an average of 14°C (57°F), while the maximum reaches 26°C (79°F). Precipitation slightly decreases to 31 mm (1.2 in) over the same number of rainy days, and the humidity remains relatively low at 61%. For more details, check out Tehran weather in October.

May and November present stark contrasts in weather, reflecting the transition from spring to winter. In May, temperatures range from a mild 4°C (40°F) at night, peaking at a comfortable 30°C (86°F) during the day, accompanied by relatively low precipitation of 34 mm (1.3 in) over just 6 days. The humidity level sits at 64%, making it feel pleasant overall.

In contrast, November ushers in chillier conditions, with nighttime temperatures dropping to a brisk -8°C (17°F) and daytime highs averaging 6°C (43°F) and reaching a maximum of 20°C (68°F). This month experiences more rainfall, totaling 47 mm (1.9 in) across 8 days, and the humidity increases to 72%. For more detailed insights, you can check Tehran weather in November.

May and December in Tehran present starkly contrasting weather profiles. In May, temperatures range from a comfortable minimum of 4°C (40°F) to a warm maximum of 30°C (86°F), with an average of 17°C (63°F). The month sees around 34 mm (1.3 in) of precipitation over approximately six days and a humidity level of 64%. In contrast, December brings frigid temperatures, dipping as low as -14°C (6°F) and peaking at 13°C (55°F), with an average temperature of just 1°C (34°F). Precipitation slightly increases to 35 mm (1.4 in), occurring over about seven days, alongside a higher humidity of 70%. For a more detailed look at December weather, visit Tehran weather in December.

Compare Tehran's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Tehran

As spring reaches its peak, May in Tehran unfurls a delightful transition from the cooler temperatures of earlier months, introducing warmer days interspersed with refreshing breezes. With the average temperature hovering around a comfortable 17°C (63°F), May invites residents and visitors alike to enjoy the city's vibrant outdoors. Although 34 mm (1.3 in) of rainfall may surprise some, the periodic showers tend to be brief, allowing for sunny moments to prevail. Compared to the brisk beginnings of the year, the humidity at 64% adds a hint of warmth to the air, creating a pleasant backdrop for exploring Tehran’s bustling streets. For a deeper dive into the city's climate and weather patterns, explore Tehran Climate.