September Weather in Tehran, Iran

Last updated: August 21, 2025

In September, Tehran experiences a delightful transition into autumn, with temperatures reaching a maximum of 33°C (91°F) and an average of 22°C (72°F), providing pleasantly warm days. Nighttime brings a refreshing drop to a minimum of 10°C (50°F), creating ideal conditions for evening outings. Notably, the month is characterized by minimal rainfall, with only 4 mm (0.2 in) recorded and no precipitation days, ensuring abundant sunshine throughout the month. The humidity level hovers around 45%, contributing to a comfortable atmosphere that locals and visitors alike can enjoy. Embrace the vibrancy of Tehran in September, a time when the city's beauty shines against a backdrop of clear skies.

September Temperature in Tehran

As September unfolds in Tehran, the city witnesses a shift towards milder temperatures, heralding the transition from the sweltering summer months. With minimums averaging around 10°C (50°F) and maximums peaking at a comfortable 33°C (91°F), the overall average hovers at a pleasant 22°C (72°F). This month offers a perfect blend of warmth and coolness, making it an ideal time for outdoor exploration and enjoying the vibrant atmosphere of the city. The steady decline in temperatures compared to the scorching highs of July and August suggests a welcome relief, inviting both locals and visitors to bask in the agreeable early autumn weather before the colder months set in.

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

The chart illustrates September 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, September 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.

September Precipitation in Tehran

In September, Tehran experiences a significant drop in precipitation, receiving a mere 4 mm (0.2 in), marking one of the driest months of the year alongside August. This month sees a complete absence of rainfall days, a stark contrast to the wetter spring months, where precipitation peaks, particularly in April with 70 mm (2.8 in) over 11 days. The transition into autumn is characterized by the return of slightly higher rainfall in October, which anticipates 31 mm (1.2 in), suggesting that while September may be dry, the atmosphere is preparing for the seasonal shift, emphasizing the city's dynamic climate.

September Precipitation Trends in Tehran

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

As summer transitions into fall in Tehran, September experiences a slight uptick in humidity, averaging at 45%. This marks a modest recovery from the dry heat of August, which saw levels plummet to 40% – the lowest of the year. The trend reveals a gradual return towards the wetter conditions typical of the earlier months, though still significantly lower than the humid highs of winter, which hover around 70% in January and December. The changing moisture levels not only influence the city's climate but also signal the approaching chill of October, where humidity rises again to about 61%, bringing a fresh breath to the urban landscape.

September Average Humidity in Tehran

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

September UV Index in Tehran

In September, Tehran experiences a very high UV Index of 10, signaling the need for sun protection as the burn time shortens to just 15 minutes. This marks a transition from the extreme levels seen during the summer months. Since May, when the UV Index peaked at an extreme 13, there has been a gradual decline but with significant caution still required. The UV levels remain high through the early autumn, reflecting a consistent trend of elevated solar exposure typical for this period in Tehran. As fall approaches, residents and visitors should stay informed about the UV Index to safeguard their skin. For detailed insights, visit Tehran UV Index.

Maximum UV Index Levels in Tehran for September

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

September Sunshine in Tehran

As summer gracefully transitions into autumn, September in Tehran boasts an impressive 342 hours of sunshine, a delightful wind-down from the sun-soaked peaks of July and August. The city's daylight reaches its pinnacle during the warmer months, peaking at 394 hours in July, before gradually tapering off. While the sunshine begins to wane, September still enjoys a robust offering of clear skies and warm days, outshining the earlier winter months of January with only 225 hours. This month stands as a beautiful bridge, showcasing the last of summer's vitality while heralding the cooler days to come, making it an ideal time for both residents and visitors to relish the lingering warmth and vibrant outdoor life.

Monthly Sunshine Duration in Tehran: September Highlighted

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

Chance of Sun in Tehran During September

As September arrives in Tehran, the likelihood of basking in sunny weather reaches an impressive 99%. This remarkable figure not only underscores September's charm but also aligns with the peak of summer, where sunny days are at their highest. Following the consistent warmth of June, July, and August—where sun probabilities linger around 87% to 94%—September emerges as a standout month, promising nearly perfect conditions for outdoor activities. As the city transitions into autumn, the sun's vibrant presence remains a delightful farewell to summer, making it an ideal time for both locals and travelers to soak in the radiant skies before the cooler months set in.

Percentage of Sunny Days in September in Tehran

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

Daylight Hours in Tehran in September

Throughout the year in Tehran, the daylight duration experiences a notable ebb and flow, with September marking a gentle transition towards shorter days. As summer fades, the month offers an average of 12 hours of daylight, a slight decrease from the 13 hours seen in August. This gradual reduction reflects the shifting seasons, as daylight begins to wane after the longest summer days of 14 hours in June and July. Following September, the city heads into October and November, where 11 and 10 hours of daylight respectively become commonplace, signaling the approach of winter. This rhythmic pattern not only highlights the rich diversity of Tehran's climate but also sets the stage for the cozy, introspective seasons ahead.

Average Daylight Hours in Tehran for September

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

September Winds in Tehran

As September arrives in Tehran, the breeze begins to pick up slightly, with an average wind speed of 2.1 m/s (5 mph), signalling a transition into the autumn months. This gentle increase in wind velocity from the summer's 1.9 m/s reflects a shift in the seasonal dynamics of the region. It's a refreshing change after the warm summer months, and while the winds remain mild compared to the stronger gusts of winter, they provide a gentle reminder of the upcoming seasonal transitions. Throughout the year, Tehran experiences a gradual cycling of wind speeds, but September’s slight uptick sets an inviting tone for the cooler days ahead, making it a delightful time for both locals and visitors to enjoy the city's vibrant atmosphere.

Average September Wind Speed in Tehran

The chart displays monthly wind speed patterns in Tehran, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec1.71.71.81.91.92.22.21.92.1 m/s1.71.51.6
Data source: Tehran September wind data, generated using information from the Copernicus Climate Change Service.

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

September and January present a striking contrast in weather conditions. In September, temperatures range from a mild 10°C (50°F) at night to a warm 33°C (91°F) during the day, with low humidity at 45% and little to no precipitation. In contrast, January features a much colder climate, with temperatures dropping to a minimum of -16°C (3°F) and peaking at just 12°C (53°F). This month also sees significantly higher humidity at 70% and an average precipitation of 39 mm (1.5 in) over six days. For more details on winter weather, check out Tehran weather in January.

September and February present striking contrasts in weather conditions. In September, temperatures range from a mild 10°C (50°F) at night to a warm 33°C (91°F) during the day, with an average of 22°C (72°F). The month is characterized by low precipitation, totaling just 4 mm (0.2 in), and dry conditions with no rainy days. In stark contrast, February features a much colder climate with temperatures dropping to a minimum of -23°C (-9°F) and peaking at 11°C (52°F), averaging around 0°C (32°F). This winter month experiences significantly higher precipitation, with 66 mm (2.6 in) spread over 9 rainy days, and a notable increase in humidity to 66%. For more detailed information, you can check Tehran weather in February.

In September, the weather is typically warm and pleasant, with average temperatures around 22°C (72°F) and maximum highs reaching up to 33°C (91°F). The month is characterized by low precipitation, totaling just 4 mm (0.2 in), and a comfortable humidity level at 45%. In contrast, March experiences a significant drop in temperature, with average readings around 5°C (42°F) and minimums plummeting to -8°C (17°F). This month also sees much higher precipitation at 58 mm (2.3 in) spread over about 10 days and a higher humidity level of 68%. For more detailed insights into March weather, visit Tehran weather in March.

When comparing the weather in September and April, we see a striking contrast. September enjoys a warmer climate with average temperatures reaching 22°C (72°F) and maximums soaring up to 33°C (91°F), accompanied by very little precipitation and a humidity level of 45%. In stark contrast, April experiences cooler temperatures, with averages around 11°C (53°F) and highs of just 25°C (77°F), along with significant rainfall of 70 mm (2.8 in) over 11 days and higher humidity at 62%. These differences highlight the transition from the warmth of late summer to the chill of early spring. For more detailed insights, check out Tehran weather in April.

In comparing the weather of September and May, September tends to be warmer and drier. September experiences temperatures ranging from a minimum of 10°C (50°F) to a maximum of 33°C (91°F), with an average of 22°C (72°F) and a notably low precipitation level of just 4 mm (0.2 in) over 0 days, contributing to a comfortable humidity of 45%. In contrast, May is cooler, with temperatures ranging from 4°C (40°F) to 30°C (86°F), and an average temperature of 17°C (63°F). May sees significantly more rainfall, totaling 34 mm (1.3 in) across 6 days and a higher humidity level of 64%. For more detailed insights, check out Tehran weather in May.

In September, the weather features a moderate temperature range, with a minimum of 10°C (50°F) and an average high of 33°C (91°F), maintaining relatively low humidity at 45%. Notably, this month enjoys dry conditions with no recorded precipitation. In contrast, June presents a slightly warmer average temperature of 24°C (76°F) and similar maximums, but with higher humidity at 62% and one day of recorded precipitation. For more detailed information about June weather, you can refer to Tehran weather in June.

In comparing the weather of September and July, September presents a slightly milder climate, with average temperatures ranging from a minimum of 10°C (50°F) to a maximum of 33°C (91°F), while July typically experiences higher temperatures, peaking at 36°C (96°F) and averaging 27°C (81°F). Although both months see minimal precipitation, July has a bit more, with 6 mm (0.2 in) recorded over one day, compared to September's 4 mm (0.2 in) with no rainy days. Humidity levels also differ, as September offers a lower average humidity of 45%, while July's humidity is higher at 52%. For more detailed information about July weather in Tehran, you can refer to Tehran weather in July.

In comparing the weather of September to that of August, September exhibits a more moderate temperature range with a minimum of 10°C (50°F) and an average of 22°C (72°F), while August features warmer conditions, starting at a minimum of 15°C (59°F) and averaging 26°C (78°F). The maximum temperature in September peaks at 33°C (91°F), slightly lower than August's maximum of 35°C (95°F). Both months have minimal precipitation, with September receiving only 4 mm (0.2 in) and August 1 mm (0.1 in), and neither month experiences any rainy days. Additionally, September's humidity stands at 45%, which is slightly higher than August’s 40%. For a closer look at August's climate, visit Tehran weather in August.

September offers warm temperatures with a minimum of 10°C (50°F) and an average of 22°C (72°F), peaking at 33°C (91°F). The month is characterized by low precipitation, with just 4 mm (0.2 in) and no rainy days, alongside mild humidity at 45%. In contrast, October sees a significant drop in temperatures, starting at a minimum of 1°C (34°F) and averaging 14°C (57°F), while the maximum reaches 26°C (79°F). Rainfall increases notably to 31 mm (1.2 in) over six days, and humidity rises to 61%. For more detailed information, visit Tehran weather in October.

September and November present a stark contrast in weather conditions. In September, temperatures range from a mild 10°C (50°F) at night to a warm 33°C (91°F) during the day, with an average of 22°C (72°F). The month features minimal precipitation, recording only 4 mm (0.2 in) and boasts low humidity at 45%. In contrast, November sees a substantial drop in temperatures, with nighttime lows of -8°C (17°F) and daytime highs peaking at 20°C (68°F), averaging around 6°C (43°F). Precipitation increases significantly, with 47 mm (1.9 in) falling over 8 days and humidity levels rising to 72%. For more detailed insights, check out Tehran weather in November.

September weather in Tehran is characterized by warm temperatures, with averages around 22°C (72°F) and maximums reaching 33°C (91°F). The month experiences very little precipitation, with only 4 mm recorded, and low humidity at around 45%. In contrast, December brings a significant change, with a much colder climate where average temperatures drop to just 1°C (34°F) and can dip as low as -14°C (6°F). Furthermore, December witnesses more frequent precipitation, accumulating to 35 mm over 7 days and higher humidity at 70%. For a detailed insight into the December climate specifics, you can check Tehran weather in December.

Compare Tehran's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Tehran

As summer transitions into autumn, September in Tehran showcases a delightful shift in weather that sets it apart from the scorching heat of the preceding months. With average temperatures hovering comfortably around 22°C (72°F), the intense summer heat gives way to milder days, while the absence of precipitation ensures plenty of sunshine for outdoor activities. The lower humidity levels, typically around 45%, add to the pleasant climate, making this month an ideal time for exploring the city. For more insights into Tehran's climate throughout the year, check out Tehran Climate.