Tehran weather in September
In September, Tehran has an average high of 31 °C89 °F and an average low of 18 °C65 °F, with about 16 mm0.6 in of precipitation. It is the 4th warmest month of the year and ranks 8th for precipitation.
How September compares with other months
Compared with August, September is 4.4 °C7.9 °F cooler on average and wetter by 7 mm0.3 in. Compared with October, September is 6.6 °C11.9 °F warmer on average and drier by 21 mm0.8 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 28% and the average cloud amount 25%.
Is September a good time to visit Tehran?
September is not among the most comfortable months by our comfort score: it is hot (average high 31 °C89 °F). The most comfortable months in Tehran are April and May and October.
What to wear in September
For Tehran in September, pack very light, breathable clothing, a sun hat and plenty of water.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Tehran | 3189 | 1865 | 160.6 |
| Qarchak | 3290 | 2067 | 220.9 |
| Karaj | 2883 | 1661 | 441.7 |
| Nazarabad | 3187 | 1762 | 281.1 |
| Chalus | 3391 | 2374 | 903.6 |
| Amol | 3087 | 2272 | 662.6 |
| Saveh | 3493 | 1865 | 20.1 |
| Qom | 3595 | 1966 | 10.0 |
| Qazvin | 2882 | 1355 | 562.2 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Qarchak, Chalus, Amol and Saveh; cooler: Karaj, Nazarabad and Qazvin.
Other months in Tehran
- January8 °C47 °F / −2 °C29 °F
- February11 °C52 °F / 0 °C32 °F
- March17 °C63 °F / 4 °C40 °F
- April22 °C72 °F / 9 °C48 °F
- May29 °C85 °F / 15 °C59 °F
- June35 °C96 °F / 20 °C69 °F
- July38 °C100 °F / 23 °C74 °F
- August36 °C97 °F / 22 °C72 °F
- September31 °C89 °F / 18 °C65 °F
- October24 °C76 °F / 12 °C54 °F
- November15 °C59 °F / 4 °C40 °F
- December10 °C50 °F / 0 °C32 °F
Frequently asked questions
How warm is Tehran in September?
In September the average high in Tehran is 31 °C (89 °F) and the average low is 18 °C (65 °F).
Does it rain a lot in Tehran in September?
On average about 16 mm (0.6 in) of precipitation falls in September; it ranks 8th of the 12 months.
Is September the warmest month in Tehran?
No. The warmest month in Tehran is July, with an average high of 38 °C (100 °F). The coldest month is January, with an average low of -2 °C (29 °F).
How long is the day in Tehran in September?
In the middle of September the day in Tehran lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Tehran in September?
The average relative humidity in September is about 28%. This is a long-term average for the whole day.
How cloudy is Tehran in September?
On average about 25% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.