Climate averages 1991–2020
Tehran weather
in September.
A hot, very dry month: the 4th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Tehran: daytime highs average 29.9°C and nights cool to about 18.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 4.7 mm of rain on fewer than one day, which makes September a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Tajrīsh (12 km away). In September its highs average 26.7°C, 3.2°C cooler than Tehran, with 4.7 mm of rain.
Among the 128 cities listed in Iran, Tehran ranks joint 66th of 128 for the warmest September highs and joint 100th of 128 for the driest September (rainfall, lowest first). The mean September high of those 128 cities is 31.0°C; Tehran is 1.2°C cooler than that mean.
From September to October, average highs fall by 7.3°C to 22.6°C, and monthly rainfall rises from 4.7 mm to 21 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Tehran climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.3°C-5.3°C | -5.3°C | 42 | 7.6 | 10.010 h |
| February | 7.4°C-3.5°C | -3.5°C | 49 | 8.5 | 10.911 h |
| March | 13.3°C1.6°C | 1.6°C | 62 | 9.5 | 11.912 h |
| April | 20.0°C8.0°C | 8.0°C | 51 | 9.5 | 13.113 h |
| May | 26.6°C14.0°C | 14.0°C | 22 | 5.0 | 14.014 h |
| June | 32.9°C20.4°C | 20.4°C | 5.8 | 1.6 | 14.515 h |
| July | 35.6°C24.5°C | 24.5°C | 4.6 | 1.2 | 14.314 h |
| August | 34.6°C23.4°C | 23.4°C | 4.2 | 0.8 | 13.514 h |
| September, selected | 29.9°C18.6°C | 18.6°C | 4.7 | 0.9 | 12.412 h |
| October | 22.6°C12.0°C | 12.0°C | 21 | 4.1 | 11.311 h |
| November | 13.4°C3.8°C | 3.8°C | 45 | 7.1 | 10.310 h |
| December | 7.6°C-2.2°C | -2.2°C | 43 | 7.5 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Tajrīsh in SeptemberIran · 12 kmHigh 26.7°C · Low 17.8°C · 4.7 mm rain
- Eslamshahr in SeptemberIran · 23 kmHigh 31.5°C · Low 17.3°C · 1.4 mm rain
- Bāghestān in SeptemberIran · 27 kmHigh 31.2°C · Low 16.6°C · 2.5 mm rain
- Golestān in SeptemberIran · 29 kmHigh 31.7°C · Low 17.4°C · 1.4 mm rain
- Qarchak in SeptemberIran · 33 kmHigh 32.2°C · Low 18.2°C · 1.2 mm rain
- Shahrīār in SeptemberIran · 33 kmHigh 30.3°C · Low 16.3°C · 1.6 mm rain
- Pākdasht in SeptemberIran · 34 kmHigh 31.2°C · Low 18.6°C · 1.3 mm rain
- Pardīs in SeptemberIran · 36 kmHigh 24.6°C · Low 15.6°C · 5.7 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Tehran) is explained once on the Tehran year overview and on the Sources, method and limits page.
Tajrīsh lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.