Climate averages 1991–2020
Būmahen weather
in September.
A warm, very dry month: the 4th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Būmahen: daytime highs average 25.7°C and nights cool to about 17.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 5.7 mm of rain on roughly 1 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 Pardīs (5 km away). In September its highs average 24.6°C, 1.1°C cooler than Būmahen, with 5.7 mm of rain.
Among the 128 cities listed in Iran, Būmahen ranks 116th of 128 for the warmest September highs and joint 103rd of 128 for the driest September (rainfall, lowest first). The mean September high of those 128 cities is 31.0°C; Būmahen is 5.3°C cooler than that mean.
From September to October, average highs fall by 7.1°C to 18.6°C, and monthly rainfall rises from 5.7 mm to 20 mm.
The annual picture
September in context
Monthly precipitation
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
Būmahen climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.8°C-6.0°C | -6.0°C | 36 | 6.7 | 10.010 h |
| February | 3.5°C-4.5°C | -4.5°C | 44 | 8.1 | 10.911 h |
| March | 8.8°C0.3°C | 0.3°C | 59 | 9.6 | 11.912 h |
| April | 15.7°C6.6°C | 6.6°C | 50 | 9.7 | 13.113 h |
| May | 22.2°C12.6°C | 12.6°C | 24 | 5.1 | 14.014 h |
| June | 28.5°C18.0°C | 18.0°C | 6.7 | 1.8 | 14.515 h |
| July | 31.4°C21.5°C | 21.5°C | 5.2 | 1.3 | 14.314 h |
| August | 30.3°C20.8°C | 20.8°C | 5.0 | 1.1 | 13.514 h |
| September, selected | 25.7°C17.1°C | 17.1°C | 5.7 | 1.3 | 12.412 h |
| October | 18.6°C11.0°C | 11.0°C | 20 | 3.9 | 11.311 h |
| November | 9.8°C2.7°C | 2.7°C | 40 | 6.8 | 10.310 h |
| December | 4.3°C-3.1°C | -3.1°C | 36 | 7.0 | 9.810 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Pardīs in SeptemberIran · 5 kmHigh 24.6°C · Low 15.6°C · 5.7 mm rain
- Pākdasht in SeptemberIran · 33 kmHigh 31.2°C · Low 18.6°C · 1.3 mm rain
- Tehran in SeptemberIran · 41 kmHigh 29.9°C · Low 18.6°C · 4.7 mm rain
- Tajrīsh in SeptemberIran · 41 kmHigh 26.7°C · Low 17.8°C · 4.7 mm rain
- Qarchak in SeptemberIran · 43 kmHigh 32.2°C · Low 18.2°C · 1.2 mm rain
- Varāmīn in SeptemberIran · 49 kmHigh 33.0°C · Low 18.5°C · 0.8 mm rain
- Eslamshahr in SeptemberIran · 61 kmHigh 31.5°C · Low 17.3°C · 1.4 mm rain
- Golestān in SeptemberIran · 66 kmHigh 31.7°C · Low 17.4°C · 1.4 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 Būmahen) is explained once on the Būmahen year overview and on the Sources, method and limits page.
Pardīs lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.