Climate averages 1991–2020
Semnan weather
in August.
A very hot, very dry month: the 2nd warmest and the joint 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a very hot month in Semnan: daytime highs average 34.3°C and nights cool to about 21.7°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 1.2 mm of rain on fewer than one day, which makes August a very dry month (the joint 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 30 min on an average August day.
The nearest other city in this atlas is Qā’em Shahr (110 km away). In August its highs average 30.8°C, 3.5°C cooler than Semnan, with 52 mm of rain.
Among the 128 cities listed in Iran, Semnan ranks 71st of 128 for the warmest August highs and joint 63rd of 128 for the driest August (rainfall, lowest first). The mean August high of those 128 cities is 35.2°C; Semnan is 0.9°C cooler than that mean.
From August to September, average highs fall by 4.5°C to 29.8°C, and monthly rainfall rises from 1.2 mm to 1.7 mm.
The annual picture
August 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
Semnan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.1°C-1.0°C | -1.0°C | 12 | 3.3 | 10.010 h |
| February | 9.6°C0.4°C | 0.4°C | 14 | 3.1 | 10.911 h |
| March | 15.3°C4.7°C | 4.7°C | 18 | 3.9 | 11.912 h |
| April | 21.9°C10.4°C | 10.4°C | 13 | 2.8 | 13.113 h |
| May | 27.7°C15.2°C | 15.2°C | 4.8 | 1.3 | 14.014 h |
| June | 32.8°C19.5°C | 19.5°C | 1.2 | 0.3 | 14.515 h |
| July | 35.3°C22.4°C | 22.4°C | 1.0 | 0.3 | 14.314 h |
| August, selected | 34.3°C21.7°C | 21.7°C | 1.2 | 0.3 | 13.514 h |
| September | 29.8°C18.0°C | 18.0°C | 1.7 | 0.5 | 12.412 h |
| October | 22.8°C12.5°C | 12.5°C | 4.5 | 1.2 | 11.311 h |
| November | 13.9°C5.8°C | 5.8°C | 11 | 3.1 | 10.310 h |
| December | 8.4°C1.2°C | 1.2°C | 10 | 3.2 | 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
August in nearby cities
- Qā’em Shahr in AugustIran · 110 kmHigh 30.8°C · Low 21.5°C · 52 mm rain
- Sari in AugustIran · 114 kmHigh 31.9°C · Low 22.0°C · 61 mm rain
- Behshahr in AugustIran · 125 kmHigh 32.2°C · Low 23.8°C · 22 mm rain
- Bābol in AugustIran · 126 kmHigh 30.9°C · Low 22.9°C · 52 mm rain
- Āmol in AugustIran · 136 kmHigh 27.5°C · Low 21.5°C · 79 mm rain
- Būmahen in AugustIran · 139 kmHigh 30.3°C · Low 20.8°C · 5.0 mm rain
- Pardīs in AugustIran · 144 kmHigh 29.3°C · Low 19.6°C · 5.0 mm rain
- Pākdasht in AugustIran · 155 kmHigh 36.0°C · Low 23.4°C · 1.6 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 Semnan) is explained once on the Semnan year overview and on the Sources, method and limits page.