Climate averages 1991–2020
Karaj weather
in August.
A very hot, very dry month: the 2nd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a very hot month in Karaj: daytime highs average 34.0°C and nights cool to about 20.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 1.7 mm of rain on fewer than one day, which makes August a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 31 min on an average August day.
The nearest other city in this atlas is Moḩammad Shahr (10 km away). In August its highs average 34.4°C, about as warm as Karaj, with 1.7 mm of rain.
Among the 128 cities listed in Iran, Karaj ranks joint 75th of 128 for the warmest August highs and joint 75th of 128 for the driest August (rainfall, lowest first). The mean August high of those 128 cities is 35.2°C; Karaj is 1.2°C cooler than that mean.
From August to September, average highs fall by 4.9°C to 29.1°C, and monthly rainfall falls from 1.7 mm to 1.6 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
Karaj climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.2°C-6.2°C | -6.2°C | 37 | 7.0 | 10.010 h |
| February | 7.3°C-4.4°C | -4.4°C | 40 | 7.8 | 10.911 h |
| March | 12.9°C0.2°C | 0.2°C | 48 | 9.0 | 11.912 h |
| April | 19.2°C5.9°C | 5.9°C | 42 | 7.7 | 13.113 h |
| May | 25.6°C11.4°C | 11.4°C | 15 | 3.5 | 14.014 h |
| June | 31.9°C17.2°C | 17.2°C | 2.7 | 0.7 | 14.515 h |
| July | 34.9°C20.8°C | 20.8°C | 1.4 | 0.4 | 14.314 h |
| August, selected | 34.0°C20.2°C | 20.2°C | 1.7 | 0.2 | 13.514 h |
| September | 29.1°C15.4°C | 15.4°C | 1.6 | 0.4 | 12.412 h |
| October | 21.8°C9.3°C | 9.3°C | 14 | 2.8 | 11.311 h |
| November | 12.9°C1.8°C | 1.8°C | 35 | 6.0 | 10.310 h |
| December | 7.5°C-3.3°C | -3.3°C | 37 | 6.9 | 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
- Moḩammad Shahr in AugustIran · 10 kmHigh 34.4°C · Low 19.8°C · 1.7 mm rain
- Kamālshahr in AugustIran · 11 kmHigh 34.0°C · Low 21.6°C · 2.0 mm rain
- Shahre Jadide Andisheh in AugustIran · 17 kmHigh 34.8°C · Low 20.5°C · 1.7 mm rain
- Shahrīār in AugustIran · 20 kmHigh 35.0°C · Low 21.0°C · 1.7 mm rain
- Bāghestān in AugustIran · 24 kmHigh 35.8°C · Low 21.2°C · 2.5 mm rain
- Mehestan in AugustIran · 28 kmHigh 32.1°C · Low 20.1°C · 2.5 mm rain
- Naz̧arābād in AugustIran · 37 kmHigh 34.1°C · Low 20.9°C · 2.8 mm rain
- Eslamshahr in AugustIran · 38 kmHigh 36.1°C · Low 22.1°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 Karaj) is explained once on the Karaj year overview and on the Sources, method and limits page.
Shahrīār, Moḩammad Shahr and Shahre Jadide Andisheh lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.