Climate averages 1991–2020
Karaj weather
in July.
A very hot, very dry month: the warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a very hot month in Karaj: daytime highs average 34.9°C and nights cool to about 20.8°C. By daytime temperature it is the warmest month of the year.
Expect about 1.4 mm of rain on fewer than one day, which makes July a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 20 min on an average July day.
The nearest other city in this atlas is Moḩammad Shahr (10 km away). In July its highs average 35.3°C, about as warm as Karaj, with 1.4 mm of rain.
Among the 128 cities listed in Iran, Karaj ranks joint 70th of 128 for the warmest July highs and joint 69th of 128 for the driest July (rainfall, lowest first). The mean July high of those 128 cities is 35.7°C; Karaj is 0.8°C cooler than that mean.
From July to August, average highs fall by 0.9°C to 34.0°C, and monthly rainfall rises from 1.4 mm to 1.7 mm.
The annual picture
July 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, selected | 34.9°C20.8°C | 20.8°C | 1.4 | 0.4 | 14.314 h |
| August | 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
July in nearby cities
- Moḩammad Shahr in JulyIran · 10 kmHigh 35.3°C · Low 20.5°C · 1.4 mm rain
- Kamālshahr in JulyIran · 11 kmHigh 34.8°C · Low 21.9°C · 1.7 mm rain
- Shahre Jadide Andisheh in JulyIran · 17 kmHigh 35.7°C · Low 21.3°C · 1.4 mm rain
- Shahrīār in JulyIran · 20 kmHigh 35.9°C · Low 21.9°C · 1.4 mm rain
- Bāghestān in JulyIran · 24 kmHigh 36.8°C · Low 22.3°C · 2.7 mm rain
- Mehestan in JulyIran · 28 kmHigh 32.9°C · Low 20.3°C · 2.3 mm rain
- Naz̧arābād in JulyIran · 37 kmHigh 34.8°C · Low 21.1°C · 2.9 mm rain
- Eslamshahr in JulyIran · 38 kmHigh 37.1°C · Low 23.3°C · 1.7 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 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.