Climate averages 1991–2020
Karaj weather
in May.
A warm, fairly dry month: the 5th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Karaj: daytime highs average 25.6°C and nights cool to about 11.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 15 mm of rain on roughly 4 days, which makes May a fairly dry month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 02 min on an average May day.
The nearest other city in this atlas is Moḩammad Shahr (10 km away). In May its highs average 26.0°C, about as warm as Karaj, with 15 mm of rain.
Among the 128 cities listed in Iran, Karaj ranks 71st of 128 for the warmest May highs and joint 54th of 128 for the driest May (rainfall, lowest first). The mean May high of those 128 cities is 27.8°C; Karaj is 2.2°C cooler than that mean.
From May to June, average highs rise by 6.2°C to 31.9°C, and monthly rainfall falls from 15 mm to 2.7 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Moḩammad Shahr in MayIran · 10 kmHigh 26.0°C · Low 11.5°C · 15 mm rain
- Kamālshahr in MayIran · 11 kmHigh 25.3°C · Low 12.5°C · 17 mm rain
- Shahre Jadide Andisheh in MayIran · 17 kmHigh 26.6°C · Low 12.2°C · 15 mm rain
- Shahrīār in MayIran · 20 kmHigh 26.8°C · Low 12.5°C · 15 mm rain
- Bāghestān in MayIran · 24 kmHigh 27.7°C · Low 13.2°C · 18 mm rain
- Mehestan in MayIran · 28 kmHigh 23.1°C · Low 11.8°C · 19 mm rain
- Naz̧arābād in MayIran · 37 kmHigh 25.2°C · Low 13.1°C · 24 mm rain
- Eslamshahr in MayIran · 38 kmHigh 28.2°C · Low 13.9°C · 16 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.