Climate averages 1991–2020
Chālūs weather
in May.
A mild, moderately wet month: the 6th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Chālūs: daytime highs average 20.9°C and nights cool to about 16.7°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 48 mm of rain on roughly 10 days, which makes May a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 06 min on an average May day.
The nearest other city in this atlas is Āmol (86 km away). In May its highs average 21.8°C, 0.8°C warmer than Chālūs, with 80 mm of rain.
Among the 128 cities listed in Iran, Chālūs ranks 124th of 128 for the warmest May highs and 114th of 128 for the driest May (rainfall, lowest first). The mean May high of those 128 cities is 27.8°C; Chālūs is 6.9°C cooler than that mean.
From May to June, average highs rise by 3.4°C to 24.3°C, and monthly rainfall rises from 48 mm to 49 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
Chālūs climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.6°C7.1°C | 7.1°C | 142 | 15.3 | 10.010 h |
| February | 10.4°C6.5°C | 6.5°C | 125 | 14.4 | 10.811 h |
| March | 12.8°C8.3°C | 8.3°C | 100 | 14.1 | 11.912 h |
| April | 16.6°C11.8°C | 11.8°C | 68 | 11.4 | 13.113 h |
| May, selected | 20.9°C16.7°C | 16.7°C | 48 | 10.0 | 14.114 h |
| June | 24.3°C20.8°C | 20.8°C | 49 | 8.9 | 14.615 h |
| July | 26.2°C23.0°C | 23.0°C | 59 | 10.8 | 14.414 h |
| August | 26.9°C23.7°C | 23.7°C | 60 | 11.3 | 13.614 h |
| September | 24.2°C21.1°C | 21.1°C | 148 | 14.6 | 12.412 h |
| October | 21.0°C17.6°C | 17.6°C | 205 | 15.4 | 11.311 h |
| November | 16.0°C12.7°C | 12.7°C | 218 | 15.8 | 10.310 h |
| December | 12.6°C9.2°C | 9.2°C | 156 | 14.6 | 9.710 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
- Āmol in MayIran · 86 kmHigh 21.8°C · Low 14.5°C · 80 mm rain
- Tajrīsh in MayIran · 95 kmHigh 22.9°C · Low 12.5°C · 22 mm rain
- Mehestan in MayIran · 96 kmHigh 23.1°C · Low 11.8°C · 19 mm rain
- Karaj in MayIran · 99 kmHigh 25.6°C · Low 11.4°C · 15 mm rain
- Kamālshahr in MayIran · 101 kmHigh 25.3°C · Low 12.5°C · 17 mm rain
- Naz̧arābād in MayIran · 107 kmHigh 25.2°C · Low 13.1°C · 24 mm rain
- Tehran in MayIran · 107 kmHigh 26.6°C · Low 14.0°C · 22 mm rain
- Pardīs in MayIran · 107 kmHigh 21.3°C · Low 11.2°C · 24 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 Chālūs) is explained once on the Chālūs year overview and on the Sources, method and limits page.