Climate averages 1991–2020
Chālūs weather
in September.
A warm, wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Chālūs: daytime highs average 24.2°C and nights cool to about 21.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 148 mm of rain on roughly 15 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average September day.
The nearest other city in this atlas is Āmol (86 km away). In September its highs average 24.8°C, 0.6°C warmer than Chālūs, with 167 mm of rain.
Among the 128 cities listed in Iran, Chālūs ranks 125th of 128 for the warmest September highs and 124th of 128 for the driest September (rainfall, lowest first). The mean September high of those 128 cities is 31.0°C; Chālūs is 6.8°C cooler than that mean.
From September to October, average highs fall by 3.2°C to 21.0°C, and monthly rainfall rises from 148 mm to 205 mm.
The annual picture
September 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 | 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, selected | 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
September in nearby cities
- Āmol in SeptemberIran · 86 kmHigh 24.8°C · Low 18.8°C · 167 mm rain
- Tajrīsh in SeptemberIran · 95 kmHigh 26.7°C · Low 17.8°C · 4.7 mm rain
- Mehestan in SeptemberIran · 96 kmHigh 27.2°C · Low 16.0°C · 2.0 mm rain
- Karaj in SeptemberIran · 99 kmHigh 29.1°C · Low 15.4°C · 1.6 mm rain
- Kamālshahr in SeptemberIran · 101 kmHigh 29.2°C · Low 17.0°C · 1.7 mm rain
- Naz̧arābād in SeptemberIran · 107 kmHigh 29.1°C · Low 16.9°C · 2.5 mm rain
- Tehran in SeptemberIran · 107 kmHigh 29.9°C · Low 18.6°C · 4.7 mm rain
- Pardīs in SeptemberIran · 107 kmHigh 24.6°C · Low 15.6°C · 5.7 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 Chālūs) is explained once on the Chālūs year overview and on the Sources, method and limits page.