Climate averages 1991–2020
Ar Rass weather
in September.
A very hot, very dry month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a very hot month in Ar Rass: daytime highs average 39.4°C and nights cool to about 23.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Rain is very rare: less than 1 mm falls in a typical September (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 20 min on an average September day.
The nearest other city in this atlas is Unaizah (56 km away). In September its highs average 39.2°C, about as warm as Ar Rass, with almost no rain (under 1 mm).
Among the 35 cities listed in Saudi Arabia, Ar Rass ranks joint 6th of 35 for the warmest September highs and joint 13th of 35 for the driest September (rainfall, lowest first). The mean September high of those 35 cities is 36.0°C; Ar Rass is 3.4°C warmer than that mean.
From September to October, average highs fall by 5.5°C to 33.9°C, and monthly rainfall rises from under 1 mm to 2.7 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
Ar Rass climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.3°C6.3°C | 6.3°C | 13 | 2.4 | 10.711 h |
| February | 22.6°C8.1°C | 8.1°C | 5.9 | 1.1 | 11.311 h |
| March | 26.8°C12.2°C | 12.2°C | 14 | 2.2 | 12.012 h |
| April | 32.3°C17.3°C | 17.3°C | 13 | 2.7 | 12.813 h |
| May | 37.7°C22.1°C | 22.1°C | 1.7 | 0.4 | 13.413 h |
| June | 40.8°C24.1°C | 24.1°C | 0 | 0.0 | 13.714 h |
| July | 41.7°C25.0°C | 25.0°C | 0 | 0.0 | 13.614 h |
| August | 42.1°C25.5°C | 25.5°C | 0 | 0.0 | 13.013 h |
| September, selected | 39.4°C23.0°C | 23.0°C | 0.1 | 0.1 | 12.312 h |
| October | 33.9°C18.4°C | 18.4°C | 2.7 | 0.4 | 11.612 h |
| November | 25.8°C12.8°C | 12.8°C | 20 | 3.0 | 10.911 h |
| December | 20.7°C8.0°C | 8.0°C | 12 | 2.3 | 10.611 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
- Unaizah in SeptemberSaudi Arabia · 56 kmHigh 39.2°C · Low 23.2°C · 0.1 mm rain
- Buraydah in SeptemberSaudi Arabia · 70 kmHigh 39.8°C · Low 23.4°C · 0.1 mm rain
- Az Zulfī in SeptemberSaudi Arabia · 140 kmHigh 39.4°C · Low 24.0°C · 0 mm rain
- Ad Dawādimī in SeptemberSaudi Arabia · 176 kmHigh 37.5°C · Low 23.5°C · 0 mm rain
- Ha'il in SeptemberSaudi Arabia · 257 kmHigh 37.1°C · Low 22.6°C · 0.1 mm rain
- Riyadh in SeptemberSaudi Arabia · 350 kmHigh 39.4°C · Low 24.2°C · 0 mm rain
- Hafar Al-Batin in SeptemberSaudi Arabia · 376 kmHigh 40.5°C · Low 24.2°C · 0 mm rain
- Madinah in SeptemberSaudi Arabia · 421 kmHigh 40.9°C · Low 25.0°C · 0.3 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 Ar Rass) is explained once on the Ar Rass year overview and on the Sources, method and limits page.