Climate averages 1991–2020
Ar Rass weather
in May.
A very hot, very dry month: the 5th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a very hot month in Ar Rass: daytime highs average 37.7°C and nights cool to about 22.1°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 1.7 mm of rain on fewer than one day, which makes May a very dry month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 24 min on an average May day.
The nearest other city in this atlas is Unaizah (56 km away). In May its highs average 37.5°C, about as warm as Ar Rass, with 1.7 mm of rain.
Among the 35 cities listed in Saudi Arabia, Ar Rass ranks 8th of 35 for the warmest May highs and joint 16th of 35 for the driest May (rainfall, lowest first). The mean May high of those 35 cities is 34.8°C; Ar Rass is 2.8°C warmer than that mean.
From May to June, average highs rise by 3.1°C to 40.8°C, and monthly rainfall falls from 1.7 mm to under 1 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
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, selected | 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 | 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
May in nearby cities
- Unaizah in MaySaudi Arabia · 56 kmHigh 37.5°C · Low 22.4°C · 1.7 mm rain
- Buraydah in MaySaudi Arabia · 70 kmHigh 38.0°C · Low 22.8°C · 1.6 mm rain
- Az Zulfī in MaySaudi Arabia · 140 kmHigh 37.6°C · Low 23.3°C · 2.3 mm rain
- Ad Dawādimī in MaySaudi Arabia · 176 kmHigh 36.5°C · Low 22.5°C · 2.9 mm rain
- Ha'il in MaySaudi Arabia · 257 kmHigh 34.2°C · Low 19.7°C · 4.3 mm rain
- Riyadh in MaySaudi Arabia · 350 kmHigh 38.6°C · Low 24.1°C · 1.9 mm rain
- Hafar Al-Batin in MaySaudi Arabia · 376 kmHigh 38.5°C · Low 23.3°C · 1.6 mm rain
- Madinah in MaySaudi Arabia · 421 kmHigh 38.7°C · Low 23.3°C · 1.9 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.