Climate averages 1991–2020
As Suwayq weather
in September.
A very hot, very dry month: the 5th warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a very hot month in As Suwayq: daytime highs average 37.7°C and nights cool to about 26.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Rain is very rare: less than 1 mm falls in a typical September (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 12 h 18 min on an average September day.
The nearest other city in this atlas is Rustaq (51 km away). In September its highs average 39.0°C, 1.3°C warmer than As Suwayq, with 1.7 mm of rain.
Among the 12 cities listed in Oman, As Suwayq ranks 6th of 12 for the warmest September highs and joint 1st of 12 for the driest September (rainfall, lowest first). The mean September high of those 12 cities is 36.7°C; As Suwayq is 1.0°C warmer than that mean.
From September to October, average highs fall by 2.5°C to 35.2°C, and monthly rainfall stays under 1 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
As Suwayq climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 24.7°C14.9°C | 14.9°C | 7.0 | 1.6 | 10.811 h |
| February | 26.6°C16.6°C | 16.6°C | 4.7 | 1.1 | 11.311 h |
| March | 29.9°C19.2°C | 19.2°C | 7.3 | 1.2 | 12.012 h |
| April | 35.4°C22.9°C | 22.9°C | 2.3 | 0.5 | 12.713 h |
| May | 40.0°C26.5°C | 26.5°C | 0.4 | 0.1 | 13.313 h |
| June | 40.8°C28.5°C | 28.5°C | 2.5 | 0.2 | 13.614 h |
| July | 39.9°C29.0°C | 29.0°C | 3.8 | 0.2 | 13.513 h |
| August | 38.9°C28.1°C | 28.1°C | 0.1 | 0.0 | 13.013 h |
| September, selected | 37.7°C26.4°C | 26.4°C | 0.1 | 0.0 | 12.312 h |
| October | 35.2°C23.6°C | 23.6°C | 0.7 | 0.2 | 11.612 h |
| November | 30.0°C19.8°C | 19.8°C | 4.0 | 0.7 | 11.011 h |
| December | 26.2°C16.6°C | 16.6°C | 5.2 | 0.9 | 10.711 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
- Rustaq in SeptemberOman · 51 kmHigh 39.0°C · Low 28.7°C · 1.7 mm rain
- Şaḩam in SeptemberOman · 66 kmHigh 36.3°C · Low 27.2°C · 0.1 mm rain
- Seeb in SeptemberOman · 79 kmHigh 34.9°C · Low 26.9°C · 0.1 mm rain
- Samā’il in SeptemberOman · 81 kmHigh 38.7°C · Low 27.0°C · 0.4 mm rain
- Sohar in SeptemberOman · 92 kmHigh 36.9°C · Low 27.0°C · 0.4 mm rain
- Nizwá in SeptemberOman · 102 kmHigh 38.0°C · Low 25.8°C · 2.3 mm rain
- Muscat in SeptemberOman · 103 kmHigh 34.6°C · Low 26.7°C · 0.2 mm rain
- ‘Ibrī in SeptemberOman · 117 kmHigh 39.4°C · Low 25.1°C · 0.7 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 As Suwayq) is explained once on the As Suwayq year overview and on the Sources, method and limits page.