Riyadh weather in September
In September, Riyadh has an average high of 40 °C104 °F and an average low of 25 °C76 °F, with about 0 mm0.0 in of precipitation. It is the 4th warmest month of the year and the driest.
How September compares with other months
Compared with August, September is 3.3 °C6 °F cooler on average. Compared with October, September is 5.3 °C9.5 °F warmer on average. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 15% and the average cloud amount 15%.
Is September a good time to visit Riyadh?
September is not among the most comfortable months by our comfort score: it is hot (average high 40 °C104 °F). The most comfortable months in Riyadh are November–March.
What to wear in September
For Riyadh in September, pack very light, breathable clothing, a sun hat and plenty of water.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Riyadh | 40104 | 2576 | 00.0 |
| Al Kharj | 41106 | 2578 | 00.0 |
| Az Zulfi | 40104 | 2475 | 00.0 |
| Al Hufuf | 42108 | 2679 | 00.0 |
| Unaizah | 40105 | 2475 | 00.0 |
| Buraydah | 41105 | 2475 | 00.0 |
| Al Jubayl | 40104 | 2882 | 00.0 |
| Dammam | 39103 | 2883 | 00.0 |
| Hafar Al-Batin | 41106 | 2578 | 00.0 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Al Hufuf, Al Jubayl and Dammam.
Other months in Riyadh
- January21 °C70 °F / 7 °C44 °F
- February24 °C76 °F / 9 °C48 °F
- March29 °C84 °F / 13 °C56 °F
- April34 °C94 °F / 19 °C66 °F
- May40 °C104 °F / 24 °C75 °F
- June43 °C109 °F / 26 °C79 °F
- July44 °C111 °F / 28 °C82 °F
- August44 °C110 °F / 28 °C82 °F
- September40 °C104 °F / 25 °C76 °F
- October35 °C94 °F / 20 °C67 °F
- November27 °C81 °F / 14 °C57 °F
- December22 °C71 °F / 8 °C47 °F
Frequently asked questions
How warm is Riyadh in September?
In September the average high in Riyadh is 40 °C (104 °F) and the average low is 25 °C (76 °F).
Does it rain a lot in Riyadh in September?
On average about 0 mm (0.0 in) of precipitation falls in September; it ranks 12th of the 12 months.
Is September the warmest month in Riyadh?
No. The warmest month in Riyadh is July, with an average high of 44 °C (111 °F). The coldest month is January, with an average low of 7 °C (44 °F).
How long is the day in Riyadh in September?
In the middle of September the day in Riyadh lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Riyadh in September?
The average relative humidity in September is about 15%. This is a long-term average for the whole day.
How cloudy is Riyadh in September?
On average about 15% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.