Riyadh weather by month
Riyadh runs from about 17°C in January to 38°C in July, with April the wettest month at 18 mm.
warmest month
July
38°C
coolest month
January
17°C
wettest month
April
18 mm
worst air month
May
174 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 17°C | 1 mm | 299 h | 172 |
| February | 17°C | 4 mm | 282 h | 152 |
| March | 21°C | 10 mm | 287 h | 157 |
| April | 26°C | 18 mm | 296 h | 139 |
| May | 32°C | 8 mm | 354 h | 174 |
| June | 37°C | 0 mm | 357 h | 110 |
| July | 38°C | 0 mm | 369 h | 96 |
| August | 37°C | 0 mm | 361 h | 139 |
| September | 34°C | 0 mm | 341 h | 121 |
| October | 28°C | 1 mm | 336 h | 118 |
| November | 24°C | 9 mm | 306 h | 104 |
| December | 18°C | 0 mm | 304 h | 136 |
About 3,892 hours of sun a year. Roughly 5 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.