Riyadh weather in September
September in Riyadh: sweltering, dry, with poor air quality — a hit-or-miss time to visit.
#9 of 12 months in Riyadh · #583 of 604 destinations to visit in September · comfort 45/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Riyadh climate normals — September
| Daytime high | 40°C / 104°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 38°C / 100°F | |
| Rainfall | 0 mm / 0 in | ☀️ dry |
| Rainy days | 0 days | |
| Humidity | 15% | 🌵 dry |
| Dew point | 2°C / 35°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 12.3 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 156 | ⚠️ unhealthy |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Riyadh in September — FAQ
- Is September a good time to visit Riyadh?
- September in Riyadh: sweltering, dry, with poor air quality — a hit-or-miss time to visit. It ranks #9 of 12 months for Riyadh on SeasonMap's comfort score (45/100).
- What is the weather like in Riyadh in September?
- In September, Riyadh averages a daily high of 40°C and a low of 25°C, with about 0 mm of rain over roughly 0 rainy days.
- What is the air quality in Riyadh in September?
- Riyadh has a mean US Air Quality Index of about 156 in September.