Saint-Denis weather in September
September in Saint-Denis: warm, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Saint-Denis · #102 of 604 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Saint-Denis climate normals — September
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 20°C / 68°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 34 mm / 1.3 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 17°C / 63°F | |
| Sunshine | 11.1 h/day | |
| Daylight | 12 h | |
| Wind | 12 km/h / 7 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Saint-Denis in September — FAQ
- Is September a good time to visit Saint-Denis?
- September in Saint-Denis: warm, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Saint-Denis on SeasonMap's comfort score (89/100).
- What is the weather like in Saint-Denis in September?
- In September, Saint-Denis averages a daily high of 24.8°C and a low of 20°C, with about 34.2 mm of rain over roughly 10.8 rainy days.
- What is the air quality in Saint-Denis in September?
- Saint-Denis has a mean US Air Quality Index of about 43 in September.