Monaco weather in September
September in Monaco: warm, a little rain — one of the best months to visit.
#2 of 12 months in Monaco · #171 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Monaco climate normals — September
| Daytime high | 25°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 65°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 46 mm / 1.8 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 17°C / 62°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.5 h | |
| Wind | 12 km/h / 7 mph | |
| Air quality (US AQI) | 55 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Monaco in September — FAQ
- Is September a good time to visit Monaco?
- September in Monaco: warm, a little rain — one of the best months to visit. It ranks #2 of 12 months for Monaco on SeasonMap's comfort score (86/100).
- What is the weather like in Monaco in September?
- In September, Monaco averages a daily high of 24.7°C and a low of 18.6°C, with about 46.2 mm of rain over roughly 9.2 rainy days.
- What is the air quality in Monaco in September?
- Monaco has a mean US Air Quality Index of about 55 in September.