Port Louis weather in September
September in Port Louis: warm, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Port Louis · #178 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Port Louis climate normals — September
| Daytime high | 26°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 25°C / 77°F | |
| Rainfall | 32 mm / 1.3 in | 🌦 some rain |
| Rainy days | 13 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 11 h/day | |
| Daylight | 12 h | |
| Wind | 29 km/h / 18 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Port Louis in September — FAQ
- Is September a good time to visit Port Louis?
- September in Port Louis: warm, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Port Louis on SeasonMap's comfort score (86/100).
- What is the weather like in Port Louis in September?
- In September, Port Louis averages a daily high of 25.5°C and a low of 20.7°C, with about 31.9 mm of rain over roughly 12.8 rainy days.
- What is the air quality in Port Louis in September?
- Port Louis has a mean US Air Quality Index of about 38 in September.