Climate averages 1991–2020
Port Louis weather
in September.
A warm, fairly dry month: the 9th warmest and the joint 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Port Louis: daytime highs average 25.4°C and nights cool to about 20.4°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 26 mm of rain on roughly 7 days, which makes September a fairly dry month (the joint 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 58 min on an average September day.
The nearest other city in this atlas is Vacoas (15 km away). In September its highs average 23.3°C, 2.1°C cooler than Port Louis, with 26 mm of rain.
Among the 2 cities listed in Mauritius, Port Louis ranks 1st of 2 for the warmest September highs and joint 1st of 2 for the driest September (rainfall, lowest first). The mean September high of those 2 cities is 24.4°C; Port Louis is 1.1°C warmer than that mean.
From September to October, average highs rise by 1.3°C to 26.8°C, and monthly rainfall stays at 26 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Port Louis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.5°C25.4°C | 25.4°C | 188 | 22.7 | 13.213 h |
| February | 29.5°C25.6°C | 25.6°C | 170 | 22.1 | 12.813 h |
| March | 29.2°C25.3°C | 25.3°C | 139 | 21.6 | 12.212 h |
| April | 28.5°C24.4°C | 24.4°C | 67 | 16.2 | 11.612 h |
| May | 26.9°C22.8°C | 22.8°C | 43 | 11.1 | 11.211 h |
| June | 25.3°C21.2°C | 21.2°C | 21 | 7.1 | 10.911 h |
| July | 24.5°C20.3°C | 20.3°C | 21 | 8.1 | 11.011 h |
| August | 24.6°C20.1°C | 20.1°C | 24 | 7.1 | 11.411 h |
| September, selected | 25.4°C20.4°C | 20.4°C | 26 | 7.2 | 12.012 h |
| October | 26.8°C21.5°C | 21.5°C | 26 | 7.4 | 12.513 h |
| November | 28.1°C22.9°C | 22.9°C | 43 | 10.8 | 13.113 h |
| December | 29.3°C24.5°C | 24.5°C | 97 | 16.9 | 13.313 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Vacoas in SeptemberMauritius · 15 kmHigh 23.3°C · Low 17.8°C · 26 mm rain
- Saint-Denis in SeptemberReunion · 228 kmHigh 24.3°C · Low 19.8°C · 36 mm rain
- Saint-Pierre in SeptemberReunion · 248 kmHigh 25.5°C · Low 19.6°C · 45 mm rain
- Saint-Paul in SeptemberReunion · 250 kmHigh 24.3°C · Low 19.3°C · 26 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Port Louis) is explained once on the Port Louis year overview and on the Sources, method and limits page.
Vacoas lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.