Climate averages 1991–2020
Fort-de-France weather
in September.
A hot, wet month: the warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Fort-de-France: daytime highs average 29.0°C and nights cool to about 26.2°C. By daytime temperature it is the warmest month of the year.
Expect about 138 mm of rain on roughly 19 days, which makes September a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 13 min on an average September day.
The nearest other city in this atlas is Castries (68 km away). In September its highs average 29.1°C, about as warm as Fort-de-France, with 104 mm of rain.
From September to October, average highs fall by 0.4°C to 28.6°C, and monthly rainfall rises from 138 mm to 148 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
Fort-de-France climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.8°C24.3°C | 24.3°C | 41 | 14.5 | 11.411 h |
| February | 27.0°C24.1°C | 24.1°C | 25 | 10.1 | 11.712 h |
| March | 27.5°C24.3°C | 24.3°C | 26 | 9.7 | 12.012 h |
| April | 28.1°C24.9°C | 24.9°C | 38 | 11.2 | 12.512 h |
| May | 28.7°C25.6°C | 25.6°C | 58 | 14.1 | 12.813 h |
| June | 28.8°C25.9°C | 25.9°C | 83 | 16.6 | 13.013 h |
| July | 28.7°C25.8°C | 25.8°C | 113 | 21.1 | 12.913 h |
| August | 28.9°C26.0°C | 26.0°C | 133 | 22.1 | 12.613 h |
| September, selected | 29.0°C26.2°C | 26.2°C | 138 | 19.3 | 12.212 h |
| October | 28.6°C25.9°C | 25.9°C | 148 | 21.5 | 11.812 h |
| November | 27.9°C25.5°C | 25.5°C | 127 | 19.5 | 11.511 h |
| December | 27.3°C24.9°C | 24.9°C | 54 | 14.9 | 11.311 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
- Castries in SeptemberSaint Lucia · 68 kmHigh 29.1°C · Low 25.2°C · 104 mm rain
- Roseau in SeptemberDominica · 85 kmHigh 28.3°C · Low 26.2°C · 113 mm rain
- Kingstown in SeptemberSaint Vincent and the Grenadines · 162 kmHigh 28.7°C · Low 26.6°C · 141 mm rain
- Basse-Terre in SeptemberGuadeloupe · 170 kmHigh 30.0°C · Low 26.7°C · 107 mm rain
- Bridgetown in SeptemberBarbados · 229 kmHigh 28.5°C · Low 26.2°C · 133 mm rain
- Saint John’s in SeptemberAntigua and Barbuda · 292 kmHigh 28.7°C · Low 26.2°C · 127 mm rain
- Saint George's in SeptemberGrenada · 293 kmHigh 28.4°C · Low 26.4°C · 143 mm rain
- Basseterre in SeptemberSaint Kitts and Nevis · 347 kmHigh 28.5°C · Low 26.3°C · 118 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 Fort-de-France) is explained once on the Fort-de-France year overview and on the Sources, method and limits page.