SeasonMapFort-de-France (Martinique) weather in September
Martinique
September in Fort-de-France: sweltering, rainy, with clean air — fine if you can take 24 rainy days.
#11 of 12 months in Fort-de-France · #554 of 1383 destinations to visit in September · comfort 83/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Fort-de-France in September
Other months in Fort-de-France
Martinique's forum describes year-round weather as plenty of sunshine with occasional showers, roughly 25-31°C, and Fort-de-France on the drier southern half of the island compared to the wetter north. Regulars point to the dry-season months around March as generally reliable, with rain a real possibility on any given day but rarely enough to derail a trip.
Add your own note from Fort-de-France's card on the map.
Fort-de-France climate normals — September
| Daytime high | 29°C / 84°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Feels like (high) | 35°C / 95°F | |
| Sea temperature | 30°C / 87°F | ♨️ bath-warm |
| Rainfall | 136 mm / 5.4 in | 🌧 rainy |
| Rainy days | 24 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 12.2 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Fort-de-France in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quietschool holidays in 2 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Fort-de-France's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherFort-de-France's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Fort-de-France in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Sargassum on the Atlantic coast
1 Mar – 30 Sep · usuallySargassum seasonThe windward coast from Le Robert round to Sainte-Anne takes it worst; as it rots the gas corrodes electronics indoors and closes beach restaurants for days. The Caribbean side is usually clear.
- Hazard
Hivernage and hurricane season
1 Jun – 30 NovThe wet half of the year is called hivernage, and the storm risk sits inside it, concentrated between mid-August and early October. Inter-island ferries stop a day or two before a system passes. Source ↗
Nearby, and something's on
Within 300 km of Fort-de-France — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Fort-de-France?
Fort-de-France in September — FAQ
- Is September a good time to visit Fort-de-France?
- September in Fort-de-France: sweltering, rainy, with clean air — fine if you can take 24 rainy days. It ranks #11 of 12 months for Fort-de-France on SeasonMap's comfort score (83/100).
- What is the weather like in Fort-de-France in September?
- In September, Fort-de-France averages a daily high of 29°C and a low of 26.2°C, with about 136.3 mm of rain over roughly 24 rainy days.
- What is the air quality in Fort-de-France in September?
- Fort-de-France has a mean US Air Quality Index of about 34 in September.
Other months in Fort-de-France
Compare Fort-de-France in September
Warmer or cooler than Fort-de-France in September
Similar destinations in Caribbean — September
Within 300 km: Bridgetown's Hawksbill nesting around 1 May – 31 Oct.