Fort-de-France weather in September

In September, Fort-de-France sees average daytime highs of 28°C and overnight lows near 26°C, with 138 mm of rain across 19.3 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Fort-de-France's 12th-clearest and 12th-windiest month. For the whole year in context, see Fort-de-France's year-round climate.

Daytime high
28°
1st warmest
Overnight low
26°
12th coldest
Rainfall
138 mm
19.3 wet days
Daylight
12 h 06 min
5:56 AM – 6:01 PM
Cloud cover
60%
12th clearest
Wind
20 km/h
12th windiest
Solar energy
5.96 kWh/m²
Travel score
5.0
out of 10

Fort-de-France is French commune; largest and capital city of Martinique.

Density
2,036/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Fort-de-France reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 28°C. Set against its neighbours, September runs on par with August and on par with October.

24°26°28°30°32°151015202530
Avg high (°C)Avg low (°C)
12826
22826
32826
42826
52826
62826
72826
82826
92826
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826

Fort-de-France weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 24°4114.511.26.6
Feb25° / 24°2510.111.57.1
Mar26° / 24°269.711.97.3
Apr26° / 25°3811.212.36.7
May27° / 25°5814.112.76.1
Jun27° / 26°8316.612.85.4
Jul27° / 26°11321.112.85.1
Aug28° / 26°13322.112.54.9
Sep28° / 26°13819.312.15.0
Oct28° / 26°14821.511.74.8
Nov27° / 26°12719.511.35.2
Dec26° / 25°5414.911.26.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 53%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35545
45446
55446
65347
75248
85149
95149
105050
114951
124951
134654
144555
154555
164555
174555
184456
194456
204456
214357
224357
234357
244357
254357
264258
274456
284456
294357
304555

Chance of precipitation in September

Any precipitation

Fort-de-France gets around 138 mm of rain over 19.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 65% and peaks near 71% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
162
261
361
461
561
661
761
861
961
1062
1162
1263
1363
1463
1564
1664
1765
1865
1966
2066
2167
2267
2368
2468
2568
2669
2770
2870
2971
3071

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 65% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16535
26535
36436
46436
56337
66337
76337
86238
96238
106238
116238
126238
136337
146337
156337
166436
176436
186535
196634
206634
216733
226733
236832
246832
256832
266931
276931
286931
296931
306931

Wind in September

Winds average 20 km/h in September, the calmest month.

Across September, daily wind ranges from about 20 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
121breezy
220breezy
320breezy
420breezy
520breezy
620breezy
720breezy
820breezy
920breezy
1020breezy
1120breezy
1220breezy
1320breezy
1420breezy
1520breezy
1620breezy
1720breezy
1820breezy
1920breezy
2020breezy
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620breezy
2720breezy
2820breezy
2920breezy
3020breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 5:55 AM to 5:57 AM, and sunset from 6:13 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:556:13
212.35:556:12
312.35:566:11
412.25:566:10
512.25:566:10
612.25:566:09
712.25:566:08
812.25:566:07
912.25:566:07
1012.25:566:06
1112.25:566:05
1212.15:566:04
1312.15:566:03
1412.15:566:03
1512.15:566:02
1612.15:566:01
1712.15:566:00
1812.15:565:59
1912.05:565:59
2012.05:565:58
2112.05:565:57
2212.05:575:56
2312.05:575:56
2412.05:575:55
2512.05:575:54
2611.95:575:53
2711.95:575:52
2811.95:575:52
2911.95:575:51
3011.95:575:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.96 kWh/m².

For context, solar energy here swings from a low near 4.9 kWh/m² to a high of 6.67 kWh/m² in April across the year — September's 5.96 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.1Intense
106.0Intense
116.0Intense
126.0Intense
136.0Intense
146.0Bright
156.0Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
205.9Bright
215.9Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for Fort-de-France

In seasonPeak

In September, Fort-de-France sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

Fort-de-France sits in the Atlantic hurricane belt; the season peaks August–October.

Fort-de-France's rainy season runs June–November, when most of the year's rain falls.

Fort-de-France sees seasonal dust haze (June–July), heaviest in June.

Atlantic hurricane
Rainy season
Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Fort-de-France?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.0
Sightseeing
10th-best month of the year
5.3
Beach & pool
9th-best month of the year

September is a reasonable time to visit Fort-de-France for sightseeing.

What to pack for Fort-de-France in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Fort-de-France sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection and a windbreaker. About 19 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Fort-de-France in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in September at about 29°C and coldest in February near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr27Warm
May28Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec28Warm

UV index in Fort-de-France in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fort-de-France peaks around March 22 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMar 22UV 14Dec 13UV 8
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun11Extreme
Jul12Extreme
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Fort-de-France in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Fort-de-France is worst in June — around 29 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (December, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1929 µg/m³Dec 2310 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb14Moderate
Mar12Good
Apr16Moderate
May19Moderate
Jun29Moderate
Jul25Moderate
Aug21Moderate
Sep15Moderate
Oct18Moderate
Nov13Moderate
Dec10Good
Location & terrain

Where is Fort-de-France?

Fort-de-France sits at 14.6°N, 61.1°W, 5 m above sea level, in Martinique. The nearest listed city is Le Lamentin, 8.0 km away.

Le LamentinSaint-JosephDucosLe RobertLe FrançoisLa TrinitéSainte-Marie

Topography around Fort-de-France

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Fort-de-France.

Within 3 km, the terrain around Fort-de-France has only modest variations in elevation — a maximum elevation change of 198 m around an average of 34 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,188 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,370 m.

The land around Fort-de-France is covered by water (44%) and artificial surfaces (37%) within 3 km, trees (48%) and water (39%) within 16 km, and water (89%) within 80 km.

3 km
198 m
16 km
1,188 m
80 km
1,370 m
treesgrasslandartificial surfaceswatermangroves
September weather nearby: Le Lamentin 8.0 km · Saint-Joseph 8.0 km · Ducos 11 km · Le Robert 16 km · Le François 18 km · La Trinité 19 km · Sainte-Marie 22 km · Gros Islet 61 km

Martinique travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
220 V · 50 Hz

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Fort-de-France (14.6037°, -61.0742°, elevation 5 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).