Soufriere weather in September

In September, Soufriere sees average daytime highs of 29°C and overnight lows near 26°C, with 117 mm of rain across 19.4 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 31% 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 Soufriere's 11th-clearest and 12th-windiest month. For the whole year in context, see Soufriere's year-round climate.

Daytime high
29°
1st warmest
Overnight low
26°
12th coldest
Rainfall
117 mm
19.4 wet days
Daylight
12 h 06 min
5:56 AM – 6:01 PM
Cloud cover
63%
11th clearest
Wind
17 km/h
12th windiest
Solar energy
5.92 kWh/m²
Travel score
4.2
out of 10

Soufriere is town in Saint Lucia.

Founded
1750

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 29°C through the month.

A typical September day in Soufriere reaches about 29°C in the afternoon and slips back to 26°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 30°C. Set against its neighbours, September runs on par with August and on par with October.

25°28°30°33°35°151015202530
Avg high (°C)Avg low (°C)
12926
22926
32926
42926
52926
62926
72926
82926
92926
102926
112926
122926
132926
142926
152926
162926
172926
182926
192926
202926
212926
222926
232926
242926
252926
262926
272926
282926
292926
302926

How September really feels in Soufriere

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Soufriere weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 24°3311.811.36.6
Feb27° / 24°218.211.57.0
Mar27° / 24°26911.96.8
Apr28° / 25°3610.312.36.2
May29° / 26°4311.612.65.5
Jun29° / 26°7215.312.84.8
Jul29° / 26°9820.312.74.5
Aug29° / 26°11921.712.54.2
Sep29° / 26°11719.412.14.2
Oct29° / 26°13621.211.74.2
Nov28° / 25°10718.811.44.8
Dec28° / 25°431311.26.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25446
35446
45446
55347
65248
75149
85050
94951
104951
114753
124654
134654
144555
154456
164357
174357
184258
194159
204159
214159
224159
234060
244060
254060
264159
274060
283961
294060
303862

Chance of precipitation in September

Any precipitation

Soufriere gets around 117 mm of rain over 19.4 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 69% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
164
263
363
462
562
662
763
863
963
1063
1163
1264
1364
1464
1564
1664
1765
1865
1965
2066
2166
2266
2366
2467
2567
2667
2768
2868
2969
3069

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 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
107228
207228
307228
407228
507228
607228
707228
807228
907327
1007327
1107327
1207426
1307426
1407525
1507525
1607624
1707624
1807624
1907723
2017623
2117623
2217623
2317623
2417623
2517623
2617623
2717524
2817524
2917524
3017425

Wind in September

Winds average 17 km/h in September, the calmest month.

Across September, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze

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 5:56 AM to 5:57 AM, and sunset from 6:12 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:566:12
212.35:566:11
312.25:566:11
412.25:566:10
512.25:566:09
612.25:566:08
712.25:566:08
812.25:566:07
912.25:566:06
1012.25:566:05
1112.15:566:05
1212.15:566:04
1312.15:566:03
1412.15:566:02
1512.15:566:02
1612.15:566:01
1712.15:566:00
1812.05:565:59
1912.05:565:59
2012.05:565:58
2112.05:565:57
2212.05:565:56
2312.05:565:55
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 5.92 kWh/m².

For context, solar energy here swings from a low near 4.95 kWh/m² to a high of 6.61 kWh/m² in April across the year — September's 5.92 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.1Intense
66.1Intense
76.0Intense
86.0Intense
96.0Intense
106.0Intense
116.0Bright
126.0Bright
136.0Bright
145.9Bright
155.9Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for Soufriere

In seasonPeak

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

Soufriere sits in the Atlantic hurricane belt; the season peaks August–October.

Soufriere's rainy season runs June–November, when most of the year's rain falls.

Soufriere 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 Soufriere?

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

4.2
Sightseeing
10th-best month of the year
5.4
Beach & pool
10th-best month of the year

September is a reasonable time to visit Soufriere for sightseeing.

What to pack for Soufriere in September

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

In September, Soufriere sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

Sea temperature near Soufriere 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
Nov29Tropical
Dec28Warm

UV index in Soufriere 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 Soufriere peaks around March 21 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 21UV 14Dec 13UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun11Extreme
Jul12Extreme
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Soufriere 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 Soufriere is worst in June — around 32 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (January, 12 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 1831 µg/m³Jan 112 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar14Moderate
Apr17Moderate
May21Moderate
Jun32Moderate
Jul26Moderate
Aug21Moderate
Sep15Moderate
Oct18Moderate
Nov14Moderate
Dec12Good
Location & terrain

Where is Soufriere?

Soufriere sits at 13.9°N, 61.1°W, 0 m above sea level, in Saint Lucia. The nearest listed city is Castries, 16 km away.

CastriesVieux FortGros Islet

Topography around Soufriere

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Soufriere.

Within 3 km, the terrain around Soufriere has large variations in elevation — a maximum elevation change of 714 m around an average of 197 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 900 m; within 80 km, large variations in elevation — a maximum elevation change of 1,191 m.

The land around Soufriere is covered by trees (73%) and water (24%) within 3 km, water (54%) and trees (44%) within 16 km, and water (90%) within 80 km.

3 km
714 m
16 km
900 m
80 km
1,191 m
treesgrasslandartificial surfaceswater
September weather nearby: Castries 16 km · Vieux Fort 19 km · Gros Islet 26 km · Kingstown 80 km · Ducos 80 km · Calliaqua 82 km · Fort-de-France 83 km · Le Lamentin 84 km

Saint Lucia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / G
240 V · 50 Hz
Prices
≈ 51% of US
price level, 2025
GDP per capita
$14,746
2025
Homicide rate
39
per 100k, 2023
Road deaths
29.8
per 100k/yr, 2019
Income group
Upper middle
World Bank
Religion
Roman Catholic 62%Protestant 26%none 6%other Christian 3%

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 Soufriere (13.8562°, -61.0566°, elevation 0 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).