The Valley weather in September

In September, The Valley sees average daytime highs of 28°C and overnight lows near 27°C, with 117 mm of rain across 17.2 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 35% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is The Valley's 12th-clearest and 11th-windiest month. For the whole year in context, see The Valley's year-round climate.

Daytime high
28°
1st warmest
Overnight low
27°
12th coldest
Rainfall
117 mm
17.2 wet days
Daylight
12 h 06 min
6:04 AM – 6:10 PM
Cloud cover
59%
12th clearest
Wind
22 km/h
11th windiest
Solar energy
5.89 kWh/m²
Travel score
5.1
out of 10

The Valley is capital of the island of Anguilla.

Density
748/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 The Valley reaches about 28°C in the afternoon and slips back to 27°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 29°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)
12827
22827
32827
42827
52827
62827
72827
82827
92827
102827
112827
122827
132827
142827
152827
162827
172827
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826

How September really feels in The Valley

Once humidity and wind are folded in, September averages 21 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
21
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.

The Valley 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°278.7117.6
Feb25° / 24°216.611.47.8
Mar25° / 24°225.811.98.0
Apr26° / 25°327.712.47.4
May27° / 25°6011.812.86.4
Jun27° / 26°4710.313.16.4
Jul28° / 26°7114.1136.0
Aug28° / 27°8315.112.65.6
Sep28° / 27°11717.212.15.1
Oct28° / 26°12916.111.65.6
Nov27° / 26°10414.811.16.0
Dec26° / 25°4711.310.96.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25644
35644
45644
55644
65545
75545
85446
95347
105248
115149
125149
135050
144951
154951
164951
174852
184753
194753
204753
214654
224654
234654
244654
254753
264753
274852
284951
294852
305050

Chance of precipitation in September

Any precipitation

The Valley gets around 117 mm of rain over 17.2 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 56% and peaks near 59% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
153
253
353
453
553
654
754
854
954
1054
1155
1255
1355
1456
1556
1657
1757
1858
1958
2059
2159
2259
2359
2459
2559
2658
2758
2857
2957
3057

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
14456
24456
34357
44357
54357
64357
74456
84456
94456
104555
114555
124654
134753
144852
154852
164951
175050
185149
195248
205347
215446
225545
235644
245743
255743
265842
275941
286040
296139
306238

Wind in September

Winds average 22 km/h in September.

Across September, daily wind ranges from about 21 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
124breezy
224breezy
323breezy
423breezy
523breezy
623breezy
723breezy
823breezy
923breezy
1023breezy
1123breezy
1223breezy
1323breezy
1423breezy
1522breezy
1622breezy
1722breezy
1822breezy
1922breezy
2022breezy
2122breezy
2222breezy
2321breezy
2421breezy
2521breezy
2621breezy
2721breezy
2821breezy
2921breezy
3021breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 30 minutes over September. Sunrise moves from 6:01 AM to 6:06 AM, and sunset from 6:23 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:016:23
212.36:016:22
312.36:016:21
412.36:026:20
512.36:026:19
612.36:026:19
712.36:026:18
812.26:026:17
912.26:026:16
1012.26:036:15
1112.26:036:14
1212.26:036:13
1312.26:036:12
1412.16:036:11
1512.16:036:11
1612.16:046:10
1712.16:046:09
1812.16:046:08
1912.06:046:07
2012.06:046:06
2112.06:046:05
2212.06:046:04
2312.06:056:03
2412.06:056:02
2511.96:056:02
2611.96:056:01
2711.96:056:00
2811.96:065:59
2911.96:065:58
3011.96:065:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.89 kWh/m².

For context, solar energy here swings from a low near 4.47 kWh/m² to a high of 6.68 kWh/m² in June across the year — September's 5.89 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
96.0Intense
106.0Intense
116.0Bright
126.0Bright
136.0Bright
145.9Bright
155.9Bright
165.9Bright
175.9Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Hazard calendar for The Valley

In seasonPeak

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

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

The Valley's rainy season runs July–November, when most of the year's rain falls.

The Valley sees seasonal dust haze (July), heaviest in July.

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

Is September a good time to visit The Valley?

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

5.1
Sightseeing
12th-best month of the year
5.8
Beach & pool
12th-best month of the year

September is a reasonable time to visit The Valley for sightseeing.

What to pack for The Valley in September

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

In September, The Valley sees daytime highs around 28°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection and a windbreaker. About 17 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near The Valley 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 26°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar26Warm
Apr27Warm
May27Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in The Valley 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 The Valley peaks around April 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 12UV 13Dec 17UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar13Extreme
Apr13Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug11Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in The Valley 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 The Valley is worst in July — around 23 µg/m³ PM2.5 (moderate), about 4.1× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1223 µg/m³Dec 226 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar7Good
Apr9Good
May13Moderate
Jun22Moderate
Jul23Moderate
Aug19Moderate
Sep15Moderate
Oct16Moderate
Nov9Good
Dec6Good
Location & terrain

Where is The Valley?

The Valley sits at 18.2°N, 63.1°W, 7 m above sea level, in Anguilla. The nearest listed city is Marigot, 17 km away.

Topography around The Valley

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

Within 3 km, the terrain around The Valley has only modest variations in elevation — a maximum elevation change of 70 m around an average of 22 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 417 m; within 80 km, large variations in elevation — a maximum elevation change of 808 m.

The land around The Valley is covered by trees (35%) and water (24%) within 3 km, water (88%) within 16 km, and water (99%) within 80 km.

3 km
70 m
16 km
417 m
80 km
808 m
treesshrubsgrasslandartificial surfacesbare terrainwater
September weather nearby: Marigot 17 km · Philipsburg 21 km · Gustavia 42 km · Basseterre 108 km · Codrington 145 km · Road Town 167 km · St. John's 177 km · Brades 182 km

Anguilla travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
110 / 120 / 127 / 240 V · 60 Hz
Religion
Protestant 73%other Christian 11%Roman Catholic 7%none 5%

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 The Valley (18.217°, -63.0578°, elevation 7 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).