West Bay weather in September

In September, West Bay sees average daytime highs of 29°C and overnight lows near 27°C, with 139 mm of rain across 18.6 wet days and about 12.1 hours of daylight. It is the 2nd-warmest and 2nd-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 35% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is West Bay's 11th-clearest and 12th-windiest month. For the whole year in context, see West Bay's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
27°
10th coldest
Rainfall
139 mm
18.6 wet days
Daylight
12 h 06 min
6:17 AM – 6:23 PM
Cloud cover
58%
11th clearest
Wind
18 km/h
12th windiest
Solar energy
5.81 kWh/m²
Travel score
4.5
out of 10

West Bay is populated place in the Cayman Islands.

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 West Bay reaches about 29°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 28°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)
12927
22927
32927
42927
52927
62927
72927
82927
92927
102927
112927
122927
132927
142927
152927
162927
172927
182927
192927
202927
212927
222927
232927
242927
252927
262927
272927
282927
292927
302927

How September really feels in West Bay

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.

West Bay weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 25°286.6117.7
Feb26° / 25°132.811.38.4
Mar26° / 25°163.911.98.3
Apr27° / 26°183.712.48.0
May28° / 26°9511.212.96.5
Jun28° / 27°10413.213.15.4
Jul29° / 27°6012.313.15.4
Aug29° / 27°9315.312.75.0
Sep29° / 27°13918.612.14.5
Oct28° / 27°2142011.64.7
Nov27° / 26°10812.111.16.4
Dec26° / 25°448.510.97.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25446
35446
45347
55347
65446
75446
85545
95446
105446
115446
125446
135446
145347
155347
165248
175248
185149
195050
205050
214951
224753
234753
244753
254555
264555
274456
284456
294357
304357

Chance of precipitation in September

Any precipitation

West Bay gets around 139 mm of rain over 18.6 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 63% and peaks near 72% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
156
256
356
456
556
656
756
856
956
1057
1157
1258
1359
1460
1561
1662
1763
1864
1965
2067
2168
2269
2370
2471
2571
2672
2772
2872
2972
3072

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 86% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
11090
21090
31090
41090
51090
61090
71090
81090
91090
101090
111189
121189
131189
141288
151288
161387
171486
181486
191585
201684
211684
221783
231882
241981
251981
261981
272080
282080
292080
302179

Wind in September

Winds average 18 km/h in September, the calmest month.

Across September, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:14 AM to 6:20 AM, and sunset from 6:37 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:146:37
212.46:146:36
312.46:146:35
412.36:146:34
512.36:146:33
612.36:156:32
712.36:156:32
812.36:156:31
912.26:156:30
1012.26:156:29
1112.26:166:28
1212.26:166:27
1312.26:166:26
1412.16:166:25
1512.16:166:24
1612.16:176:23
1712.16:176:22
1812.16:176:21
1912.16:176:20
2012.06:176:19
2112.06:186:18
2212.06:186:18
2312.06:186:17
2412.06:186:16
2511.96:186:15
2611.96:196:14
2711.96:196:13
2811.96:196:12
2911.96:196:11
3011.86:206:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.81 kWh/m².

For context, solar energy here swings from a low near 4.2 kWh/m² to a high of 6.75 kWh/m² in April across the year — September's 5.81 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
125.9Bright
135.9Bright
145.9Bright
155.8Bright
165.8Bright
175.8Bright
185.7Bright
195.7Bright
205.6Bright
215.6Bright
225.5Bright
235.5Bright
245.5Bright
255.4Bright
265.4Bright
275.3Bright
285.3Bright
295.3Bright
305.2Bright
Planning a trip in September

Hazard calendar for West Bay

In seasonPeak

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

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

West Bay's rainy season runs September–November, when most of the year's rain falls.

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

Is September a good time to visit West Bay?

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

4.5
Sightseeing
12th-best month of the year
5.6
Beach & pool
11th-best month of the year

September is a reasonable time to visit West Bay for sightseeing.

What to pack for West Bay in September

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

In September, West Bay sees daytime highs around 29°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

Sea temperature near West Bay in September

The nearest coast averages about 30°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 August at about 30°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°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr27Warm
May28Tropical
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov28Tropical
Dec28Warm

UV index in West Bay 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 West Bay peaks around May 13 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 highMay 13UV 12Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar12Extreme
Apr12Extreme
May12Extreme
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in West Bay 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 West Bay is worst in June — around 27 µg/m³ PM2.5 (moderate), about 4.1× the cleanest month (January, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 2127 µg/m³Jan 17 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar8Good
Apr10Good
May14Moderate
Jun27Moderate
Jul25Moderate
Aug19Moderate
Sep13Moderate
Oct10Good
Nov7Good
Dec7Good
Location & terrain

Where is West Bay?

West Bay sits at 19.4°N, 81.4°W, 5 m above sea level, in Cayman Islands. The nearest listed city is George Town, 11 km away.

George Town

Topography around West Bay

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

Within 3 km, the terrain around West Bay has only modest variations in elevation — a maximum elevation change of 10 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 21 m; within 80 km, only modest variations in elevation — a maximum elevation change of 24 m.

The land around West Bay is covered by water (59%) within 3 km, water (91%) within 16 km, and water (97%) within 80 km.

3 km
10 m
16 km
21 m
80 km
24 m
treesgrasslandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: George Town 11 km · Trinidad 306 km · Nueva Gerona 315 km · Condado 321 km · Cienfuegos 323 km · Cumanayagua 332 km · Abreus 333 km · Palmira 335 km

Cayman Islands travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 113% of US
price level, 2024
GDP per capita
$104,293
2024
Homicide rate
4.4
per 100k, 2020
Income group
High
World Bank
Religion
Protestant 61%none 17%Roman Catholic 14%other 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 West Bay (19.382°, -81.3928°, 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).