Saint Croix weather in August

In August, Saint Croix sees average daytime highs of 28°C and overnight lows near 27°C, with 104 mm of rain across 16.9 wet days and about 12.6 hours of daylight. It is the 1st-warmest and 4th-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 47% of the time in August, and the air most often feels miserable.

Daylight stretches from about 12 h 48 min at the start of August to 12 h 24 min by month's end. Set against the rest of the year, August is Saint Croix's 8th-clearest and 6th-windiest month. For the whole year in context, see Saint Croix's year-round climate.

Daytime high
28°
1st warmest
Overnight low
27°
12th coldest
Rainfall
104 mm
16.9 wet days
Daylight
12 h 36 min
6:05 AM – 6:41 PM
Cloud cover
51%
8th clearest
Wind
25 km/h
6th windiest
Solar energy
6.34 kWh/m²
Travel score
5.1
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

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

A typical August day in Saint Croix 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 28°C and 29°C. Set against its neighbours, August runs on par with July and on par with September.

24°26°28°30°32°151015202531
Avg high (°C)Avg low (°C)
12827
22827
32827
42827
52827
62827
72827
82827
92827
102827
112827
122827
132827
142827
152827
162827
172827
182827
192827
202827
212827
222827
232827
242827
252827
262827
272827
282827
292827
302827
312827

How August really feels in Saint Croix

Once humidity and wind are folded in, August averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Saint Croix weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 25°278.311.17.6
Feb26° / 24°185.911.47.9
Mar26° / 24°206.111.97.9
Apr26° / 25°327.512.47.4
May27° / 26°7512.312.86.3
Jun28° / 26°5811.7136.1
Jul28° / 26°8014.6135.9
Aug28° / 27°10416.912.65.1
Sep28° / 27°13717.612.14.8
Oct28° / 26°12717.911.65.2
Nov27° / 26°11615.511.25.9
Dec26° / 25°4811.7116.9

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 14% of August, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16634
26535
36634
46634
56535
66535
76634
86634
96634
106634
116634
126535
136634
146535
156436
166337
176238
186139
196040
205941
215842
225743
235743
245545
255545
265446
275446
285347
295347
305248
315248

Chance of precipitation in August

Any precipitation

Saint Croix gets around 104 mm of rain over 16.9 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 55% and peaks near 59% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
150
250
350
450
550
650
750
850
951
1051
1152
1253
1353
1454
1555
1655
1756
1857
1958
2058
2159
2259
2359
2459
2559
2659
2758
2858
2957
3057
3157

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the miserable band about 63% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
14654
24555
34555
44456
54357
64258
74159
84159
94060
103961
113961
123862
133763
143763
153664
163664
173565
183565
193466
203466
213367
223367
233268
243268
253268
263169
273169
283268
293268
303268
313367

Wind in August

Winds average 25 km/h in August.

Across August, daily wind ranges from about 23 km/h on the calmest days to 27 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
127breezy
226breezy
326breezy
426breezy
526breezy
626breezy
726breezy
826breezy
926breezy
1026breezy
1126breezy
1225breezy
1325breezy
1425breezy
1525breezy
1625breezy
1725breezy
1825breezy
1925breezy
2025breezy
2125breezy
2224breezy
2324breezy
2424breezy
2524breezy
2624breezy
2724breezy
2823breezy
2923breezy
3023breezy
3123breezy

Sunrise & sunset in August

DaylightNight

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

Days shrink by about 24 minutes over August. Sunrise moves from 6:01 AM to 6:08 AM, and sunset from 6:49 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:016:49
212.86:016:49
312.86:016:48
412.86:026:48
512.86:026:47
612.76:026:47
712.76:036:46
812.76:036:46
912.76:036:45
1012.76:036:45
1112.76:046:44
1212.76:046:44
1312.66:046:43
1412.66:056:42
1512.66:056:42
1612.66:056:41
1712.66:056:41
1812.66:056:40
1912.66:066:39
2012.56:066:38
2112.56:066:38
2212.56:066:37
2312.56:076:36
2412.56:076:36
2512.56:076:35
2612.46:076:34
2712.46:076:33
2812.46:076:32
2912.46:086:32
3012.46:086:31
3112.46:086:30

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.34 kWh/m².

For context, solar energy here swings from a low near 4.52 kWh/m² to a high of 6.65 kWh/m² in April across the year — August's 6.34 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.4Intense
106.4Intense
116.4Intense
126.4Intense
136.4Intense
146.4Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.2Intense
286.2Intense
296.2Intense
306.2Intense
316.2Intense
Planning a trip in August

Hazard calendar for Saint Croix

In seasonPeak

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

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

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

Saint Croix 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 August a good time to visit Saint Croix?

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

5.1
Sightseeing
11th-best month of the year
6.0
Beach & pool
10th-best month of the year

August is a reasonable time to visit Saint Croix for sightseeing.

What to pack for Saint Croix in August

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

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

light clothesrain gearsun protectiona windbreaker

Sea temperature near Saint Croix in August

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

The sea at the nearest coast (about 17 km away) 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
Jan27Warm
Feb26Warm
Mar26Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec28Warm

UV index in Saint Croix in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saint Croix peaks around April 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (very 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 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar13Extreme
Apr13Extreme
May11Extreme
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Saint Croix in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Saint Croix is worst in July — around 24 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1124 µg/m³Dec 236 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar7Good
Apr9Good
May14Moderate
Jun23Moderate
Jul24Moderate
Aug20Moderate
Sep15Moderate
Oct15Moderate
Nov9Good
Dec6Good
Location & terrain

Where is Saint Croix?

Saint Croix sits at 17.7°N, 64.7°W, 87 m above sea level, in U.S. Virgin Islands. The nearest listed city is Charlotte Amalie, 71 km away.

Charlotte AmalieRoad Town

Topography around Saint Croix

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

Within 3 km, the terrain around Saint Croix has only modest variations in elevation — a maximum elevation change of 177 m around an average of 57 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 346 m; within 80 km, significant variations in elevation — a maximum elevation change of 512 m.

The land around Saint Croix is covered by trees (52%) and artificial surfaces (31%) within 3 km, water (74%) within 16 km, and water (96%) within 80 km.

3 km
177 m
16 km
346 m
80 km
512 m
treesshrubsgrasslandartificial surfacesbare terrainwater
August weather nearby: Charlotte Amalie 71 km · Road Town 79 km · Fajardo 117 km · Humacao 124 km · Carolina 147 km · Guayama 147 km · Caguas 149 km · Trujillo Alto 150 km

U.S. Virgin Islands travel facts

Power plugs
Type A / B
110 V · 60 Hz
Prices
≈ 89% of US
price level, 2022
GDP per capita
$44,321
2022
Safe drinking water
99%
of population, 2024
Homicide rate
49.9
per 100k, 2012
Income group
High
World Bank

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 Saint Croix (17.7275°, -64.747°, elevation 87 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).