Gustavia weather in May

In May, Gustavia sees average daytime highs of 27°C and overnight lows near 26°C, with 61 mm of rain across 11.5 wet days and about 12.8 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 43% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of May to 13 hours by month's end. Set against the rest of the year, May is Gustavia's 11th-clearest and 8th-windiest month. For the whole year in context, see Gustavia's year-round climate.

Daytime high
27°
7th warmest
Overnight low
26°
6th coldest
Rainfall
61 mm
11.5 wet days
Daylight
12 h 48 min
5:43 AM – 6:33 PM
Cloud cover
55%
11th clearest
Wind
24 km/h
8th windiest
Solar energy
6.53 kWh/m²
Travel score
6.5
out of 10

Gustavia is main settlement and capital city of St. Barthélemy.

Founded
1785

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical May day in Gustavia reaches about 27°C in the afternoon and slips back to 26°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 27°C. Set against its neighbours, May runs about 1°C warmer than April and on par with June.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12625
22625
32625
42625
52625
62625
72625
82725
92725
102725
112725
122725
132725
142725
152725
162726
172726
182726
192726
202726
212726
222726
232726
242726
252726
262726
272726
282726
292726
302726
312726

How May really feels in Gustavia

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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Gustavia weather by month

How May compares with the rest of the year at a glance. May is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 24°269.1117.5
Feb25° / 24°206.411.47.8
Mar25° / 24°195.411.98.1
Apr26° / 25°307.412.47.5
May27° / 26°6111.512.86.5
Jun27° / 26°4610.313.16.4
Jul28° / 26°7013.8136.1
Aug28° / 27°841512.65.6
Sep28° / 27°11416.812.15.1
Oct28° / 26°12916.211.65.6
Nov27° / 26°10114.111.26.1
Dec26° / 25°4610.810.97.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17327
27228
37030
46931
56733
66634
76436
86238
96139
105941
115941
125743
135644
145545
155446
165446
175347
185347
195347
205248
215149
225149
235050
245149
255149
265149
275149
285149
295149
305248
315248

Chance of precipitation in May

Any precipitation

Gustavia gets around 61 mm of rain over 11.5 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 39% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
130
231
332
432
533
634
734
835
935
1035
1135
1235
1335
1435
1535
1635
1735
1835
1936
2036
2137
2237
2338
2438
2539
2639
2739
2839
2939
3039
3139

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the oppressive band about 89% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1118801
2117811
3116821
4015841
5014851
6013861
7012871
8011881
9010891
1009901
1109892
1208902
1307912
1406922
1506913
1605923
1704924
1804924
1903925
2003925
2102935
2202926
2302926
2402917
2502917
2602908
2702908
2801918
2901909
3001909
3101909

Wind in May

Winds average 24 km/h in May.

Across May, daily wind ranges from about 23 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
124breezy
224breezy
324breezy
424breezy
524breezy
624breezy
724breezy
824breezy
924breezy
1024breezy
1124breezy
1224breezy
1324breezy
1424breezy
1524breezy
1624breezy
1724breezy
1824breezy
1924breezy
2023breezy
2123breezy
2223breezy
2324breezy
2424breezy
2524breezy
2624breezy
2724breezy
2824breezy
2924breezy
3024breezy
3124breezy

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 36 min at the start of May to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over May. Sunrise moves from 5:49 AM to 5:39 AM, and sunset from 6:28 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:496:28
212.75:496:28
312.75:486:28
412.75:486:29
512.75:476:29
612.75:476:29
712.75:466:30
812.75:466:30
912.85:456:30
1012.85:456:31
1112.85:446:31
1212.85:446:31
1312.85:446:32
1412.85:436:32
1512.85:436:32
1612.85:436:33
1712.85:426:33
1812.95:426:34
1912.95:426:34
2012.95:416:34
2112.95:416:35
2212.95:416:35
2312.95:416:35
2412.95:406:36
2512.95:406:36
2612.95:406:36
2713.05:406:37
2813.05:406:37
2913.05:396:38
3013.05:396:38
3113.05:396:38

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.53 kWh/m².

For context, solar energy here swings from a low near 4.5 kWh/m² to a high of 6.68 kWh/m² in April across the year — May's 6.53 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.6Intense
46.6Intense
56.6Intense
66.6Intense
76.5Intense
86.5Intense
96.5Intense
106.5Intense
116.5Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.6Intense
206.6Intense
216.6Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.6Intense
296.6Intense
306.6Intense
316.6Intense
Planning a trip in May

Hazard calendar for Gustavia

In seasonPeak

In May, Gustavia sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

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

Gustavia's rainy season runs May–May, when most of the year's rain falls.

Gustavia 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 May a good time to visit Gustavia?

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

6.5
Sightseeing
6th-best month of the year
6.5
Beach & pool
7th-best month of the year

May is a reasonable time to visit Gustavia for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Gustavia in May

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

In May, Gustavia sees daytime highs around 27°C and nights near 26°C. Pack sun protection. Worth having: light clothes, rain gear and a windbreaker. About 12 days see rain.

sun protectionlight clothesrain geara windbreaker

Sea temperature near Gustavia in May

The nearest coast averages about 27°C in May — 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
Jan27Warm
Feb26Warm
Mar26Warm
Apr27Warm
May27Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Gustavia in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Gustavia peaks around April 11 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 11UV 13Dec 17UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug11Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7High

Air quality in Gustavia in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Gustavia 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 Gustavia?

Gustavia sits at 17.9°N, 62.8°W, 6 m above sea level, in Saint Barthelemy. The nearest listed city is Philipsburg, 25 km away.

Topography around Gustavia

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

Within 3 km, the terrain around Gustavia has only modest variations in elevation — a maximum elevation change of 187 m around an average of 22 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 273 m; within 80 km, large variations in elevation — a maximum elevation change of 1,092 m.

The land around Gustavia is covered by water (66%) and trees (20%) within 3 km, water (98%) within 16 km, and water (97%) within 80 km.

3 km
187 m
16 km
273 m
80 km
1,092 m
treesshrubsgrasslandartificial surfacesbare terrainwater
May weather nearby: Philipsburg 25 km · Marigot 31 km · The Valley 42 km · Basseterre 68 km · Codrington 112 km · St. John's 137 km · Brades 140 km · Plymouth 149 km

Saint Barthelemy travel facts

Travel advisory
Level 1
Exercise Normal Precautions

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 Gustavia (17.8962°, -62.8498°, elevation 6 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).