Gustavia in Summer
In summer (June, July and August), Gustavia sees average daytime highs around 28°C and overnight lows near 26°C, with 199 mm of rain over about 39 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 50% of the time across summer, and the air most often feels oppressive.
Summer is Gustavia's 3rd-best season to visit on our travel score. Gustavia has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Gustavia's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 26°C
- Rainfall
- 199 mm
- 39 wet days
- Avg wind
- 27 km/h
- Travel score
- 6.0
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in Gustavia in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in Gustavia reaches about 28°C and drops to 26°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Gustavia
Once humidity and wind are folded in, summer brings about 24 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Gustavia weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 26° / 24° | 26 | 9.1 | 11 | 7.5 |
| Feb | 25° / 24° | 20 | 6.4 | 11.4 | 7.8 |
| Mar | 25° / 24° | 19 | 5.4 | 11.9 | 8.1 |
| Apr | 26° / 25° | 30 | 7.4 | 12.4 | 7.5 |
| May | 27° / 26° | 61 | 11.5 | 12.8 | 6.5 |
| Jun | 27° / 26° | 46 | 10.3 | 13.1 | 6.4 |
| Jul | 28° / 26° | 70 | 13.8 | 13 | 6.1 |
| Aug | 28° / 27° | 84 | 15 | 12.6 | 5.6 |
| Sep | 28° / 27° | 114 | 16.8 | 12.1 | 5.1 |
| Oct | 28° / 26° | 129 | 16.2 | 11.6 | 5.6 |
| Nov | 27° / 26° | 101 | 14.1 | 11.2 | 6.1 |
| Dec | 26° / 25° | 46 | 10.8 | 10.9 | 7.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 50% of the time across summer.
Chance of precipitation in Summer
Gustavia gets around 199 mm of rain over 39 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 27 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 hours in early June to 12 h 24 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.6 kWh/m².
Hazard calendar for Gustavia
In summer, Gustavia overlaps its atlantic hurricane, rainy season and dust 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 July–November, when most of the year's rain falls.
Gustavia sees seasonal dust haze (July), heaviest in July.
Is summer a good time to visit Gustavia?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer 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 Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Gustavia sees daytime highs around 28°C and nights near 26°C. Pack light clothes, rain gear and sun protection. Worth having: a windbreaker. About 39 days see rain.
Sea temperature near Gustavia in Summer
The nearest coast averages about 28°C across summer — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 26 | 26 | 27 | 27 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 26 | Warm |
| Mar | 26 | Warm |
| Apr | 27 | Warm |
| May | 27 | Warm |
| Jun | 28 | Warm |
| Jul | 28 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 28 | Tropical |
| Dec | 27 | Warm |
UV index in Gustavia in Summer
Clear-sky midday UV across summer averages 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 11 | 13 | 13 | 12 | 12 | 12 | 11 | 12 | 10 | 8 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 11 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 12 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Gustavia in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 8 | 7 | 9 | 13 | 22 | 23 | 19 | 15 | 16 | 9 | 6 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 8 | Good |
| Mar | 7 | Good |
| Apr | 9 | Good |
| May | 13 | Moderate |
| Jun | 22 | Moderate |
| Jul | 23 | Moderate |
| Aug | 19 | Moderate |
| Sep | 15 | Moderate |
| Oct | 16 | Moderate |
| Nov | 9 | Good |
| Dec | 6 | Good |
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.
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.