Gustavia climate
Gustavia (Saint Barthelemy) has a hot semi-arid climate (Köppen BSh). The average temperature over the year is 27 °C81 °F, and about 614 mm24 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Gustavia climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2679 | 2578 | 2679 | 200.8 |
| Feb | 2679 | 2577 | 2678 | 120.5 |
| Mar | 2679 | 2577 | 2678 | 160.6 |
| Apr | 2780 | 2678 | 2679 | 261.0 |
| May | 2781 | 2780 | 2781 | 632.5 |
| Jun | 2883 | 2781 | 2882 | 421.7 |
| Jul | 2983 | 2882 | 2883 | 542.1 |
| Aug | 2984 | 2882 | 2883 | 662.6 |
| Sep | 2984 | 2882 | 2883 | 903.6 |
| Oct | 2984 | 2882 | 2883 | 1084.2 |
| Nov | 2882 | 2781 | 2781 | 783.1 |
| Dec | 2781 | 2679 | 2780 | 401.6 |
| Year | 2984 | 2577 | 2781 | 61424 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 76% | 36% | 4.9 | 11:10 |
| Feb | 75% | 34% | 5.6 | 11:32 |
| Mar | 75% | 39% | 6.3 | 11:00 |
| Apr | 76% | 43% | 6.6 | 12:32 |
| May | 79% | 56% | 6.4 | 12:58 |
| Jun | 79% | 56% | 6.3 | 13:12 |
| Jul | 79% | 49% | 6.3 | 13:06 |
| Aug | 79% | 45% | 6.4 | 12:44 |
| Sep | 79% | 53% | 5.9 | 12:13 |
| Oct | 78% | 51% | 5.3 | 11:42 |
| Nov | 78% | 45% | 4.8 | 11:16 |
| Dec | 77% | 40% | 4.5 | 11:04 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Gustavia is like
The warmest month is September, with an average high of 29 °C84 °F and a low of 28 °C82 °F. The coldest is February, when highs average 26 °C79 °F and lows 25 °C77 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 2.9 °C5.3 °F.
Annual precipitation is moderate at about 614 mm24 in. The wettest three-month stretch is September–November, which brings 45% of the annual total. Months with less than 20 mm0.8 in on average: February and March. The wettest month is October (108 mm4.2 in), the driest is February (12 mm0.5 in).
Relative humidity ranges from 75% in March to 79% in May. The clearest skies (lowest average cloud amount, 34%) are typical of February. Average wind speed near the ground ranges from 17 km/h (11 mph) in September to 23 km/h (14 mph) in July. Daylight lasts from about 11.1 hours in December to 13.2 hours in June.
Best time to visit Gustavia
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–August: average highs of 26 °C79 °F to 29 °C84 °F with 12 mm0.5 in to 78 mm3.1 in of precipitation per month.
The most challenging month is October, which is humid (78% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Gustavia
- Wetter months (May, July–November) — highs 2781 to 29 °C84 °F, lows 2780 to 28 °C82 °F, about 76 mm3.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
- Drier months (December–April, June) — highs 2679 to 28 °C83 °F, lows 2577 to 27 °C81 °F, about 26 mm1.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Gustavia compares
Compared with Basseterre, about 68 km to the south, Gustavia has practically the same average temperature and receives 22% less precipitation (614 mm24 in vs 792 mm31 in).
Places in other countries with the most similar temperature and rainfall pattern: Marigot (Saint Martin, BSh), Road Town (British Virgin Islands, BSh) and Basseterre (Saint Kitts and Nevis, Aw).
Nearby places
- Marigot 31 km · 27 °C81 °F · 614 mm24 in
- Basseterre 68 km · 27 °C81 °F · 792 mm31 in
- Saint Johns 137 km · 27 °C81 °F · 1,108 mm44 in
- Plymouth 149 km · 27 °C80 °F · 1,003 mm39 in
- Road Town 196 km · 27 °C81 °F · 646 mm25 in
- Charlotte Amalie 225 km · 27 °C81 °F · 1,002 mm39 in
- Basse-Terre 242 km · 27 °C81 °F · 1,171 mm46 in
- Roseau 328 km · 27 °C81 °F · 1,419 mm56 in
Frequently asked questions
What is the warmest month in Gustavia?
September is the warmest month in Gustavia, with an average high of 29 °C (84 °F) and an average low of 28 °C (82 °F).
What is the coldest month in Gustavia?
February is the coldest month, with an average high of 26 °C (79 °F) and an average low of 25 °C (77 °F).
When does it rain the most in Gustavia?
October is the wettest month with about 108 mm (4.2 in) of precipitation; February is the driest with about 12 mm (0.5 in).
What is the best time to visit Gustavia?
Judging by long-term averages, the most comfortable months are November–August.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.