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Gustavia Weather in September
September in Gustavia brings high temperatures, with daytime highs of 30°C (86°F) and nights around 27°C (81°F). Quite a bit of rainfall is expected, around 131 mm (5.2 in), so pack an umbrella.
Rainfall in Gustavia in September
Historically, September sees about 18 days of rain, with a monthly average of 131 mm (5.2 in). This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Gustavia in September
Daytime highs in Gustavia in September reach 30°C (86°F), with nights around 27°C (81°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights are warm at 27°C (81°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Gustavia in September
With approximately 240 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, June, July and December typically offer the best weather for Gustavia.
Gustavia Temperature in September
Min Temperature
27°C (81°F)
Max Temperature
30°C (86°F)
Chance of Rain
61%
Precipitation
131 mm (5.2 in)
Rainy days
18 days
Humidity
76%
Sunshine
240 hours
Percentage Sunshine
Gustavia Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gustavia - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Gustavia typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Gustavia in September
Browse day-by-day weather records for Gustavia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gustavia historical weather extremes in September
Based on weather observations in Gustavia between 1990 and 2026, these are the recorded extremes during September.
- On September 1, 2016, temperatures climbed to 36°C (97°F), marking the warmest September day on record.
- On September 4, 2009, Gustavia saw its coldest September day with temperatures maxing out at 27°C (81°F).
- Nighttime temperatures dropped to 21°C (70°F) on September 8, 2012, marking the coldest September night on record.
Best Places in Saint Barthélemy in September
Find out more about the weather in Saint Barthélemy and which places have the best travel conditions in this month. See all of Saint Barthélemy in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Gustavia in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Gustavia in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Gustavia 3-Day Forecast
More climate data for Gustavia
Temperature Rainfall Sunshine Humidity
See the full Gustavia climate overview or explore weather in Saint Barthélemy.
Popular in September
Where to go in September - average daytime high across popular destinations.
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