Saint Barthélemy Weather in September
September in Saint Barthélemy averages 30°C (86°F) during the day and 27°C (81°F) at night. Quite a bit of rainfall is typical this month, with around 131 mm (5.2 in) on average. An umbrella is a good idea.
Rainfall in Saint Barthélemy in September
Typically, you can expect about 18 days of rain this month, with 131 mm (5.2 in) on average. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Saint Barthélemy in September
Saint Barthélemy in September gets highs of 30°C (86°F) during the day and drops to 27°C (81°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 27°C (81°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.
Sunshine in Saint Barthélemy in September
Expect a lot of sunshine this month, with about 240 hours of sun. These sunny conditions add to the overall experience.
Wind Speed in Saint Barthélemy in September
Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.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 Saint Barthélemy.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Barthélemy, check out our Saint Barthélemy's climate page.
Saint Barthélemy 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%
Windspeed
5 m/s (10 knots)
Sunshine
240 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Saint Barthélemy 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 for Saint Barthélemy in September
Browse day-by-day weather records for Saint Barthélemy spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Saint Barthélemy historical weather extremes in September
Based on 35 years of weather observations (1990-2025), these are the most extreme conditions recorded in Saint Barthélemy.
- On September 1, 2016, temperatures climbed to 37°C (99°F), marking the warmest September day on record.
- On September 4, 2009, Saint Barthélemy saw its coldest September day with temperatures maxing out at 27°C (81°F).
- The coldest night in September in Saint Barthélemy was on September 8, 2012, with a minimum of 22°C (72°F).
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 →
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What to Wear in Saint Barthélemy in September
Warm but pleasant conditions in Saint Barthélemy in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Saint Barthélemy in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Barthélemy, check out our Saint Barthélemy's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Saint Barthélemy climate overview or explore weather in Saint Barthélemy.
