Weather in September
Temperature
June through October, when the average high-temperature reaches 31°C (87.8°F), are the warmest months.Rainfall
September is the month with the most rainfall. Rain falls for 19 days and accumulates 129mm (5.08") of precipitation.Sea temperature
September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Saint-Barthélemy, Canada.Note: Water activities including swimming and diving are pleasurable in temperatures between 25°C (77°F) and 29°C (84.2°F), ensuring comfort and enjoyment for extended time frames.
Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:13 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:33 pm EDT.
Sunshine
The months with the least sunshine are January, February, May through July, September through December, with an average of 8h of sunshine.UV index
March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 12 in September leads to these recommendations:
Take every vital safeguard, as unprotected skin and eyes may suffer burns rapidly. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Despite the cloudy weather, sunscreen with a sun protection factor of at least 30 should be liberally applied and reapplied, including after a swim or outdoor activity. Alert! The Sun's UV rays are heightened by the reflection of sand and water.
Frequently asked questions
What is the hottest time of year in Saint-Barthélemy?
How hot is September in Saint-Barthélemy?
What is the rainiest month in Saint-Barthélemy?
How many days does it rain in September in Saint-Barthélemy?
What are the months with the warmest sea water in Saint-Barthélemy?
How warm is the water in September in Saint-Barthélemy?
How many hours of daylight does Saint-Barthélemy have in September?
When are sunrise and sunset in September in Saint-Barthélemy?
What are the months with the least sunshine in Saint-Barthélemy?
How long on average sun shines in September in Saint-Barthélemy?
What is the month with the highest UV index in Saint-Barthélemy?
What is the UV index intensity in September in Saint-Barthélemy?
Average temperature in September
Saint-Barthélemy, Canada
- Average high temperature in September: 31°C
The warmest months (with the highest average high temperature) are June, July, August, September and October (31°C).
The months with the lowest average high temperature are January, February, March and December (29°C).
- Average low temperature in September: 25°C
The months with the highest average low temperature are June, July, August, September and October (25°C).
The coldest months (with the lowest average low temperature) are January, February, March and December (23°C).
Average rainfall in September
Saint-Barthélemy, Canada
- Average rainfall in September: 129mm
The wettest month (with the highest rainfall) is September (129mm).
The driest months (with the least rainfall) are February and March (43mm).
Average rainfall days in September
Saint-Barthélemy, Canada
- Average rainfall days in September: 19 days
The month with the highest number of rainy days is November (21 days).
The month with the least rainy days is April (12 days).
Average sea temperature in September
Saint-Barthélemy, Canada
- Average sea temperature in September: 29°C
The best months for swimming (with the highest average sea temperature) are September and October (29°C).
The coldest months (with the lowest average sea temperature) are January, February and March (26°C).
Average daylight in September /
Average sunshine in September
Saint-Barthélemy, Canada
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h
The months with the most sunshine are March, April and August (Average sunshine: 9h).
The months with the least sunshine are January, February, May, June, July, September, October, November and December (Average sunshine: 8h).
Average UV index in September
Saint-Barthélemy, Canada
- Average UV index in September: 12
The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).
Saint-Barthélemy, Canada
Weather forecast for your location
2. Allow the app to use your location
