Brittany - France weather in September 2025
Brittany - France weather in September 2025
Day
20 °C
Night
13 °C
Sea
17 °C
Precipitation
58 mm
in month
Rainy days
9 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
81 %
Day
20 °C
Night
13 °C
Sea
17 °C
Precipitation
58 mm
in month
Rainy days
9 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
81 %
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Weather overview and FAQs
Weather overview
In Brittany in September, the average air temperature ranges from 20 °C (67 °F) during the day to 13 °C (55 °F) at night. There are 9 days of rain on average, where the rainfall is 58 mm (2.27 in).
Is September a good month to visit Brittany?
There are good conditions for visiting in Brittany in September. Especially for non-beach activities, such as hiking or sightseeing. You can expect just 9 days of rain during the month, taking an umbrella is not necessary. There are some people, who may feel a slight chill at 20 °C (67 °F), but others will feel perfectly fine. The temperature of 13 °C (55 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
What is the sea temperature in September in Brittany?
The temperature of the sea in Brittany in September is 17 °C (63 °F). At this sea temperature, swimming probably won't be the best experience. You probably won't like to stay in water for a long time. On the other hand, there are a minority of people who seek these conditions.
What temperature can I expect during the day in Brittany in September?
In September in Brittany, the average daily temperatures will be 20 °C (67 °F). Nice temperature for walking around the city or on the beach, but you will probably get cold soon when wearing a swimsuit. When walking around all day, people used to cold conditions, pull out their shorts and get rid of their sweaters. On some days, when spending time in the direct sun, sunscreen can be useful, especially for people with more sensitive skin.
What is the average number of rainy days in September in Brittany?
There are 9 days, which are rainy in Brittany in September, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 2.2 days of the week, or in general - 31 % days.
What is the night temperature in September in Brittany?
The average night temperature in Brittany in September is 13 °C (55 °F). Nights can be cooler, morning running can be refreshing but choose appropriate clothing, evening outdoor sitting can be pleasant but you can also be cold.
What is the rainfall intensity in September in Brittany?
There is precipitation of 58 mm (2.27 in) in Brittany in September, which means 2 mm (0.07 in) rainfall per day on average.
How many hours of sun to expect in September in Brittany?
There is an average length of sunshine of 6 hours per day in September in Brittany.
How long is the day (from dawn till dusk) in Brittany in September?
The length of daylight in Brittany in September is 12 hours.
Is September part of the dry season in Brittany?
No, September is not a dry month in Brittany, expect rain approximately 9 days in a month.
Is September part of the wet season in Brittany?
No, there is no wet season in Brittany in September - you can expect 9 days of rain during the month.
Is the weather in Brittany warmer in September than in August?
No, in Brittany in September the temperature is not higher than in August.
How humid is Brittany in September?
Humidity in Brittany in September is 81 %. This humidity is rather above average, but except for sensitive individuals, it should not be a problem.
Is the sea in Brittany warmer in September than in August?
No, the sea is not warmer in Brittany in September than in August.
Is Brittany rainier in September than in October?
No, in Brittany in September it does not rain more than in October.
How windy is Brittany in September?
In September in Brittany, there will be an average wind scale of 5.