Brest
France
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Brest, France

September, the first month of the autumn, in Brest, is still a comfortable month, with average temperature fluctuating between 11.6°C (52.9°F) and 19.1°C (66.4°F).

Temperature

In September, the average high-temperature is practically the same as in August - an enjoyable 19.1°C (66.4°F). In Brest, the average low-temperature is 11.6°C (52.9°F).

Humidity

In Brest, the average relative humidity is 85%.

Rainfall

In September, in Brest, France, the rain falls for 10.1 days. Throughout September, 83.3mm (3.28") of precipitation is accumulated. In Brest, during the entire year, the rain falls for 159 days and collects up to 1210mm (47.64") of precipitation.

Snowfall

June through October are months without snowfall.

Sea temperature

In Brest, the average water temperature is 16.6°C (61.9°F).
Note: Swimming in 16.6°C (61.9°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

In Brest, the average length of the day is 12.6h.

Sunshine

In Brest, France, the average sunshine in September is 5.3h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Brest?

In Brest, in September, the average high-temperature is 19.1°C (66.4°F), and the average low-temperature is 11.6°C (52.9°F).

What is the average humidity in September in Brest?

In September, the average relative humidity in Brest, France, is 85%.

How much does it rain in Brest in September?

In Brest, during September, the rain falls for 10.1 days and regularly aggregates up to 83.3mm (3.28") of precipitation.

When it does not snow in Brest?

In Brest, France, snow does not fall in June through October.

What is the sea temperature in September in Brest?

In September, the average sea temperature in Brest is 16.6°C (61.9°F). Swimming in 16.6°C (61.9°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Brest have in September?

The average length of the day in September is 12.6h.

How long on average sun shines in September in Brest?

The average sunshine in September in Brest is 5.3h.

What is the UV index intensity in September in Brest?

The average daily maximum UV index in September in Brest is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Brest, France
  • Average high temperature in September: 19.1°C

The warmest month (with the highest average high temperature) is August (20.8°C).
The month with the lowest average high temperature is January (9.3°C).

  • Average low temperature in September: 11.6°C

Months with the highest average low temperature are July and August (13.2°C).
The coldest month (with the lowest average low temperature) is February (4.1°C).

Average humidity in September - Brest, France
  • Average humidity in September: 85%

Months with the highest relative humidity are January, October and December (86%).
Months with the lowest relative humidity are April and May (81%).

Average rainfall in September - Brest, France
  • Average rainfall in September: 83.3mm

The wettest month (with the highest rainfall) is December (147.8mm).
The driest month (with the least rainfall) is June (59.8mm).

Average rainfall days in September - Brest, France
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is January (17.7 days).
The month with the least rainy days is June (8.6 days).

Average snowfall days in September - Brest, France
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

Average sea temperature in September - Brest, France
  • Average sea temperature in September: 16.6°C

The best month for swimming (with the highest average sea temperature) is August (16.9°C).
The coldest month (with the lowest average sea temperature) is March (10.2°C).

Average daylight in September / Average sunshine in September - Brest, France
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in September: 5.3h

The month with the most sunshine is June (Average sunshine: 6.4h).
The month with the least sunshine is January (Average sunshine: 2h).

Average UV index in September - Brest, France
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).