Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average UV index in September
Weather in September
Temperature
September experiences an average high-temperature of a still agreeable 20°C (68°F), barely different from August's 22°C (71.6°F). September brings St-Malo a consistent average low-temperature of 11.7°C (53.1°F).Humidity
In St-Malo, France, the average relative humidity in September is 82%.Rainfall
In St-Malo, France, in September, it is raining for 9.7 days, with typically 62mm (2.44") of accumulated precipitation. In St-Malo, during the entire year, the rain falls for 129.4 days and collects up to 759mm (29.88") of precipitation.Snowfall
May through October are months without snowfall.Sea temperature
With an average sea temperature of 18.2°C (64.8°F), September is the month with the warmest seawater.Note: In water with a temperature of 18.2°C (64.8°F), most individuals do not find swimming enjoyable. As the temperature falls from 21°C (69.8°F) to 15°C (59°F), breathing control becomes more difficult.
Daylight
In September, the average length of the day is 12h and 35min.On the first day of the month, sunrise is at 07:25 and sunset at 20:49. On the last day of September, in St-Malo, sunrise is at 08:06 and sunset at 19:48 CEST.
Sunshine
The average sunshine in September is 5.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Exercise prevention - Precautions against solar damage are endorsed. Around midday, solar radiation is most harmful; hence, exposure should be limited. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Frequently asked questions
What is the usual temperature for St-Malo in September?
What is the average humidity in September in St-Malo?
How much does it rain in St-Malo in September?
When it does not snow in St-Malo?
What is the month with the warmest sea water in St-Malo?
What is the sea water temperature in September in St-Malo?
How many hours of daylight does St-Malo have in September?
What time are sunrise and sunset in September in St-Malo?
How many hours of sunshine does St-Malo have in September?
What is the UV index reading in September in St-Malo?
Average temperature in September
St-Malo, France
- Average high temperature in September: 20°C
The warmest month (with the highest average high temperature) is August (22°C).
The month with the lowest average high temperature is January (8.8°C).
- Average low temperature in September: 11.7°C
The month with the highest average low temperature is August (13.6°C).
The coldest month (with the lowest average low temperature) is February (3.1°C).
Average humidity in September
St-Malo, France
- Average humidity in September: 82%
The months with the highest relative humidity are October and December (85%).
The months with the lowest relative humidity are March, April and May (79%).
Average rainfall in September
St-Malo, France
- Average rainfall in September: 62.2mm
The wettest months (with the highest rainfall) are October and November (86.8mm).
The driest month (with the least rainfall) is June (49.1mm).
Average rainfall days in September
St-Malo, France
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is November (13.8 days).
The month with the least rainy days is July (7.6 days).
Average snowfall days in September
St-Malo, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
St-Malo, France
- Average sea temperature in September: 18.2°C
The best month for swimming (with the highest average sea temperature) is September (18.2°C).
The coldest month (with the lowest average sea temperature) is February (8.7°C).
Average daylight in September /
Average sunshine in September
St-Malo, France
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 5h and 4min
The month with the most sunshine is June (Average sunshine: 6h and 54min).
The month with the least sunshine is December (Average sunshine: 2h and 6min).
Average UV index in September
St-Malo, France
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, November and December (UV index 1).
St-Malo, France
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