September weather forecast and climate
Rennes, France

Weather in September

The first month of the autumn, September, is also an agreeable month in Rennes, France, with average temperature varying between 20.8°C (69.4°F) and 10.8°C (51.4°F).

Temperature

In September, the average high-temperature is almost the same as in August - a pleasant 20.8°C (69.4°F). The average low-temperature, in Rennes, is 10.8°C (51.4°F).

Humidity

Months with the lowest humidity in Rennes are July through September, with an average relative humidity of 78%.

Rainfall

September is the month with the least rainfall. Rain falls for 8.4 days and accumulates 12mm (0.47") of precipitation.

Snowfall

In Rennes, France, snow does not fall in May through October.

Daylight

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

Sunshine

In September, the average sunshine is 7.5h.

UV index

In Rennes, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the least humid month in Rennes?

Months with the lowest humidity in Rennes are July through September, with an average relative humidity of 78%.

What is the average humidity in September in Rennes?

In Rennes, France, the average relative humidity in September is 78%.

What is the driest month in Rennes?

September is the month with the least rainfall. Rain falls for 8.4 days and accumulates 12mm (0.47") of precipitation.

How much does it rain in Rennes in September?

In Rennes, in September, during 8.4 rainfall days, 12mm (0.47") of precipitation is typically accumulated.

When it does not snow in Rennes?

May through October are months without snowfall in Rennes, France.

How many hours of daylight does Rennes have in September?

In Rennes, France, the average length of the day in September is 12.6h.

How long on average sun shines in September in Rennes?

The average sunshine in September in Rennes is 7.5h.

What is the UV index intensity in September in Rennes?

In Rennes, France, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Rennes, France

Average temperature in September - Rennes, France
  • Average high temperature in September: 20.8°C

The warmest month (with the highest average high temperature) is August (23.1°C).
The month with the lowest average high temperature is January (8.4°C).

  • Average low temperature in September: 10.8°C

The month with the highest average low temperature is July (12.8°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).

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Average pressure in September
Rennes, France

Average pressure in September - Rennes, France
  • Average pressure in September: 1018.3mbar

The month with the highest atmospheric pressure is December (1018.4mbar).
The month with the lowest atmospheric pressure is November (1012.9mbar).

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Average wind speed in September
Rennes, France

Average wind speed in September - Rennes, France
  • Average wind speed in September: 12.1km/h

The windiest month (with the highest average wind speed) is February (17.6km/h).
The calmest month (with the lowest average wind speed) is August (11.7km/h).

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Average humidity in September
Rennes, France

Average humidity in September - Rennes, France
  • Average humidity in September: 78%

The month with the highest relative humidity is December (88%).
Months with the lowest relative humidity are July, August and September (78%).

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Average rainfall in September
Rennes, France

Average rainfall in September - Rennes, France
  • Average rainfall in September: 12mm

The wettest month (with the highest rainfall) is June (39mm).
The driest month (with the least rainfall) is September (12mm).

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Average rainfall days in September
Rennes, France

Average rainfall days in September - Rennes, France
  • Average rainfall days in September: 8.4 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is September (8.4 days).

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Average snowfall in September
Rennes, France

Average snowfall in September - Rennes, France
  • Average snowfall in September: 0mm

Months with the highest snowfall are February, March, April and December (2mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in September
Rennes, France

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

The month with the highest number of snowfall days is February (0.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Rennes, France

Average daylight in September / Average sunshine in September - Rennes, 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: 8.5h).

  • Average sunshine in September: 7.5h

The month with the most sunshine is July (Average sunshine: 9.7h).
The month with the least sunshine is January (Average sunshine: 4.2h).

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Average sunshine days in September
Rennes, France

Average sunshine days in September - Rennes, France
  • Average sunshine days in September: 18.5 days

The month with the most sunshine days is September (18.5 days).
The month with the least sunshine days is May (12.1 days).

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Average UV index in September
Rennes, France

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

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Rennes, France

Average cloud cover in September - Rennes, France
  • Average cloud cover in September: 41

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 41).

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Average visibility in September
Rennes, France

Average visibility in September - Rennes, France
  • Average visibility in September: 8km

Months with the highest visibility are January, February, March, April, June, July, October, November and December (9km).
Months with the lowest visibility are May, August and September (8km).

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