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Contents
- The climate of Rennes
- The best time to visit Rennes
- The worst time to visit Rennes
- Spring weather in Rennes
- Summer weather in Rennes
- Autumn weather in Rennes
- Winter weather in Rennes
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Rennes
Rennes, the capital city of Brittany, France, is categorized under the Köppen climate classification as Cfb. This essentially points to a Marine west coast climate with warm summers. There is a significant shift in climate throughout the year, suggesting diverse weather conditions across the span of 12 months.
Monthly temperature averages range between 2.6°C (36.7°F) recorded as the lowest in January, to highs of 23.1°C (73.6°F) in July. Temperature variations remain consistent with a gradual increase in warmth from Spring leading to hotter months in summer, which then slowly recede to colder conditions entering into fall, and eventually winter. Relative humidity levels maintain an 80% range, slightly higher during the colder months of December and January at 88% and 87%.
Rainfall patterns differ across the year, with the least amount of rainfall, averaging 12mm (0.47"), observed in September. Conversely, June records the most significant amount of rainfall recording an average of 39mm (1.54"). It's key to note that approximated snowfall measurements live between 1 to 2mm (0.08") from January to December, with an absence of snowfall from May to September. Rennes experiences long daylight hours during the summer months, with June having the longest at 16 hours daily.
Wind speeds vary between 11.7km/h (7.3mph) in August to a peak of 17.6km/h (10.9mph) in February. The highest gust speed is noted during February, with a value rounded to 29.2km/h (18.1mph).
Monthly temperature averages range between 2.6°C (36.7°F) recorded as the lowest in January, to highs of 23.1°C (73.6°F) in July. Temperature variations remain consistent with a gradual increase in warmth from Spring leading to hotter months in summer, which then slowly recede to colder conditions entering into fall, and eventually winter. Relative humidity levels maintain an 80% range, slightly higher during the colder months of December and January at 88% and 87%.
Rainfall patterns differ across the year, with the least amount of rainfall, averaging 12mm (0.47"), observed in September. Conversely, June records the most significant amount of rainfall recording an average of 39mm (1.54"). It's key to note that approximated snowfall measurements live between 1 to 2mm (0.08") from January to December, with an absence of snowfall from May to September. Rennes experiences long daylight hours during the summer months, with June having the longest at 16 hours daily.
Wind speeds vary between 11.7km/h (7.3mph) in August to a peak of 17.6km/h (10.9mph) in February. The highest gust speed is noted during February, with a value rounded to 29.2km/h (18.1mph).
The best time to visit Rennes
The ideal time to visit Rennes would be during the warm summers, from June to August, where the temperatures range from 20.7°C (69.3°F) to 23.1°C (73.6°F). These sun-drenched months offer around 16 hours of daylight and high sunshine hours per day, 9.5 hours in June and 9.7 hours in July, ideal for outdoor activities and city exploration. Rainfall is relatively high, but with averages below 40mm (1.57"), it rarely disrupts plans.
The worst time to visit Rennes
Winter months, specifically December and January, could potentially pose challenges for visitors due to the cold temperatures, high humidity, and reduced sunlight hours. Average low temperatures dip down to 2.6°C (36.7°F) and 4.2°C (39.6°F), respectively. Despite the rainfalls not being at their maximum records, the low temperatures can potentially turn these into snowy conditions.
Spring weather in Rennes
Spring in Rennes unfolds with gradually rising temperatures from a low of 2.3°C (36.1°F) in February to a comfortable 15.2°C (59.4°F) by May. This period sees a reduction in the relative humidity with decreasing rates from 85% in February to 83% in May. Rainfall also decreases during this time from 25mm (0.98") in February to 20mm (0.79") in March however, with a slight increase to 33mm (1.3") by May.
Summer weather in Rennes
The summer months in Rennes are warm and comfortable. The temperatures oscillate from 17.4°C (63.3°F) in May to 23.1°C (73.6°F) in July and returns at 20.8°C (69.4°F) in September. The city enjoys long daylight hours of up to 16 hours during June and July with sunshine duration ranging from 8.1 hours in May to 9.7 hours in July. Rainfall, although high, only reaches its maxima of 39mm (1.54") in June.
Autumn weather in Rennes
Autumn in Rennes experiences a gradual decrease in temperatures starting from 20.8°C (69.4°F) in September to 11.9°C (53.4°F) in November. There is a significant drop in rainfall from 30mm (1.18") in October to a yearly low of 12mm (0.47") in September, providing clear skies for most parts of the season. Relative humidity begins to rise again during this period, from 78% in September to 87% in November.
Winter weather in Rennes
Winters in Rennes can be quite cold with temperatures ranging from a low of 4.2°C (39.6°F) in December to a high of 9.1°C (48.4°F) in both December and February. The winter period sees a slight increase in precipitation, recording 34mm (1.34") both in December and January and a reduced daylight duration of around 8.5 hours in December. The cold winds reach speeds up to 16.8km/h (10.4mph), with gust wind speeds scaling up to 29km/h (18mph) in December.
Weather in January
The new year in Rennes, France, begins with a relatively mild but damp climate. The temperatures see a modest peak at about 8.4°C (47.1°F), while the minimum temperature reaches a chilly 2.6°C (36.7°F). Adequate rainfalls display a significant role, with 27mm (1.06") of rain distributed over nearly half the days. Weather in January »
Weather in February
Transitioning towards spring, February features marginally elevated temperatures compared to January. With 9.1°C (48.4°F) as the maximum and 2.3°C (36.1°F) at the lowest, the climate has a subtle frosty feel. However, the 25mm (0.98") of accumulated precipitation, including around 2mm (0.08") of snowfall, asserts the presence of winter. Weather in February »
Weather in March
The arrival of March, an introductory phase to spring, brings a significant contrast in weather. Compared to February's chilliness, the temperatures hit a pleasant maximum of 12.1°C (53.8°F), signaling a warm transition. Although the average low rests at 3.6°C (38.5°F), rainfall substantially reduces to 20mm (0.79"), marking the end of the wet winters. Weather in March »
Weather in April
April in Rennes, France provides a distinct touch of spring. There is a steep increase in temperatures, marking a peak at 15.2°C (59.4°F), while the lower limits reach 5.2°C (41.4°F). Conversely, this month sees a surge in rainfall with an accumulation of 33mm (1.3"), the fourth-highest throughout the year. Weather in April »
Weather in May
May establishes the real advent of spring, with significantly improved temperatures and extended daylight hours. The temperatures do not drop below 8°C (46.4°F), and the highs reach a peak around 17.4°C (63.3°F). However, 30mm (1.18") precipitation occurs in May, continuing the trend of increasing rainfall from April. Weather in May »
Weather in June
Embracing the start of summer, June sees substantial weather changes, such as extended sunlight hours. The rise in the mercury column from May is noticeable with a maximum temperature reaching 20.7°C (69.3°F). A total of 39mm (1.54") of rainfall, the maximum for a year, balances the peak summertime, providing a respite from the sunny weather. Weather in June »
Weather in July
As the heart of summer, July presents the highest temperatures registered in Rennes, France, an average peak at 23°C (73.4°F). The city enjoys 15.6 hours of daylight that complements summer's spirit perfectly. With less humidity and reduced rainfall of 21mm (0.83") compared to June, weather conditions stabilize, encouraging outdoor activities. Weather in July »
Weather in August
August is the continuation of the peak summer season, displaying consistency in temperatures with a peak at 23.1°C (73.6°F) and a minimum around 12.6°C (54.7°F). Despite a slight decrease in daylight duration from July to 14.3 hours, summer continues to dominate. Weather in August »
Weather in September
September marks the arrival of autumn in Rennes, France, with noticeable changes in weather patterns and temperatures. The mercury column displays a drop with maximum temperatures hovering around 20.8°C (69.4°F) on average. Weather in September »
Weather in October
October displays definitive signs of autumn, with consistent decreases in temperatures and daylight hours. The temperature peaks at 16.9°C (62.4°F), almost 4°C (39.2°F) below the September level, indicating the increasing presence of autumn. Weather in October »
Weather in November
November witnesses winter's introduction in Rennes, France, with substantial decreases in temperatures and sunlight duration. The maximum temperatures fall below 16.9°C (62.4°F), averaging around 11.9°C (53.4°F), while a recorded 1mm (0.04") of snowfall attests to winter's arrival. Weather in November »
Weather in December
The year ends in Rennes, France, amid a colder climate and shorter days, asserting the dominance of winter. The temperature tops out at 9.1°C (48.4°F), and the lower limit freezes at 4.2°C (39.6°F), while the snowfall is at its peak with 2mm (0.08") recorded. Weather in December »
[Resources]Frequently asked questions
What month is the coldest in Rennes?
The month of January, characterized by an average high of 8.4°C (47.1°F) and a low of 2.6°C (36.7°F), is recognized as the coldest in Rennes.
How much does it rain in Rennes?
Throughout the year, there are 150.1 rainfall days, and 330mm (12.99") of precipitation is accumulated.
When does it snow in Rennes?
Months with snowfall are January through April, November and December.
How much does it snow in Rennes?
In Rennes, during the entire year, snow falls for 2.8 days and aggregates up to 10mm (0.39") of snow.
What is the month with the least sunshine in Rennes?
With an average of 4.2h of sunshine, January has the least sunshine of the year.
When is the lowest UV index in Rennes?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rennes, France.
When does it snow the most in Rennes?
The months with the most snowfall in Rennes, France, are February through April and December, with an average 2mm (0.08") of accumulated snow.
When it does not snow in Rennes?
May through October are months without snowfall in Rennes.
What is the rainiest month in Rennes?
The month with the most rainfall in Rennes, France, is June, when the rain falls for 14.4 days and typically aggregates up to 39mm (1.54") of precipitation.
When are the longest days in Rennes?
The month with the longest days in Rennes, France, is June, with an average of 16h and 0min of daylight.
What is the month with the highest UV index in Rennes?
June through August, with an average maximum UV index of 5, are months with the highest UV index.
What are the least humid months in Rennes?
July through September, with an average relative humidity of 78%, are the least humid months in Rennes, France.
What month has the most sunshine in Rennes?
The month with the most sunshine in Rennes is July, with an average of 9.7h of sunshine.
What month is the hottest in Rennes?
August is the warmest month of the year in Rennes, France, registering average temperatures as high as 23.1°C (73.6°F) and as low as 12.6°C (54.7°F).
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.
When is Daylight Saving Time (DST) in Rennes?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends in Rennes, France, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
What is the most humid month in Rennes?
With an average relative humidity of 88%, December is the most humid month.
What is the month with the shortest days in Rennes?
December has the shortest days of the year in Rennes, France, with an average of 8h and 24min of daylight.
Average temperature
Rennes, France
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).
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).
Average pressure
Rennes, France
- Average pressure in January:
1017.6mbar - Average pressure in February:
1016.4mbar - Average pressure in March:
1016.6mbar - Average pressure in April:
1015.7mbar - Average pressure in May:
1017.3mbar - Average pressure in June:
1016.9mbar
- Average pressure in July:
1017.2mbar - Average pressure in August:
1017.1mbar - Average pressure in September:
1018.3mbar - Average pressure in October:
1016.5mbar - Average pressure in November:
1012.9mbar - Average pressure in December:
1018.4mbar
The month with the highest atmospheric pressure is December (1018.4mbar).
The month with the lowest atmospheric pressure is November (1012.9mbar).
Average wind speed
Rennes, France
- Average wind speed in January:
16.8km/h - Average wind speed in February:
17.6km/h - Average wind speed in March:
16.1km/h - Average wind speed in April:
13.6km/h - Average wind speed in May:
13.2km/h - Average wind speed in June:
12.6km/h
- Average wind speed in July:
12.3km/h - Average wind speed in August:
11.7km/h - Average wind speed in September:
12.1km/h - Average wind speed in October:
13.7km/h - Average wind speed in November:
16.1km/h - Average wind speed in December:
16.8km/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).
Average humidity
Rennes, France
The month with the highest relative humidity is December (88%).
The months with the lowest relative humidity are July, August and September (78%).
Average rainfall
Rennes, France
The wettest month (with the highest rainfall) is June (39mm).
The driest month (with the least rainfall) is September (12mm).
Average rainfall days
Rennes, France
- Average rainfall days in January:
13.3 days - Average rainfall days in February:
11 days - Average rainfall days in March:
13.6 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
14.4 days
- Average rainfall days in July:
12.8 days - Average rainfall days in August:
11.5 days - Average rainfall days in September:
8.4 days - Average rainfall days in October:
11.3 days - Average rainfall days in November:
12.5 days - Average rainfall days in December:
12.2 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).
Average snowfall
Rennes, France
The months with the highest snowfall are February, March, April and December (2mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days
Rennes, France
- Average snowfall days in January:
0.7 days - Average snowfall days in February:
0.8 days - Average snowfall days in March:
0.3 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.2 days - Average snowfall days in December:
0.5 days
The month with the highest number of snowfall days is February (0.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Rennes, France
- Average daylight in January:
8h and 5min - Average daylight in February:
10h and 1min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 1min - Average daylight in June:
16h and 0min
- Average daylight in July:
15h and 4min - Average daylight in August:
14h and 2min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 2min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
5h and 4min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 1min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
8h and 1min - Average sunshine in September:
7h and 3min - Average sunshine in October:
6h and 2min - Average sunshine in November:
4h and 2min - Average sunshine in December:
4h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Rennes, France
- Average sunshine days in January:
13.5 days - Average sunshine days in February:
14.5 days - Average sunshine days in March:
14.9 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
12.8 days
- Average sunshine days in July:
13.7 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
18.5 days - Average sunshine days in October:
16.9 days - Average sunshine days in November:
13.2 days - Average sunshine days in December:
15.9 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).
Average UV index
Rennes, France
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Rennes, France
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 41).
Average visibility
Rennes, France
The months with the highest visibility are January, February, March, April, June, July, October, November and December (9km).
The months with the lowest visibility are May, August and September (8km).
Rennes, France
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