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).
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]