Weather in Rennes

Stay informed about the current weather conditions in Rennes. In this section, you will find fresh data, detailed forecasts, and visual weather charts to help you plan your visit.

The climate in Rennes, located in France, can be described as temperate maritime. The city experiences a change of four distinct seasons, each with its own characteristics. This means the weather here changes throughout the year, offering diverse conditions for visitors, but without extreme temperature fluctuations.

Winters in Rennes are usually mild, with average January temperatures around 6.2°C, and although frosts occur, severe cold is rare. Summers, conversely, are warm and pleasant, with an average temperature in July and August of around 19°C, while maximum values reach 23-24°C. Spring and autumn are classic transitional seasons with comfortable temperatures that gradually rise in spring and fall in autumn.

One notable feature of the weather in Rennes is the high frequency of rainy days throughout the year. However, according to available climate data, the total monthly rainfall is recorded as low (on average 2-3 mm). The highest number of days with precipitation is observed in March and December (15 days each), and the lowest in July (9 days). This means that despite the small total amount of recorded precipitation, the likelihood of encountering overcast weather or light rain exists almost always. Therefore, tourists are advised to be prepared for changeable weather and to carry an umbrella or light waterproof clothing.

The climate in Rennes is characterised by moderate temperatures throughout the year, without sharp extremes. The coldest months are traditionally January, with an average temperature of around 6.2°C (minimum 3.6°C, maximum 8.8°C), and December, where the average temperature is 7.2°C (minimum 4.9°C, maximum 9.6°C). Winters here are generally mild, without severe frosts, but with a noticeable chill, especially during the night and morning hours.

The summer period in Rennes brings pleasant warmth. The warmest months are considered to be July, with an average temperature of 19.0°C (minimum 14.3°C, maximum 23.7°C), and August, with an average temperature of 18.8°C (minimum 14.3°C, maximum 23.4°C). June is also quite warm, with an average temperature of 17.5°C. Summer days are usually comfortably warm, while evenings can be slightly cooler, creating pleasant conditions for walks. The difference between day and night temperatures in the summer months is about 9-10°C, which is a moderate fluctuation.

Spring and autumn in Rennes represent transitional seasons with gradual temperature changes. In March, the average temperature rises to 8.7°C, and by May it reaches 13.9°C. In autumn, warmth persists in September (average 16.7°C), but by November the temperature drops to 9.2°C. During these periods, fluctuations between day and night temperatures are also observed, but they are generally not as pronounced as in summer.

In Rennes, precipitation falls quite evenly throughout the year, judging by the provided monthly average data on total amounts. Most months receive about 2 mm of precipitation, with a slight increase to 3 mm in June, October, November, and December. This suggests the absence of a clearly defined rainy season or dry period in terms of the total volume of falling moisture.

Nevertheless, the frequency of rainy days in Rennes varies. The highest number of days with precipitation usually falls in March and December, when there are on average about 15 such days. The "driest" month in terms of the number of rainy days is July, where precipitation is recorded on approximately 9 days. It is followed by August with 10 rainy days. This indicates that mid-summer offers more rain-free days, while early spring and the beginning of winter can be more overcast.

Given the small total amount of precipitation distributed over a significant number of rainy days (from 9 to 15 per month), it can be assumed that Rennes is characterised more by light rains or drizzle than by heavy downpours. Although the provided data does not indicate snowfall, with average minimum temperatures around 3.6°C in January, snow is theoretically possible during the coldest winter periods, but is likely not a frequent occurrence. Overall, travellers should be prepared for the possibility of rain at any time of the year, although its intensity, according to the provided data, is usually low.

When planning a trip to Rennes, it is important to consider its temperate maritime climate, characterised by frequent, though usually not very heavy, precipitation throughout the year. Therefore, your indispensable companion will be an umbrella or a light waterproof jacket, as the number of rainy days here is significant in almost any season. The foundation of your wardrobe should be comfortable walking shoes, as Rennes is perfect for long walks. Dressing in layers will also be very useful, allowing you to easily adapt to changeable weather and different temperatures throughout the day.

In the cold season, from December to February, when the average temperature holds around 6-7°C and the maximum rarely exceeds 10°C, be sure to take a warm jacket or coat, sweaters, a scarf, gloves, and a hat. In spring (March-May) and autumn (September-November), the weather becomes milder, with average temperatures from 8°C to 17°C, but still requires a mid-weight jacket (such as a windbreaker or trench coat), cardigans, or fleece tops, which are easy to combine. Do not forget about rain protection during these periods as well, as the number of rainy days remains significant.

The summer months, from June to August, are quite comfortable in Rennes, with an average temperature of around 17-19°C and daily highs in the region of 22-24°C. For this time, light trousers or shorts, t-shirts, dresses, and sandals are suitable. However, even in summer, the evenings can be cool, so a light jumper, cardigan, or blazer will not go amiss. Sunscreen and sunglasses will also be useful for clear days. And, of course, despite it being summer, a compact umbrella or light raincoat is always worth having on hand in case of the short-term rain characteristic of Rennes, as even in July and August there are 9-10 rainy days.