AI-generatedRennes at a glance
- Best time
- May – Sep
- Warmest month
- Aug · 23°
- Sunshine a year
- 1,760 h
- Rain a year
- 702 mm
- Climate
- Maritime
- Time zone
- UTC+1 / UTC+2
- Elevation
- 39 m
Climate in Rennes
Rennes has a maritime climate with moderate summers and cool, often grey winters. August is the warmest month with average highs of 23 °C, while January is the coolest at 8 °C. With around 1,760 hours of sunshine a year, Rennes is moderately sunny; June is the sunniest month with 7.1 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Fair
Best time to visit: May – September
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 11°
- Midday, 13:00: about 16°
- Afternoon, 16:00: about 17°
- Evening, 20:00: about 14°
- Night, 23:00: about 13°
08:2419:20
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 08:05–09:07 · evening 18:38–19:40
- Blue hour
- Morning 07:53–08:05 · evening 19:40–19:52
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Rennes in October?
In October, Rennes is mild: daytime highs average 17 °C, and nights cool down to about 10 °C. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 12 rainy days and 74 mm in total. All in all, October is a so-so month for a holiday in Rennes.
More details for October
- Daylight
- 10 h 56 min08:24 – 19:20
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 69 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 50 %87 %
- Sunshineweight 20 %12 %
- Few rainy daysweight 30 %44 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Sunshine hours in Rennes
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 3.7 of 10.9 hours of daylight in Rennes, 34 % of the day.
Sunshine hours: measured at the weather station 6 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Rennes
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 2 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 8).
Minutes until sunburn in October
- Very fair skin
- about 55 min
- Fair skin
- about 65 min
- Light brown skin
- about 95 min
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Rennes: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Rennes has about 12 rainy days with 74 mm of rain in total.
Wind and clouds in Rennes
How breezy and how cloudy Rennes is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Rennes typically peaks at 19 km/h during the day: Beaufort 3, light breeze.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 69 % of the sky over Rennes: mostly cloudy, with about 3.7 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Rennes
How often the day gets hot in Rennes (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Rennes has about 0 hot days, with an average daytime high of 17 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Rennes
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
CoolOctober: nights around 10°. A duvet at night and a jumper for the evening.
The coolest nights are in January (3°), the warmest in August (14°). Nights fall below 8 °C on average from November to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 15 | 8° | 3° | 2.2 h | 12 | 65 |
| FebruaryFeb | 26 | 10° | 3° | 3.3 h | 10 | 52 |
| MarchMar | 40 | 12° | 5° | 4.3 h | 11 | 55 |
| AprilApr | 61 | 15° | 6° | 5.8 h | 10 | 57 |
| MayMay | 76 | 18° | 10° | 6.5 h | 11 | 61 |
| JuneJun | 83 | 22° | 13° | 7.1 h | 9 | 55 |
| JulyJul | 84 | 23° | 14° | 7.1 h | 8 | 51 |
| AugustAug | 84 | 23° | 14° | 6.7 h | 8 | 46 |
| SeptemberSep | 81 | 21° | 12° | 6.0 h | 8 | 45 |
| OctoberOct | 59 | 17° | 10° | 3.7 h | 12 | 74 |
| NovemberNov | 34 | 12° | 6° | 2.8 h | 12 | 68 |
| DecemberDec | 17 | 9° | 4° | 2.2 h | 12 | 73 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
48.11° N, 1.67° W · 39 m · Europe/Paris
Best time to visit Rennes
The best time to visit Rennes is from May to September. For sightseeing, day trips and hiking, conditions are most comfortable from April to October. Rain is most frequent in December; the wettest month is October with 74 mm.
Rennes through the seasons
How the weather changes over the seasons, with averages for each.
Rennes in spring
Mar – May
Fair
- 12–18 °C by day
- 6 h of sun a day
- 33 rainy days in all
Rennes in summer
Jun – Aug
Excellent
- 22–23 °C by day
- 7 h of sun a day
- 26 rainy days in all
Rennes in autumn
Sep – Nov
Fair
- 12–21 °C by day
- 4 h of sun a day
- 32 rainy days in all
Rennes in winter
Dec – Feb
Poor
- 8–10 °C by day
- 3 h of sun a day
- 34 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Rennes for you.
Your best months: June – August
Based on the climate averages; tap a month to see its details.
Compare two months in Rennes
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Rennes: score 84 against 59. In July, days are 6 °C warmer than in October. July has 4 fewer rainy days. The sun shines 3 hours longer a day in July.
| Month | October | July |
|---|---|---|
| Weather score | 59 | 84better |
| Day high | 17° | 23° |
| Night low | 10° | 14° |
| Sunshine | 3.7 h | 7.1 hbetter |
| Rainy days | 12 | 8better |
| Rainfall | 74 mm | 51 mmbetter |
| Muggy days | 0better | 1 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – Oct
15–28 °C and not too much rain
Rainy months
Dec
12 or more rainy days
Rennes month by month
The typical weather for every month at a glance.
15January8° · 2 h
In January, Rennes is cold: daytime highs average 8 °C, and nights cool down to about 3 °C. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 12 rainy days and 65 mm in total. All in all, January is not an ideal month for a holiday in Rennes.
Rennes in January26February10° · 3 h
In February, Rennes is cold: daytime highs average 10 °C, and nights cool down to about 3 °C. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 10 rainy days and 52 mm in total. All in all, February is not an ideal month for a holiday in Rennes.
Rennes in February40March12° · 4 h
In March, Rennes is cool: daytime highs average 12 °C, and nights cool down to about 5 °C. Expect around 4 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 55 mm in total. All in all, March is a so-so month for a holiday in Rennes.
Rennes in March61April15° · 6 h
In April, Rennes is cool: daytime highs average 15 °C, and nights cool down to about 6 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 57 mm in total. All in all, April is a good month for a holiday in Rennes.
Rennes in April76May18° · 7 h
In May, Rennes is mild: daytime highs average 18 °C, and nights cool down to about 10 °C. The sun shines for around 7 hours a day. Rain is frequent, with about 11 rainy days and 61 mm in total. All in all, May is a good month for a holiday in Rennes.
Rennes in May83June22° · 7 h
In June, Rennes is warm: daytime highs average 22 °C, and nights cool down to about 13 °C. The sun shines for around 7 hours a day. Rain is frequent, with about 9 rainy days and 55 mm in total. All in all, June is an excellent month for a holiday in Rennes.
Rennes in June84July23° · 7 h
In July, Rennes is warm: daytime highs average 23 °C, and nights cool down to about 14 °C. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 51 mm. All in all, July is an excellent month for a holiday in Rennes.
Rennes in July84August23° · 7 h
In August, Rennes is warm: daytime highs average 23 °C, and nights cool down to about 14 °C. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 46 mm. All in all, August is an excellent month for a holiday in Rennes.
Rennes in August81September21° · 6 h
In September, Rennes is mild: daytime highs average 21 °C, and nights cool down to about 12 °C. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 45 mm. All in all, September is an excellent month for a holiday in Rennes.
Rennes in September59October17° · 4 h
In October, Rennes is mild: daytime highs average 17 °C, and nights cool down to about 10 °C. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 12 rainy days and 74 mm in total. All in all, October is a so-so month for a holiday in Rennes.
Rennes in October34November12° · 3 h
In November, Rennes is cool: daytime highs average 12 °C, and nights cool down to about 6 °C. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 12 rainy days and 68 mm in total. All in all, November is not an ideal month for a holiday in Rennes.
Rennes in November17December9° · 2 h
In December, Rennes is cold: daytime highs average 9 °C, and nights cool down to about 4 °C. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 12 rainy days and 73 mm in total. All in all, December is not an ideal month for a holiday in Rennes.
Rennes in DecemberRennes compared
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Rennes vs. Saint-Malo
In October the holiday weather in Rennes and Saint-Malo is about equally good (score 59 vs. 56). During the day Saint-Malo is 1 °C cooler than Rennes.
| in October | Rennes | Saint-Malo |
|---|---|---|
| Holiday score | 59 | 56 |
| Daytime high | 17° | 16° |
| Sea | – | 16° |
| Sunshine | 4 h | 4 h |
| Rainy days | 12 | 12 |
| Best time | May – Sep | Jul – Aug |
Through the year
France in October: the best places
In October, Rennes ranks 9 among the 31 nearest destinations in this country.
- Poitiers18°66
- 2Oradour-sur-Glane17°66
- 3Angers17°65
- 4Tours18°65
- 5Fontainebleau17°65
- 6Nantes17°63
- 7Orléans17°62
- 8Le Mans17°60
- 9RennesThis page17°59
Planning a trip to Rennes
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Rennes in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Rennes has its best school-holiday weather during the summer holidays (score 84) and its weakest during the Christmas holidays (score 16).
- 55
Easter holidays
Mar – Apr
Fair
- 14 °C by day
- 5.4 h of sun a day
- 11 rainy days a month
- 77
May half-term
May – Jun
Good
- 19 °C by day
- 6.6 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 84
Summer holidays
Jul – Aug
ExcellentBest holidays
- 23 °C by day
- 6.8 h of sun a day
- 8 rainy days a month
Good for: Sightseeing & walks
- 59
October half-term
Oct
Fair
- 17 °C by day
- 3.7 h of sun a day
- 12 rainy days a month
Good for: Sightseeing & walks
- 16
Christmas holidays
Dec – Jan
Poor
- 9 °C by day
- 2.2 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- Short trip – train or car is often quicker
- Distance
- 380 km
- Time zone
- UTC+2
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Rennes
When is the best time to visit Rennes?
The best time to visit Rennes is from May to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Rennes?
August is the warmest month, with average highs of 23 °C and nights around 14 °C. January is the coolest month at 8 °C.
When does it rain most in Rennes?
Rain is most frequent in December; the wettest month is October with 74 mm. The driest month is September with 45 mm.
How many hours of sunshine does Rennes get?
Rennes gets around 1,760 hours of sunshine a year. The sunniest month is June with 7.1 hours a day; in January there are 2.2 hours a day.
What time zone is Rennes in?
Rennes uses the time zone Europe/Paris: UTC+1 in January and UTC+2 in July.
Which school holidays are best for Rennes?
Rennes has its best school-holiday weather during the summer holidays (score 84) and its weakest during the Christmas holidays (score 16). Holiday ratings (0–100): Easter holidays 55, May half-term 77, Summer holidays 84, October half-term 59, Christmas holidays 16.
Near Rennes
Other destinations close by.
Places with a climate like Rennes
Destinations whose weather through the year is closest to Rennes's – good alternatives.