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Climate guideThirty-year normals for Rennes
Rennes climate by month
Oceanic · CfbBest Jun–Jul · Sep
Annual mean12°day and night
Seasonal swing13°warmest vs coolest
Precipitation760 mm147 wet days a year
48.11° N, 1.67° WElevation 39 mUTC+1 · Central European Standard Time
When to goRennes · weather score
Best timeJun–Jul · Sep
October: high / low17° / 9°
iSummary
What the weather is like
Rennes has an oceanic climate (Köppen Cfb): rain spread through the year and no real dry season.
The warmest month is July, when afternoons average 25° and nights 13°. January is the coolest month, with highs of 9° and lows of 3°. The difference between the warmest and the coolest month is about 13°.
About 760 mm of precipitation falls in an average year. January is the wettest month (74 mm, 15 wet days) and September the driest (65 mm, 9 wet days). Cloud cover ranges from 34% in August to 51% in January.
Compared with Paris, the capital, Rennes is 1.1° cooler on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 25° · July
- Coldest nights
- 3° · February
- Wettest month
- January
- Driest month
- September
- Clearest skies
- August · 34% cloud
- Longest day
- 16 h 02 min
- Shortest day
- 8 h 23 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 9° | 10° | 13° | 16° | 19° | 23° | 25° | 25° | 22° | 17° | 12° | 9° |
| Average low | 3° | 3° | 4° | 6° | 9° | 12° | 13° | 13° | 11° | 9° | 6° | 3° |
| Precipitation | 74 mm | 55 mm | 57 mm | 53 mm | 74 mm | 48 mm | 54 mm | 42 mm | 65 mm | 81 mm | 76 mm | 81 mm |
| Wet days (≥1 mm) | 15.2 | 11.6 | 12.6 | 10.8 | 12.2 | 10.3 | 10.7 | 10.7 | 8.6 | 14.6 | 15.1 | 14.8 |
| Cloud cover | 51% | 47% | 45% | 42% | 41% | 37% | 35% | 34% | 37% | 44% | 47% | 50% |
| Daylight | 8h 47 | 10h 14 | 11h 50 | 13h 38 | 15h 10 | 16h 02 | 15h 41 | 14h 21 | 12h 38 | 10h 54 | 9h 17 | 8h 23 |
| Month score | 16 | 24 | 38 | 60 | 67 | 73 | 73 | 73 | 77 | 57 | 31 | 17 |
ivMonth by month
Rennes in every month
January16
9° / 3°
74 mm · 15.2 wet days
February24
10° / 3°
55 mm · 11.6 wet days
March38
13° / 4°
57 mm · 12.6 wet days
April60
16° / 6°
53 mm · 10.8 wet days
May67
19° / 9°
74 mm · 12.2 wet days
June73
23° / 12°
48 mm · 10.3 wet days
July73
25° / 13°
54 mm · 10.7 wet days
August73
25° / 13°
42 mm · 10.7 wet days
September77
22° / 11°
65 mm · 8.6 wet days
October57
17° / 9°
81 mm · 14.6 wet days
November31
12° / 6°
76 mm · 15.1 wet days
December17
9° / 3°
81 mm · 14.8 wet days