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Rennes, Brittany climate
Cfb Oceanic / temperate
Rennes has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 77°F, while the coldest is January averaging around 38°F at night. Precipitation is fairly even year-round, totalling about 27 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsRennes climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 48 | 50 | 56 | 61 | 67 | 73 | 77 | 77 | 71 | 63 | 55 | 49 |
| Avg temp (°F) | 43 | 44 | 48 | 52 | 58 | 63 | 67 | 67 | 62 | 56 | 49 | 44 |
| Avg low (°F) | 38 | 37 | 40 | 43 | 49 | 54 | 57 | 57 | 52 | 49 | 43 | 39 |
| Precipitation (in) | 2.6 | 2.0 | 1.9 | 2.0 | 2.3 | 2.0 | 1.7 | 1.7 | 2.2 | 2.9 | 2.9 | 2.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 48 | 50 | 56 | 61 | 67 | 73 |
| Avg temp (°F) | 43 | 44 | 48 | 52 | 58 | 63 |
| Avg low (°F) | 38 | 37 | 40 | 43 | 49 | 54 |
| Precipitation (in) | 2.6 | 2.0 | 1.9 | 2.0 | 2.3 | 2.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 77 | 77 | 71 | 63 | 55 | 49 |
| Avg temp (°F) | 67 | 67 | 62 | 56 | 49 | 44 |
| Avg low (°F) | 57 | 57 | 52 | 49 | 43 | 39 |
| Precipitation (in) | 1.7 | 1.7 | 2.2 | 2.9 | 2.9 | 2.9 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 15 | 14 | 14 | 14 | 12 | 13 | 15 | 16 | 18 | 18 | 17 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.9 | 1 | 1 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | 8 | 8 | 4 | 1 | 0.0 | — | — | — | — | 0.3 | 3 | 8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 15 | 14 | 14 | 14 | 12 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.9 |
| Days with low ≤ 32°F (days) | 8 | 8 | 4 | 1 | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 15 | 16 | 18 | 18 | 17 |
| Days with high ≥ 90°F (days) | 1 | 1 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | — | 0.3 | 3 | 8 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 69 | 68 | 66 | 68 | 66 | 62 | 62 | 60 | 68 | 70 | 70 |
| Clear days (≤ 30% cloud) | 2 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 6 | 3 | 2 | 3 |
| Partly cloudy days (30–70%) | 10 | 9 | 9 | 9 | 9 | 10 | 11 | 12 | 11 | 11 | 11 | 10 |
| Cloudy days (≥ 70%) | 18 | 16 | 18 | 16 | 18 | 17 | 15 | 14 | 13 | 17 | 17 | 18 |
| Relative humidity (%) | 92 | 88 | 84 | 80 | 78 | 76 | 74 | 74 | 77 | 85 | 90 | 93 |
| Wind speed (mph) | 7.7 | 7.5 | 7.2 | 6.8 | 6.6 | 6.3 | 6.2 | 5.9 | 6.1 | 6.7 | 7.0 | 7.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 69 | 68 | 66 | 68 | 66 |
| Clear days (≤ 30% cloud) | 2 | 3 | 4 | 4 | 4 | 4 |
| Partly cloudy days (30–70%) | 10 | 9 | 9 | 9 | 9 | 10 |
| Cloudy days (≥ 70%) | 18 | 16 | 18 | 16 | 18 | 17 |
| Relative humidity (%) | 92 | 88 | 84 | 80 | 78 | 76 |
| Wind speed (mph) | 7.7 | 7.5 | 7.2 | 6.8 | 6.6 | 6.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 62 | 60 | 68 | 70 | 70 |
| Clear days (≤ 30% cloud) | 5 | 5 | 6 | 3 | 2 | 3 |
| Partly cloudy days (30–70%) | 11 | 12 | 11 | 11 | 11 | 10 |
| Cloudy days (≥ 70%) | 15 | 14 | 13 | 17 | 17 | 18 |
| Relative humidity (%) | 74 | 74 | 77 | 85 | 90 | 93 |
| Wind speed (mph) | 6.2 | 5.9 | 6.1 | 6.7 | 7.0 | 7.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Rennes-st Jacques, a weather station, about 6 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.