Rennes/St Jacques Arpt climate by month
Averages and records for each calendar month at Rennes/St Jacques Arpt, France, from 1945 to 2026. The warmest month is July, averaging 24.3°C; the coolest is January at 8.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 8.5°C | 2.4°C | 16.8°C27 January 2003 | −14.7°C17 January 1985 | 82 / 82 |
| February | 9.7°C | 2.7°C | 20.9°C27 February 2019 | −11.2°C22 February 1948 | 82 / 82 |
| March | 12.7°C | 4.0°C | 24.1°C30 March 2021 | −7.3°C1 March 2005 | 82 / 82 |
| April | 15.4°C | 5.6°C | 28.7°C17 April 1945 | −3.2°C3 April 1984 | 82 / 82 |
| May | 18.8°C | 8.7°C | 33.5°C26 May 2026 | −1.2°C1 May 1945 | 82 / 82 |
| June | 22.1°C | 11.5°C | 41.5°C23 June 2026 | 2.2°C2 June 1962 | 82 / 82 |
| July | 24.3°C | 13.3°C | 40.5°C18 July 2022 | 5.5°C8 July 1954 | 82 / 82 |
| August | 24.0°C | 13.2°C | 40.2°C13 August 2026 | 4.0°C30 August 1956 | 82 / 82 |
| September | 21.4°C | 11.3°C | 35.1°C9 September 2023 | 1.9°C30 September 1972 | 81 / 81 |
| October | 17.0°C | 8.6°C | 30.0°C2 October 2011 | −4.6°C29 October 1947 | 81 / 81 |
| November | 12.0°C | 5.2°C | 21.4°C7 November 2015 | −7.5°C28 November 1955 | 81 / 81 |
| December | 9.3°C | 3.3°C | 18.0°C31 December 2022 | −12.6°C29 December 1964 | 81 / 81 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 81 to 82 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.