San Diego Intl Arpt climate by month
Averages and records for each calendar month at San Diego Intl Arpt, United States, from 1939 to 2026. The warmest month is August, averaging 25.2°C; the coolest is January at 18.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 18.7°C | 9.2°C | 31.1°C10 January 1953 | −1.7°C4 January 1949 | 87 / 87 |
| February | 18.9°C | 10.1°C | 32.8°C12 February 2022 | 2.2°C15 February 1942 | 87 / 87 |
| March | 19.2°C | 11.5°C | 33.9°C17 March 1978 | 3.9°C2 March 1971 | 87 / 87 |
| April | 20.2°C | 13.1°C | 36.7°C6 April 1989 | 5.0°C3 April 1945 | 87 / 87 |
| May | 20.7°C | 14.9°C | 36.1°C15 May 2014 | 8.9°C5 May 1950 | 87 / 87 |
| June | 22.0°C | 16.4°C | 38.3°C10 June 1979 | 10.0°C14 June 1943 | 87 / 87 |
| July | 24.2°C | 18.4°C | 37.2°C22 July 2006 | 12.8°C5 July 1948 | 88 / 88 |
| August | 25.2°C | 19.2°C | 36.7°C31 August 1955 | 13.9°C7 August 1944 | 88 / 88 |
| September | 25.0°C | 18.4°C | 43.9°C26 September 1963 | 10.6°C26 September 1948 | 87 / 88 |
| October | 23.4°C | 15.7°C | 41.7°C14 October 1961 | 6.1°C30 October 1971 | 87 / 87 |
| November | 21.4°C | 11.9°C | 37.8°C4 November 2010 | 3.3°C15 November 1964 | 87 / 87 |
| December | 19.0°C | 9.4°C | 31.1°C29 December 1963 | 1.1°C8 December 1978 | 87 / 87 |
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 87 to 88 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.