San Diego/North Island NAS climate by month
Averages and records for each calendar month at San Diego/North Island NAS, United States, from 1945 to 2026. The warmest month is August, averaging 24.3°C; the coolest is January at 18.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 18.0°C | 9.4°C | 31.7°C12 January 1986 | −1.1°C4 January 1949 | 76 / 78 |
| February | 18.2°C | 10.2°C | 32.8°C12 February 2022 | 1.1°C15 February 1990 | 76 / 78 |
| March | 18.5°C | 11.6°C | 33.3°C12 March 2007 | 4.4°C2 March 2023 | 77 / 78 |
| April | 19.4°C | 13.1°C | 34.4°C12 April 2008 | 6.7°C3 April 1945 | 79 / 79 |
| May | 19.9°C | 14.9°C | 32.2°C4 May 2004 | 8.3°C5 May 1960 | 77 / 79 |
| June | 21.1°C | 16.4°C | 32.8°C26 June 1976 | 12.2°C3 June 1945 | 77 / 78 |
| July | 23.3°C | 18.4°C | 34.4°C30 July 1980 | 13.9°C9 July 1948 | 79 / 79 |
| August | 24.3°C | 19.2°C | 35.0°C28 August 2009 | 13.9°C25 August 1975 | 78 / 79 |
| September | 24.2°C | 18.4°C | 38.9°C27 September 2010 | 12.2°C26 September 1948 | 77 / 79 |
| October | 22.7°C | 15.7°C | 38.3°C24 October 2017 | 5.6°C30 October 1971 | 75 / 78 |
| November | 20.6°C | 12.1°C | 37.2°C4 November 2010 | 4.4°C15 November 1964 | 78 / 78 |
| December | 18.2°C | 9.6°C | 31.1°C16 December 2013 | 1.1°C27 December 2015 | 78 / 78 |
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 75 to 79 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.