San Diego/Brown Fld climate by month
Averages and records for each calendar month at San Diego/Brown Fld, United States, from 1997 to 2026. The warmest month is August, averaging 27.2°C; the coolest is February at 19.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 19.7°C | 6.7°C | 32.2°C6 January 2006 | −2.7°C14 January 2007 | 29 / 29 |
| February | 19.3°C | 7.1°C | 33.9°C22 February 2002 | 0.0°C1 February 2002 | 29 / 30 |
| March | 20.0°C | 8.4°C | 36.1°C20 March 1997 | 1.7°C1 March 1997 | 29 / 30 |
| April | 21.2°C | 10.0°C | 37.2°C8 April 2022 | 1.1°C10 April 1999 | 29 / 30 |
| May | 22.0°C | 12.6°C | 38.9°C15 May 2014 | 5.0°C1 May 1999 | 30 / 30 |
| June | 23.7°C | 14.7°C | 39.4°C27 June 2006 | 6.7°C5 June 1999 | 30 / 30 |
| July | 26.1°C | 16.7°C | 43.3°C22 July 2006 | 11.7°C3 July 2020 | 30 / 30 |
| August | 27.2°C | 17.3°C | 38.9°C27 August 2009 | 11.1°C31 August 2010 | 30 / 30 |
| September | 27.0°C | 16.3°C | 42.2°C27 September 2010 | 8.9°C30 September 2019 | 29 / 30 |
| October | 25.1°C | 13.1°C | 39.4°C24 October 2017 | 3.3°C27 October 2020 | 29 / 29 |
| November | 22.5°C | 9.3°C | 37.2°C3 November 2010 | 0.0°C30 November 2004 | 29 / 29 |
| December | 19.5°C | 6.7°C | 30.6°C21 December 2005 | −0.5°C23 December 2011 | 29 / 29 |
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 29 to 30 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.