San Diego/Montgomery Arpt climate by month
Averages and records for each calendar month at San Diego/Montgomery Arpt, United States, from 1998 to 2026. The warmest month is August, averaging 27.6°C; the coolest is December at 19.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 19.8°C | 7.7°C | 31.1°C31 January 2003 | −1.0°C14 January 2007 | 27 / 28 |
| February | 19.5°C | 8.1°C | 32.8°C22 February 2002 | 0.6°C1 February 2002 | 27 / 29 |
| March | 20.0°C | 9.9°C | 35.0°C20 March 2026 | 1.7°C2 March 2023 | 29 / 29 |
| April | 21.0°C | 11.4°C | 37.8°C20 April 2009 | 2.8°C2 April 1999 | 29 / 29 |
| May | 21.6°C | 13.8°C | 38.9°C3 May 2004 | 6.7°C1 May 1999 | 29 / 29 |
| June | 23.5°C | 15.8°C | 37.8°C20 June 2016 | 8.9°C5 June 1999 | 29 / 29 |
| July | 26.4°C | 18.1°C | 41.1°C22 July 2006 | 13.9°C6 July 2000 | 29 / 29 |
| August | 27.6°C | 18.8°C | 40.6°C29 August 2009 | 12.8°C31 August 2010 | 29 / 29 |
| September | 27.3°C | 17.8°C | 41.7°C27 September 2010 | 11.1°C30 September 2019 | 28 / 29 |
| October | 25.2°C | 14.5°C | 40.6°C24 October 2017 | 6.1°C29 October 2009 | 28 / 28 |
| November | 22.4°C | 10.4°C | 37.2°C22 November 2017 | 1.1°C30 November 2004 | 28 / 28 |
| December | 19.4°C | 7.7°C | 30.0°C12 December 2010 | 0.0°C24 December 1998 | 28 / 28 |
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 27 to 29 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.