San Jose Intl Arpt climate by month
Averages and records for each calendar month at San Jose Intl Arpt, United States, from 1893 to 2026. The warmest month is July, averaging 27.5°C; the coolest is January at 14.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 14.4°C | 4.6°C | 26.1°C8 January 1962 | −7.8°C6 January 1894 | 109 / 112 |
| February | 16.6°C | 6.1°C | 27.2°C17 February 1930 | −4.4°C11 February 1894 | 104 / 112 |
| March | 18.5°C | 7.0°C | 31.1°C17 March 1914 | −3.9°C15 March 1895 | 112 / 113 |
| April | 20.8°C | 8.0°C | 35.0°C9 April 1989 | −3.3°C5 April 1895 | 108 / 113 |
| May | 23.1°C | 9.8°C | 38.9°C30 May 1910 | 0.0°C16 May 1894 | 112 / 113 |
| June | 25.8°C | 11.7°C | 42.8°C14 June 2000 | 0.6°C19 June 1893 | 110 / 114 |
| July | 27.5°C | 13.0°C | 42.2°C7 July 1905 | 4.4°C24 July 1893 | 113 / 115 |
| August | 27.2°C | 13.0°C | 40.6°C1 August 1993 | 3.9°C26 August 1893 | 110 / 113 |
| September | 26.6°C | 12.2°C | 41.1°C7 September 1904 | 1.7°C30 September 1893 | 108 / 113 |
| October | 23.4°C | 10.1°C | 41.1°C2 October 2024 | −1.1°C18 October 1893 | 105 / 107 |
| November | 18.6°C | 6.9°C | 29.4°C4 November 1921 | −5.6°C20 November 1893 | 107 / 109 |
| December | 14.6°C | 4.8°C | 26.1°C12 December 1958 | −7.2°C22 December 1990 | 107 / 109 |
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 104 to 113 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.