Hayward Muni climate by month
Averages and records for each calendar month at Hayward Muni, United States, from 1996 to 2026. The warmest month is July, averaging 26.9°C; the coolest is January at −5.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −5.4°C | −16.1°C | 10.6°C8 January 2003 | −39.0°C24 January 2026 | 30 / 30 |
| February | −2.6°C | −15.4°C | 15.6°C29 February 2000 | −38.8°C15 February 2021 | 30 / 30 |
| March | 4.6°C | −8.1°C | 27.2°C26 March 2007 | −34.3°C3 March 2014 | 30 / 30 |
| April | 12.0°C | −1.4°C | 30.0°C29 April 2007 | −18.8°C8 April 2018 | 30 / 30 |
| May | 19.6°C | 4.7°C | 36.7°C28 May 2006 | −8.3°C3 May 2005 | 29 / 30 |
| June | 24.4°C | 10.2°C | 35.6°C29 June 2018 | −2.2°C1 June 2003 | 29 / 30 |
| July | 26.9°C | 12.6°C | 40.6°C15 July 2006 | 1.7°C7 July 1997 | 31 / 31 |
| August | 25.5°C | 11.4°C | 37.8°C8 August 2005 | 0.0°C21 August 2004 | 31 / 31 |
| September | 21.3°C | 7.6°C | 35.0°C4 September 2023 | −5.6°C24 September 2000 | 30 / 31 |
| October | 13.3°C | 1.5°C | 30.0°C1 October 2023 | −12.7°C27 October 2020 | 30 / 30 |
| November | 4.8°C | −4.9°C | 22.8°C4 November 2020 | −25.5°C21 November 2014 | 29 / 30 |
| December | −2.9°C | −12.5°C | 15.0°C2 December 1998 | −35.6°C26 December 1996 | 29 / 30 |
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 31 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.