Hayward Exec climate by month
Averages and records for each calendar month at Hayward Exec, United States, from 1998 to 2026. The warmest month is September, averaging 24.8°C; the coolest is December at 14.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 15.1°C | 6.3°C | 26.1°C18 January 2021 | −2.2°C15 January 2007 | 28 / 28 |
| February | 16.3°C | 7.2°C | 27.2°C3 February 2018 | 0.6°C27 February 2011 | 28 / 28 |
| March | 17.8°C | 8.5°C | 31.1°C20 March 2026 | 2.2°C8 March 2002 | 27 / 28 |
| April | 18.9°C | 9.7°C | 35.0°C20 April 2009 | 2.2°C9 April 1999 | 28 / 28 |
| May | 20.6°C | 11.6°C | 37.2°C15 May 2008 | 5.0°C11 May 2022 | 28 / 28 |
| June | 22.8°C | 13.1°C | 40.0°C14 June 2000 | 8.3°C5 June 2014 | 28 / 28 |
| July | 23.7°C | 14.3°C | 40.6°C22 July 2006 | 11.7°C4 July 1999 | 28 / 28 |
| August | 24.2°C | 14.9°C | 39.4°C14 August 2020 | 11.7°C11 August 2012 | 28 / 28 |
| September | 24.8°C | 14.5°C | 42.2°C2 September 2017 | 8.3°C29 September 2007 | 27 / 29 |
| October | 22.8°C | 12.3°C | 38.9°C6 October 2024 | 6.1°C31 October 2002 | 27 / 28 |
| November | 18.1°C | 8.7°C | 29.4°C14 November 2008 | 0.6°C25 November 2010 | 28 / 28 |
| December | 14.9°C | 6.4°C | 24.4°C7 December 2020 | −2.8°C23 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 28 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.