Modesto weather by month
Measured at Modesto/Sham Fld
Averages and records for each calendar month at Modesto/Sham Fld, United States, from 1927 to 2026. The warmest month is July, averaging 34.7°C; the coolest is January at 12.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 12.5°C | 3.3°C | 23.9°C17 January 1998 | −7.8°C11 January 1949 | 99 / 99 |
| February | 16.3°C | 4.9°C | 26.7°C27 February 1992 | −4.4°C10 February 1929 | 99 / 99 |
| March | 19.5°C | 6.5°C | 32.8°C18 March 2026 | −2.8°C2 March 1971 | 97 / 99 |
| April | 23.1°C | 8.4°C | 37.8°C30 April 1981 | −1.1°C7 April 1929 | 99 / 99 |
| May | 27.4°C | 11.2°C | 41.7°C17 May 2009 | 0.0°C5 May 1959 | 100 / 100 |
| June | 31.6°C | 14.0°C | 44.4°C15 June 1961 | 3.9°C7 June 1950 | 100 / 100 |
| July | 34.7°C | 15.9°C | 45.0°C23 July 2006 | 7.8°C8 July 1935 | 100 / 100 |
| August | 33.6°C | 15.4°C | 43.9°C16 August 2020 | 7.8°C30 August 1957 | 98 / 98 |
| September | 31.1°C | 13.6°C | 44.4°C6 September 2022 | 4.4°C26 September 1948 | 99 / 100 |
| October | 25.7°C | 10.0°C | 40.0°C2 October 2024 | −1.7°C31 October 1935 | 99 / 99 |
| November | 18.2°C | 5.5°C | 31.1°C2 November 1997 | −3.9°C17 November 1961 | 98 / 98 |
| December | 12.6°C | 3.3°C | 23.9°C1 December 1977 | −7.8°C13 December 1932 | 99 / 99 |
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 97 to 100 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.