Riverside weather by month
Measured at Riverside/March ARB
Averages and records for each calendar month at Riverside/March ARB, United States, from 1949 to 2026. The warmest month is August, averaging 34.3°C; the coolest is January at 17.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 17.5°C | 3.2°C | 30.0°C4 January 2012 | −7.8°C14 January 1963 | 36 / 37 |
| February | 18.7°C | 4.2°C | 31.1°C27 February 2026 | −7.1°C5 February 2020 | 36 / 36 |
| March | 20.1°C | 5.4°C | 37.8°C20 March 2026 | −3.9°C30 March 1967 | 36 / 37 |
| April | 23.0°C | 7.4°C | 36.1°C3 April 1961 | −2.8°C29 April 1970 | 37 / 37 |
| May | 25.2°C | 10.3°C | 39.4°C21 May 1967 | 0.6°C1 May 1967 | 37 / 37 |
| June | 29.7°C | 13.1°C | 43.9°C20 June 2016 | 5.0°C1 June 1967 | 36 / 37 |
| July | 34.2°C | 16.6°C | 44.4°C6 July 2018 | 9.4°C13 July 1966 | 36 / 37 |
| August | 34.3°C | 16.9°C | 43.3°C15 August 2020 | 10.0°C6 August 1950 | 37 / 37 |
| September | 32.0°C | 14.8°C | 46.7°C6 September 2020 | 6.1°C24 September 2017 | 36 / 38 |
| October | 27.5°C | 10.4°C | 42.2°C2 October 2024 | 1.1°C29 October 2019 | 37 / 37 |
| November | 22.3°C | 6.2°C | 33.9°C4 November 2020 | −3.3°C17 November 1958 | 37 / 37 |
| December | 18.4°C | 3.6°C | 32.2°C10 December 1950 | −8.3°C21 December 1968 | 36 / 37 |
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 36 to 37 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.