California · county records since 1895, through September 2026.
Weather › California › Riverside County
Riverside County is in extreme drought: NOAA's Palmer reading for September was -4.3. Every one of the last 12 months ran warmer than usual there.
That is the 1991 to 2020 average for these dates in Riverside County. The Weather Service forecast fills in below.
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Each bar is a month's average temperature against the usual for that month (1991 to 2020). Ranks compare the same month in every year since 1895.
Rain and melted snow against the usual for each month. The drought reading is NOAA's Palmer index for the county.
| Month | Usual high / low | Usual rain | Warmest | Coldest |
|---|---|---|---|---|
| January | 65° / 42° | 1.6 in | 59.2° 2003 | 39.0° 1937 |
| February | 67° / 44° | 1.8 in | 61.6° 2015 | 47.0° 1939 |
| March | 73° / 48° | 1.1 in | 72.1° 2026 | 51.8° 1952 |
| April | 79° / 52° | 0.4 in | 71.1° 1989 | 55.1° 1967 |
| May | 86° / 59° | 0.1 in | 78.9° 1997 | 64.7° 1917 |
| June | 96° / 66° | 0.0 in | 86.0° 2021 | 73.1° 1944 |
| July | 101° / 73° | 0.2 in | 91.9° 2024 | 81.4° 1912 |
| August | 101° / 73° | 0.3 in | 91.4° 2026 | 79.4° 1899 |
| September | 95° / 67° | 0.3 in | 84.9° 2020 | 71.9° 1900 |
| October | 84° / 57° | 0.3 in | 76.2° 2003 | 62.2° 1916 |
| November | 73° / 47° | 0.5 in | 66.0° 2021 | 52.2° 1994 |
| December | 63° / 41° | 1.2 in | 59.1° 2025 | 46.6° 1909 |
Warmest and coldest are the month's whole-month average temperature, with the year it happened.
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