Earliest and Latest Days of 90° F in Riverside

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Riverside, California history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 90 degree day in Riverside?

The earliest in the year that Riverside, California had a high temperature of at least 90 °F is January 1 which happened in 1918.

Latest 90 degree day in Riverside?

The latest in the year that Riverside, California had a high temperature of at least 90 °F is December 31 which happened in 1917.

Earliest Days ≥ 90 °F

Date	Year	Temperature
January 1	1918	92 °F
January 8	1923	94 °F
January 9	1923	92 °F
January 18	1971	90 °F
January 19	1971	90 °F
January 27	2003	101 °F
January 28	2003	93 °F
January 30	2003	95 °F
January 31	2003	93 °F
February 10	2016	90 °F
February 11	1907	90 °F
February 13	1924	90 °F
February 14	1991	91 °F
February 15	1991	91 °F
February 15	1943	91 °F
February 15	1916	91 °F
February 16	2016	91 °F
February 16	1977	90 °F
February 17	1930	91 °F
February 18	1981	90 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
December 31	1917	91 °F
December 29	1917	90 °F
December 21	1917	90 °F
December 19	1917	90 °F
December 11	1958	90 °F
December 9	1938	91 °F
December 7	1938	90 °F
December 6	1938	90 °F
December 5	1939	90 °F
December 3	1958	94 °F
November 29	1916	90 °F
November 27	2014	91 °F
November 26	2014	90 °F
November 26	1933	92 °F
November 25	1977	92 °F
November 25	1933	94 °F
November 24	1995	92 °F
November 24	1959	90 °F
November 24	1894	90 °F
November 23	2017	94 °F
November 23	1995	91 °F