Earliest and Latest Days of 100° F in Riverside

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Riverside, California history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 100 degree day in Riverside?

The earliest in the year that Riverside, California had a high temperature of at least 100 °F is January 27 which happened in 2003.

Latest 100 degree day in Riverside?

The latest in the year that Riverside, California had a high temperature of at least 100 °F is November 3 which happened in 2010.

Earliest Days ≥ 100 °F

Date	Year	Temperature
January 27	2003	101 °F
March 10	1916	102 °F
March 11	1916	100 °F
April 3	1961	100 °F
April 5	1989	103 °F
April 6	1989	105 °F
April 7	1989	103 °F
April 8	2022	100 °F
April 8	1989	103 °F
April 13	1985	100 °F
April 14	1940	100 °F
April 19	1914	100 °F
April 20	2009	101 °F
April 21	2009	101 °F
April 22	1910	100 °F
April 23	1910	103 °F
April 24	1910	102 °F
April 26	2004	102 °F
April 27	2004	101 °F
April 28	1921	101 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
November 3	2010	100 °F
October 31	1918	100 °F
October 28	1915	105 °F
October 26	1915	100 °F
October 25	1926	101 °F
October 24	1990	100 °F
October 24	1909	101 °F
October 23	2017	102 °F
October 23	1959	101 °F
October 23	1939	100 °F
October 22	1937	100 °F
October 22	1917	103 °F
October 21	2003	103 °F
October 21	1917	101 °F
October 21	1915	100 °F
October 20	2003	101 °F
October 20	1940	104 °F
October 20	1921	100 °F
October 19	1991	101 °F
October 19	1940	104 °F
October 19	1921	106 °F
October 19	1915	102 °F