Earliest and Latest Days of 100° F in San Luis Obispo

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

Also see:

Earliest 100 degree day in San Luis Obispo?

The earliest in the year that San Luis Obispo, California had a high temperature of at least 100 °F is April 7 which happened in 1989.

Latest 100 degree day in San Luis Obispo?

The latest in the year that San Luis Obispo, California had a high temperature of at least 100 °F is October 25 which happened in 2017.

Earliest Days ≥ 100 °F

Date	Year	Temperature
April 7	1989	100 °F
April 8	1989	104 °F
April 20	2009	101 °F
April 26	2004	100 °F
May 14	2014	101 °F
May 15	2014	103 °F
June 5	1981	102 °F
June 9	1990	100 °F
June 16	2021	109 °F
June 16	1981	101 °F
June 17	1981	104 °F
June 18	2008	100 °F
June 20	1973	100 °F
June 20	1929	108 °F
June 21	1973	105 °F
June 21	1929	105 °F
June 24	1976	100 °F
June 25	1993	104 °F
June 25	1976	103 °F
June 26	1976	106 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
October 25	2017	100 °F
October 24	2017	108 °F
October 24	1959	103 °F
October 23	2017	104 °F
October 22	1929	102 °F
October 19	2022	100 °F
October 16	1961	106 °F
October 15	1961	108 °F
October 14	1961	101 °F
October 13	2011	102 °F
October 13	1950	103 °F
October 9	2015	105 °F
October 8	2015	100 °F
October 8	1996	106 °F
October 7	2008	100 °F
October 7	1996	102 °F
October 6	2023	106 °F
October 6	1996	100 °F
October 6	1987	108 °F
October 6	1971	100 °F