Highest Daily Low Temperatures in San Luis Obispo History

This is a list of the hottest daily low temperatures ever recorded in San Luis Obispo, California history from 1893–2024 based on data from the NOAA.

Highest temperatures all-time

Record for the highest daily low temperature in San Luis Obispo

The highest low temperature for a calendar day in San Luis Obispo, California history was 75 °F which happened on Friday, September 22, 1939.

Rank	Temperature	Date
1	75 °F	September 22, 1939
2	74 °F	October 5, 1987
2	74 °F	September 23, 1939
4	72 °F	September 21, 1939
4	72 °F	September 20, 1939
6	71 °F	September 3, 2017
6	71 °F	September 11, 1983
6	71 °F	September 25, 1978
9	70 °F	August 19, 2020
9	70 °F	September 2, 2017
9	70 °F	November 2, 1997
9	70 °F	September 9, 1984
9	70 °F	October 7, 1951
9	70 °F	September 24, 1939
15	69 °F	September 5, 2022
15	69 °F	July 1, 1991
15	69 °F	June 15, 1981
15	69 °F	August 29, 1977
15	69 °F	October 15, 1967
15	69 °F	October 30, 1955
15	69 °F	September 4, 1950
15	69 °F	October 29, 1939
15	69 °F	October 11, 1939
15	69 °F	April 18, 1938
15	69 °F	June 20, 1929