Earliest and Latest Days of 100° F in Vacaville

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

Also see:

Earliest 100 degree day in Vacaville?

The earliest in the year that Vacaville, California had a high temperature of at least 100 °F is May 7 which happened in 1987.

Latest 100 degree day in Vacaville?

The latest in the year that Vacaville, California had a high temperature of at least 100 °F is October 10 which happened in 1991.

Earliest Days ≥ 100 °F

Date	Year	Temperature
May 7	1987	100 °F
May 10	1934	104 °F
May 11	1934	103 °F
May 13	1976	101 °F
May 14	1927	100 °F
May 15	2008	100 °F
May 15	1927	101 °F
May 16	2009	101 °F
May 16	2008	103 °F
May 16	1970	100 °F
May 17	2009	103 °F
May 17	2008	105 °F
May 17	1997	102 °F
May 18	2022	101 °F
May 18	2008	100 °F
May 18	1997	102 °F
May 19	2001	101 °F
May 19	1947	100 °F
May 20	2001	102 °F
May 20	1947	104 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
October 10	1991	101 °F
October 7	1996	100 °F
October 6	1933	100 °F
October 5	1943	100 °F
October 5	1933	105 °F
October 4	1991	101 °F
October 4	1980	101 °F
October 4	1947	100 °F
October 4	1933	104 °F
October 3	1991	102 °F
October 3	1980	100 °F
October 3	1933	106 °F
October 2	2001	102 °F
October 2	1980	101 °F
October 2	1958	100 °F
October 2	1952	102 °F
October 2	1933	107 °F
October 1	2001	104 °F
October 1	1980	100 °F
October 1	1970	100 °F
October 1	1963	100 °F
October 1	1958	100 °F
October 1	1952	102 °F
October 1	1933	103 °F