Earliest and Latest Days of 100° F in Tucson

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Tucson, Arizona history. It is based on NOAA data from the years 1894–2024.

Also see:

Earliest 100 degree day in Tucson?

The earliest in the year that Tucson, Arizona had a high temperature of at least 100 °F is April 19 which happened in 1989.

Latest 100 degree day in Tucson?

The latest in the year that Tucson, Arizona had a high temperature of at least 100 °F is October 20 which happened in 2023.

Earliest Days ≥ 100 °F

Date	Year	Temperature
April 19	1989	101 °F
April 20	1989	104 °F
April 21	1989	104 °F
April 22	2012	101 °F
April 23	2012	100 °F
April 26	2022	100 °F
April 27	1992	101 °F
April 27	1910	100 °F
April 28	1992	101 °F
April 29	2020	102 °F
April 29	1992	102 °F
April 30	2023	100 °F
April 30	2020	101 °F
April 30	1992	100 °F
April 30	1943	102 °F
May 1	2020	100 °F
May 2	1943	100 °F
May 4	2017	100 °F
May 5	2020	101 °F
May 5	2017	104 °F
May 5	1989	101 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
October 20	2023	101 °F
October 19	2023	100 °F
October 16	2023	101 °F
October 16	2020	101 °F
October 16	1991	100 °F
October 9	1996	100 °F
October 8	1991	100 °F
October 8	1917	100 °F
October 8	1910	101 °F
October 7	2020	101 °F
October 7	1991	100 °F
October 7	1987	101 °F
October 7	1934	100 °F
October 7	1928	100 °F
October 6	2023	101 °F
October 6	2020	100 °F
October 6	1991	100 °F
October 6	1987	101 °F
October 6	1934	101 °F
October 6	1929	101 °F
October 6	1928	101 °F
October 6	1917	100 °F