Earliest and Latest Days of 100° F in Portage

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Portage, Wisconsin history. It is based on NOAA data from the years 1889–2024.

Also see:

Earliest 100 degree day in Portage?

The earliest in the year that Portage, Wisconsin had a high temperature of at least 100 °F is May 31 which happened in 1934.

Latest 100 degree day in Portage?

The latest in the year that Portage, Wisconsin had a high temperature of at least 100 °F is September 6 which happened in 1922.

Earliest Days ≥ 100 °F

Date	Year	Temperature
May 31	1934	102 °F
June 1	1934	101 °F
June 5	1911	100 °F
June 9	1911	101 °F
June 20	1933	101 °F
June 20	1911	101 °F
June 21	1988	101 °F
June 22	1988	101 °F
June 22	1911	103 °F
June 23	1911	104 °F
June 25	1901	100 °F
June 26	1901	102 °F
June 27	1933	101 °F
June 27	1901	101 °F
June 29	1931	101 °F
June 30	1931	102 °F
July 1	1931	101 °F
July 1	1911	100 °F
July 1	1910	100 °F
July 2	1911	104 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
September 6	1922	103 °F
August 24	2023	101 °F
August 18	1988	101 °F
August 17	1988	101 °F
August 16	1937	102 °F
August 6	1918	100 °F
August 3	1988	101 °F
August 2	1988	103 °F
July 31	1999	100 °F
July 31	1917	100 °F
July 30	1916	101 °F
July 29	1941	102 °F
July 29	1916	102 °F
July 28	1916	102 °F
July 27	1916	101 °F
July 24	1934	105 °F
July 24	1901	104 °F
July 23	1934	104 °F
July 23	1901	102 °F
July 22	1901	100 °F