Earliest and Latest Days of 100° F in Sioux City

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Sioux City, Iowa history. It is based on NOAA data from the years 1948–2024.

Also see:

Earliest 100 degree day in Sioux City?

The earliest in the year that Sioux City, Iowa had a high temperature of at least 100 °F is May 14 which happened in 2013.

Latest 100 degree day in Sioux City?

The latest in the year that Sioux City, Iowa had a high temperature of at least 100 °F is September 7 which happened in 1971.

Earliest Days ≥ 100 °F

Date	Year	Temperature
May 14	2013	106 °F
May 15	2001	101 °F
May 25	1967	102 °F
May 27	2018	102 °F
June 6	2011	100 °F
June 8	1985	103 °F
June 8	1972	100 °F
June 9	2006	100 °F
June 13	1956	100 °F
June 13	1952	101 °F
June 15	1952	101 °F
June 18	1953	105 °F
June 19	1988	103 °F
June 20	1988	102 °F
June 20	1974	101 °F
June 21	1988	108 °F
June 21	1956	100 °F
June 24	1988	104 °F
June 24	1954	101 °F
June 26	1971	100 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
September 7	1971	101 °F
September 6	1976	102 °F
September 2	2023	102 °F
September 2	2000	103 °F
August 30	2012	102 °F
August 30	2000	101 °F
August 29	2012	101 °F
August 27	1955	104 °F
August 26	1976	100 °F
August 26	1956	100 °F
August 26	1955	104 °F
August 25	1955	102 °F
August 24	2023	100 °F
August 24	1955	102 °F
August 23	2023	102 °F
August 23	1948	100 °F
August 22	2023	101 °F
August 18	1983	100 °F
August 17	1988	102 °F
August 16	1988	101 °F
August 16	1983	100 °F