Earliest and Latest Days of 30° C in Oshawa

This is a list of the earliest and latest days in the year with a high temperature of at least 30 °C in Oshawa, Ontario history. It is based on NOAA data from the years 1882–2024.

Also see:

Earliest 30 degree day in Oshawa?

The earliest in the year that Oshawa, Ontario had a high temperature of at least 30 °C is May 21 which has happened twice, most recently in 2021.

Latest 30 degree day in Oshawa?

The latest in the year that Oshawa, Ontario had a high temperature of at least 30 °C is September 25 which happened in 2017.

Earliest Days ≥ 30 °C

Date	Year	Temperature
May 21	2021	30.4 °C
May 21	1975	30.0 °C
May 23	1975	30.0 °C
May 26	2020	31.0 °C
May 27	1923	35.0 °C
May 28	2018	30.7 °C
May 28	1977	30.5 °C
May 29	1986	31.0 °C
May 30	1988	32.0 °C
May 31	2022	30.5 °C
May 31	1988	30.0 °C
June 1	2023	30.4 °C
June 1	1923	32.2 °C
June 2	2023	31.6 °C
June 4	1925	30.0 °C
June 5	2021	31.8 °C
June 5	1925	32.8 °C
June 6	2005	30.0 °C
June 6	1925	32.8 °C
June 7	2005	30.0 °C
June 7	1925	32.8 °C
June 7	1884	30.0 °C

Latest Days ≥ 30 °C

Date	Year	Temperature
September 25	2017	30.8 °C
September 24	2017	31.6 °C
September 11	1925	31.1 °C
September 10	1983	31.5 °C
September 10	1884	30.0 °C
September 8	2016	30.2 °C
September 8	2002	30.0 °C
September 7	2016	30.9 °C
September 7	2015	31.6 °C
September 7	1884	30.0 °C
September 6	2023	30.4 °C
September 6	1998	30.0 °C
September 6	1978	30.0 °C
September 5	2023	30.5 °C
September 5	2018	31.7 °C
September 5	1985	30.0 °C
September 4	2023	30.3 °C
September 4	1973	30.0 °C
September 4	1953	32.2 °C
September 4	1923	30.0 °C