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St. Catharines August Weather

Averages and records for weather in St. Catharines, Ontario in the month of August.

Typical St. Catharines August Weather 1991–2020
Average daily high	25.6 °C
Average daily low	18.3 °C
Average monthly precipitation	5.5 cm
Daily chance of precipitation	29.3%

St. Catharines August Weather Records 1882–2024
Highest temperature	38.3 °C	August 27, 1948
Lowest temperature	4.0 °C	August 29, 1982
Highest daily low	26.5 °C	August 14, 1988
Lowest daily high	13.9 °C	August 30, 1935
Hottest average high temperature	29.6 °C	1947
Coldest average high temperature	23.1 °C	1927
Most daily precipitation	6.9 cm	August 10, 1938
Most monthly precipitation	17.3 cm	1954

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
August 1	26.1	18.7	36.1	7.8
August 2	26.1	18.7	35.6	7.8
August 3	26.1	18.7	36.7	7.8
August 4	26.0	18.7	35.0	10.6
August 5	26.0	18.6	35.6	8.9
August 6	25.9	18.6	35.0	10.0
August 7	25.9	18.6	36.7	7.8
August 8	25.9	18.5	35.1	8.9
August 9	25.8	18.5	36.7	9.4
August 10	25.8	18.5	35.0	7.8
August 11	25.8	18.4	35.6	10.0
August 12	25.7	18.4	33.9	8.9
August 13	25.7	18.4	35.0	8.3
August 14	25.7	18.4	35.0	8.3
August 15	25.6	18.4	34.4	8.9
August 16	25.5	18.3	34.4	8.5
August 17	25.4	18.2	33.9	7.8
August 18	25.3	18.2	32.8	8.3
August 19	25.3	18.1	35.0	8.3
August 20	25.3	18.1	33.9	7.5
August 21	25.2	18.0	35.0	6.7
August 22	25.1	18.0	31.1	7.5
August 23	25.1	17.9	32.8	5.6
August 24	25.0	17.9	33.9	5.6
August 25	24.9	17.8	36.7	6.7
August 26	24.8	17.7	37.8	6.7
August 27	24.7	17.6	38.3	7.8
August 28	24.5	17.5	36.7	7.2
August 29	24.5	17.4	33.9	4.0
August 30	24.4	17.3	34.4	4.4
August 31	24.3	17.2	33.9	6.7

Weather Station Details

Years	Station	Coordinates
1995–2024	Port Weller (AUT)	location
1882–1994	St Catherines	location