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Cornwall August Weather

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

Typical Cornwall August Weather 1991–2020
Average daily high	26.2 °C
Average daily low	16.1 °C
Average monthly precipitation	8.6 cm
Average monthly snow	none
Daily chance of precipitation	34.9%
Daily chance of snow	0%

Cornwall August Weather Records 1867–2024
Highest temperature	36.5 °C	August 8, 2001
Lowest temperature	1.7 °C	August 28, 1957
Highest daily low	26.0 °C	August 5, 2012
Lowest daily high	13.0 °C	August 30, 1985
Hottest average high temperature	29.3 °C	2001
Coldest average high temperature	22.8 °C	1982
Most daily precipitation	8.2 cm	August 31, 2005
Most monthly precipitation	19.1 cm	1955
Most daily snow	none	-
Most monthly snow	none	-

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	27.1	16.9	35.6	4.4
August 2	27.1	16.9	35.0	3.3
August 3	27.1	16.9	35.0	5.6
August 4	27.0	16.8	35.5	7.8
August 5	27.0	16.8	35.0	2.8
August 6	26.9	16.7	35.0	5.0
August 7	26.9	16.6	34.5	5.0
August 8	26.8	16.6	36.5	7.2
August 9	26.7	16.5	35.0	6.1
August 10	26.7	16.5	33.0	6.7
August 11	26.6	16.4	34.0	7.2
August 12	26.6	16.3	33.5	7.8
August 13	26.5	16.3	33.5	6.7
August 14	26.5	16.3	36.0	8.3
August 15	26.4	16.2	33.0	3.3
August 16	26.2	16.1	33.0	4.4
August 17	26.1	16.0	33.5	6.1
August 18	26.0	15.9	33.9	5.0
August 19	25.9	15.7	35.0	5.6
August 20	25.9	15.7	32.0	4.4
August 21	25.8	15.6	34.4	3.9
August 22	25.7	15.5	34.0	1.7
August 23	25.6	15.5	33.3	2.2
August 24	25.6	15.4	31.7	4.4
August 25	25.4	15.3	33.0	4.4
August 26	25.3	15.1	32.0	3.9
August 27	25.2	15.0	32.2	3.9
August 28	25.0	14.8	33.3	1.7
August 29	24.9	14.7	33.3	2.8
August 30	24.7	14.6	32.8	4.4
August 31	24.6	14.4	35.0	3.9

Weather Station Details

Years	Station	Coordinates
1950–2024	Cornwall	location
1867–1887	Cornwall	location