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Ottawa August Weather

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

Typical Ottawa August Weather 1991–2020
Average daily high	25.7 °C
Average daily low	14.8 °C
Average monthly precipitation	8.7 cm
Average monthly snow	none
Daily chance of precipitation	37.2%
Daily chance of snow	0%

Ottawa August Weather Records 1889–2024
Highest temperature	37.8 °C	August 14, 1944
Lowest temperature	1.7 °C	August 25, 1942
Highest daily low	24.8 °C	August 9, 2001
Lowest daily high	12.8 °C	August 29, 1965
Hottest average high temperature	28.9 °C	2001
Coldest average high temperature	22.2 °C	1912
Most daily precipitation	9.0 cm	August 23, 1943
Most monthly precipitation	23.0 cm	1943
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	26.6	15.7	37.8	4.4
August 2	26.6	15.6	34.4	6.1
August 3	26.6	15.6	34.4	7.2
August 4	26.5	15.6	36.1	7.2
August 5	26.4	15.5	35.0	4.4
August 6	26.4	15.4	35.6	5.0
August 7	26.3	15.3	35.6	6.7
August 8	26.2	15.3	36.3	5.6
August 9	26.2	15.2	37.3	5.6
August 10	26.1	15.2	35.0	8.3
August 11	26.1	15.1	37.2	7.2
August 12	26.0	15.0	34.4	3.3
August 13	26.0	15.0	34.4	2.8
August 14	25.9	14.9	37.8	7.0
August 15	25.8	14.9	36.7	5.0
August 16	25.7	14.8	35.0	3.9
August 17	25.6	14.7	36.1	5.0
August 18	25.5	14.5	35.6	3.3
August 19	25.4	14.4	36.1	3.9
August 20	25.3	14.3	36.7	5.0
August 21	25.3	14.3	35.6	5.0
August 22	25.2	14.2	36.7	3.9
August 23	25.1	14.1	33.3	4.4
August 24	25.0	14.0	34.4	4.4
August 25	24.9	13.9	35.6	1.7
August 26	24.7	13.7	35.0	3.3
August 27	24.6	13.6	34.4	3.3
August 28	24.4	13.4	34.4	2.8
August 29	24.3	13.3	34.4	4.4
August 30	24.2	13.2	35.6	1.7
August 31	24.0	13.1	32.8	1.7

Weather Station Details

Years	Station	Coordinates
1889–2024	Ottawa CDA	location