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Ottawa May Weather

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

Typical Ottawa May Weather 1991–2020
Average daily high	19.6 °C
Average daily low	8.3 °C
Average monthly precipitation	8.0 cm
Average monthly snow	0.0 cm
Daily chance of precipitation	43.5%
Daily chance of snow	0.22%

Ottawa May Weather Records 1889–2024
Highest temperature	35.2 °C	May 26, 2010
Lowest temperature	-7.2 °C	May 5, 1907
Highest daily low	21.0 °C	May 26, 2010
Lowest daily high	2.5 °C	May 1, 1978
Hottest average high temperature	24.6 °C	1911
Coldest average high temperature	14.8 °C	1924
Most daily precipitation	7.6 cm	May 17, 1916
Most monthly precipitation	18.6 cm	1986
Most daily snow	19.1 cm	May 4, 1907
Most monthly snow	19.1 cm	1907

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

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
May 1	16.2	5.1	29.0	-5.6
May 2	16.4	5.3	30.0	-5.6
May 3	16.6	5.5	30.6	-2.8
May 4	16.7	5.6	31.7	-4.4
May 5	16.9	5.8	31.7	-7.2
May 6	17.2	5.9	30.0	-2.2
May 7	17.4	6.1	28.5	-5.6
May 8	17.7	6.3	31.7	-3.9
May 9	17.9	6.6	32.8	-2.8
May 10	18.2	6.9	31.1	-7.2
May 11	18.5	7.1	30.6	-3.9
May 12	18.7	7.4	31.1	-2.8
May 13	19.0	7.6	30.0	-1.7
May 14	19.2	7.9	31.0	-5.0
May 15	19.4	8.1	30.6	-1.1
May 16	19.6	8.3	30.9	-3.3
May 17	19.8	8.5	32.8	-5.0
May 18	20.0	8.7	33.3	-2.2
May 19	20.1	8.9	32.8	-1.7
May 20	20.2	9.0	33.3	-1.1
May 21	20.3	9.1	35.0	-2.8
May 22	20.4	9.3	34.4	-2.2
May 23	20.5	9.5	32.2	-1.1
May 24	20.7	9.6	32.1	-2.2
May 25	20.9	9.8	32.3	-3.3
May 26	21.0	10.0	35.2	0.0
May 27	21.2	10.1	35.0	0.0
May 28	21.4	10.4	32.8	0.0
May 29	21.6	10.6	32.5	-1.1
May 30	21.8	10.8	34.4	1.1
May 31	22.0	11.0	32.2	0.6

Weather Station Details

Years	Station	Coordinates
1889–2024	Ottawa CDA	location