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St. Catharines May Weather

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

Typical St. Catharines May Weather 1991–2020
Average daily high	17.1 °C
Average daily low	8.5 °C
Average monthly precipitation	6.9 cm
Daily chance of precipitation	36.1%

St. Catharines May Weather Records 1882–2024
Highest temperature	32.5 °C	May 30, 1987
Lowest temperature	-4.4 °C	May 7, 1974
Highest daily low	24.0 °C	May 29, 1987
Lowest daily high	3.3 °C	May 3, 1935
Hottest average high temperature	23.0 °C	1955
Coldest average high temperature	12.9 °C	1997
Most daily precipitation	5.1 cm	May 16, 1976
Most monthly precipitation	17.0 cm	1883

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	13.9	5.8	30.0	-1.7
May 2	14.1	6.0	28.3	-1.7
May 3	14.2	6.1	29.4	-1.1
May 4	14.3	6.3	30.0	-2.2
May 5	14.5	6.4	30.6	0.0
May 6	14.6	6.6	31.7	-0.6
May 7	14.9	6.7	32.2	-4.4
May 8	15.1	6.9	30.6	-1.1
May 9	15.3	7.1	31.1	-1.1
May 10	15.6	7.3	31.7	-2.8
May 11	15.8	7.5	30.0	-3.3
May 12	16.1	7.7	30.0	-0.6
May 13	16.3	7.9	28.0	-1.0
May 14	16.5	8.1	30.0	-1.1
May 15	16.8	8.3	27.8	-1.1
May 16	17.0	8.5	31.0	-0.6
May 17	17.3	8.7	30.0	-0.6
May 18	17.4	8.9	30.6	-0.6
May 19	17.6	9.1	31.7	-1.1
May 20	17.8	9.3	31.7	0.0
May 21	17.9	9.4	32.0	0.0
May 22	18.1	9.6	31.1	1.1
May 23	18.3	9.8	31.1	-0.6
May 24	18.5	10.0	29.0	0.0
May 25	18.7	10.2	30.0	-1.1
May 26	18.9	10.4	30.6	1.1
May 27	19.2	10.6	30.6	0.0
May 28	19.4	10.8	31.5	2.2
May 29	19.6	11.0	32.5	1.1
May 30	19.8	11.2	32.5	1.7
May 31	20.0	11.5	32.2	2.8

Weather Station Details

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