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Saint John May Weather

Averages and records for weather in Saint John, New Brunswick in the month of May.

Typical Saint John May Weather 1991–2020
Average daily high	15.3 °C
Average daily low	3.5 °C
Average monthly precipitation	9.7 cm
Average monthly snow	0.8 cm
Daily chance of precipitation	45.3%
Daily chance of snow	0.67%

Saint John May Weather Records 1871–2024
Highest temperature	33.0 °C	May 22, 1992
Lowest temperature	-7.8 °C	May 15, 1947
Highest daily low	13.3 °C	May 9, 1960
Lowest daily high	1.7 °C	May 5, 1871
Hottest average high temperature	18.8 °C	1999
Coldest average high temperature	9.7 °C	1917
Most daily precipitation	8.5 cm	May 3, 1872
Most monthly precipitation	27.9 cm	1979
Most daily snow	10.9 cm	May 11, 1907
Most monthly snow	19.6 cm	1967

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	12.4	1.0	21.8	-5.4
May 2	12.6	1.2	24.2	-5.5
May 3	12.8	1.4	24.4	-3.7
May 4	13.0	1.5	25.6	-6.7
May 5	13.2	1.7	23.9	-3.0
May 6	13.4	1.8	23.1	-5.0
May 7	13.5	2.0	22.9	-4.7
May 8	13.8	2.1	23.9	-5.6
May 9	14.0	2.2	24.0	-4.2
May 10	14.2	2.4	29.4	-3.5
May 11	14.4	2.7	22.8	-3.9
May 12	14.5	2.8	27.3	-3.9
May 13	14.7	3.0	23.3	-2.8
May 14	14.9	3.1	25.6	-3.3
May 15	15.1	3.3	23.1	-7.8
May 16	15.3	3.5	23.4	-3.9
May 17	15.4	3.7	28.6	-2.8
May 18	15.5	3.8	28.5	-3.3
May 19	15.7	3.9	25.7	-2.5
May 20	15.8	4.0	25.2	-1.8
May 21	15.9	4.2	24.2	-4.4
May 22	15.9	4.3	33.0	-3.3
May 23	16.0	4.4	29.9	-2.8
May 24	16.2	4.6	24.7	-1.6
May 25	16.4	4.6	26.4	-2.8
May 26	16.6	4.8	29.8	-2.2
May 27	16.8	4.9	27.8	-0.9
May 28	17.0	5.1	30.0	-2.3
May 29	17.2	5.3	26.1	-2.3
May 30	17.4	5.5	30.6	-1.4
May 31	17.5	5.7	27.2	-0.6

Weather Station Details

Years	Station	Coordinates
2012–2024	Saint John	location
1947–2012	Saint John A	location
1871–1946	Saint John	location