Saint John September Weather

Averages and records for weather in Saint John, New Brunswick in the month of September.
Typical Saint John September Weather
1991–2020
Average daily high 19.0 °C
Average daily low 7.5 °C
Average monthly precipitation 11.0 cm
Average monthly snow none
Daily chance of precipitation 35.5%
Daily chance of snow 0%
Saint John September Weather Records
1871–2024
Highest temperature 33.9 °C September 8, 1945
Lowest temperature -6.7 °C September 29, 1947
Highest daily low 19.0 °C September 10, 1999
Lowest daily high 7.2 °C September 28, 1914
Hottest average high temperature 21.8 °C 2015
Coldest average high temperature 15.5 °C 1879
Most daily precipitation 11.8 cm September 16, 1940
Most monthly precipitation 23.8 cm 1949
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)
High Low High Low
September 1 21.3 9.5 33.1 0.8
September 2 21.2 9.4 31.3 -0.6
September 3 21.0 9.3 31.0 -0.6
September 4 20.8 9.1 29.1 -1.1
September 5 20.7 8.9 29.4 1.1
September 6 20.5 8.7 28.9 -0.3
September 7 20.4 8.6 26.1 1.1
September 8 20.3 8.5 33.9 0.6
September 9 20.1 8.4 26.7 1.0
September 10 20.0 8.3 30.9 -0.9
September 11 19.8 8.1 27.8 -4.4
September 12 19.6 7.9 26.6 -2.2
September 13 19.4 7.8 25.5 -1.1
September 14 19.3 7.7 28.3 -1.1
September 15 19.1 7.6 24.4 -1.1
September 16 18.9 7.4 26.7 -1.8
September 17 18.7 7.3 27.4 -4.4
September 18 18.5 7.2 26.2 -0.7
September 19 18.3 7.0 27.0 -2.1
September 20 18.1 6.9 27.8 -2.8
September 21 17.9 6.7 28.9 -3.9
September 22 17.7 6.5 23.9 -1.7
September 23 17.5 6.3 25.7 -2.8
September 24 17.3 6.0 26.1 -5.0
September 25 17.1 5.9 25.9 -3.2
September 26 17.0 5.8 26.1 -2.2
September 27 16.8 5.6 25.6 -2.4
September 28 16.6 5.5 24.0 -2.8
September 29 16.4 5.3 22.8 -6.7
September 30 16.3 5.1 23.3 -3.9
Weather Station Details
Years Station Coordinates
2012–2024 Saint John location
1947–2012 Saint John A location
1871–1946 Saint John location