Measurements:
°C
°F
CURRENT WEATHER
17:53
Saint John
68°F
SE 10 mph
Feels like: 68°F
Precip: 10%
World Resorts Canada Saint John Weather

7 Day Weather Forecast

09.08
tue
DAY
72°F
SE 12 mph
precip
11%
NIGHT
50°F
S 6 mph
precip
22%
09.09
wed
DAY
58°F
N 7 mph
precip
13%
NIGHT
56°F
N 13 mph
precip
22%
09.10
thu
DAY
70°F
NE 12 mph
precip
21%
NIGHT
60°F
SE 12 mph
precip
23%
09.11
fri
DAY
60°F
SE 14 mph
precip
2%
NIGHT
48°F
SE 5 mph
precip
9%
09.12
sat
DAY
62°F
E 4 mph
precip
4%
NIGHT
50°F
N 4 mph
precip
29%
09.13
sun
DAY
62°F
N 11 mph
precip
13%
NIGHT
56°F
N 10 mph
precip
17%
09.14
mon
DAY
58°F
NE 5 mph
precip
67%
NIGHT
52°F
S 8 mph
precip
13%

Saint John Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Saint John was 14.7°F. The maximum and minimum values were 13.7°F and 16.2°F respectively.

Saint John on the Weather Map

Best Time to Visit Saint John
The most sunny months:
September 10 days
October 10 days
August 9 days
The most warm months:
July 74.9 °F
August 73.8 °F
June 69.6 °F
Warmest sea temperature:
August 60.4 °F
September 59.3 °F
July 57.3 °F
The most cold months:
January 22.9 °F
February 23.7 °F
December 30.5 °F
The most rainy months:
August 3 days
October 3 days
July 3 days
The most windy months:
March 9 mph
December 9 mph
February 8 mph
more details