Measurements:
°C
°F
CURRENT WEATHER
18:59
St. John's
54°F
S 9 mph
Feels like: 52°F
Precip: 26%
World Resorts Canada St. John's Weather

7 Day Weather Forecast

09.08
tue
DAY
60°F
SE 9 mph
precip
33%
NIGHT
52°F
S 7 mph
precip
24%
09.09
wed
DAY
54°F
SW 11 mph
precip
21%
NIGHT
46°F
S 1 mph
precip
15%
09.10
thu
DAY
62°F
N 11 mph
precip
14%
NIGHT
56°F
N 17 mph
precip
56%
09.11
fri
DAY
74°F
NE 16 mph
precip
3%
NIGHT
52°F
E 14 mph
precip
8%
09.12
sat
DAY
54°F
SE 13 mph
precip
22%
NIGHT
46°F
SE 11 mph
precip
6%
09.13
sun
DAY
58°F
E 4 mph
precip
1%
NIGHT
48°F
NE 9 mph
precip
27%
09.14
mon
DAY
62°F
NE 14 mph
precip
18%
NIGHT
60°F
NE 14 mph
precip
27%

St. John's Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for St. John's was 13.4°F. The maximum and minimum values were 12.2°F and 14.7°F respectively.

St. John's on the Weather Map

Best Time to Visit St. John's
The most sunny months:
August 8 days
September 7 days
July 7 days
The most warm months:
August 67.9 °F
July 66.1 °F
September 61.4 °F
Warmest sea temperature:
August 59.9 °F
September 57.8 °F
July 53.0 °F
The most cold months:
February 25.7 °F
January 28.0 °F
March 29.7 °F
The most rainy months:
November 6 days
August 3 days
May 3 days
The most windy months:
February 16 mph
March 15 mph
January 15 mph
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