15.09
tue
tue
Day
63°F
SE 8 mph
Precip.
21%
21%
Night
52°F
W 9 mph
Precip.
25%
25%
16.09
wed
wed
Day
61°F
SE 4 mph
Precip.
21%
21%
Night
55°F
E 10 mph
Precip.
27%
27%
17.09
thu
thu
Day
68°F
E 12 mph
Precip.
3%
3%
Night
50°F
W 5 mph
Precip.
26%
26%
18.09
fri
fri
Day
57°F
NW 8 mph
Precip.
17%
17%
Night
52°F
NE 19 mph
Precip.
67%
67%
19.09
sat
sat
Day
43°F
E 36 mph
Precip.
33%
33%
Night
41°F
SE 19 mph
Precip.
18%
18%
20.09
sun
sun
Day
48°F
SE 14 mph
Precip.
1%
1%
Night
45°F
NE 7 mph
Precip.
25%
25%
21.09
mon
mon
Day
52°F
N 12 mph
Precip.
33%
33%
Night
48°F
SE 12 mph
Precip.
29%
29%
sea water
temperature
temperature
| St. John's |
monthly
weather
weather
| St. John's |
current
weather
weather
| St. John's |
14 days
forecast
forecast
| St. John's |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 58.9°F. The highest and lowest sea temperatures during the month were 60.8°F and 57.0°F.
Air temperature in St. John's, °F
Precipitation total in St. John's, in.
* Charts above show average data for the last 3 years.
Best time for vacation in St. John's
St. John's on a weather map
Places in Canada:
Name
°F
24 Hours Forecast
St. John's
Local time: 15:08
September 15, tuesday
1800
54°F
SW
8 mph
8 mph
2100
52°F
SW
9 mph
9 mph
September 16, wednesday
0000
52°F
W
9 mph
9 mph
0300
52°F
W
8 mph
8 mph
0600
54°F
W
6 mph
6 mph
0900
55°F
S
3 mph
3 mph
1200
61°F
SE
4 mph
4 mph
1500
66°F
NE
4 mph
4 mph
