26.08
wed
wed
Day
63°F
NE 4 mph
Precip.
35%
35%
Night
61°F
NE 4 mph
Precip.
25%
25%
27.08
thu
thu
Day
68°F
NE 8 mph
Precip.
17%
17%
Night
57°F
N 5 mph
Precip.
43%
43%
28.08
fri
fri
Day
68°F
NE 12 mph
Precip.
22%
22%
Night
63°F
NE 7 mph
Precip.
91%
91%
29.08
sat
sat
Day
66°F
SE 8 mph
Precip.
13%
13%
Night
54°F
S 4 mph
Precip.
6%
6%
30.08
sun
sun
Day
66°F
NE 9 mph
Precip.
11%
11%
Night
57°F
E 7 mph
Precip.
46%
46%
31.08
mon
mon
Day
63°F
SE 11 mph
Precip.
2%
2%
Night
54°F
SE 4 mph
Precip.
6%
6%
01.09
tue
tue
Day
64°F
NW 0 mph
Precip.
12%
12%
Night
54°F
SW 4 mph
Precip.
20%
20%
sea water
temperature
temperature
| Saint John |
monthly
weather
weather
| Saint John |
current
weather
weather
| Saint John |
14 days
forecast
forecast
| Saint John |
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 58.2°F. The highest and lowest sea temperatures during the month were 61.9°F and 52.5°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 58.5°F. The highest and lowest sea temperatures during the month were 61.2°F and 56.7°F.
Air temperature in Saint John, °F
Precipitation total in Saint John, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Saint John
Saint John on a weather map
Places in Canada:
Name
°F
24 Hours Forecast
Saint John
Local time: 15:17
August 26, wednesday
1800
70°F
NE
7 mph
7 mph
2100
61°F
NE
5 mph
5 mph
August 27, thursday
0000
61°F
NE
4 mph
4 mph
0300
59°F
N
4 mph
4 mph
0600
59°F
N
4 mph
4 mph
0900
63°F
NE
5 mph
5 mph
1200
68°F
NE
8 mph
8 mph
1500
70°F
NE
9 mph
9 mph
