Current sea water temperature:
+36.0°F
| Minimum sea water temperature in December: | 43.0°F |
| Maximum sea water temperature in December: | 34.7°F |
| Average sea water temperature in December: | 38.6°F |
| more information | |
14 days
forecast
forecast
| St. John's |
monthly
weather
weather
| St. John's |
Sea water temperature for the last 10 days:
| December 20 | 36.0°F | December 15 | 37.6°F |
| December 19 | 36.3°F | December 14 | 37.8°F |
| December 18 | 36.1°F | December 13 | 37.6°F |
| December 17 | 36.5°F | December 12 | 37.8°F |
| December 16 | 37.2°F | December 11 | 37.9°F |
Monthly sea water temperature, °F
When is the warmest sea in St. John's?
Based on the data about daily sea water temperature for the last three years the warmest sea in St. John's was noticed in August, September and July.
Monthly Sea Temperatures in St. John's, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 57.9°F. The highest and lowest sea temperatures during the month were 60.6°F and 55.6°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 56.1°F. The highest and lowest sea temperatures during the month were 58.5°F and 54.0°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 53.0°F. The highest and lowest sea temperatures during the month were 57.7°F and 47.3°F.
current
weather
weather
| St. John's |
weather in
December
December
| St. John's |
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: 20:47
December 20, saturday
2100
32°F
E
27 mph
27 mph
December 21, sunday
0000
28°F
E
30 mph
30 mph
0300
28°F
E
24 mph
24 mph
0600
28°F
E
17 mph
17 mph
0900
28°F
E
14 mph
14 mph
1200
32°F
E
14 mph
14 mph
1500
32°F
NE
12 mph
12 mph
1800
32°F
N
11 mph
11 mph
