Current sea water temperature:
+38.8°F
| Minimum sea water temperature in December: | 45.5°F |
| Maximum sea water temperature in December: | 36.5°F |
| Average sea water temperature in December: | 40.3°F |
| more information | |
14 days
forecast
forecast
| Sydney |
monthly
weather
weather
| Sydney |
Sea water temperature for the last 10 days:
| December 14 | 38.8°F | December 9 | 40.6°F |
| December 13 | 38.8°F | December 8 | 41.0°F |
| December 12 | 38.7°F | December 7 | 41.4°F |
| December 11 | 39.4°F | December 6 | 42.1°F |
| December 10 | 39.9°F | December 5 | 42.8°F |
Monthly sea water temperature, °F
When is the warmest sea in Sydney?
Based on the data about daily sea water temperature for the last three years the warmest sea in Sydney was noticed in August, September and July.
Monthly Sea Temperatures in Sydney, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 67.5°F. The highest and lowest sea temperatures during the month were 69.8°F and 65.8°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 64.8°F. The highest and lowest sea temperatures during the month were 68.2°F and 60.6°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 63.7°F. The highest and lowest sea temperatures during the month were 68.5°F and 56.8°F.
current
weather
weather
| Sydney |
weather in
December
December
| Sydney |
Best time for vacation in Sydney
Sydney on a weather map
Places in Canada:
Name
°F
24 Hours Forecast
Sydney
Local time: 02:58
December 15, monday
0300
34°F
S
21 mph
21 mph
0600
32°F
S
23 mph
23 mph
0900
30°F
SE
22 mph
22 mph
1200
30°F
SE
21 mph
21 mph
1500
28°F
SE
22 mph
22 mph
1800
27°F
E
23 mph
23 mph
2100
25°F
E
22 mph
22 mph
December 16, tuesday
0000
25°F
E
19 mph
19 mph
