Current sea water temperature:
+37.8°F
| Minimum sea water temperature in December: | 50.9°F |
| Maximum sea water temperature in December: | 35.8°F |
| Average sea water temperature in December: | 43.5°F |
| more information | |
14 days
forecast
forecast
| New Castle |
monthly
weather
weather
| New Castle |
Sea water temperature for the last 10 days:
| December 23 | 37.8°F | December 18 | 37.8°F |
| December 22 | 37.4°F | December 17 | 39.2°F |
| December 21 | 38.5°F | December 16 | 39.6°F |
| December 20 | 37.8°F | December 15 | 40.3°F |
| December 19 | 37.8°F | December 14 | 40.6°F |
Monthly sea water temperature, °F
When is the warmest sea in New Castle?
Based on the data about daily sea water temperature for the last three years the warmest sea in New Castle was noticed in July, August and September.
Monthly Sea Temperatures in New Castle, °F
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 81.2°F. The highest and lowest sea temperatures during the month were 83.7°F and 78.4°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 79.6°F. The highest and lowest sea temperatures during the month were 84.0°F and 75.9°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 73.5°F. The highest and lowest sea temperatures during the month were 75.7°F and 71.6°F.
current
weather
weather
| New Castle |
weather in
December
December
| New Castle |
Best time for vacation in New Castle
New Castle on a weather map
Places in USA:
Name
°F
24 Hours Forecast
New Castle
Local time: 21:45
December 24, wednesday
0000
37°F
E
6 mph
6 mph
0300
36°F
E
7 mph
7 mph
0600
36°F
SE
14 mph
14 mph
0900
37°F
SE
14 mph
14 mph
1200
45°F
SE
14 mph
14 mph
1500
45°F
SE
12 mph
12 mph
1800
39°F
SE
6 mph
6 mph
2100
36°F
S
4 mph
4 mph
