Current sea water temperature:
+41.7°F
| Minimum sea water temperature in December: | 56.7°F |
| Maximum sea water temperature in December: | 41.2°F |
| Average sea water temperature in December: | 47.6°F |
| more information | |
14 days
forecast
forecast
| Dewey Beach |
monthly
weather
weather
| Dewey Beach |
Sea water temperature for the last 10 days:
| December 30 | 41.7°F | December 25 | 42.8°F |
| December 29 | 41.7°F | December 24 | 41.5°F |
| December 28 | 41.2°F | December 23 | 41.4°F |
| December 27 | 41.4°F | December 22 | 41.9°F |
| December 26 | 43.0°F | December 21 | 43.0°F |
Monthly sea water temperature, °F
When is the warmest sea in Dewey Beach?
Based on the data about daily sea water temperature for the last three years the warmest sea in Dewey Beach was noticed in July, August and September.
Monthly Sea Temperatures in Dewey Beach, °F
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 77.6°F. The highest and lowest sea temperatures during the month were 80.1°F and 74.5°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 76.4°F. The highest and lowest sea temperatures during the month were 82.2°F and 74.1°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 72.6°F. The highest and lowest sea temperatures during the month were 74.8°F and 70.9°F.
current
weather
weather
| Dewey Beach |
weather in
January
January
| Dewey Beach |
Best time for vacation in Dewey Beach
Dewey Beach on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Dewey Beach
Local time: 15:51
December 30, tuesday
1800
36°F
E
25 mph
25 mph
2100
30°F
E
21 mph
21 mph
December 31, wednesday
0000
30°F
E
18 mph
18 mph
0300
28°F
E
17 mph
17 mph
0600
30°F
NE
14 mph
14 mph
0900
32°F
NE
14 mph
14 mph
1200
39°F
E
16 mph
16 mph
1500
41°F
E
17 mph
17 mph
