Current sea water temperature:
+40.8°F
| Minimum sea water temperature in January: | 47.1°F |
| Maximum sea water temperature in January: | 34.2°F |
| Average sea water temperature in January: | 42.2°F |
| more information | |
14 days
forecast
forecast
| Dewey Beach |
monthly
weather
weather
| Dewey Beach |
Sea water temperature for the last 10 days:
| January 13 | 40.8°F | January 8 | 40.3°F |
| January 12 | 42.1°F | January 7 | 39.0°F |
| January 11 | 39.6°F | January 6 | 39.6°F |
| January 10 | 39.6°F | January 5 | 39.7°F |
| January 9 | 38.8°F | January 4 | 39.6°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: 06:18
January 13, tuesday
0900
37°F
NE
6 mph
6 mph
1200
46°F
N
9 mph
9 mph
1500
46°F
NE
13 mph
13 mph
1800
46°F
N
16 mph
16 mph
2100
45°F
NE
18 mph
18 mph
January 14, wednesday
0000
45°F
NE
21 mph
21 mph
0300
43°F
NE
17 mph
17 mph
0600
41°F
NE
17 mph
17 mph
