Current sea water temperature:
+77.7°F
| Minimum sea water temperature in August: | 82.2°F |
| Maximum sea water temperature in August: | 69.4°F |
| Average sea water temperature in August: | 75.2°F |
| more information | |
14 days
forecast
forecast
| Dewey Beach |
monthly
weather
weather
| Dewey Beach |
Sea water temperature for the last 10 days:
| August 16 | 77.7°F | August 11 | 79.5°F |
| August 15 | 77.4°F | August 10 | 80.8°F |
| August 14 | 78.1°F | August 9 | 81.0°F |
| August 13 | 80.4°F | August 8 | 79.0°F |
| August 12 | 80.1°F | August 7 | 78.1°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 76.1°F. The highest and lowest sea temperatures during the month were 80.6°F and 72.7°F.
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 77.9°F. The highest and lowest sea temperatures during the month were 81.0°F and 74.5°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
August
August
| 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: 05:57
August 16, sunday
0600
75°F
NW
8 mph
8 mph
0900
75°F
NW
9 mph
9 mph
1200
72°F
NW
13 mph
13 mph
1500
70°F
NW
17 mph
17 mph
1800
70°F
NW
21 mph
21 mph
2100
72°F
N
22 mph
22 mph
August 17, monday
0000
73°F
N
15 mph
15 mph
0300
73°F
NE
3 mph
3 mph
