Current sea water temperature:
+41.5°F
| Minimum sea water temperature in March: | 50.5°F |
| Maximum sea water temperature in March: | 35.6°F |
| Average sea water temperature in March: | 44.5°F |
| more information | |
14 days
forecast
forecast
| Dewey Beach |
monthly
weather
weather
| Dewey Beach |
Sea water temperature for the last 10 days:
| March 18 | 41.5°F | March 13 | 41.5°F |
| March 17 | 42.1°F | March 12 | 42.3°F |
| March 16 | 41.9°F | March 11 | 40.8°F |
| March 15 | 41.2°F | March 10 | 40.8°F |
| March 14 | 39.6°F | March 9 | 37.6°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
March
March
| 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: 03:22
March 19, thursday
0600
37°F
NW
4 mph
4 mph
0900
39°F
NW
7 mph
7 mph
1200
45°F
NW
7 mph
7 mph
1500
45°F
NW
12 mph
12 mph
1800
45°F
N
12 mph
12 mph
2100
41°F
N
10 mph
10 mph
March 20, friday
0000
39°F
N
9 mph
9 mph
0300
39°F
NE
7 mph
7 mph
