Current sea water temperature:
+66.4°F
| Minimum sea water temperature in September: | 79.5°F |
| Maximum sea water temperature in September: | 66.2°F |
| Average sea water temperature in September: | 73.2°F |
| more information | |
14 days
forecast
forecast
| Dewey Beach |
monthly
weather
weather
| Dewey Beach |
Sea water temperature for the last 10 days:
| September 30 | 66.4°F | September 25 | 71.1°F |
| September 29 | 66.2°F | September 24 | 72.0°F |
| September 28 | 66.9°F | September 23 | 73.6°F |
| September 27 | 68.0°F | September 22 | 75.2°F |
| September 26 | 69.3°F | September 21 | 74.7°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 77.3°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:
2026
2025
2024
The average sea water temperature in September of 2026 was 74.2°F. The highest and lowest sea temperatures during the month were 78.8°F and 66.2°F.
current
weather
weather
| Dewey Beach |
weather in
October
October
| 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: 09:25
September 30, wednesday
1200
68°F
S
3 mph
3 mph
1500
68°F
NW
8 mph
8 mph
1800
68°F
N
12 mph
12 mph
2100
66°F
N
12 mph
12 mph
October 01, thursday
0000
66°F
N
10 mph
10 mph
0300
66°F
NE
9 mph
9 mph
0600
66°F
N
9 mph
9 mph
0900
66°F
N
11 mph
11 mph
