Current sea water temperature:
+77.4°F
| Minimum sea water temperature in September: | 79.5°F |
| Maximum sea water temperature in September: | 68.4°F |
| Average sea water temperature in September: | 73.3°F |
| more information | |
14 days
forecast
forecast
| Dewey Beach |
monthly
weather
weather
| Dewey Beach |
Sea water temperature for the last 10 days:
| September 9 | 77.4°F | September 4 | 75.2°F |
| September 8 | 77.4°F | September 3 | 74.7°F |
| September 7 | 77.2°F | September 2 | 77.5°F |
| September 6 | 78.4°F | September 1 | 76.8°F |
| September 5 | 78.8°F | August 31 | 75.9°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:
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
September
September
| 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: 18:46
September 09, wednesday
2100
75°F
N
24 mph
24 mph
September 10, thursday
0000
75°F
NE
24 mph
24 mph
0300
75°F
NE
22 mph
22 mph
0600
75°F
NE
22 mph
22 mph
0900
77°F
NE
19 mph
19 mph
1200
81°F
E
11 mph
11 mph
1500
81°F
SE
9 mph
9 mph
1800
79°F
SW
6 mph
6 mph
