Current sea water temperature:
+78.1°F
| Minimum sea water temperature in July: | 80.8°F |
| Maximum sea water temperature in July: | 68.9°F |
| Average sea water temperature in July: | 75.5°F |
| more information | |
14 days
forecast
forecast
| Dewey Beach |
monthly
weather
weather
| Dewey Beach |
Sea water temperature for the last 10 days:
| July 21 | 78.1°F | July 16 | 77.0°F |
| July 20 | 79.2°F | July 15 | 75.9°F |
| July 19 | 77.9°F | July 14 | 76.8°F |
| July 18 | 77.5°F | July 13 | 78.4°F |
| July 17 | 78.8°F | July 12 | 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 76.7°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:
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
July
July
| 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: 09:44
July 21, tuesday
1200
84°F
N
14 mph
14 mph
1500
81°F
N
19 mph
19 mph
1800
81°F
N
17 mph
17 mph
2100
75°F
NE
20 mph
20 mph
July 22, wednesday
0000
75°F
NE
15 mph
15 mph
0300
75°F
NE
21 mph
21 mph
0600
75°F
NE
16 mph
16 mph
0900
75°F
NE
16 mph
16 mph
