Measurements:
°C
°F
CURRENT WEATHER
09:38
Dewey Beach
74°F
SW 14 mph
Feels like: 74°F
Precip: 4%
World Resorts USA Dewey Beach Weather

7 Day Weather Forecast

09.15
tue
DAY
74°F
W 14 mph
precip
8%
NIGHT
72°F
NW 11 mph
precip
9%
09.16
wed
DAY
72°F
W 6 mph
precip
5%
NIGHT
74°F
N 9 mph
precip
5%
09.17
thu
DAY
74°F
N 9 mph
precip
5%
NIGHT
76°F
NE 14 mph
precip
9%
09.18
fri
DAY
78°F
SW 8 mph
precip
17%
NIGHT
78°F
W 11 mph
precip
6%
09.19
sat
DAY
76°F
NW 17 mph
precip
20%
NIGHT
78°F
N 16 mph
precip
14%
09.20
sun
DAY
86°F
E 9 mph
precip
9%
NIGHT
78°F
SW 14 mph
precip
75%
09.21
mon
DAY
76°F
SW 13 mph
precip
74%
NIGHT
76°F
W 19 mph
precip
25%

Dewey Beach Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Dewey Beach was 24.9°F. The maximum and minimum values were 23.7°F and 26.0°F respectively.

Dewey Beach on the Weather Map

Best Time to Visit Dewey Beach
The most sunny months:
November 18 days
October 16 days
June 15 days
The most warm months:
July 84.1 °F
August 81.6 °F
June 77.6 °F
Warmest sea temperature:
July 78.3 °F
August 78.1 °F
September 75.6 °F
The most cold months:
January 39.5 °F
February 41.8 °F
December 45.1 °F
The most rainy months:
August 4 days
February 3 days
March 3 days
The most windy months:
March 13 mph
January 13 mph
February 12 mph
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