Dewey Beach Weather: September
 |
Average Day Temperature: | 76.6°F |
|
Average Night Temperature: | 70.4°F |
|
Sea Water Temperature: | 75.6°F |
|
Number of Sunny Days: | 13 days |
| Sunshine Hours: | 11.8 - 13.0 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 1.0 in | |
| detailed information | ||
forecast
| Dewey Beach |
Temperature
| Dewey Beach |
Air Temperature in September, °F
The highest day temperature in September 2025 was 89°F. The lowest night temperature was 64°F. The average values for day and night temperatures during September were 76.3°F и 70.1°F respectivly.
Dewey Beach Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Dewey Beach was 75.2°F. The maximum and minimum values were 73.2°F and 77.6°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Dewey Beach is 1.0 in. It makes september one of the least rainy months of the year.
The average wind speed in September is 11.2 mph. It makes September one of the most windless months of the year for Dewey Beach.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Dewey Beach in September is 7.4 hours.
Dewey Beach on the Weather Map
| Chicago |  |
0 |
| Hawaii |  |
+78 |
| Honolulu | |
+78 |
| Houston | |
+46 |
| Las Vegas |  |
+40 |
| Los Angeles | |
+52 |
| Maui | |
+72 |
| Miami | |
+72 |
| Miami Beach | |
+80 |
| New York | |
+18 |
| San Diego | |
+54 |
| San Francisco | |
+46 |
| Sarasota | |
+62 |
| Tampa | |
+62 |
| Washington | |
+28 |
| 0300 |  |
32°F | SW 12 mph |
| 0600 |  |
34°F | SW 9 mph |
| 0900 | |
30°F | SW 7 mph |
| 1200 | |
32°F | SW 9 mph |
| 1500 | |
36°F | S 6 mph |
| 1800 | |
38°F | S 8 mph |
| 2100 | |
36°F | S 9 mph |
| 0000 | |
36°F | S 11 mph |