The highest day temperature in July 2025 was 95°F. The lowest night temperature was 70°F. The average values for day and night temperatures during July were 86.4°F и 77.6°F respectivly.

The average sea surface temperature in July 2025 for Dewey Beach was 80.7°F. The maximum and minimum values were 77.2°F and 83.4°F respectively.

Most of the days in July are cloudy but you can also expect sunny or gloomy days.

Precipitation total in July for Dewey Beach is 1.6 in. It makes july the most rainy month of the year.

The average wind speed in July is 8.9 mph. It makes July the most windless month 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 July is 8.6 hours.