The highest day temperature in July 2026 was 97°F. The lowest night temperature was 70°F. The average values for day and night temperatures during July were 83.3°F и 75.2°F respectivly.

The average sea surface temperature in July 2026 for Dewey Beach was 79.0°F. The maximum and minimum values were 75.2°F and 84.0°F respectively.

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

Precipitation total in July for Dewey Beach is 1.5 in. It makes july the most rainy month of the year.

The average wind speed in July is 9.0 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 9.2 hours.