Is Delaware too cold to swim in summer? In July sea water temperature throughout Delaware warms above 68°F and it is enough for a comfortable bath. Based on average water temperature observations over the past ten years, the warmest ocean in Delaware in July was 79.3°F (in Wilmington), and the coldest sea 74.3°F (in Towers Beach). To find out the sea temperature today and in the coming days, go to Current sea temperature in Delaware
Delaware cities and resorts with the values of the average water temperature in July in recent years.
For more detailed information about water temperature, surf forecast, weather and time of sunrise and sunset in any specific area of your interest, just click on a city name. For ease of search, all places are also grouped by the first letter of the name.
To find out what the water temperature was in Delaware any day over a period of the last ten years, select the month