Is Delaware warm enough to swim in winter? In January sea water temperature throughout Delaware is not yet warm enough for swimming and does not exceed 68°F. Based on average water temperature observations over the past ten years, the warmest ocean in Delaware in January was 43.3°F (in Fenwick Island), and the coldest sea 37°F (in Edgemoor). 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 January 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