Delaware has a classic, four-season continental climate, with each quarter having its own virtues and hazards. Summers tend to be hot and humid especially inland along the Brandywine Valley and in other rural regions. The coast is always about 10°F cooler than inland in the summertime due to the breezes off the Atlantic and 10°F warmer in winter. Although average summer temperatures are a pleasant 80°F, expect weather around 90°F from June through August even along the beaches, due to the pervasive humidity. There is also a strong chance of rain in the summer months, usually in the form of afternoon thunderstorms.
Winters in Delaware are cold, but reasonably mild due to the entire state’s proximity to the sea. Although the beaches are ideal for sunbathing, the Brandywine Valley is a year-round travel destination. Snow is uncommon in Delaware, as the temperatures are usually too warm, averaging in the upper 40s°F to low 50s °F from December through February. Spring tends to be rather rainy though the daytime highs start to become mild by mid-March. Fall is arguably the nicest time of year in every category.
Best Time to Visit Delaware
The bulk of visitors to Delaware come during the summer, between early June and late August. This is the peak season for the state’s beaches, when the sea and air temperatures are at their warmest. Rehoboth, Fenwick Island, and Dewey are packed to the gills with tourists, but it’s also a fun time of year for socializing and enjoying the outdoor activities. Just be sure and book things like hotels and rental cars well in advance during the summer months.
The downside of summer is that it can get very hot and humid. Even at the beach, moving around outdoors inevitably ends in a sweat. The absolute best time of year in terms of weather is the fall, between September and early November. The beaches are still pretty nice in September and by October and November, the Brandywine Valley is awash in color. Perfect daytime temperatures in the low 70s °F and blue skies make this a magical time throughout the state. Best of all, there are usually great deals on accommodation during this shoulder season. Late spring is another great time in Delaware if you are looking to avoid the summer crowds and catch deals on lodgings.