Delaware Weather & Climate Guide 2026

Delaware, the First State, packs remarkable diversity into the nation's second-smallest state — from the cosmopolitan Wilmington riverfront and historic New Castle's cobblestone streets to the Victorian beach resort of Rehoboth Beach and the wild marshes of Cape Henlopen. Rich in colonial and Revolutionary War history, home to major corporate headquarters and the DuPont dynasty's legacy estates, and bordered by Atlantic beaches, Delaware rewards visitors who look beyond its modest size.

Delaware has a humid subtropical climate with four distinct seasons. Summers are hot and humid with temperatures regularly reaching the high 80s°F (31-32°C) along the coast; occasional heat waves push into the 90s°F (32-38°C). Winters are cold but mild compared to New England — snowfall averages 15-20 inches annually in Wilmington, and beach towns receive even less. Spring and fall are Delaware's most comfortable seasons for outdoor activities. The Atlantic coast moderates beach temperatures slightly, keeping Rehoboth Beach a few degrees cooler than inland Delaware in summer.