Wilmington averages 45.6 days a year above 90°F, with September the wettest month at 8.69 in of normal rain. The hottest day on record was 103°F on Aug 1, 1999; the coldest, 0°F on Dec 25, 1989. The single biggest 24-hour rain event recorded was 13.38 in on Sep 15, 1999.
Climate and Average Weather Year Round in Wilmington
Year-round temperature
In Wilmington, the warmest months are June through September, with average daily highs between 84°F and 90°F. The coldest stretch runs December through February, with highs between 57°F and 60°F and overnight lows reaching 36°F.
Rainfall through the year
Rainfall in Wilmington averages 5.0 in per month over the long run. September is the wettest at 8.7 in, while April is the driest at 3.1 in.
Days at 90 °F or hotter
Wilmington averages 45.6 days per year at 90 °F or hotter. The hottest year on record saw 77 such days (2019); the coolest just 1 (2026).
Precipitation this year
As of May 29, Wilmington has received 10.8 in of precipitation this year — 42% below the long-term normal for this point in the year (18.6 in).