Wilmington Average Temperature by Month

This page shows the average temperature in each month of the year in Wilmington, Delaware. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Wilmington?
In Wilmington, Delaware, the warmest month is July, with an average daily high temperature of 86.6 °F and an average low of 68.1 °F.
What's the Coldest Month in Wilmington?
In Wilmington, Delaware, the coolest month is January, with an average daily high temperature of 41.2 °F and an average low of 25.4 °F.
Month Avg. High Avg. Low
January 41.2 °F 25.4 °F
February 43.9 °F 26.8 °F
March 52.3 °F 33.7 °F
April 64.0 °F 43.3 °F
May 73.3 °F 53.3 °F
June 82.0 °F 62.8 °F
July 86.6 °F 68.1 °F
August 84.7 °F 66.5 °F
September 78.3 °F 59.2 °F
October 66.8 °F 47.1 °F
November 55.7 °F 37.2 °F
December 45.8 °F 30.1 °F
Year 64.7 °F 46.2 °F
Weather Station Details
Years Station Coordinates
1948–2024 New Castle Airport location
1932–1947 Wilmington Porter Research location
1894–1931 Wilmington City Hall location
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