Weather By Day

September Wilmington Weather 
September Wilmington Weather
Record High: 100°F
Normal High: 77°F
Normal Low: 58°F
Record Low: 36°F
Avg Monthly Rain: 4.01"
Rec 1 Day Rain: 8.29"

Wilmington Weather In September

The highest recorded temperature in September for Wilmington Delaware for the past 63 years was 100 degrees Fahrenheit, most recently encountered on September 11, 1983, and the regular high is 77. In the last 63 years the highest reported temperature in Wilmington for September was 36 most recently measured on September 24, 1974, while the normal low measured temperature is 58.

United States NWS historical Wilmington September Weather data records that on September 28, 1984, the high temperature did not exceed 51 degrees Fahrenheit, the lowest high measured in Wilmington in the past 63 years. The Weather Service additionally indicates that on September 3, 1993, the low for the day did not drop below 79 degrees, the highest low recorded in Wilmington in the last 63 years.

Historical weather data accumulated by the National Weather Service shows that the average daily high temperature in Wilmington on September First is 82 degrees Fahrenheit and the average high on the last day of September is 71 degrees. The low recorded temperature in Wilmington on September First averages 64 degrees Fahrenheit and the low temperature on the final day of September averages 52 degrees.

Wilmington usually receives an average of 4.01 inches of rain during September. The most precipitation recorded on a single day in September, according to September Wilmington Weather data, was 8.29 inches on September 16, 1999.