According to Köppen and Geiger, this climate is classified as Cfa. As much as 15% of the rainfall during the warm season in the Carolinas can be attributed to tropical cyclones. Annual Weather Averages Near Wilmington. Wilmington's coldest month is January when the average temperature overnight is 35.8°F. Wilmington climate summary The Wilmington lies on 312m above sea level The climate here is mild, and generally warm and temperate. Average Weather in May in Wilmington North Carolina, United States. Average temperatures and precipitation amounts for more than 147 cities in North Carolina. There is an average of forty-five inches of rain a year (fifty inches in mountainous regions). If Wilmington gets its average rainfall for the next two months, the year will finish up at about 96 inches of rain. Average Weather in February in Wilmington North Carolina, United States. Dew Point: 44 °F. Averages are for New Castle County Airport, which is 6 miles from Wilmington. The starting point for official government weather forecasts, warnings, meteorological products for forecasting the weather, and information about meteorology. Radar-Estimated Rainfall Maps; North Carolina Average Monthly Precipitation; Other. But Oliva said 2018 has been anything but average… Government Internet Service Home page. Low Temp: 25 °F. Wilmington: 56/36 60/38 66/44 74/51 81/60 86/68 90/72 88/71 84/66 76/54 68/45 60/38 Precipitation. The average temperature in Wilmington is 11.1 °C | 51.9 °F. Mean Temp: 55 °F. Pressure: 30.06 "Hg. High Temp: 86 °F. Wind: 7 mph. July storms account for much of this precipitation. The is a great deal of rainfall in Wilmington, even in the driest month. Average Yearly Rainfall Maps. Based on weather reports collected during 1985–2015. Showing: All Year Climate & Weather Averages in Wilmington. A climate chart for your city, indicating the monthly high temperatures and rainfall. In July, the warmest month, the average day time temperature rises to 89.9°F. Precipitation: 1.73" Humidity: 68%. Climate in North Carolina.