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