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Guide to Williamsburg weather in April. The average maximum daytime temperature in Williamsburg in April is a comfortable 21Â°C (70Â°F). The average night-time temperature is usually a cold 7Â°C (45Â°F). There are usually 9 hours of bright sunshine each day, which represents 65% of the 13 hours of daylight.
Williamsburg Temperatures: Averages by Month. The numbers here tell you how hot and cold the weather usually is in Williamsburg, Virginia during each month of the year. The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius. Maximums and minimums are only part of the temperature picture.