Historical weather data, all-time temperature records, and monthly climate averages for Mount Vernon, VA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th at Mount Vernon runs mild but variable — expect a high around 61° and a low near 37°, with about a 1-in-3 chance of rain. The date has swung wildly across years, from a bitter 25° back in 1965 to a shirt-sleeve 80° just this year in 2025.
Mount Vernon's weather has real teeth at the extremes — the thermometer has hit 100° in June and plunged to -10° in January, a 110-degree spread over the station's history. A single January day in 1966 dropped 18.7 inches of snow, and a September storm that same year dumped over 4.5 inches of rain.
Summer is the main event here, with highs climbing into the mid-to-upper 80s from late June through August — peak warmth lands in the last week of June at an average 87°. Winters are chilly but not brutal, bottoming out around 40° in early January. If you're watching for rain, late August is the wettest stretch of the year.