Historical weather data, all-time temperature records, and monthly climate averages for Lorton, VA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Lorton runs mild but unpredictable — historically, highs land around 58° with lows dipping to 38°. The range is wide: this date has seen a balmy 78° as recently as 2025, but also a brutal 25° low back in 1962.
Lorton's weather has real teeth at its extremes — a scorching 100° in June 1969 on one end, and a bone-chilling -10° in January 1961 on the other. A single January day in 1966 dropped 18.7 inches of snow, still the all-time record.
Summer is the main event here, with late June through early July peaking around 87° and August being the wettest stretch of the year at over 1.6 inches per week. If you're avoiding the heat, aim for late fall or early spring — January and December both top out around 40°.