Historical weather data, all-time temperature records, and monthly climate averages for Chantilly, VA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Chantilly runs mild, with average highs of 61° and lows of 39° across 65 years of records. The date has a wild range though — temperatures have swung from a bitter 22° in 1965 all the way to 88° as recently as 2023. Rain is possible but unlikely, with just a 29% chance of precipitation and essentially no snow risk.
Chantilly's weather has real teeth at the extremes — the thermometer has hit 105° in July 2011 and plunged to -18° in January 1984, a swing of 123 degrees. A single day in June 1972 dropped 10.67 inches of rain, and a February 1983 snowstorm buried the area under 22.5 inches.
Summer is the main event here, with highs averaging 88-89° in mid-July and peak humidity to match. Winters are cold but not brutal, with January highs hovering around 40-42°. Plan for rain in late May through early June — that stretch is the wettest of the year, averaging over an inch of precipitation per week.