Historical weather data, all-time temperature records, and monthly climate averages for Fairfax, VA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Fairfax typically lands in that sweet spot of early spring, with average highs around 65° and lows dipping to 41°. It's a date with real range in the record books — as warm as 82° back in 2003, and as brutal as 24° in 2013. Rain is a mild possibility at 31%, but snow is nearly off the table at just 1%.
Fairfax has seen the full extremes of mid-Atlantic weather over its 100-year record. Summers can turn punishing — the all-time high hit 100° in August 2015 — while winters have their teeth, bottoming out at -3° in February 1996. The wettest single day on record dumped 7.1 inches in September 1966, and a February 1983 snowstorm buried the area under 23 inches in one shot.
Fairfax peaks in the heat during the week of July 16–22, when average highs reach 86°, and bottoms out in late January with highs around 40°. July is also the wettest stretch of the year, averaging over an inch of precipitation per week. Spring and fall offer the most comfortable windows, with April and October both averaging highs in the mid-60s.