Arlington, Virginia experiences four distinct seasons marked by humid summers, crisp autumns, relatively mild winters, and changeable springs. Temperatures typically range from a low of 27°F in January to a high of 89°F in July. Whether you're planning a trip, moving to the area, or tracking local climate patterns, understanding how the thermometer fluctuates across the year helps you prepare for the mid-Atlantic weather.
The region's climate is heavily influenced by its position in the Potomac River valley and its mix of dense urban development and suburban green spaces. Urban heat island dynamics can keep concrete-heavy commercial corridors several degrees warmer at night than nearby parks. To help you navigate these shifts, this guide breaks down monthly averages, seasonal transitions, and practical wardrobe tips.
Arlington Weather at a Glance
Before diving into individual seasons, it helps to review the baseline climate statistics for Arlington County. Annual precipitation averages around 46 inches, distributed fairly evenly throughout the year. Summer brings convective thunderstorms, while winter occasionally introduces nor'easters carrying rain or snow.
- Hottest Month: July (average high of 89°F, average low of 72°F)
- Coldest Month: January (average high of 44°F, average low of 27°F)
- Annual Precipitation: ~46 inches
- Annual Snowfall: ~11 inches
Spring: March through May
Spring in Arlington arrives with a dramatic transition from winter chill to blooming warmth. March acts as a bridge month, where daytime highs average 56°F, though sudden cold snaps still happen. By May, daily highs reach a comfortable 76°F with lows around 57°F.
This season is notoriously volatile. You might experience a 75°F sunny afternoon one day and a freezing rain warning the next. Rainfall picks up during these months, peaking around May with roughly 4 inches of precipitation. Cherry blossoms and dogwoods peak in late March or early April, drawing heavy foot traffic to nearby monuments and parks. Pack layers, a windbreaker, and an umbrella if you're visiting during these months.
Summer: June through August
Summers in Arlington are defined by heat and thick humidity. July is the warmest month of the year, boasting average highs of 89°F and overnight lows that rarely drop below 70°F. High dew points—often exceeding 65°F—create muggy conditions where the heat index makes outdoor activities feel well above 95°F.
Afternoon thunderstorms are common during July and August, driven by moisture pushing inland from the Atlantic and the Gulf of Mexico. These storms are usually brief but intense, dumping heavy rain and occasionally causing localized street flooding. If you're out exploring Rosslyn or walking along the Mount Vernon Trail, stay hydrated and schedule strenuous outdoor exercise for early mornings.
Autumn: September through November
Autumn is widely regarded as the most pleasant time of year in Arlington. September retains a warm summer feel with average highs near 80°F, but the heavy humidity begins to break. By November, daytime highs cool down to 58°F, and overnight lows dip to 41°F.
Rainfall drops slightly during early autumn, and skies are historically clearest in September. Fall foliage peaks across local green spaces like Glencarlyn Park around late October and early November. The comfortable air makes autumn ideal for walking tours, outdoor dining, and visiting historical sites without the oppressive summer heat.
Winter: December through February
Winters in Arlington are generally mild compared to northern regions, but they still bring proper cold weather. January is the coldest month, featuring average daytime highs of 44°F and lows dropping to 27°F. Sub-freezing temperatures happen regularly at night, though prolonged sub-zero cold snaps are rare.
Snowfall varies dramatically from year to year. Arlington averages about 11 inches of snow annually, often arriving in a few major storm events rather than steady powder. Nor'easters can occasionally sweep up the coast, bringing heavy wet snow, sleet, or freezing rain that disrupts local transit. Heavy coats, gloves, and sturdy footwear are essential for winter commuting.
Microclimates and the Urban Heat Effect
Temperature isn't uniform across the entire county. Highly developed urban corridors—such as Ballston, Clarendon, and Crystal City—suffer from the urban heat island effect. Extensive asphalt, concrete, and high-rise buildings absorb solar radiation during the day and re-radiate it slowly at night. Consequently, nighttime temperatures in these commercial centers can stay 3 to 5 degrees warmer than quieter residential neighborhoods or heavily wooded parks near the Potomac River.
Frequently Asked Questions
What is the hottest temperature ever recorded in Arlington?
The all-time record high for the local area reached 106°F in July 1936 during a historic mid-century heat wave. Modern summer spikes occasionally approach the upper 90s, but readings above 100°F are uncommon.
Does Arlington get a lot of snow in the winter?
Snowfall is moderate, averaging about 11 inches per season. While some years pass with minimal accumulation, occasional coastal storms can drop significant snow over a 24-hour period.
When is the best time of year to visit Arlington?
Late spring (April to May) and early autumn (September to October) offer the most comfortable weather, avoiding both the humid extremes of summer and the freezing temperatures of mid-winter.
How humid does it get during summer?
July and August are the most humid months, with dew points frequently climbing above 65°F. This creates a heavy, muggy atmosphere that makes outdoor exertion feel significantly hotter than the actual air temperature.
