Barometric Pressure in Fairfax, United States 
1019.8 hPa
17.9 ℃
95%
1.28 m/s
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The average pressure in Fairfax, Virginia, United States today is , which is considered normal. Pressure is trending falling.
Weather prediction: Rain at times, worse later
The daily total fluctuation in pressure in Fairfax is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Fairfax hour by hour across the next 6 hourly readings.
Fairfax's weather pattern moves from high to low pressure and back to high again, causing changes in the air pressure.
The area's 300-foot elevation and mix of hills and valleys affect atmospheric pressure, making it change often. The nearby Blue Ridge Mountains also influence pressure patterns.
In winter, pressure is usually high, bringing cold air. In summer, pressure is lower, making it hot and humid. Spring and autumn have moderate pressure, with mild weather.
Fairfax has a humid subtropical climate, with noticeable changes in barometric pressure throughout the year, which affects the weather and how people feel.