Fairfax weather
Loading live data…Latest for Fairfax: NWS (National Blend (NBM)): 71° Mainly clear · American (NOAA GFS): 74° Overcast · European (ECMWF): 72° Mainly clear.
The weather map: all three models at once
NWS, American, European side by side around Fairfax and nearby towns.Live rain radar →Next 14 hours
consensus of the three models14-day forecast
where the models agree, and where they splitFairfax, VA is at its warmest in Jul (average highs near 89°F) and coldest in Jan (lows around 32°F), with roughly 42 in of precipitation across the year. Below, compare what NWS, American, European forecast for Fairfax right now, and see exactly where they disagree.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.
Fairfax climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in the US?
CheckWeather Score — graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.