Is AccuWeather accurate?
One of the world's biggest weather brands, known for long-range forecasts and the 'RealFeel' temperature.
AccuWeather runs a closed, proprietary blend, so its exact accuracy cannot be independently verified. It is built on the same open models we grade — which we score directly. Watching those models is the honest way to judge it.
How AccuWeather makes its forecast. AccuWeather runs a proprietary blend built on top of the public models (GFS, ECMWF and others), plus its own adjustments. The exact recipe is closed, so its specific accuracy claims cannot be independently verified. That matters, because it means the accuracy you get from AccuWeather is really the accuracy of the models underneath it — the same models we test, in the open, against the recorded weather.
Our verdict. Its underlying inputs are the same open models we grade. Because the blend is closed we cannot score it directly — so the honest move is to watch those models themselves, which is the scoreboard above.
Which 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 300 cities. Lower error means a higher score. The apps you know (AccuWeather, Apple Weather, The Weather Channel) are built on these models.