Mostly Sunny

Today

Mostly Sunny

84°

/ 59°

Herndon, Virginia

5 Day Forecast

Weather Forecast Accuracy Last Month (August)

The Weather Channel

77.15%

Foreca/Vaisala

76.88%

Microsoft

75.27%

AerisWeather

74.46%

Weatherbit

74.18%

AccuWeather

73.61%

NWS Digital Forecast

69.35%

Wetter

67.47%

Pirate Weather

65.56%

World Weather Online

63.61%

OpenWeather

59.95%

Persistence

52.99%

Note: Weather Underground uses the same forecast as The Weather Channel and so is not shown

Weather Forecast Accuracy Last Year (2022)

The Weather Channel

81.51%

Microsoft

80.44%

AccuWeather

78.70%

AerisWeather

76.64%

Foreca/Vaisala

75.89%

NWS Digital Forecast

73.42%

Weatherbit

70.36%

Wetter

69.61%

World Weather Online

66.62%

OpenWeather

66.53%

Persistence

41.67%

ForecastAdvisor Fact

On average, AccuWeather's high temperature forecasts for Herndon were off by 2.16 degrees last month.

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