Herndon Weather Forecast
- 52
- 70
Increasing Clouds
- 54
- 73
Chance Thunderstorms
- 52
- 80
Rain Showers
- 44
- 62
Rain Showers Likely
- 47
- 65
Partly Sunny
- 51
- 68
Rain Showers Likely
- 50
- 68
Chance Rain Showers
Today 8 May Eastern Loudoun
Mostly sunny. Highs in the lower 70s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.
Tonight 8 May Eastern Loudoun
Partly cloudy. Lows in the lower 50s. South Winds 5 to 10 Mph.
Herndon Temperature Statistics
May Temperature
Washington/Dulles International Airport, DC (4.3 miles)
Lowest 1 May, 2026
38.6 °FAverage May
59.5 °FHighest 5 May, 2026
85.6 °F
Climate (2021–Present)
Washington/Dulles International Airport, DC (4.3 miles)
Average Low 2021–2026
47.5 °FAverage 2021–2026
58.2 °FAverage High 2021–2026
68.6 °F