Average temperature in Herndon
The mean minimum and maximum temperatures over the year in Herndon (Virginia), the United States of America.
- The months of May, June, August and September have nice average temperatures.
- On average, the warmest month(s) are June, July and August.
- On average, the warmest month is July with 31°C.
- On average, the coolest month is January with 6°C.
- The average annual maximum temperature is 19°C.
- The average annual minimum temperature is 8°C.
Forecast for Herndon
broken clouds and chance of slight rain
broken clouds and thunder
partly cloudy and thunder