Herndon Weather and Climate: A Comprehensive Guide
The climate in Herndon is marked by big temperature swings throughout the year.
Temperatures range from very warm during the warmest months
to cold in the cooler months.
It is also known for its large amounts of rain/snowfall.
Now, let’s explore all the climate details to give you a full picture.
Average maximum day and minimum night temperature
In Herndon, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 31°C in July to a chilly 6°C in the coolest month, January.
Nights are cooler, with lows often dropping to around -4°C during the colder months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Herndon experiences significant rain/snowfall throughout the year, averaging 1116 mm of precipitation annually. Herndon offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between October (134 mm) and February (63 mm) is not too significant, making the climate enjoyable for visitors and residents alike.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
For those who appreciate different seasons, Herndon serves as an ideal destination. Expect longer, more sun-filled days in June with an average of 9.4 hours of sunshine daily, and embrace the darker days in December, offering only 4.3 hours of daily sunlight. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in Herndon.
The city experiences its highest humidity in August, reaching 69%. In March, the humidity drops to its lowest level at 58%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
almost clear and no rain broken clouds and chance of slight snow overcast and no rainForecast for Herndon
3 m/s
2 m/s
3 m/s
The best time of year to visit Herndon in the United States of America
Other facts from our historical weather data:The hottest season / summer takes place in June, July, August and September.
July has an average maximum temperature of 31°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 6°C.
October tops the wettest month list with 134 mm of rainfall.
February is the driest month with 63 mm of precipitation.
June is the sunniest month with an average of 282 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
