Live Weather & Forecast
Weather in Herndon
Virginia, United States · Real-time conditions & 3-day outlook
22°C
Feels like 22°C
71°F / Feels 71°F
Partly cloudy
Herndon, Virginia
🌞 Daytime
Updated: 2026-04-12 14:30
Humidity
38%
Wind
17.6 km/h S
Wind Gust
20.3 km/h
Pressure
1028 mb
Visibility
16 km
UV Index
6.5
(High)
Precipitation
0 mm
Cloud Cover
75%
Dew Point
9.7°C
Wind Degree
183°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
193.9 μg/m³
NO₂
4.2 μg/m³
O₃
131 μg/m³
SO₂
3.6 μg/m³
PM 2.5
8.5 μg/m³
PM 10
8.8 μg/m³
Weather Alerts 2
Met
· Moderate · Expected
Special Weather Statement issued April 12 at 1:43PM EDT by NWS Baltimore MD/Washington DC
The combination of 10 hour fuel moistures around 8 to 10 percent relative humidities around 30 to 39 percent, and wind gusts around 20 to 25 mph will lead to an increased risk for the rapid spread of wildfires on Monday. Residents and visitors are urged to properly dispose of cigarette butts, matches, and any other flammable items in appropriate containers. Additionally, exercise caution if opera...
Met
· Unknown · Unknown
Monitoring message only. Please disregard.
Monitoring message only. Please disregard.
Today's Hourly Forecast
24-hour breakdown for Herndon, Virginia
12 AM
12°
Clear
1 AM
11°
Clear
2 AM
10°
Clear
3 AM
9°
Clear
4 AM
9°
Clear
5 AM
9°
Clear
6 AM
8°
Clear
7 AM
9°
Sunny
8 AM
11°
Sunny
9 AM
13°
Sunny
10 AM
15°
Sunny
11 AM
18°
Sunny
12 PM
21°
Sunny
1 PM
23°
Sunny
2 PM
22°
Partly cloudy
3 PM
25°
Sunny
4 PM
25°
Sunny
5 PM
24°
Sunny
6 PM
22°
Sunny
7 PM
19°
Sunny
8 PM
18°
Overcast
9 PM
16°
Clear
10 PM
16°
Clear
11 PM
15°
Clear
3-Day Forecast
Daily overview for Herndon, Virginia
Today
Sunny
26°
/
8°
🌧️ 0% chance of rain
💧 Avg. humidity: 55%
💨 Max wind: 18.4 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:37 AM
🌇 Sunset: 07:44 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Cloudy
29°
/
13°
🌧️ 0% chance of rain
💧 Avg. humidity: 65%
💨 Max wind: 24.5 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.3
🌅 Sunrise: 06:36 AM
🌇 Sunset: 07:45 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Partly Cloudy
29°
/
18°
🌧️ 0% chance of rain
💧 Avg. humidity: 48%
💨 Max wind: 13.7 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.8
🌅 Sunrise: 06:34 AM
🌇 Sunset: 07:46 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Best Time to Visit Herndon
Plan your trip to Herndon, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Herndon?
Current conditions in Herndon: Partly cloudy, temperature 22°C, humidity 38%.
What is the best time to visit Herndon?
The best time to visit Herndon is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Herndon?
Herndon is located at approximately 39° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Herndon?
The wettest period in Herndon is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Herndon?
For visits to Herndon during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Herndon in?
Herndon is located in United States, in the state of Virginia.
What are the public holidays in Herndon in 2026?
View the 2026 public holidays for Herndon on our Holidays page.
What are the GPS coordinates used for the weather forecast in Herndon?
The weather forecast for Herndon uses coordinates 38.9695, -77.3859.