Weather forecast for 10 daysHerndon, VA

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 55°F
  • 36°F
AM Clouds / PM Sun
AM Clouds / PM Sun
  • Precip. probability: 15%
  • Precipitation: 0"
  • Wind: 16mphN 354°
  • Humidity: 51%
  • UV index: 4
  • Sunrise: 7:21 am EDT
  • Sunset: 6:28 pm EDT
  • ▼
On Saturday, October 17, the day will begin with cloud cover, but conditions will improve as the sun emerges later on.
Temperature span will be from a high of a mild 55.4°F to a low of an icy 35.6°F.
Forecast models suggest colder conditions, with a peak that mirrors November's climate average rather than October's.
Sunrise was at 7:21 am and sunset will be at 6:28 pm; the daylight will last for 11h and 7min.

Sunday Oct 18, 2026

  • 61°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 7mphN 11°
  • Humidity: 47%
  • UV index: 5
  • Sunrise: 7:22 am EDT
  • Sunset: 6:27 pm EDT
  • ▼
Tomorrow, in Herndon, conditions remain stable and sunny, with little cloud presence.
The highest temperature will be a comfortable 60.8°F, while the lowest anticipated temperature is an icy 37.4°F.
Tomorrow, the maximum temperature is anticipated to be relatively lower than the common October peak of 66°F.
Sunrise will be at 7:22 am and sunset at 6:27 pm; tomorrow's daylight will last for 11h and 5min.

10-day overview

Daily temperatures

Warmest day: Tuesday 72°C.
Coldest day: today 55°C.

Chance of precipitation

Highest chance: Sunday 25.10. 37%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 55°F
  • 36°F
AM Clouds / PM Sun
AM Clouds / PM Sun
  • Precip. probability: 15%
  • Precipitation: 0"
  • Wind: 16mphN 354°
  • Humidity: 51%
  • UV index: 4
  • Sunrise: 7:21 am EDT
  • Sunset: 6:28 pm EDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 61°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 7mphN 11°
  • Humidity: 47%
  • UV index: 5
  • Sunrise: 7:22 am EDT
  • Sunset: 6:27 pm EDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 66°F
  • 46°F
Sunny
Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 10mphN 357°
  • Humidity: 52%
  • UV index: 5
  • Sunrise: 7:23 am EDT
  • Sunset: 6:25 pm EDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 72°F
  • 46°F
Sunny
Sunny
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 11mphN 352°
  • Humidity: 44%
  • UV index: 4
  • Sunrise: 7:24 am EDT
  • Sunset: 6:24 pm EDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 66°F
  • 46°F
Sunny
Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 11mphN 3°
  • Humidity: 54%
  • UV index: 4
  • Sunrise: 7:25 am EDT
  • Sunset: 6:22 pm EDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 68°F
  • 48°F
Sunny
Sunny
  • Precip. probability: 12%
  • Precipitation: 0"
  • Wind: 10mphNNW 347°
  • Humidity: 50%
  • UV index: 4
  • Sunrise: 7:26 am EDT
  • Sunset: 6:21 pm EDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 66°F
  • 46°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 12%
  • Precipitation: 0"
  • Wind: 10mphN 0°
  • Humidity: 56%
  • UV index: 4
  • Sunrise: 7:27 am EDT
  • Sunset: 6:20 pm EDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 61°F
  • 45°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 23%
  • Precipitation: 0.08"
  • Wind: 9mphN 1°
  • Humidity: 66%
  • UV index: 4
  • Sunrise: 7:28 am EDT
  • Sunset: 6:18 pm EDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 63°F
  • 46°F
Showers
Showers
  • Precip. probability: 37%
  • Precipitation: 0.2"
  • Wind: 9mphN 353°
  • Humidity: 75%
  • UV index: 4
  • Sunrise: 7:29 am EDT
  • Sunset: 6:17 pm EDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 68°F
  • 52°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 24%
  • Precipitation: 0"
  • Wind: 8mphNNW 335°
  • Humidity: 73%
  • UV index: 4
  • Sunrise: 7:30 am EDT
  • Sunset: 6:16 pm EDT
  • ▼
Models point to a combination of mostly clear, gloomy and damp weather is forecasted.
Rainfall is predicted for next Saturday and Sunday.
Significant changes in temperature are expected over the next several days. Forecast highs will fluctuate between 55.4°F and 71.6°F, while the lowest night temperatures will vary also significantly, as the minimum temperature is expected to range between 35.6°F and 51.8°F.
Tuesday will be the warmest day, with a maximum temperature of 71.6°F; today is the coldest day, with a maximum temperature of 55.4°F.
Updated: Oct 17, 2026 @ 13:51:06 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Today, expect a cloudy morning, but by midday, the sun will begin to shine through.

Today, the highest temperature will be 55.4°F, while the lowest temperature will be 35.6°F.
The maximum temperature will be significantly lower than the average highest temperature of 66°F in October. The lowest temperature today will be also uncommonly lower than the average low of 49.1°F.

On Saturday, in Herndon, sunrise was at 7:21 am and sunset will be at 6:28 pm (EDT).

In Herndon, today, there will be 11h and 7min of daylight.

On Sunday, the outlook remains bright and sunny.

Tomorrow, the maximum temperature will be 60.8°F, while the minimum temperature will be 37.4°F.
The maximum temperature will be moderately lower than the average highest temperature of 66°F in October. Tomorrow, the lowest temperature will be significantly lower than the average low of 49.1°F.

On Sunday, in Herndon, sunrise will be at 7:22 am and sunset at 6:27 pm (EDT).

In Herndon, tomorrow, there will be 11h and 5min of daylight.