Weather forecast for 10 days
Herndon, PA

Weather forecast for the weekend

Saturday, Jun 21.

Partly Cloudy
5:34 am

8:43 pm
EDT
Partly Cloudy
88°F / 68°F
  • Wind: 6mph SW
  • Humidity: 62%
  • Precip. probability: 7%
  • Precipitation: 0"
  • UV index: 9
On Saturday, June 21, expect a mix of sun and clouds throughout the day.
Rain is not anticipated. Temperatures are expected to peak at a hot 87.8°F and drop to a minimum of an agreeable 68°F.
The weather on Saturday is hotter, with a maximum expected near 82.4°F - more like July than June.
Sunrise will be at 5:34 am and sunset at 8:43 pm; the daylight will last for 15h and 9min.

Sunday, Jun 22.

Partly Cloudy
5:35 am

8:43 pm
EDT
Partly Cloudy
91°F / 72°F
  • Wind: 6mph WSW
  • Humidity: 63%
  • Precip. probability: 15%
  • Precipitation: 0"
  • UV index: 9
On Sunday, June 22, moments of sunshine will break through the patchy clouds.
Rain is not predicted. The expected temperature range extends from a high of a humid 91.4°F to a low of an agreeable 71.6°F.
On Sunday, the forecast high deviates from June's norm and tracks July's average temperature of 82.4°F.
Sunrise will be at 5:35 am and sunset at 8:43 pm; the daylight will last for 15h and 9min.

Frequently asked questions

What is the weather forecast for Herndon for Saturday?
On Saturday, changing cloud patterns will allow for periods of sunshine.
Will it rain on Saturday?
No, it will not rain on Saturday.
What will be the highest temperature on Saturday?
On Saturday, the highest temperature will be 87.8°F, while the lowest temperature will be 68°F.
What is the weather forecast for Herndon for Sunday?
On Sunday, the sky will feature a blend of clouds and sunshine.
Will it rain on Sunday?
No, it will not rain on Sunday.
What will be the maximum temperature on Sunday?
On Sunday, the maximum temperature will be 91.4°F, while the minimum temperature will be 71.6°F.
What is the weather forecast for Herndon for the next ten days?
In Herndon, weather will be unstable, and a combination of turbulent, clear, damp and cloudy weather is anticipated for the next ten days.
Will it rain in the next ten days?
Rain is anticipated on Tuesday through Thursday, next Wednesday and Thursday in Herndon. With light precipitation of 0.24", next Thursday will be the day with the most rainfall.
How hot will it be in the next ten days?
The maximum temperature will range between 80.6°F and 95°F, as the minimum temperature will be between 59°F and 73.4°F.
Taking the humidity into consideration, the maximum feel-like temperature will range between 86°F and 116.6°F.
What will be the hottest and the coldest days?
The hottest days will be Monday and next Tuesday, with a maximum of 95°F. The coldest day will be tomorrow, with a maximum of 80.6°F.

Long-term weather forecast

TueJun 17.
  • min.
  • 66°F
Light Rain Early
Light Rain Early
  • Wind: 4mph SSW
  • Humidity: 99%
  • UV index: 0
  • Precip. probability: 81%
  • Precipitation: 0.04"
  • 5:34 am 8:42 pm EDT
WedJun 18.
  • 81°F
  • 68°F
Showers
Showers
  • Wind: 6mph SSW
  • Humidity: 86%
  • UV index: 7
  • Precip. probability: 59%
  • Precipitation: 0.2"
  • 5:34 am 8:42 pm EDT
ThuJun 19.
  • 82°F
  • 59°F
PM Thunderstorms
PM Thunderstorms
  • Wind: 11mph SW
  • Humidity: 72%
  • UV index: 8
  • Precip. probability: 46%
  • Precipitation: 0.16"
  • 5:34 am 8:43 pm EDT
FriJun 20.
  • 82°F
  • 63°F
Mostly Sunny
Mostly Sunny
  • Wind: 7mph WNW
  • Humidity: 61%
  • UV index: 9
  • Precip. probability: 7%
  • Precipitation: 0"
  • 5:34 am 8:43 pm EDT
SatJun 21.
  • 88°F
  • 68°F
Partly Cloudy
Partly Cloudy
  • Wind: 6mph SW
  • Humidity: 62%
  • UV index: 9
  • Precip. probability: 7%
  • Precipitation: 0"
  • 5:34 am 8:43 pm EDT
SunJun 22.
  • 91°F
  • 72°F
Partly Cloudy
Partly Cloudy
  • Wind: 6mph WSW
  • Humidity: 63%
  • UV index: 9
  • Precip. probability: 15%
  • Precipitation: 0"
  • 5:35 am 8:43 pm EDT
MonJun 23.
  • 95°F
  • 73°F
Sunny
Sunny
  • Wind: 5mph WNW
  • Humidity: 64%
  • UV index: 9
  • Precip. probability: 7%
  • Precipitation: 0"
  • 5:35 am 8:44 pm EDT
TueJun 24.
  • 95°F
  • 72°F
Sunny
Sunny
  • Wind: 6mph WNW
  • Humidity: 60%
  • UV index: 9
  • Precip. probability: 6%
  • Precipitation: 0"
  • 5:35 am 8:44 pm EDT
WedJun 25.
  • 91°F
  • 70°F
Isolated Thunderstorms
Isolated Thunderstorms
  • Wind: 5mph NW
  • Humidity: 64%
  • UV index: 9
  • Precip. probability: 36%
  • Precipitation: 0.12"
  • 5:36 am 8:44 pm EDT
ThuJun 26.
  • 84°F
  • 68°F
PM Thunderstorms
PM Thunderstorms
  • Wind: 6mph SW
  • Humidity: 70%
  • UV index: 9
  • Precip. probability: 41%
  • Precipitation: 0.24"
  • 5:36 am 8:44 pm EDT
Mixed conditions are forecasted for the coming ten days, and a mix of unstable, clear, showery and dull weather is forecasted.
Rain is predicted for Tuesday through Thursday, next Wednesday and Thursday.
Expect a substantial fluctuation in daytime highs in the upcoming period. Highs will range from 80.6°F to 95°F, while the nightly low temperatures will show also a considerable swing, as nighttime lows are forecast to fall between 59°F and 73.4°F.
With a maximum temperature of 95°F, Monday and next Tuesday will be the hottest days in Herndon; the coldest day will be Wednesday, with a maximum of 80.6°F.
Including the humidity's impact, the maximum feel-like temperature may increase significantly and range between a tropical 86°F and a dangerously hot 116.6°F.
Updated: Jun 18, 2025 @ 03:53:00 UTC
Published by: Weather U.S. | About Us
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