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Hourly Forecast
Daylight Hours
06:57
Sunrise
19:09
Sunset
Moon
Waxing Crescent
12:43
Moonrise
21:20
Moonset
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Weather in Herndon today, September 16, 2026
Expect a mostly clear day in Herndon on September 16, 2026, with sunshine dominating from morning through evening. Cloud should stay limited, so the overall feel remains bright and settled. The morning looks comparatively open, with cloud near 3% around 10:00. Early outdoor plans have a better chance of staying dry and bright.
The day peaks near 31°C and cools toward 14°C. Relative humidity sits between 37% and 69%, reaching its peak around 10:00. Airflow remains manageable, reaching about 3.2 km/h around 10:00.
Through the afternoon skies look more workable, with cloud near 0% around 12:00. Later outdoor plans have a clearer window than the morning may have suggested. Views remain open at about 16.1 km. Expect sunrise at 06:57, sunset at 19:09, and 12 hours 11 minutes of sunlight today overall.
The practical takeaway for Herndon is a bright September 16, 2026, ideal for outdoor errands before temperatures ease from about 31°C.
Frequently asked questions about weather in Herndon
How warm does it get in Herndon?
The warmest month in Herndon is July, with average high temperatures of 32°C. The average temperature during this period is around 27°C.
How cold does it get in Herndon?
The coldest month in Herndon is January, with average low temperatures of -1°C. The average temperature during this period is around 2°C.
What is the wettest time of year in Herndon?
The wettest month in Herndon is July, with an average of 131mm of precipitation.
What is the driest time of year in Herndon?
The driest month in Herndon is November, with an average of 73mm of precipitation.
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