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Herndon, PA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Herndon, a borough in Snyder County, Pennsylvania.

Overnight
50°F
Patchy Fog
Patchy fog. Partly cloudy, with a low around 50. North wind around 1 mph.

7-day forecast for Herndon

WhenTempForecastWindPrecip
Overnight 50°F Patchy Fog 1 mph N 0%
Saturday 74°F Patchy Fog then Partly Sunny 2 mph E 2%
Saturday Night 59°F Rain Showers 1 to 9 mph SE 81%
Sunday 73°F Rain Showers 3 to 9 mph S 93%
Sunday Night 52°F Showers And Thunderstorms 3 to 8 mph NW 90%
Monday 68°F Mostly Cloudy 7 mph N 13%
Monday Night 48°F Chance Rain Showers 5 mph NE 44%
Tuesday 61°F Chance Rain Showers 5 mph E 49%
Tuesday Night 47°F Chance Rain Showers 3 to 7 mph E 39%
Wednesday 61°F Chance Rain Showers 7 mph E 39%
Wednesday Night 47°F Chance Rain Showers 7 mph NE 34%
Thursday 62°F Chance Rain Showers 6 mph NE 36%
Thursday Night 46°F Chance Rain Showers 5 mph NE 36%
Friday 67°F Chance Rain Showers 6 mph N 28%

Forecast source: National Weather Service (api.weather.gov) for Herndon (40.712, -76.853). Updated through the day.

Growing snapshot for Herndon

Last spring frost
Apr 25
First fall frost
Oct 22
Growing season
178 days
Hardiness zone
6b

More local growing data for Herndon: nearby ZIP 17864 weather · frost dates · planting calendar · Pennsylvania frost dates

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Climate data from the nearest NOAA station, Selinsgrove 2 S, Pa (5.9 mi from Herndon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.