Williamstown, PA Weather Forecast

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Williamstown, PA Weather Forecast

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Williamstown PA weather  - Mostly Cloudy - 62°F
Mostly Cloudy
62°F
Updated 10:04 am
Feels Like 52°F
Humidity 72%
Wind NW 9 mph
Barometer  30.04 in
Dew Point 53°F
Williamstown PA weather  - Mostly Cloudy - 17°C
Mostly Cloudy
17°C
Updated 10:04 am
Feels Like 11°C
Humidity 72%
Wind NW 14 km/h
Barometer  101.7 kPa
Dew Point 12°C

Williamstown Weather Forecast

TODAY TONIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT
Williamstown, PA Weather - Today Sunny Williamstown, PA Weather - Tonight Clear Williamstown, PA Weather - Tuesday Sunny Williamstown, PA Weather - Tuesday Night Clear Williamstown, PA Weather - Wednesday Sunny Williamstown, PA Weather - Wednesday Night Mostly Clear Williamstown, PA Weather - Thursday Sunny Williamstown, PA Weather - Thursday Night Mostly Clear Williamstown, PA Weather - Friday Sunny Williamstown, PA Weather - Friday Night Mostly Clear Williamstown, PA Weather - Saturday Sunny Williamstown, PA Weather - Saturday Night Partly Cloudy
Sunny Clear Sunny Clear Sunny Mostly Clear Sunny Mostly Clear Sunny Mostly Clear Sunny Partly Cloudy
Hi: 69°FHi: 21°C
Lo: 41°FLo: 5°C Hi: 61°FHi: 16°C
Lo: 41°FLo: 5°C Hi: 70°FHi: 21°C
Lo: 51°FLo: 11°C Hi: 71°FHi: 22°C
Lo: 49°FLo: 9°C Hi: 71°FHi: 22°C
Lo: 49°FLo: 9°C Hi: 69°FHi: 21°C
Lo: 49°FLo: 9°C
POP = Probability of Precipitation.
Weather Outlook Updated: 900 AM EDT Mon Oct 05 2026 Williamstown, PA Weather - WeatherWorld.com

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Williamstown Forecast Discussion

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Issued: 709 AM EDT Mon Oct 5 2026

Key Messages

1) Frost/freeze conditions are probable late tonight and early Tuesday morning over the western and central Alleghenies

2) Extended stretch of dry and seasonal Fall weather this week


Discussion

... KEY MESSAGE 1: Frost/freeze conditions are probable late tonight and early Tuesday morning over the western and central Alleghenies

As of 0730Z, a light southwesterly breeze developing just ahead of a SEWD-pushing cold front was helping to erode the northern and western edge of the widespread ...