Williamstown, Pennsylvania Weather
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Weather Forecast for Williamstown, Pennsylvania : Washington County
Issued: 7:03 pm EDT Sep 4, 2025 Latitude: 39.9792407 Longitude: -80.040888 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
40% chance of rain on Tonight Clearing on Friday 80% chance of thunderstorms on Saturday Mostly Sunny on Sunday Morning Fog on Monday Morning Fog on Tuesday Sunny on Wednesday Patchy Fog on Thursday
Low: 57°F High: 83°F High: 66°F High: 70°F High: 71°F High: 76°F High: 79°F High: 79°F
Low: 57°F Low: 47°F Low: 43°F Low: 44°F Low: 48°F Low: 50°F  
Rain Clearing Thunderstorms Mostly Sunny Morning Fog Morning Fog Sunny Patchy Fog
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Current Conditions at
WASHINGTON - (KAFJ)
63°
Cloudy
as of 6:21 PM EDST
Rel. Humidity: 93%
Dew Point: 61°F
Visibility: 10 Miles
Pressure: 29.82 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 3100ft, Broken at 4600ft, Solid Overcast at 11000ft
40% chance of rain Tonight Tonight... A chance of showers before 8pm. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 57. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Clearing on Friday Friday... Cloudy through mid morning, then gradual clearing, with a high near 83. Southwest wind 5 to 14 mph.
80% chance of thunderstorms Friday Night Friday Night... Showers and thunderstorms likely before 2am, then showers and possibly a thunderstorm between 2am and 5am, then showers after 5am. Low around 57. Southwest wind 3 to 7 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
80% chance of thunderstorms Saturday Saturday... Showers before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. High near 66. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
30% chance of rain Saturday Night Saturday Night... A chance of showers or sprinkles before 8pm, then a chance of sprinkles between 8pm and 2am. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 47. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 70.
Morning Fog on Sunday Night Sunday Night... Patchy fog after 2am. Otherwise, mostly clear, with a low around 43.
Morning Fog on Monday Monday... Areas of fog before 9am. Otherwise, sunny, with a high near 71.
Morning Fog on Monday Night Monday Night... Patchy fog after 2am. Otherwise, mostly clear, with a low around 44.
Morning Fog on Tuesday Tuesday... Patchy fog before 9am. Otherwise, sunny, with a high near 76.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 48.
Sunny on Wednesday Wednesday... Sunny, with a high near 79.
Patchy Fog on Wednesday Night Wednesday Night... Patchy fog. Otherwise, mostly clear, with a low around 50.
Patchy Fog on Thursday Thursday... Patchy fog. Otherwise, sunny, with a high near 79.
Sun Almanac for Williamstown, Pennsylvania
Sunrise: 06:51 AM
Sunset: 7:47 PM
Civil Sunrise:06:24 AM
Civil Sunset: 8:14 PM
Nautical Sunrise: 05:51 AM
Nautical Sunset: 8:47 PM
Astro Sunrise: 05:17 AM
Astro Sunset: 9:21 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.