National Weather Service United States Department of Commerce

Heavy rain and mountain snow across the northwestern U.S. this weekend

A Pacific storm system will continue to impact the Pacific Northwest through late Sunday. Heavy rainfall could lead to flash flooding, river and small stream flooding, as well as mudslides and debris flows, especially over burn scars. At higher elevations, strong winds and heavy snowfall, with accumulations of 1 to 3 feet, could result in hazardous travel through mountain passes.
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Current Conditions

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Upper St. Clair PA

7 Day Forecast

For More Weather Information:

Pittsburgh, PA Local Forecast Office

Tonight

Mostly Cloudy

Mostly
Cloudy

Low: 27 °F

Monday

Mostly Cloudy

Mostly
Cloudy

High: 44 °F

Monday
Night

Cloudy

Cloudy

Low: 35 °F

Tuesday

Chance Showers Chance for Measurable Precipitation 40%

Chance
Showers

High: 56 °F

Tuesday
Night

Showers Chance for Measurable Precipitation 80%

Showers

Low: 47 °F

Wednesday

Showers Chance for Measurable Precipitation 80%

Showers

High: 57 °F

Wednesday
Night

Chance Showers Chance for Measurable Precipitation 40%

Chance
Showers

Low: 35 °F

Christmas
Day

Chance Rain/Snow Chance for Measurable Precipitation 40%

Chance
Rain/Snow

High: 36 °F

Thursday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 29 °F

Detailed Forecast

  • Tonight Mostly cloudy, with a low around 27. Calm wind becoming east 5 to 7 mph in the evening.
  • Monday Mostly cloudy, with a high near 44. Southeast wind 8 to 10 mph.
  • Monday Night Cloudy, with a low around 35. Southeast wind around 9 mph.
  • Tuesday A chance of showers, mainly after noon. Mostly cloudy, with a high near 56. Southeast wind 8 to 11 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
  • Tuesday Night Showers, mainly after 9pm. Low around 47. Southeast wind around 14 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
  • Wednesday Showers. High near 57. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
  • Wednesday Night A chance of showers. Cloudy, with a low around 35. Breezy. Chance of precipitation is 40%.
  • Christmas Day A chance of rain and snow showers. Cloudy, with a high near 36. Chance of precipitation is 40%.
  • Thursday Night Mostly cloudy, with a low around 29.
  • Friday Partly sunny, with a high near 46.
  • Friday Night A chance of rain and snow showers. Mostly cloudy, with a low around 32. Chance of precipitation is 40%.
  • Saturday A chance of rain and snow showers. Cloudy, with a high near 39. Chance of precipitation is 40%.
  • Saturday Night Cloudy, with a low around 27.
  • Sunday Mostly cloudy, with a high near 36.