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 West Coast through 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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Collinsville IL

7 Day Forecast

For More Weather Information:

Saint Louis, MO Local Forecast Office

Overnight

Cloudy

Cloudy

Low: 34 °F

Sunday

Decreasing Clouds

Decreasing
Clouds

High: 45 °F

Sunday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 34 °F

Monday

Chance Rain Chance for Measurable Precipitation 50%

Chance
Rain

High: 49 °F

Monday
Night

Rain Likely Chance for Measurable Precipitation 60%

Rain
Likely

Low: 43 °F

Tuesday

Rain Likely Chance for Measurable Precipitation 60%

Rain
Likely

High: 46 °F

Tuesday
Night

Chance Rain/Snow Chance for Measurable Precipitation 50%

Chance
Rain/Snow

Low: 31 °F

Wednesday

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

High: 36 °F

Wednesday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 28 °F

Detailed Forecast

  • Overnight Cloudy, with a low around 34. Southeast wind around 6 mph.
  • Sunday Cloudy, then gradually becoming mostly sunny, with a high near 45. South wind 5 to 10 mph.
  • Sunday Night Mostly cloudy, with a low around 34. South wind around 7 mph.
  • Monday A 50 percent chance of rain. Cloudy, with a high near 49. South wind 7 to 13 mph, with gusts as high as 22 mph.
  • Monday Night Rain likely. Cloudy, with a low around 43. South wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 60%.
  • Tuesday Rain likely. Cloudy, with a high near 46. Chance of precipitation is 60%.
  • Tuesday Night A chance of rain before 7pm, then a chance of rain and snow between 7pm and midnight, then a chance of snow after midnight. Cloudy, with a low around 31. Chance of precipitation is 50%.
  • Wednesday A 30 percent chance of snow. Mostly cloudy, with a high near 36.
  • Wednesday Night Mostly cloudy, with a low around 28.
  • Christmas Day Mostly sunny, with a high near 42.
  • Thursday Night Mostly cloudy, with a low around 34.
  • Friday A chance of rain and snow. Partly sunny, with a high near 45. Chance of precipitation is 30%.
  • Friday Night A slight chance of rain and snow. Mostly cloudy, with a low around 26. Chance of precipitation is 20%.
  • Saturday Mostly sunny, with a high near 34.