National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Current conditions at

Lewiston, Lewiston-Nez Perce County Airport (KLWS)

Lat: 46.37472°NLon: 117.01444°WElev: 1437.0ft.

Clear

38°F

3°C

Humidity 92%
Wind Speed S 3 MPH
Barometer 29.68 in (1005.08 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 26 Dec 12:56 AM PST
Extended Forecast for

Lewiston ID

  • Overnight

    Overnight: Rain, mainly after 4am. Steady temperature around 41. East wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 41 °F

    Rain

  • Friday

    Friday: Rain, mainly after 4pm. High near 47. South wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 47 °F

    Rain

  • Friday Night

    Friday Night: Rain before 10pm, then rain and snow likely between 10pm and 1am, then snow likely after 1am. Low around 33. West wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 33 °F

    Rain/Snow

  • Saturday

    Saturday: A 40 percent chance of snow before 10am. Partly sunny, with a high near 37. West wind 11 to 14 mph, with gusts as high as 25 mph. New snow accumulation of less than a half inch possible.

    High: 37 °F

    Chance Snow
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 23. Southwest wind around 5 mph becoming calm in the evening.

    Low: 23 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Rain, mainly after 4am. Steady temperature around 41. East wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain, mainly after 4pm. High near 47. South wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain before 10pm, then rain and snow likely between 10pm and 1am, then snow likely after 1am. Low around 33. West wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Saturday
A 40 percent chance of snow before 10am. Partly sunny, with a high near 37. West wind 11 to 14 mph, with gusts as high as 25 mph. New snow accumulation of less than a half inch possible.
Saturday Night
Partly cloudy, with a low around 23. Southwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 34.
Sunday Night
Partly cloudy, with a low around 24.
Monday
Partly sunny, with a high near 37.
Monday Night
Mostly cloudy, with a low around 28.
Tuesday
Mostly cloudy, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 34.
New Year's Day
A 30 percent chance of rain. Mostly cloudy, with a high near 45.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewiston ID
 46.39°N 117°W (Elev. 1385 ft)
Last Update:
11:57 pm PST Dec 25, 2025
Forecast Valid:
1am PST Dec 26, 2025-6pm PST Jan 1, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation