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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Lewiston, Lewiston-Nez Perce County Airport (KLWS)

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

Clear

57°F

14°C

Humidity 71%
Wind Speed N 0 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 18 Sep 03:35 AM PDT
Extended Forecast for

Lewiston ID

  • Overnight

    Overnight: Mostly clear, with a low around 54. Light and variable wind becoming southeast around 6 mph.

    Low: 54 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers before 11am. Sunny, with a high near 78. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 78 °F

    Slight Chance
    Showers then
    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 54. West wind around 5 mph becoming calm in the evening.

    Low: 54 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 80. Calm wind.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 54. Light and variable wind.

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 55.

    Low: 55 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 54. Light and variable wind becoming southeast around 6 mph.
Friday
A 20 percent chance of showers before 11am. Sunny, with a high near 78. Calm wind becoming northwest around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 54. West wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 80. Calm wind.
Saturday Night
Mostly clear, with a low around 54. Light and variable wind.
Sunday
Sunny, with a high near 84.
Sunday Night
Clear, with a low around 55.
Monday
Sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Partly cloudy, with a low around 54.
Thursday
Mostly sunny, with a high near 83.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lewiston ID
 46.39°N 116.97°W (Elev. 1407 ft)
Last Update:
3:26 am PDT Sep 18, 2026
Forecast Valid:
3am PDT Sep 18, 2026-6pm PDT Sep 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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