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

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

Boise Air Terminal (KBOI)

Lat: 43.56704°NLon: 116.24053°WElev: 2822.0ft.

Clear

73°F

23°C

Humidity 25%
Wind Speed SE 8 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 20 Aug 03:05 AM MDT
Extended Forecast for

17 Miles SE Boise Municipal ID

Heat Advisory August 20, 12:00pm until August 21, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Patchy smoke. Mostly clear, with a steady temperature around 71. Northeast wind around 8 mph.

    Low: 71 °F

    Patchy Smoke

  • Thursday

    Thursday: Patchy smoke before 10am. Increasing clouds and hot, with a high near 100. East northeast wind 5 to 10 mph becoming south southwest in the afternoon.

    High: 100 °F

    Patchy Smoke
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 69. North northwest wind 6 to 11 mph becoming northeast after midnight.

    Low: 69 °F

    Mostly Cloudy

  • Friday

    Friday: Increasing clouds and hot, with a high near 101. Northeast wind 6 to 10 mph becoming southwest in the afternoon.

    High: 101 °F

    Hot

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 71. West wind 14 to 16 mph becoming east in the evening.

    Low: 71 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms. Partly sunny and hot, with a high near 95.

    High: 95 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 63.

    Low: 63 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy smoke. Mostly clear, with a steady temperature around 71. Northeast wind around 8 mph.
Thursday
Patchy smoke before 10am. Increasing clouds and hot, with a high near 100. East northeast wind 5 to 10 mph becoming south southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 69. North northwest wind 6 to 11 mph becoming northeast after midnight.
Friday
Increasing clouds and hot, with a high near 101. Northeast wind 6 to 10 mph becoming southwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 71. West wind 14 to 16 mph becoming east in the evening.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny and hot, with a high near 95.
Saturday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 63.
Sunday
Sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 60.
Monday
Mostly sunny and hot, with a high near 91.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Mostly sunny and hot, with a high near 92.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Mostly sunny and hot, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
17 Miles SE Boise Municipal ID
 43.38°N 115.98°W (Elev. 3389 ft)
Last Update:
12:29 am MDT Aug 20, 2026
Forecast Valid:
3am MDT Aug 20, 2026-6pm MDT Aug 26, 2026
 
Forecast Discussion
 
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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