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

Montague Siskiyou County Airport (KSIY)

Lat: 41.77375°NLon: 122.46817°WElev: 2644.0ft.

Clear

97°F

36°C

Humidity 13%
Wind Speed NW 6 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 19 Aug 06:20 PM PDT
Extended Forecast for

12 Miles NNE Yreka CA

Fire Weather Watch August 21, 02:00pm until August 21, 09:00pm
Click here for hazard details and duration
Fire Weather Watch

  • Tonight

    Tonight: Clear, with a low around 61. Northwest wind 5 to 14 mph, with gusts as high as 21 mph.

    Low: 61 °F

    Clear

  • Thursday

    Thursday: Increasing clouds and hot, with a high near 99. Calm wind becoming east southeast 5 to 7 mph in the afternoon.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 64. Northwest wind 6 to 9 mph.

    Low: 64 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 94. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon.

    High: 94 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. South southwest wind 8 to 13 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 55.

    Low: 55 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 61. Northwest wind 5 to 14 mph, with gusts as high as 21 mph.
Thursday
Increasing clouds and hot, with a high near 99. Calm wind becoming east southeast 5 to 7 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 64. Northwest wind 6 to 9 mph.
Friday
Mostly cloudy, with a high near 94. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon.
Friday Night
Mostly clear, with a low around 58. South southwest wind 8 to 13 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Saturday
Sunny, with a high near 89.
Saturday Night
Clear, with a low around 55.
Sunday
Sunny, with a high near 93.
Sunday Night
Mostly clear, with a low around 57.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 59.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
12 Miles NNE Yreka CA
 41.91°N 122.58°W (Elev. 2799 ft)
Last Update:
4:40 pm PDT Aug 19, 2026
Forecast Valid:
6pm PDT Aug 19, 2026-6pm PDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation