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

Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

Sweeney Creek I-94 MP 112.6 (MTSWC)

Lat: 46.26671°NLon: 106.30788°WElev: 2598.0ft.

NA

62°F

17°C

Humidity 89%
Wind Speed N 0 MPH
Barometer NA
Dewpoint 59°F (15°C)
Visibility NA
Last update 18 Aug 03:15 AM MDT
Extended Forecast for

Forsyth MT

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 5pm. Patchy smoke after 3pm. Mostly cloudy, then gradually becoming sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Patchy smoke before 9pm. Mostly cloudy, with a low around 58. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 58 °F

    Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 90. Light and variable wind becoming west northwest 5 to 9 mph in the morning.

    High: 90 °F

    Hot

  • Wednesday Night

    Wednesday Night: Patchy smoke before 9pm. Mostly clear, with a low around 59. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 59 °F

    Patchy Smoke
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 95. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 95 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. North wind around 6 mph becoming light and variable after midnight.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 91. Light east northeast wind increasing to 5 to 9 mph in the morning.

    High: 91 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 65. East northeast wind around 11 mph.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. Calm wind.
Tuesday
A 20 percent chance of showers and thunderstorms after 5pm. Patchy smoke after 3pm. Mostly cloudy, then gradually becoming sunny, with a high near 86. Light and variable wind.
Tuesday Night
A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Patchy smoke before 9pm. Mostly cloudy, with a low around 58. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Wednesday
Mostly sunny and hot, with a high near 90. Light and variable wind becoming west northwest 5 to 9 mph in the morning.
Wednesday Night
Patchy smoke before 9pm. Mostly clear, with a low around 59. Northwest wind 5 to 7 mph becoming calm in the evening.
Thursday
Sunny and hot, with a high near 95. Calm wind becoming northwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 62. North wind around 6 mph becoming light and variable after midnight.
Friday
Sunny and hot, with a high near 91. Light east northeast wind increasing to 5 to 9 mph in the morning.
Friday Night
Partly cloudy, with a low around 65. East northeast wind around 11 mph.
Saturday
Partly sunny and hot, with a high near 94. East southeast wind around 11 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. East southeast wind 5 to 9 mph.
Sunday
Mostly sunny and hot, with a high near 91. Southwest wind 5 to 7 mph becoming north northwest in the afternoon.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62. Light and variable wind.
Monday
Mostly sunny and hot, with a high near 91. Calm wind becoming north northeast around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Forsyth MT
 46.27°N 106.69°W (Elev. 2500 ft)
Last Update:
12:46 am MDT Aug 18, 2026
Forecast Valid:
3am MDT Aug 18, 2026-6pm MDT Aug 24, 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