Heavy Rain and Flash Flooding in the West; Heat Expands in the Central U.S.

Monsoonal moisture will produce showers and thunderstorms with heavy rain over parts of the Southwest, Great Basin, and Central Rockies through Monday. Flash flooding is possible, especially in and around burn scars and in areas of steep terrain. Heat will persist across the Central U.S. early this week, spreading into the Ohio Valley and Mid-Atlantic later this week. Read More >

Current conditions at

Mason, Mason Jewett Field Airport (KTEW)

Lat: 42.57°NLon: 84.42°WElev: 919ft.

Fair

75°F

24°C

Humidity 68%
Wind Speed Calm
Barometer 29.99 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 30 Aug 7:55 pm EDT
Extended Forecast for

Onondaga MI

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers and thunderstorms after 3am.  Mostly cloudy, with a low around 69. South wind 3 to 6 mph.  Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

  • Monday

    Monday: A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm.  Partly sunny, with a high near 87. South southwest wind 6 to 10 mph, with gusts as high as 22 mph.  Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 72. Southwest wind 6 to 8 mph, with gusts as high as 21 mph.

    Low: 72 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 2pm.  Mostly sunny and hot, with a high near 90. Heat index values as high as 96. West southwest wind 6 to 9 mph, with gusts as high as 20 mph.

    High: 90 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 10 percent chance of showers and thunderstorms before 8pm.  Partly cloudy, with a low around 71. West southwest wind around 6 mph becoming calm  in the evening.

    Low: 71 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 92.

    High: 92 °F

    Hot

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers before 2pm.  Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers after 8pm.  Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 2am, then a slight chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 69. South wind 3 to 6 mph. Chance of precipitation is 30%.
Monday
A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 87. South southwest wind 6 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 72. Southwest wind 6 to 8 mph, with gusts as high as 21 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 90. Heat index values as high as 96. West southwest wind 6 to 9 mph, with gusts as high as 20 mph.
Tuesday Night
A 10 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. West southwest wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny and hot, with a high near 92.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Thursday
A chance of showers before 2pm. Partly sunny, with a high near 86.
Thursday Night
A chance of showers after 8pm. Partly cloudy, with a low around 64.
Friday
Partly sunny, with a high near 83.
Friday Night
Partly cloudy, with a low around 61.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Onondaga MI
 42.45°N 84.56°W (Elev. 899 ft)
8:03 pm EDT Aug 30, 2026
8pm EDT Aug 30, 2026-6pm EDT Sep 6, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database