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Heavy Rain in the Southern Appalachians; Heat Continues in the West; Monitoring Tropical Storm Erin

Heavy to excessive rain falling over the southern Appalachians may bring areas of flooding into Wednesday. Hot temperatures are in place through Wednesday across parts of the western U.S. and New England. Tropical Storm Erin is forecast to become a Hurricane by late this week as it moves westward across the central Atlantic Ocean. Monitor forecasts for any Puerto Rico or U.S. East Coast impacts. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville (KOXV)

Lat: 41.3°NLon: 93.12°WElev: 928ft.

Fair

77°F

25°C

Humidity 79%
Wind Speed NW 3 mph
Barometer 29.95 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 12 Aug 8:35 pm CDT
Extended Forecast for

5 Miles NW Marysville IA

  • Tonight

    Tonight: Isolated showers and thunderstorms before 10pm. Mostly clear, with a low around 61. North wind 3 to 5 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Isolated
    T-storms then
    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80. North wind 3 to 5 mph.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 82. Southeast wind 3 to 8 mph.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. Southeast wind around 7 mph.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

Detailed Forecast

Tonight
Isolated showers and thunderstorms before 10pm. Mostly clear, with a low around 61. North wind 3 to 5 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 80. North wind 3 to 5 mph.
Wednesday Night
Mostly clear, with a low around 61. Calm wind.
Thursday
Sunny, with a high near 82. Southeast wind 3 to 8 mph.
Thursday Night
Mostly clear, with a low around 65. Southeast wind around 7 mph.
Friday
Mostly sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 72.
Saturday
Mostly sunny, with a high near 92.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Mostly sunny, with a high near 91.
Sunday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Monday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NW Marysville IA
 41.23°N 93.02°W
Last Update:
6:24 pm CDT Aug 12, 2025
Forecast Valid:
8pm CDT Aug 12, 2025-6pm CDT Aug 19, 2025
 
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