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

Areas of Excessive Rainfall and Extreme Heat; Monitoring Tropical Storm Erin

Heavy to excessive rainfall over the southern Appalachians may bring areas of flooding Tuesday. Hot to extremely hot temperatures are in place through Tuesday across much of the western U.S. and northern New England. Tropical Storm Erin is forecast to become a Major Hurricane by this weekend as it moves across the central Atlantic Ocean. Monitor future forecasts for any East Coast impacts. Read More >

Hazardous Weather Conditions

Current conditions at

Athens McMinn County Airport (KMMI)

Lat: 35.4°NLon: 84.56°WElev: 874ft.

Fair

75°F

24°C

Humidity 83%
Wind Speed Calm
Barometer 30.10 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 12 Aug 2:35 am EDT
Extended Forecast for

Decatur TNSimilar City Names

  • Overnight

    Overnight: A chance of sprinkles between 4am and 5am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 10%.

    Low: 72 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Showers and thunderstorms likely before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then showers and thunderstorms likely after 5pm. Patchy fog between 9am and 10am. High near 86. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 86 °F

    Chance
    Showers and
    Patchy Fog
    then T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 2pm. Mostly cloudy, with a high near 88. Heat index values as high as 96. Calm wind becoming southwest around 5 mph. Chance of precipitation is 70%.

    High: 88 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 60%.

    Low: 70 °F

    T-storms
    Likely then
    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Partly sunny and hot, with a high near 90. Calm wind. Chance of precipitation is 50%.

    High: 90 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 93.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

Detailed Forecast

Overnight
A chance of sprinkles between 4am and 5am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 10%.
Tuesday
Showers and thunderstorms likely before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then showers and thunderstorms likely after 5pm. Patchy fog between 9am and 10am. High near 86. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Calm wind.
Wednesday
Showers and thunderstorms likely, mainly after 2pm. Mostly cloudy, with a high near 88. Heat index values as high as 96. Calm wind becoming southwest around 5 mph. Chance of precipitation is 70%.
Wednesday Night
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 60%.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 11am. Partly sunny and hot, with a high near 90. Calm wind. Chance of precipitation is 50%.
Thursday Night
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. Calm wind.
Friday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 93.
Friday Night
Partly cloudy, with a low around 71.
Saturday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 94.
Saturday Night
Mostly clear, with a low around 71.
Sunday
A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 93.
Sunday Night
A 10 percent chance of showers and thunderstorms. Mostly clear, with a low around 71.
Monday
A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 94.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur TNSimilar City Names
 35.52°N 84.79°W (Elev. 778 ft)
Last Update:
1:38 am EDT Aug 12, 2025
Forecast Valid:
2am EDT Aug 12, 2025-6pm EDT Aug 18, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

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Chance of Precipitation