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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

Greenville Downtown Airport (KGMU)

Lat: 34.85°NLon: 82.35°WElev: 1010ft.

Fair

74°F

23°C

Humidity 97%
Wind Speed SW 5 mph
Barometer 30.03 in (1015.7 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 13 Aug 4:53 am EDT
Extended Forecast for

Simpsonville SC

  • Overnight

    Overnight: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Light southwest wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 87. Southwest wind 5 to 9 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers after 3am. Mostly cloudy, with a low around 72. West southwest wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 72 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 87. West southwest wind 3 to 5 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 71. Light and variable wind.

    Low: 71 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Sunny then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Light southwest wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 87. Southwest wind 5 to 9 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers after 3am. Mostly cloudy, with a low around 72. West southwest wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 87. West southwest wind 3 to 5 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 71. Light and variable wind.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 89.
Friday Night
A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 71.
Saturday
A 30 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86.
Saturday Night
A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 71.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 71.
Monday
Sunny, with a high near 90.
Monday Night
Partly cloudy, with a low around 71.
Tuesday
Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Simpsonville SC
 34.73°N 82.25°W (Elev. 810 ft)
Last Update:
1:27 am EDT Aug 13, 2025
Forecast Valid:
5am EDT Aug 13, 2025-6pm EDT 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