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

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

68°F

20°C

Humidity	93%
Wind Speed	Calm
Barometer	30.05 in (1017.3 mb)
Dewpoint	66°F (19°C)
Visibility	10.00 mi
Last update	17 Aug 10:54 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Grafton IL

Tonight
Low: 64 °F
Decreasing
Clouds
Tuesday
High: 86 °F
Mostly Sunny
Tuesday Night
Low: 70 °F
Partly Cloudy
then Heavy
Rain
Wednesday
High: 82 °F
Heavy Rain
Wednesday Night
Low: 67 °F
Chance
T-storms
Thursday
High: 82 °F
Slight Chance
T-storms
Thursday Night
Low: 64 °F
Mostly Clear
Friday
High: 84 °F
Sunny
Friday Night
Low: 66 °F
Mostly Clear
then Slight
Chance
Showers

Detailed Forecast

Tonight

Mostly cloudy, then gradually becoming clear, with a low around 64. Calm wind.

Tuesday

Mostly sunny, with a high near 86. Calm wind becoming southwest around 6 mph in the morning.

Tuesday Night

Showers and thunderstorms likely, mainly after 4am. Some of the storms could produce heavy rainfall. Increasing clouds, with a low around 70. Southeast wind around 5 mph becoming light and variable. Chance of precipitation is 70%.

Wednesday

Showers and thunderstorms likely, mainly before 9am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 82. South wind 5 to 7 mph becoming north in the afternoon. Chance of precipitation is 60%.

Wednesday Night

A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Northeast wind 3 to 7 mph.

Thursday

A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 82.

Thursday Night

Mostly clear, with a low around 64.

Friday

Sunny, with a high near 84.

Friday Night

A 20 percent chance of showers after 1am. Mostly clear, with a low around 66.

Saturday

A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84.