Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

66°F

19°C

Humidity	90%
Wind Speed	Calm
Barometer	29.77 in (1007.6 mb)
Dewpoint	63°F (17°C)
Visibility	10.00 mi
Last update	16 Jun 10:52 pm CDT

More Information:

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

Extended Forecast for

5 Miles WSW Saint Johns IL

Tonight
Low: 62 °F
Partly Cloudy
Wednesday
High: 90 °F
Sunny then
Sunny and
Breezy
Wednesday Night
Low: 72 °F
Showers and
Breezy
Thursday
High: 84 °F
Chance
Showers
Thursday Night
Low: 62 °F
Chance
Showers
Juneteenth
High: 84 °F
Sunny
Friday Night
Low: 62 °F
Mostly Clear
Saturday
High: 86 °F
Mostly Sunny
Saturday Night
Low: 67 °F
Mostly Clear
then Chance
Showers

Detailed Forecast

Tonight

Partly cloudy, with a low around 62. Calm wind.

Wednesday

Sunny, with a high near 90. Breezy, with a south southwest wind 6 to 16 mph increasing to 18 to 28 mph. Winds could gust as high as 40 mph.

Wednesday Night

Showers and thunderstorms, mainly before 3am. Low around 72. Breezy, with a west southwest wind 18 to 23 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 80%.

Thursday

A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Light and variable wind becoming west northwest 5 to 7 mph in the morning. Chance of precipitation is 40%.

Thursday Night

A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 62. North wind around 6 mph becoming calm in the evening.

Juneteenth

Sunny, with a high near 84. Calm wind becoming north northwest around 5 mph in the afternoon.

Friday Night

Mostly clear, with a low around 62. Light and variable wind.

Saturday

Mostly sunny, with a high near 86. Light south southwest wind.

Saturday Night

A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67. South southeast wind 3 to 5 mph.

Sunday

A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 84. South wind 5 to 11 mph, with gusts as high as 18 mph.

Sunday Night

Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 69. South wind 8 to 14 mph, with gusts as high as 20 mph.

Monday

A chance of showers and thunderstorms. Mostly cloudy, with a high near 84. East wind around 9 mph becoming north northwest in the morning.

Monday Night

A chance of showers. Partly cloudy, with a low around 65. North northeast wind 3 to 7 mph.

Tuesday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. North wind 3 to 5 mph.