National Weather Service

News Headlines

2026 Skywarn Storm Spotter Classes underway! Check back often as new classes are added often.

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

54°F

12°C

Humidity	64%
Wind Speed	NW 9 mph
Barometer	30.08 in (1018.3 mb)
Dewpoint	42°F (6°C)
Visibility	10.00 mi
Wind Chill	51°F (11°C)
Last update	9 Jan 12:52 pm CST

More Information:

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

Extended Forecast for

Grand Tower IL

This Afternoon
High: 52 °F
Mostly Cloudy
Tonight
Low: 42 °F
Mostly Cloudy
then Slight
Chance
Showers
Saturday
High: 45 °F
Slight Chance
Showers then
Sunny
Saturday Night
Low: 27 °F
Mostly Clear
Sunday
High: 39 °F
Sunny
Sunday Night
Low: 24 °F
Mostly Clear
Monday
High: 50 °F
Sunny
Monday Night
Low: 34 °F
Mostly Clear
Tuesday
High: 57 °F
Mostly Sunny

Detailed Forecast

This Afternoon

Mostly cloudy, with a steady temperature around 52. North northeast wind 3 to 6 mph.

Tonight

A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 42. Light and variable wind.

Saturday

A 20 percent chance of showers before noon. Mostly cloudy, then gradually becoming sunny, with a steady temperature around 45. Light northwest wind increasing to 9 to 14 mph in the morning. Winds could gust as high as 23 mph.

Saturday Night

Mostly clear, with a low around 27. Northwest wind 6 to 11 mph, with gusts as high as 20 mph.

Sunday

Sunny, with a high near 39. Northwest wind 5 to 11 mph, with gusts as high as 21 mph.

Sunday Night

Mostly clear, with a low around 24. Calm wind becoming south southwest around 5 mph after midnight.

Monday

Sunny, with a high near 50. South southwest wind 6 to 10 mph, with gusts as high as 18 mph.

Monday Night

Mostly clear, with a low around 34. South southwest wind 8 to 10 mph.

Tuesday

Mostly sunny, with a high near 57. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.