DECATUR, IL 62521 Weather Forecast & Current Conditions

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BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
543 PM CDT Wed Jun 17 2026

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
Southeastern Logan County in central Illinois...
Northern Christian County in central Illinois...
East central Sangamon County in central Illinois...
Northwestern Moultrie County in central Illinois...
Northern Shelby County in central Illinois...
Southwestern Piatt County in central Illinois...
Macon County in central Illinois...

* Until 645 PM CDT.

* At 543 PM CDT, a severe thunderstorm was located over Niantic, or
13 miles west of Decatur, moving east at 55 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.

* This severe thunderstorm will be near...
Decatur and Harristown around 550 PM CDT.
Mount Zion, Long Creek, and Decatur Airport around 555 PM CDT.

This includes Interstate 72 between mile markers 122 and 149.

This also includes Lincoln Trail Homestead State Park & Memorial and
Spitler Woods State Natural Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until 1000 PM CDT for central
Illinois.

&&

LAT...LON 3977 8930 3996 8923 3994 8859 3961 8864
TIME...MOT...LOC 2243Z 279DEG 47KT 3986 8919

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

DECATUR, IL
Current Weather

5:54 PM CDT JUN 17, 2026
Overcast
Thunder Heavy Rain
Mist
70°F
Feels Like: 70°F
Dewpoint: 68°F
Rel. Hum.: 93%
Visibility: 4 miles
Wind: NE at 9 mph
Pressure:
Last 72 hours

Local Area Snow Depth

Illinois Current Weather

Illinois MOS Forecast Weather


Regional Weather Maps


(Automated weather data from NWS/FAA)
10-Day model forecast maps
2025 Hurricanes

DECATUR, IL 62521
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Showers and thunderstorms this evening, then mostly clear after midnight. Some thunderstorms may be severe with damaging winds, large hail, and tornadoes. Breezy with lows in the lower 60s. West winds 15 to 25 mph with gusts up to 45 mph, diminishing to 10 to 15 mph after midnight. Chance of rain near 100 percent.
THURSDAY
Mostly sunny. Highs in the mid 70s. West winds 10 to 15 mph.
THURSDAY NIGHT
Mostly clear. Lows in the mid 50s. Northwest winds 5 to 10 mph.
JUNETEENTH
Sunny. Highs in the upper 70s. Northwest winds 5 to 10 mph.
FRIDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s. West winds 5 to 10 mph, becoming southwest after midnight.
SATURDAY
Mostly sunny. Highs in the lower 80s.
SATURDAY NIGHT
Mostly clear in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the lower 60s. Chance of rain 30 percent.
SUNDAY
A chance of thunderstorms. Showers. Highs in the upper 70s. Chance of rain 90 percent.
SUNDAY NIGHT
Showers likely with a chance of thunderstorms in the evening, then a chance of showers after midnight. Lows in the lower 60s. Chance of rain 70 percent.
MONDAY
Mostly sunny. Highs in the mid 70s.
MONDAY NIGHT
Mostly clear. Lows in the mid 50s.
TUESDAY THROUGH WEDNESDAY
Partly cloudy. Highs in the upper 70s. Lows in the upper 50s.

Visible Weather Satellite
DECATUR, IL 62521
Infrared Weather Satellite
DECATUR, IL 62521
NEXRAD Weather Radar
DECATUR, IL 62521

DECATUR, IL 3 hourly weather forecast

weather forecast created  8:00 AM EDT  6/17/2026
Wednesday
17 JUN 2026
DECATUR, IL 62521 weather forecast Day 1, 12 hours 1 PM 76° 78° Mostly Cloudy 95%
RAIN
***
0% Thunder
( 86% severe)
S   24 71% 66°
High 82° DECATUR, IL 62521 weather forecast Day 1, 15 hours 4 PM 81° 84° Mostly Cloudy SSW   25 63% 67°
Mostly Cloudy

Rain


Windy
DECATUR, IL 62521 weather forecast Day 1, 18 hours 7 PM 77° 79° Mostly Cloudy 84%
RAIN
***
0% Thunder
( 54% severe)
WSW   25 71% 67°
DECATUR, IL 62521 weather forecast Day 1, 21 hours 10 PM 72° 72° Partly Cloudy W   17 84% 67°
Thursday
18 JUN 2026
DECATUR, IL 62521 weather forecast Day 2, 0 hours 1 AM 68° 68° Partly Cloudy 4%

0% Thunder
( 3% severe)
W   13 84% 63°
Low 62° DECATUR, IL 62521 weather forecast Day 2, 3 hours 4 AM 64° 63° Partly Cloudy W   13 84% 59°
High 74° DECATUR, IL 62521 weather forecast Day 2, 6 hours 7 AM 64° 63° Partly Cloudy 1%

0% Thunder
( 1% severe)
W   13 84% 59°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 2, 9 hours 10 AM 69° 69° Partly Cloudy WNW   14 70% 59°
DECATUR, IL 62521 weather forecast Day 2, 12 hours 1 PM 71° 71° Partly Cloudy 2%

0% Thunder
( 5% severe)
WNW   13 66% 59°
DECATUR, IL 62521 weather forecast Day 2, 15 hours 4 PM 73° 73° Partly Cloudy WNW   13 59% 58°
DECATUR, IL 62521 weather forecast Day 2, 18 hours 7 PM 72° 72° Partly Cloudy 1%

0% Thunder
( 3% severe)
WNW   9 61% 58°
DECATUR, IL 62521 weather forecast Day 2, 21 hours 10 PM 64° 65° Clear NW   3 81% 58°
Friday
19 JUN 2026
DECATUR, IL 62521 weather forecast Day 3, 0 hours 1 AM 60° 61° Clear 0%

0% Thunder
( 2% severe)
NW   3 90% 57°
Low 56° DECATUR, IL 62521 weather forecast Day 3, 3 hours 4 AM 57° 57° Clear WNW   3 96% 56°
High 78° DECATUR, IL 62521 weather forecast Day 3, 6 hours 7 AM 60° 60° Clear 0%

0% Thunder
( 2% severe)
W   5 90% 57°

Partly Cloudy



DECATUR, IL 62521 weather forecast Day 3, 9 hours 10 AM 71° 71° Clear WNW   7 66% 59°
DECATUR, IL 62521 weather forecast Day 3, 15 hours 1 PM 76° 78° Partly Cloudy 0%

0% Thunder
( 11% severe)
WNW   9 52% 57°
DECATUR, IL 62521 weather forecast Day 3, 18 hours 4 PM 78° 79° Partly Cloudy WNW   10 47% 56°
DECATUR, IL 62521 weather forecast Day 3, 21 hours 7 PM 76° 78° Partly Cloudy     WNW   7 52% 57°

DECATUR, IL extended weather forecast

Saturday
20 JUN 2026
Sunday
21 JUN 2026
Monday
22 JUN 2026
Tuesday
23 JUN 2026
Wednesday
24 JUN 2026
Low 58° Low 63° Low 54° Low 57° Low 61°
High 80° High 71° High 76° High 78° High 78°
DECATUR, IL 62521 weather forecast Day 4 DECATUR, IL 62521 weather forecast Day 5 DECATUR, IL 62521 weather forecast Day 6 DECATUR, IL 62521 weather forecast Day 7 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Mostly Cloudy
24% Rain
Overcast
65% Rain
Clear
13% Rain
Partly Cloudy
25% Rain
Partly Cloudy
33% Rain
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