HARRISTOWN, IL 62537 Weather Forecast & Current Conditions

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DECATUR, IL
Current Weather

12:54 AM CDT JUN 9, 2026
Overcast
73°F
Feels Like: 73°F
Dewpoint: 70°F
Rel. Hum.: 90%
Visibility: 10 miles
Wind:
Pressure: 29.97 inches
Last 72 hours

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HARRISTOWN, IL 62537
Weather Forecast

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REST OF TONIGHT
Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Near steady temperature in the lower 70s. South winds 5 to 10 mph. Chance of rain 30 percent.
TUESDAY
Partly sunny with a slight chance of showers and thunderstorms. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 20 percent.
TUESDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the lower 70s. Southwest winds 5 to 10 mph. Chance of rain 20 percent.
WEDNESDAY
Sunny with highs in the lower 90s. Southwest winds 15 to 20 mph. Heat index values up to 101.
WEDNESDAY NIGHT
Mostly clear with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Humid with lows in the lower 70s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 40 percent.
THURSDAY
Mostly sunny. A chance of showers and thunderstorms in the afternoon. Breezy with highs in the lower 90s. Chance of rain 50 percent. Heat index values up to 100.
THURSDAY NIGHT
Showers with a chance of thunderstorms in the evening. Lows in the mid 60s. Chance of rain 80 percent.
FRIDAY THROUGH SATURDAY
Mostly clear. Highs in the mid 80s. Lows in the lower 60s.
SATURDAY NIGHT THROUGH SUNDAY NIGHT
Partly cloudy with a chance of showers. Lows in the lower 60s. Highs around 80. Chance of rain 30 percent.
MONDAY
Mostly sunny. Highs in the upper 70s.

Visible Weather Satellite
HARRISTOWN, IL 62537
Infrared Weather Satellite
HARRISTOWN, IL 62537
NEXRAD Weather Radar
HARRISTOWN, IL 62537

DECATUR, IL 3 hourly weather forecast

weather forecast created  8:00 PM EDT  6/ 8/2026
Tuesday
9 JUN 2026
HARRISTOWN, IL 62537 weather forecast Day 1, 0 hours 1 AM 71° 71° Mostly Cloudy 37%
RAIN
.01–.1 in
0% Thunder
( 29% severe)
S   8 93% 69°
Low 69° HARRISTOWN, IL 62537 weather forecast Day 1, 3 hours 4 AM 70° 70° Mostly Cloudy SSW   8 97% 69°
High 87° HARRISTOWN, IL 62537 weather forecast Day 1, 6 hours 7 AM 72° 72° Mostly Cloudy 9%

0% Thunder
( 20% severe)
SW   9 93% 70°

Mostly Cloudy



HARRISTOWN, IL 62537 weather forecast Day 1, 9 hours 10 AM 79° 82° Mostly Cloudy SW   10 82% 73°
HARRISTOWN, IL 62537 weather forecast Day 1, 12 hours 1 PM 84° 91° Mostly Cloudy 18%
RAIN
<.01 in
0% Thunder
( 43% severe)
SW   12 72% 74°
HARRISTOWN, IL 62537 weather forecast Day 1, 15 hours 4 PM 87° 95° Mostly Cloudy SW   12 65% 74°
HARRISTOWN, IL 62537 weather forecast Day 1, 18 hours 7 PM 86° 94° Partly Cloudy 28%
RAIN
1–2 in
0% Thunder
( 37% severe)
SW   8 68% 74°
HARRISTOWN, IL 62537 weather forecast Day 1, 21 hours 10 PM 78° 80° Mostly Cloudy SSW   7 85% 73°
Wednesday
10 JUN 2026
HARRISTOWN, IL 62537 weather forecast Day 2, 0 hours 1 AM 75° 75° Partly Cloudy 9%

0% Thunder
( 17% severe)
S   8 90% 72°
Low 72° HARRISTOWN, IL 62537 weather forecast Day 2, 3 hours 4 AM 74° 74° Partly Cloudy SSW   10 90% 71°
High 90° HARRISTOWN, IL 62537 weather forecast Day 2, 6 hours 7 AM 76° 77° Partly Cloudy 0%

0% Thunder
( 8% severe)
SSW   12 85% 71°

Partly Cloudy



HARRISTOWN, IL 62537 weather forecast Day 2, 9 hours 10 AM 84° 90° Partly Cloudy SW   15 70% 73°
HARRISTOWN, IL 62537 weather forecast Day 2, 12 hours 1 PM 88° 96° Partly Cloudy 4%

0% Thunder
( 42% severe)
SSW   17 61% 73°
HARRISTOWN, IL 62537 weather forecast Day 2, 15 hours 4 PM 90° 96° Partly Cloudy SSW   18 54% 71°
HARRISTOWN, IL 62537 weather forecast Day 2, 18 hours 7 PM 88° 93° Clear 31%
RAIN
***
0% Thunder
( 28% severe)
SSW   17 55% 70°
HARRISTOWN, IL 62537 weather forecast Day 2, 21 hours 10 PM 80° 83° Partly Cloudy SSW   15 69% 69°

DECATUR, IL extended weather forecast

Thursday
11 JUN 2026
Friday
12 JUN 2026
Saturday
13 JUN 2026
Sunday
14 JUN 2026
Monday
15 JUN 2026
Low 74° Low 64° Low 58° Low 60° Low 62°
High 93° High 82° High 83° High 78° High 78°
HARRISTOWN, IL 62537 weather forecast Day 3 HARRISTOWN, IL 62537 weather forecast Day 4 HARRISTOWN, IL 62537 weather forecast Day 5 HARRISTOWN, IL 62537 weather forecast Day 6 HARRISTOWN, IL 62537 weather forecast Day 7
Partly Cloudy
48% Rain
Partly Cloudy
62% Rain
Partly Cloudy
9% Rain
Overcast
53% Rain
Overcast
46% Rain
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