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Day 1 Outlook • April 20, 2026
Day 2 Outlook • April 21, 2026
Day 3 Outlook • April 22, 2026
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National Weather Radar

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dBZ 5
75

Hazardous Weather Conditions

Current Conditions: THOMSON, ILLINOIS

SAVANNA/TRITOWN (KSFY)

Clear

32.0 F
Humidity:72%
Wind Speed: 0.0 mph
Barometer:30.29 in
Dewpoint:24.1 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 20 2026, 02:55 AM CDT
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5 Day Forecast for THOMSON, ILLINOIS (61285)

Monday

High 59 °F
Partly Sunny
Monday
Night
Low 46 °F
Mostly Cloudy
Tuesday

High 77 °F
Partly Sunny
Tuesday
Night
Low 50 °F
Mostly Clear
Wednesday

High 77 °F
Mostly Sunny
Wednesday
Night
Low 57 °F
Mostly Clear
Thursday

High 80 °F
Isolated T-storm
Thursday
Night
Low 57 °F
T-storms
Friday

High 68 °F
Chance of Rain Showers

Detailed Forecast for THOMSON, ILLINOIS (61285)

Monday
Partly Sunny. High near 59°F. Wind 2 to 9 mph, with gusts as high as 14 mph.
Monday Night
Mostly Cloudy. Low around 46°F. Wind 9 to 10 mph, with gusts as high as 21 mph.
Tuesday
Partly Sunny. High near 77°F. Wind 6 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly Clear. Low around 50°F. Wind around 3 mph, with gusts as high as 6 mph.
Wednesday
Mostly Sunny. High near 77°F. Wind 5 to 7 mph, with gusts as high as 12 mph.
Wednesday Night
Mostly Clear. Low around 57°F. Wind around 8 mph, with gusts as high as 14 mph.
Thursday
Isolated T-storm. High near 80°F. Wind 17 to 18 mph, with gusts as high as 26 mph.
Thursday Night
Thunderstorms. Low around 57°F. Wind around 15 mph, with gusts as high as 23 mph.
Friday
Chance of Rain Showers. High near 68°F. Wind 10 to 14 mph, with gusts as high as 20 mph.
Friday Night
Slight Chance of Showers. Low around 44°F. Wind around 6 mph, with gusts as high as 12 mph.
Saturday
Partly Sunny. High near 66°F. Wind 8 to 10 mph, with gusts as high as 16 mph.
Saturday Night
Mostly Cloudy. Low around 42°F. Wind around 6 mph, with gusts as high as 12 mph.
Sunday
Slight Chance of Showers. High near 64°F. Wind around 9 mph, with gusts as high as 14 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 20, 2026

Observation History for THOMSON, ILLINOIS

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
02:55 AM CDT 0.0 10.00 Clear -- 32.0 24.1 72% NA NA 30.29 1025.7
02:35 AM CDT 0.0 10.00 Clear -- 32.2 26.2 78% NA NA 30.29 1025.7
02:15 AM CDT 0.0 10.00 Clear -- 32.0 27.1 82% NA NA 30.29 1025.7
01:55 AM CDT 0.0 10.00 Clear -- 31.6 25.3 77% NA NA 30.29 1025.7
01:35 AM CDT 3.4 10.00 Clear -- 32.7 26.4 77% 29.7 NA 30.29 1025.7
01:15 AM CDT 3.4 10.00 Clear -- 36.3 22.1 56% 33.8 NA 30.29 1025.7
12:55 AM CDT 0.0 10.00 Clear -- 39.2 19.4 45% NA NA 30.29 1025.7
12:35 AM CDT 3.4 10.00 NULL -- 38.5 20.8 49% 36.3 NA 30.28 1025.4
12:15 AM CDT 0.0 10.00 Clear -- 39.2 20.7 47% NA NA 30.28 1025.4
11:55 PM CDT 4.7 10.00 Clear -- 40.1 20.3 45% 36.9 NA 30.28 1025.4
11:35 PM CDT 4.7 10.00 Clear -- 40.3 19.2 42% 37.0 NA 30.28 1025.4
11:15 PM CDT 4.7 10.00 Clear -- 41.0 19.8 42% 37.9 NA 30.27 1025.1
10:55 PM CDT 4.7 10.00 Clear -- 41.5 19.9 42% 38.5 NA 30.27 1025.1
10:35 PM CDT 5.8 10.00 Clear -- 42.1 19.9 41% 38.3 NA 30.27 1025.1
10:15 PM CDT 4.7 10.00 Clear -- 41.5 20.7 43% 38.5 NA 30.27 1025.1
09:55 PM CDT 5.8 10.00 Clear -- 41.9 21.2 43% 38.1 NA 30.26 1024.7
09:35 PM CDT 4.7 10.00 Clear -- 42.8 20.8 41% 39.9 NA 30.26 1024.7
09:15 PM CDT 4.7 10.00 Clear -- 43.3 21.6 42% 40.6 NA 30.25 1024.4
08:55 PM CDT 4.7 10.00 Clear -- 43.5 22.3 43% 40.8 NA 30.25 1024.1
08:35 PM CDT NW 6.9 10.00 Clear -- 46.0 21.7 38% 42.4 NA 30.23 1023.7
07:55 PM CDT NW 8.1 10.00 Partly Cloudy -- 46.4 20.1 35% 42.4 NA 30.21 1023.0
07:35 PM CDT 8.1 10.00 Mostly Cloudy -- 47.5 22.3 37% 43.7 NA 30.21 1023.0
06:35 PM CDT 12.8 G 18.3 10.00 Partly Cloudy -- 48.2 21.7 35% 43.0 NA 30.20 1022.7
06:15 PM CDT 11.4 G 18.3 10.00 Partly Cloudy -- 49.3 21.6 33% 44.8 NA 30.19 1022.4

Regional Weather Observation

SAVANNA/TRITOWN (KSFY)

Clear
32.0 F

DUBUQUE (KDBQ)

Clear
30.2 F

PLATTEVILLE (KPVB)

Clear
32.4 F

CLINTON MUNI (KCWI)

Clear
30.2 F

(KMRJ)


F

FREEPORT (KFEP)

Clear
32.7 F
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