Thomson, IL Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Thomson, IL.

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Current Conditions — Thomson, IL

SAVANNA/TRITOWN (KSFY)

Clear

68.4 F
Humidity:70%
Wind Speed: 6.9 mph
Barometer:29.95 in
Dewpoint:58.3 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 22 2026, 09:55 AM CDT
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5-Day Forecast — Thomson, IL

Wednesday

High 80 °F
Partly Sunny
Wednesday
Night
Low 57 °F
Partly Cloudy
Thursday

High 80 °F
Mostly Cloudy
Thursday
Night
Low 60 °F
T-storms Likely
Friday

High 73 °F
T-storms Likely
Friday
Night
Low 46 °F
Clear
Saturday

High 68 °F
Partly Sunny
Saturday
Night
Low 46 °F
Mostly Cloudy
Sunday

High 71 °F
Mostly Cloudy

Detailed Forecast — Thomson, IL

Wednesday
Partly Sunny. High near 80°F. Wind 3 to 6 mph, with gusts as high as 10 mph.
Wednesday Night
Partly Cloudy. Low around 57°F. Wind 6 to 7 mph, with gusts as high as 13 mph.
Thursday
Mostly Cloudy. High near 80°F. Wind 9 to 17 mph, with gusts as high as 25 mph.
Thursday Night
Thunderstorms Likely. Low around 60°F. Wind 12 to 14 mph, with gusts as high as 22 mph.
Friday
Thunderstorms Likely. High near 73°F. Wind 8 to 12 mph, with gusts as high as 17 mph.
Friday Night
Clear. Low around 46°F. Wind around 6 mph, with gusts as high as 10 mph.
Saturday
Partly Sunny. High near 68°F. Wind 5 to 9 mph, with gusts as high as 14 mph.
Saturday Night
Mostly Cloudy. Low around 46°F. Wind around 3 mph, with gusts as high as 6 mph.
Sunday
Mostly Cloudy. High near 71°F. Wind 12 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Rain Likely. Low around 53°F. Wind around 17 mph, with gusts as high as 25 mph.
Monday
Thunderstorms Likely. High near 71°F. Wind 16 to 17 mph, with gusts as high as 25 mph.
Monday Night
Chance of Rain. Low around 46°F. Wind around 15 mph, with gusts as high as 20 mph.
Tuesday
Partly Sunny. High near 64°F. Wind 8 to 14 mph, with gusts as high as 21 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 22, 2026

Observation History — Thomson, IL

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)
09:55 AM CDT 6.9 10.00 Clear -- 68.4 58.3 70% NA NA 29.95 1014.2
09:35 AM CDT NW 5.8 10.00 Clear -- 67.6 58.6 73% NA NA 29.95 1014.2
09:15 AM CDT W 8.1 10.00 NULL -- 66.4 58.3 75% NA NA 29.95 1014.2
08:35 AM CDT W 6.9 10.00 Partly Cloudy -- 64.8 58.1 79% NA NA 29.95 1014.2
08:15 AM CDT W 5.8 10.00 Partly Cloudy -- 63.5 57.4 80% NA NA 29.94 1013.9
07:55 AM CDT W 5.8 10.00 Clear -- 63.0 57.2 81% NA NA 29.94 1013.9
07:35 AM CDT W 8.1 10.00 Clear -- 62.6 57.2 83% NA NA 29.94 1013.9
07:15 AM CDT 5.8 10.00 Clear -- 62.1 57.0 84% NA NA 29.94 1013.6
06:55 AM CDT W 4.7 10.00 Clear -- 61.9 56.8 84% NA NA 29.94 1013.6
06:35 AM CDT 0.0 10.00 Clear -- 61.2 56.7 85% NA NA 29.92 1013.2
06:15 AM CDT SW 5.8 10.00 Clear -- 61.2 56.5 85% NA NA 29.91 1012.9
05:55 AM CDT SW 6.9 10.00 Clear -- 61.7 56.5 83% NA NA 29.91 1012.9
05:35 AM CDT SW 6.9 10.00 Clear -- 62.1 56.5 82% NA NA 29.90 1012.5
05:15 AM CDT SW 6.9 10.00 Clear -- 63.0 56.3 79% NA NA 29.89 1012.2
04:55 AM CDT SW 9.2 10.00 Clear -- 63.1 56.3 78% NA NA 29.89 1012.2
04:35 AM CDT 6.9 10.00 Clear -- 63.7 56.3 77% NA NA 29.89 1012.2
04:15 AM CDT 6.9 10.00 NULL -- 64.4 56.3 75% NA NA 29.88 1011.9
03:35 AM CDT 6.9 10.00 Clear 00.01 64.8 55.9 73% NA NA 29.88 1011.9
03:15 AM CDT 8.1 10.00 Clear -- 65.3 55.9 72% NA NA 29.87 1011.5
02:55 AM CDT SW 9.2 10.00 Clear -- 65.1 55.6 71% NA NA 29.87 1011.5
02:35 AM CDT SW 9.2 10.00 Clear -- 64.6 55.6 73% NA NA 29.87 1011.5
02:15 AM CDT 4.7 10.00 Clear -- 59.4 54.3 83% NA NA 29.88 1011.9
01:55 AM CDT 5.8 10.00 Clear -- 57.2 52.9 85% NA NA 29.88 1011.9
01:35 AM CDT 8.1 10.00 Clear -- 56.7 52.0 84% NA NA 29.88 1011.9

Regional Weather Observation

SAVANNA/TRITOWN (KSFY)

Clear
68.4 F

DUBUQUE (KDBQ)

Clear
64.4 F

PLATTEVILLE (KPVB)

Clear
61.9 F

CLINTON MUNI (KCWI)

Clear
62.6 F

(KMRJ)


F

FREEPORT (KFEP)

Clear
64.6 F
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