Dahlgren, IL Weather Forecast & Alerts

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

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Current Conditions — Dahlgren, IL

MOUNT VERNON (KMVN)

Mostly Clear

53.6 F
Humidity:71%
Wind Speed:SW 5.7 mph
Barometer:30.09 in
Dewpoint:44.6 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 22 2026, 05:20 AM CDT
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5-Day Forecast — Dahlgren, IL

Wednesday

High 80 °F
Forecast Missing
Wednesday
Night
Low 55 °F
Mostly Clear
Thursday

High 82 °F
Mostly Sunny
Thursday
Night
Low 64 °F
Chance of Scattered T-storms
Friday

High 77 °F
T-storms
Friday
Night
Low 57 °F
Chance of Showers
Saturday

High 77 °F
Slight Chance of Showers
Saturday
Night
Low 53 °F
Partly Cloudy
Sunday

High 77 °F
Isolated T-storm

Detailed Forecast — Dahlgren, IL

Wednesday
Sunny. High near 80°F. Wind 8 to 12 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly Clear. Low around 55°F. Wind 5 to 7 mph, with gusts as high as 13 mph.
Thursday
Mostly Sunny. High near 82°F. Wind 6 to 15 mph, with gusts as high as 22 mph.
Thursday Night
Chance of Scattered Thunderstorms. Low around 64°F. Wind 10 to 12 mph, with gusts as high as 21 mph.
Friday
Thunderstorms. High near 77°F. Wind 7 to 15 mph, with gusts as high as 22 mph.
Friday Night
Chance of Showers. Low around 57°F. Wind around 5 mph, with gusts as high as 10 mph.
Saturday
Slight Chance of Showers. High near 77°F. Wind 6 to 8 mph, with gusts as high as 14 mph.
Saturday Night
Partly Cloudy. Low around 53°F. Wind around 5 mph, with gusts as high as 12 mph.
Sunday
Isolated T-storm. High near 77°F. Wind 7 to 9 mph, with gusts as high as 15 mph.
Sunday Night
Chance of Thunderstorms. Low around 60°F. Wind around 9 mph, with gusts as high as 17 mph.
Monday
Thunderstorms Likely. High near 78°F. Wind 13 to 16 mph, with gusts as high as 23 mph.
Monday Night
Chance of Showers. Low around 55°F. Wind around 10 mph, with gusts as high as 17 mph.
Tuesday
Mostly Sunny. High near 71°F. Wind 7 to 12 mph, with gusts as high as 17 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 22, 2026

Observation History — Dahlgren, 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)
05:20 AM CDT SW 5.7 10.00 Mostly Clear -- 53.6 44.6 71% NA NA 30.09 1019.0
05:15 AM CDT SW 6.9 10.00 Mostly Clear -- 53.6 44.6 71% NA NA 30.08 1018.6
05:10 AM CDT SW 6.9 10.00 Mostly Clear -- 53.6 44.6 71% NA NA 30.08 1018.6
05:05 AM CDT 6.9 10.00 Clear -- 53.6 44.6 71% NA NA 30.08 1018.6
05:00 AM CDT SW 5.7 10.00 Clear -- 53.6 44.6 71% NA NA 30.08 1018.6
04:50 AM CDT SW 5.7 10.00 Clear -- 53.6 44.6 71% NA NA 30.08 1018.6
04:30 AM CDT 5.7 10.00 Mostly Clear -- 55.4 44.6 67% NA NA 30.08 1018.6
04:20 AM CDT SW 5.7 10.00 Partly Cloudy -- 55.4 44.6 67% NA NA 30.07 1018.3
04:10 AM CDT SW 5.7 10.00 Partly Cloudy -- 55.4 44.6 67% NA NA 30.07 1018.3
04:05 AM CDT SW 5.7 10.00 Mostly Cloudy -- 55.4 44.6 67% NA NA 30.07 1018.3
04:00 AM CDT SW 5.7 10.00 Partly Cloudy -- 55.4 44.6 67% NA NA 30.07 1018.3
03:50 AM CDT SW 6.9 10.00 Clear -- 55.4 44.6 67% NA NA 30.07 1018.3
03:35 AM CDT SW 6.9 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
03:30 AM CDT SW 6.9 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
03:25 AM CDT SW 6.9 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
03:20 AM CDT SW 6.9 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
03:15 AM CDT SW 8.1 10.00 Clear -- 59.0 44.6 59% NA NA 30.07 1018.3
03:10 AM CDT SW 8.1 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
03:05 AM CDT SW 8.1 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
02:50 AM CDT SW 6.9 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
02:45 AM CDT SW 6.9 10.00 Clear -- 57.2 44.6 63% NA NA 30.07 1018.3
02:35 AM CDT SW 6.9 10.00 Clear -- 59.0 44.6 59% NA NA 30.07 1018.3
02:25 AM CDT SW 9.2 10.00 Clear -- 59.0 44.6 59% NA NA 30.07 1018.3
02:20 AM CDT SW 8.1 10.00 Clear -- 59.0 44.6 59% NA NA 30.07 1018.3

Regional Weather Observation

MOUNT VERNON (KMVN)

Mostly Clear
53.6 F

SALEM/LECKRONE (KSLO)

Cloudy
62.6 F

FAIRFIELD (KFWC)

Cloudy
59.4 F

CENTRALIA (KENL)

Mostly Cloudy
58.8 F

FLORA (KFOA)

Cloudy
62.6 F

OLNEY-NOBLE (KOLY)

Cloudy
64.4 F
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