Byron, IL Weather Forecast & Alerts

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

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Current Conditions — Byron, IL

FREEPORT (KFEP)

Partly Cloudy

69.6 F
Humidity:84%
Wind Speed: 13.9 G 19.7 mph
Barometer:29.55 in
Dewpoint:64.6 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 27 2026, 06:15 PM CDT
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5-Day Forecast — Byron, IL

Monday

High 68 °F
T-storms
Monday
Night
Low 48 °F
T-storms Likely
Tuesday

High 62 °F
Mostly Cloudy
Tuesday
Night
Low 44 °F
Slight Chance of Rain
Wednesday

High 60 °F
Partly Sunny
Wednesday
Night
Low 39 °F
Partly Cloudy
Thursday

High 59 °F
Mostly Cloudy
Thursday
Night
Low 37 °F
Mostly Cloudy
Friday

High 55 °F
Mostly Cloudy

Detailed Forecast — Byron, IL

Monday
Thunderstorms. High near 68°F. Wind 14 to 15 mph, with gusts as high as 26 mph.
Monday Night
Thunderstorms Likely. Low around 48°F. Wind 13 to 17 mph, with gusts as high as 26 mph.
Tuesday
Mostly Cloudy. High near 62°F. Wind 8 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
Slight Chance of Rain. Low around 44°F. Wind 5 to 7 mph, with gusts as high as 13 mph.
Wednesday
Partly Sunny. High near 60°F. Wind 8 to 13 mph, with gusts as high as 18 mph.
Wednesday Night
Partly Cloudy. Low around 39°F. Wind 3 to 5 mph, with gusts as high as 9 mph.
Thursday
Mostly Cloudy. High near 59°F. Wind 8 to 10 mph, with gusts as high as 16 mph.
Thursday Night
Mostly Cloudy. Low around 37°F. Wind around 2 mph, with gusts as high as 6 mph.
Friday
Mostly Cloudy. High near 55°F. Wind 7 to 9 mph, with gusts as high as 14 mph.
Friday Night
Partly Cloudy. Low around 35°F. Wind around 2 mph, with gusts as high as 5 mph.
Saturday
Partly Sunny. High near 59°F. Wind 5 to 9 mph, with gusts as high as 14 mph.
Saturday Night
Partly Cloudy. Low around 41°F. Wind around 5 mph, with gusts as high as 8 mph.
Sunday
Partly Sunny. High near 68°F. Wind 8 to 13 mph, with gusts as high as 18 mph.
Sunday Night
Slight Chance of Rain. Low around 46°F. Wind around 5 mph, with gusts as high as 9 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 27, 2026

Observation History — Byron, 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)
06:15 PM CDT 13.9 G 19.7 10.00 Partly Cloudy -- 69.6 64.6 84% NA NA 29.55 1000.7
05:55 PM CDT 19.7 G 25.3 10.00 Mostly Cloudy and Windy -- 70.3 64.8 83% NA 70.9 29.58 1001.7
05:35 PM CDT 21.9 G 26.4 10.00 Partly Cloudy and Windy -- 70.7 64.4 80% NA 71.2 29.58 1001.7
05:15 PM CDT 18.3 G 21.9 10.00 Cloudy -- 70.9 64.6 80% NA 71.4 29.57 1001.4
04:55 PM CDT 19.7 G 25.3 10.00 Cloudy and Windy -- 69.4 63.5 81% NA NA 29.57 1001.4
04:35 PM CDT 18.3 G 27.7 10.00 Cloudy -- 69.1 62.6 80% NA NA 29.57 1001.4
04:15 PM CDT 21.9 G 30.0 10.00 Mostly Cloudy and Windy -- 70.5 62.8 77% NA 70.9 29.56 1001.0
03:55 PM CDT G 31.1 10.00 Partly Cloudy -- 71.6 62.8 74% NA 72.0 29.55 1000.7
03:35 PM CDT S 19.7 G 28.9 10.00 Clear and Windy -- 70.0 63.1 79% NA NA 29.55 1000.7
03:15 PM CDT S 23.0 G 30.0 10.00 Partly Cloudy and Windy -- 69.6 63.5 81% NA NA 29.55 1000.7
02:55 PM CDT G 33.3 10.00 Mostly Cloudy -- NULL % NA NA M
02:35 PM CDT G 35.8 10.00 Partly Cloudy -- 68.5 62.4 81% NA NA 29.56 1001.0
02:15 PM CDT G 34.4 10.00 Partly Cloudy -- 67.1 62.4 85% NA NA 29.56 1001.0
01:55 PM CDT G 33.3 10.00 Clear -- 65.7 62.4 89% NA NA 29.56 1001.0
01:35 PM CDT 21.9 G 28.9 10.00 Partly Cloudy and Windy -- 63.7 62.2 95% NA NA 29.55 1000.7
01:15 PM CDT 17.2 G 27.7 10.00 Partly Cloudy -- 63.1 61.9 96% NA NA 29.54 1000.3
12:55 PM CDT SE 17.2 10.00 Mostly Cloudy -- 61.2 59.7 95% NA NA 29.54 1000.3
12:35 PM CDT G 35.8 10.00 Mostly Cloudy -- 59.5 58.1 95% NA NA M
12:15 PM CDT G 40.3 10.00 Mostly Cloudy -- 57.4 55.8 94% NA NA M
11:55 AM CDT G 51.9 3.00 Mostly Cloudy 00.23 55.8 54.5 96% NA NA M
11:35 AM CDT G 25.3 2.00 Cloudy 00.18 56.3 55.0 96% NA NA 29.76 1007.8
11:15 AM CDT S 16.1 G 20.8 3.00 Cloudy 00.07 56.5 55.4 96% NA NA 29.78 1008.5
10:55 AM CDT 16.1 1.50 Cloudy 00.13 57.0 55.6 95% NA NA 29.77 1008.1
10:35 AM CDT 16.1 10.00 Cloudy 00.01 58.1 55.0 90% NA NA 29.75 1007.5

Regional Weather Observation

FREEPORT (KFEP)

Partly Cloudy
69.6 F

ROCKFORD (KRFD)

Mostly Cloudy
66.2 F

MONROE (KEFT)

Partly Cloudy
68.9 F

JANESVILLE/ROCK (KJVL)

Cloudy
69.8 F

SAVANNA/TRITOWN (KSFY)

Cloudy
70.2 F

ROCHELLE/KORITZ (KRPJ)

Partly Cloudy
65.5 F
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