Port Byron, IL Weather Forecast & Alerts

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

Current Conditions — Port Byron, IL

CLINTON MUNI (KCWI)

Cloudy

48.2 F
Humidity:50%
Wind Speed:W 6.9 mph
Barometer:30.06 in
Dewpoint:30.2 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:45.1 F
May 1 2026, 12:25 PM CDT
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5-Day Forecast — Port Byron, IL

Friday

High 55 °F
Slight Chance of Rain Showers
Friday
Night
Low 37 °F
Mostly Cloudy
Saturday

High 59 °F
Partly Sunny
Saturday
Night
Low 44 °F
Partly Cloudy
Sunday

High 71 °F
Isolated T-storm
Sunday
Night
Low 50 °F
Slight Chance of Showers
Monday

High 77 °F
Isolated T-storm
Monday
Night
Low 48 °F
Chance of Rain
Tuesday

High 62 °F
Chance of Rain Showers

Detailed Forecast — Port Byron, IL

Friday
Slight Chance of Rain Showers. High near 55°F. Wind 7 to 8 mph, with gusts as high as 13 mph.
Friday Night
Mostly Cloudy. Low around 37°F. Wind 3 to 6 mph, with gusts as high as 9 mph.
Saturday
Partly Sunny. High near 59°F. Wind 5 to 7 mph, with gusts as high as 12 mph.
Saturday Night
Partly Cloudy. Low around 44°F. Wind 6 to 10 mph, with gusts as high as 16 mph.
Sunday
Isolated T-storm. High near 71°F. Wind 9 to 15 mph, with gusts as high as 24 mph.
Sunday Night
Slight Chance of Showers. Low around 50°F. Wind around 6 mph, with gusts as high as 9 mph.
Monday
Isolated T-storm. High near 77°F. Wind 13 to 14 mph, with gusts as high as 24 mph.
Monday Night
Chance of Rain. Low around 48°F. Wind around 9 mph, with gusts as high as 14 mph.
Tuesday
Chance of Rain Showers. High near 62°F. Wind 9 to 12 mph, with gusts as high as 18 mph.
Tuesday Night
Chance of Rain. Low around 42°F. Wind around 6 mph, with gusts as high as 8 mph.
Wednesday
Slight Chance of Rain Showers. High near 60°F. Wind 10 to 13 mph, with gusts as high as 18 mph.
Wednesday Night
Partly Cloudy. Low around 41°F. Wind around 6 mph, with gusts as high as 9 mph.
Thursday
Partly Sunny. High near 62°F. Wind 8 to 14 mph, with gusts as high as 21 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • May 1, 2026

Observation History — Port 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)
12:25 PM CDT W 6.9 10.00 Cloudy -- 48.2 30.2 50% 45.1 NA 30.06 1017.9
12:20 PM CDT 6.9 10.00 Light Rain -- 46.4 33.8 61% 43.0 NA 30.06 1017.9
12:05 PM CDT SW 9.2 10.00 Cloudy -- 48.2 28.4 46% 44.1 NA 30.06 1017.9
12:00 PM CDT W 10.4 G 16.1 10.00 Cloudy -- 48.2 30.2 50% 43.7 NA 30.06 1017.9
11:50 AM CDT 6.9 10.00 Cloudy -- 48.2 30.2 50% 45.1 NA 30.06 1017.9
11:45 AM CDT NE 5.7 10.00 Cloudy -- 48.2 30.2 50% 45.7 NA 30.06 1017.9
11:40 AM CDT 5.7 10.00 Cloudy -- 50.0 32.0 50% NA NA 30.06 1017.9
11:35 AM CDT 8.1 10.00 Cloudy -- 50.0 32.0 50% NA NA 30.06 1017.9
11:20 AM CDT 3.4 10.00 Cloudy -- 50.0 30.2 46% NA NA 30.06 1017.9
11:10 AM CDT 4.6 10.00 Cloudy -- 48.2 32.0 53% 46.4 NA 30.06 1017.9
10:50 AM CDT NE 4.6 10.00 Cloudy -- 48.2 33.8 57% 46.4 NA 30.06 1017.9
10:35 AM CDT 3.4 10.00 Cloudy -- 48.2 33.8 57% 47.3 NA 30.06 1017.9
10:30 AM CDT SW 3.4 10.00 Mostly Cloudy -- 48.2 33.8 57% 47.3 NA 30.06 1017.9
10:20 AM CDT W 3.4 10.00 Mostly Cloudy -- 48.2 33.8 57% 47.3 NA 30.06 1017.9
10:10 AM CDT W 3.4 10.00 Mostly Cloudy -- 46.4 33.8 61% 45.1 NA 30.06 1017.9
10:00 AM CDT 0.0 10.00 Cloudy -- 46.4 33.8 61% NA NA 30.06 1017.9
09:50 AM CDT 0.0 10.00 Cloudy -- 46.4 35.6 66% NA NA 30.06 1017.9
09:45 AM CDT 0.0 10.00 Cloudy -- 46.4 33.8 61% NA NA 30.06 1017.9
09:35 AM CDT 3.4 10.00 Cloudy -- 46.4 35.6 66% 45.1 NA 30.06 1017.9
09:30 AM CDT 0.0 10.00 Cloudy -- 44.6 35.6 70% NA NA 30.06 1017.9
09:20 AM CDT 0.0 10.00 Mostly Cloudy -- 44.6 33.8 66% NA NA 30.06 1017.9
09:10 AM CDT W 3.4 10.00 Cloudy -- 44.6 35.6 70% 43.2 NA 30.06 1017.9
09:05 AM CDT W 3.4 10.00 Mostly Cloudy -- 44.6 35.6 70% 43.2 NA 30.06 1017.9
08:50 AM CDT W 3.4 10.00 Cloudy -- 42.8 33.8 70% 41.0 NA 30.06 1017.9

Regional Weather Observation

CLINTON MUNI (KCWI)

Cloudy
48.2 F

DAVENPORT/QUAD C (KDVN)

Cloudy
51.8 F

MOLINE/QUAD CITY (KMLI)

Cloudy
50.0 F

SAVANNA/TRITOWN (KSFY)

Cloudy
50.9 F

DUBUQUE (KDBQ)

Mostly Cloudy
50.0 F

MUSCATINE (KMUT)

Mostly Cloudy
51.8 F
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