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

46.4 F
Humidity:61%
Wind Speed: 0.0 mph
Barometer:30.06 in
Dewpoint:33.8 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
May 1 2026, 09:45 AM 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)
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
08:45 AM CDT 3.4 10.00 Cloudy -- 42.8 35.6 76% 41.0 NA 30.06 1017.9
08:30 AM CDT 0.0 10.00 Cloudy -- 42.8 35.6 76% NA NA 30.05 1017.6
08:20 AM CDT 4.6 10.00 Cloudy -- 42.8 33.8 70% 40.1 NA 30.05 1017.6
08:10 AM CDT NW 4.6 10.00 Mostly Cloudy -- 42.8 33.8 70% 40.1 NA 30.05 1017.6
08:05 AM CDT 4.6 10.00 Mostly Cloudy -- 42.8 33.8 70% 40.1 NA 30.05 1017.6
08:00 AM CDT 4.6 10.00 Mostly Cloudy -- 41.0 33.8 75% 37.9 NA 30.05 1017.6
07:45 AM CDT 6.9 10.00 Cloudy -- 39.2 35.6 87% 34.2 NA 30.05 1017.6
07:40 AM CDT NW 5.7 10.00 Cloudy -- 39.2 35.6 87% 35.1 NA 30.05 1017.6
07:35 AM CDT NW 4.6 10.00 Cloudy -- 39.2 35.6 87% 35.8 NA 30.05 1017.6
07:30 AM CDT 5.7 10.00 Cloudy -- 39.2 35.6 87% 35.1 NA 30.05 1017.6
07:20 AM CDT NW 3.4 10.00 Cloudy -- 41.0 33.8 75% 39.0 NA 30.05 1017.6
07:05 AM CDT 0.0 10.00 Cloudy -- 41.0 33.8 75% NA NA 30.04 1017.3
07:00 AM CDT 3.4 10.00 Cloudy -- 39.2 33.8 81% 37.0 NA 30.04 1017.3
06:50 AM CDT 5.7 10.00 Mostly Cloudy -- 39.2 33.8 81% 35.1 NA 30.03 1016.9
06:45 AM CDT 6.9 10.00 Partly Cloudy -- 39.2 33.8 81% 34.2 NA 30.03 1016.9
06:35 AM CDT 8.1 10.00 Clear -- 37.4 32.0 81% 31.5 NA 30.03 1016.9
06:20 AM CDT 9.2 10.00 Clear -- 35.6 30.2 81% 28.6 NA 30.03 1016.9

Regional Weather Observation

CLINTON MUNI (KCWI)

Cloudy
46.4 F

DAVENPORT/QUAD C (KDVN)

Cloudy
46.4 F

MOLINE/QUAD CITY (KMLI)

Mostly Cloudy
46.4 F

SAVANNA/TRITOWN (KSFY)

Clear
49.3 F

DUBUQUE (KDBQ)

Cloudy
44.6 F

MUSCATINE (KMUT)

Cloudy
50.0 F
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