Port Byron, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Port Byron, IL in one place.
Sunny. High near 83, with temperatures falling to around 81 in the afternoon. East wind 5 to 10 mph.
Local Weather Overview
This forecast page for Port Byron, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jun 1, 2026 9:20 PM CDT.
The active forecast window currently covers Jun 2 to Jun 8, 2026 for Port Byron, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 2 to Jun 8, 2026
- Latest sync
- Jun 1, 2026 9:20 PM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Byron
Monday looks like the warmest upcoming period in Port Byron at 90 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Thursday at about 5 to 15 mph S.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 1, 2026 9:20 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- DVN
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 55. East wind 5 to 10 mph.
Sunny, with a high near 84. Southeast wind 5 to 10 mph.
Mostly clear, with a low around 59.
Mostly sunny, with a high near 89.
A chance of rain showers after 1am. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
A chance of rain showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. Chance of precipitation is 60%.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jun 2
|
Sunny
|
83°F |
5 to 10 mph
E
|
|
Tuesday Night
Jun 2
|
Mostly Clear
|
55°F |
5 to 10 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
84°F |
5 to 10 mph
SE
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
59°F |
5 to 10 mph
S
|
|
Thursday
Jun 4
|
Mostly Sunny
|
89°F |
5 to 15 mph
S
|
|
Thursday Night
Jun 4
|
Partly Cloudy then Chance Rain Showers
|
66°F |
10 mph
S
|
|
Friday
Jun 5
|
Chance Showers And Thunderstorms
|
88°F |
10 mph
SW
|
|
Friday Night
Jun 5
|
Chance Showers And Thunderstorms
|
66°F |
5 to 10 mph
SW
|
|
Saturday
Jun 6
|
Showers And Thunderstorms Likely
|
88°F |
10 mph
SW
|
|
Saturday Night
Jun 6
|
Chance Showers And Thunderstorms
|
65°F |
5 to 10 mph
S
|
|
Sunday
Jun 7
|
Chance Showers And Thunderstorms
|
89°F |
5 to 10 mph
SE
|
|
Sunday Night
Jun 7
|
Chance Showers And Thunderstorms
|
66°F |
5 to 10 mph
SE
|
|
Monday
Jun 8
|
Chance Showers And Thunderstorms
|
90°F |
10 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Byron.
