Port Byron, IL Weather Forecast
Local 7-day forecast
Mostly Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Port Byron, IL in one place.
A chance of showers and thunderstorms after noon. Mostly sunny. High near 91, with temperatures falling to around 89 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
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: Jul 17, 2026 10:49 AM CDT.
The active forecast window currently covers Jul 17 to Jul 23, 2026 for Port Byron, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 10:49 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Byron
Saturday looks like the warmest upcoming period in Port Byron at 93 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 61 degrees F.
The strongest winds are forecast for Monday at about 5 to 15 mph S.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 10:49 AM 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
A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 74. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms between 4pm and 5pm. Sunny. High near 93, with temperatures falling to around 90 in the afternoon. Heat index values as high as 100. Northwest wind around 10 mph. Chance of precipitation is 20%.
Mostly clear, with a low around 67. Northeast wind 5 to 10 mph.
Sunny, with a high near 87.
Partly cloudy, with a low around 69.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 87.
Mostly clear, with a low around 63.
Sunny, with a high near 81.
Mostly clear, with a low around 61.
Sunny, with a high near 82.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Jul 17
|
Mostly Sunny then Chance Showers And Thunderstorms
|
91°F |
5 to 10 mph
SW
|
|
Tonight
Jul 17
|
Chance Showers And Thunderstorms then Mostly Clear
|
74°F |
5 to 10 mph
SW
|
|
Saturday
Jul 18
|
Sunny then Slight Chance Showers And Thunderstorms
|
93°F |
10 mph
NW
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
67°F |
5 to 10 mph
NE
|
|
Sunday
Jul 19
|
Sunny
|
87°F |
5 mph
E
|
|
Sunday Night
Jul 19
|
Partly Cloudy
|
69°F |
5 mph
SE
|
|
Monday
Jul 20
|
Mostly Sunny then Chance Showers And Thunderstorms
|
92°F |
5 to 15 mph
S
|
|
Monday Night
Jul 20
|
Chance Showers And Thunderstorms
|
72°F |
10 mph
W
|
|
Tuesday
Jul 21
|
Slight Chance Showers And Thunderstorms then Sunny
|
87°F |
10 to 15 mph
NW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
63°F |
5 to 15 mph
N
|
|
Wednesday
Jul 22
|
Sunny
|
81°F |
5 to 10 mph
N
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
61°F |
0 to 5 mph
E
|
|
Thursday
Jul 23
|
Sunny
|
82°F |
5 mph
SE
|
|
Thursday Night
Jul 23
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
63°F |
5 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Byron.
