Port Byron, IL Weather Forecast
Local 7-day forecast
Chance Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Port Byron, IL in one place.
A chance of rain showers between 11am and 4pm. Mostly cloudy, with a high near 54. Northwest wind around 20 mph, with gusts as high as 40 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: Oct 15, 2026 6:06 PM CDT.
The active forecast window currently covers Oct 16 to Oct 21, 2026 for Port Byron, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 16 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 6:06 PM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Byron
Wednesday looks like the warmest upcoming period in Port Byron at 74 degrees F.
Friday Night is the coolest period ahead with temperatures near 34 degrees F.
The strongest winds are forecast for Friday at about 20 mph NW.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Oct 15, 2026 6:06 PM CDT
- Coverage
- 6 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
Areas of frost after 4am. Mostly clear, with a low around 34. North wind 5 to 20 mph, with gusts as high as 35 mph.
Widespread frost before 9am. Sunny, with a high near 57.
Clear, with a low around 39.
Sunny, with a high near 65.
Mostly clear, with a low around 44.
Mostly sunny, with a high near 68.
Partly cloudy, with a low around 46.
Mostly sunny, with a high near 72.
Mostly clear, with a low around 49.
Sunny, with a high near 74.
Mostly clear, with a low around 53.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Oct 16
|
Chance Rain Showers
|
54°F |
20 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear then Areas Of Frost
|
34°F |
5 to 20 mph
N
|
|
Saturday
Oct 17
|
Widespread Frost then Sunny
|
57°F |
0 to 5 mph
SW
|
|
Saturday Night
Oct 17
|
Clear
|
39°F |
5 to 10 mph
S
|
|
Sunday
Oct 18
|
Sunny
|
65°F |
10 to 15 mph
S
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
44°F |
5 to 10 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
68°F |
5 mph
S
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
46°F |
0 to 5 mph
S
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
72°F |
0 to 5 mph
SE
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
49°F |
0 to 5 mph
SE
|
|
Wednesday
Oct 21
|
Sunny
|
74°F |
5 to 10 mph
SE
|
|
Wednesday Night
Oct 21
|
Mostly Clear
|
53°F |
5 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Byron.
