Posen, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Posen, IL in one place.
Sunny, with a high near 60. North wind 3 to 8 mph.
Local Weather Overview
This forecast page for Posen, 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 1:30 PM CDT.
The active forecast window currently covers Oct 17 to Oct 21, 2026 for Posen, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 17 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 1:30 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Posen
Wednesday looks like the warmest upcoming period in Posen at 78 degrees F.
Saturday Night is the coolest period ahead with temperatures near 34 degrees F.
The strongest winds are forecast for Saturday at about 3 to 8 mph N.
The forecast from Oct 17 through Oct 21 stays mostly dry.
Forecast Details
- Last updated
- Oct 15, 2026 1:30 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Clear, with a low around 34.
Sunny, with a high near 67.
Mostly clear, with a low around 37.
Sunny, with a high near 72.
Partly cloudy, with a low around 41.
Sunny, with a high near 74.
Mostly clear, with a low around 43.
Sunny, with a high near 78.
Mostly clear, with a low around 46.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Oct 17
|
Sunny
|
60°F |
3 to 8 mph
N
|
|
Saturday Night
Oct 17
|
Clear
|
34°F |
2 mph
E
|
|
Sunday
Oct 18
|
Sunny
|
67°F |
1 to 5 mph
SE
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
37°F |
3 mph
SE
|
|
Monday
Oct 19
|
Sunny
|
72°F |
0 to 5 mph
SE
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
41°F |
2 mph
E
|
|
Tuesday
Oct 20
|
Sunny
|
74°F |
2 mph
E
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
43°F |
1 mph
E
|
|
Wednesday
Oct 21
|
Sunny
|
78°F |
0 to 3 mph
SE
|
|
Wednesday Night
Oct 21
|
Mostly Clear
|
46°F |
2 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Posen.