Harper, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Harper, IL in one place.
Mostly sunny. High near 47, with temperatures falling to around 43 in the afternoon. North wind 10 to 15 mph, with gusts as high as 25 mph.
Local Weather Overview
This forecast page for Harper, 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: Nov 5, 2026 10:13 AM CST.
The active forecast window currently covers Nov 6 to Nov 11, 2026 for Harper, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 6 to Nov 11, 2026
- Latest sync
- Nov 5, 2026 10:13 AM CST
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Harper
Monday looks like the warmest upcoming period in Harper at 61 degrees F.
Friday Night is the coolest period ahead with temperatures near 26 degrees F.
The strongest winds are forecast for Friday at about 10 to 15 mph N.
The forecast from Nov 6 through Nov 11 stays mostly dry.
Forecast Details
- Last updated
- Nov 5, 2026 10:13 AM CST
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- 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 26. North northwest wind 0 to 10 mph.
Mostly sunny, with a high near 51. West northwest wind 0 to 5 mph.
Mostly clear, with a low around 32.
Sunny, with a high near 57.
Mostly clear, with a low around 33.
Sunny, with a high near 61.
Mostly clear, with a low around 39.
Sunny, with a high near 61.
Partly cloudy, with a low around 37.
Mostly sunny, with a high near 58.
Mostly clear, with a low around 38.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Nov 6
|
Mostly Sunny
|
47°F |
10 to 15 mph
N
|
|
Friday Night
Nov 6
|
Mostly Clear
|
26°F |
0 to 10 mph
NNW
|
|
Saturday
Nov 7
|
Mostly Sunny
|
51°F |
0 to 5 mph
WNW
|
|
Saturday Night
Nov 7
|
Mostly Clear
|
32°F |
0 to 5 mph
WSW
|
|
Sunday
Nov 8
|
Sunny
|
57°F |
5 to 10 mph
W
|
|
Sunday Night
Nov 8
|
Mostly Clear
|
33°F |
0 to 5 mph
WSW
|
|
Monday
Nov 9
|
Sunny
|
61°F |
0 to 15 mph
SW
|
|
Monday Night
Nov 9
|
Mostly Clear
|
39°F |
5 to 10 mph
WSW
|
|
Tuesday
Nov 10
|
Sunny
|
61°F |
0 to 5 mph
WNW
|
|
Tuesday Night
Nov 10
|
Partly Cloudy
|
37°F |
0 to 5 mph
NW
|
|
Veterans Day
Nov 11
|
Mostly Sunny
|
58°F |
0 to 5 mph
NW
|
|
Wednesday Night
Nov 11
|
Mostly Clear
|
38°F |
5 mph
WNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harper.