Harpster, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Harpster, IL in one place.
A chance of showers and thunderstorms. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Local Weather Overview
This forecast page for Harpster, 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: Apr 12, 2026 11:55 PM CDT.
The active forecast window currently covers Apr 16 to Apr 19, 2026 for Harpster, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 16 to Apr 19, 2026
- Latest sync
- Apr 12, 2026 11:55 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Harpster
Friday looks like the warmest upcoming period in Harpster at 86 degrees F.
Saturday Night is the coolest period ahead with temperatures near 41 degrees F.
The strongest winds are forecast for Friday at about 9 to 21 mph S.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 12, 2026 11:55 PM CDT
- Coverage
- 4 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 57.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 61.
Showers and thunderstorms likely. Mostly cloudy, with a high near 76.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 41.
A chance of rain showers before 7am. Mostly sunny, with a high near 59.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Apr 16
|
Chance Showers And Thunderstorms
|
79°F |
14 to 17 mph
SW
|
|
Thursday Night
Apr 16
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
57°F |
7 to 12 mph
SW
|
|
Friday
Apr 17
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
86°F |
9 to 21 mph
S
|
|
Friday Night
Apr 17
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
61°F |
17 mph
SSW
|
|
Saturday
Apr 18
|
Showers And Thunderstorms Likely
|
76°F |
16 to 21 mph
WSW
|
|
Saturday Night
Apr 18
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
41°F |
14 to 17 mph
WNW
|
|
Sunday
Apr 19
|
Chance Rain Showers then Mostly Sunny
|
59°F |
14 to 17 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harpster.