Harper, Illinois Weather
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Weather Forecast for Harper, Illinois : Ogle County
Issued: 4:41 am CDT Sep 16, 2025 Latitude: 42.1414135 Longitude: -89.6473371 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Wednesday Thursday Friday Saturday Sunday Monday
Sunny on Today Mostly Clear on Tonight Sunny on Wednesday Sunny on Thursday 30% chance of on Friday 20% chance of on Saturday Partly Sunny on Sunday Partly Sunny on Monday
High: 86°F Low: 58°F High: 85°F High: 87°F High: 81°F High: 79°F High: 80°F High: 81°F
Low: 58°F Low: 61°F Low: 61°F Low: 60°F Low: 62°F  
Sunny Mostly Clear Sunny Sunny Partly Sunny Partly Sunny Partly Sunny Partly Sunny
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Current Conditions at
STERLING ROCK - (KSQI)
61°
Clear
as of 6:56 AM CDST
Rel. Humidity: 93%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 30.23 in.
Flight Rule: VFR
Wind Data
5 MPH
100° East
Cloud Level(s): Clear
Current Conditions at
ROCHELLE MUNICIPAL ARPT - (KRPJ)
55°
Clear
Mist
as of 7:15 AM CDST
Rel. Humidity: 93%
Dew Point: 54°F
Visibility: 3 Miles
Pressure: 30.24 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Clear
Sunny on Today Today... Sunny, with a high near 86. Southeast wind around 5 mph.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 58. East northeast wind around 5 mph becoming calm in the evening.
Sunny on Wednesday Wednesday... Sunny, with a high near 85. Calm wind becoming east around 5 mph.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 58. East wind around 5 mph.
Sunny on Thursday Thursday... Sunny, with a high near 87. Southeast wind around 5 mph.
20% chance of rain Thursday Night Thursday Night... A 20 percent chance of showers after 1am. Partly cloudy, with a low around 61.
30% chance of Friday Friday... A 30 percent chance of showers, mainly after 1pm. Partly sunny, with a high near 81.
20% chance of rain Friday Night Friday Night... A chance of showers. Mostly cloudy, with a low around 61.
20% chance of Saturday Saturday... A chance of showers. Partly sunny, with a high near 79.
20% chance of thunderstorms Saturday Night Saturday Night... A chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Partly Sunny on Sunday Sunday... Partly sunny, with a high near 80.
20% chance of rain Sunday Night Sunday Night... A chance of showers. Mostly cloudy, with a low around 62.
Partly Sunny on Monday Monday... Partly sunny, with a high near 81.
Current Radar Image


Sun Almanac for Harper, Illinois
Sunrise: 06:40 AM
Sunset: 7:06 PM
Civil Sunrise:06:12 AM
Civil Sunset: 7:34 PM
Nautical Sunrise: 05:39 AM
Nautical Sunset: 8:07 PM
Astro Sunrise: 05:05 AM
Astro Sunset: 8:41 PM
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