10-day forecast for Harper, IL: 28° to 80°, with precipitation expected on 2 days. The table below breaks each day into morning, afternoon, evening and overnight.
80°
Best day: Monday, October 12
70° · 0.56 in
Worst day: Thursday, October 15
Tap any day below to see morning, afternoon, evening and overnight.
Sat, 1077° / 59°0
Morning62°feels 61°
Afternoon77°feels 77°
Evening66°feels 65°
Overnight63°feels 62°
77 °
Harper, Saturday, 10 October
Overcast. High 77°, low 59°.
Pressure30.03 inHg
Wind13.1 mph S
Humidity56%
Visibility6.2 mi
Dew point57°
Sun, 1176° / 56°0
Morning56°feels 56°
Afternoon75°feels 75°
Evening66°feels 66°
Overnight62°feels 61°
76 °
Harper, Sunday, 11 October
Clear. High 76°, low 56°.
Pressure29.94 inHg
Wind6.6 mph S
Humidity61%
Visibility6.2 mi
Dew point58°
Mon, 1280° / 65°0
Morning66°feels 65°
Afternoon79°feels 79°
Evening73°feels 74°
Overnight65°feels 64°
80 °
Harper, Monday, 12 October
Overcast. High 80°, low 65°.
Pressure29.80 inHg
Wind11.8 mph SW
Humidity60%
Visibility6.2 mi
Dew point61°
Tue, 1373° / 66°0
Morning68°feels 69°
Afternoon73°feels 73°
Evening68°feels 68°
Overnight71°feels 71°
73 °
Harper, Tuesday, 13 October
Overcast. High 73°, low 66°.
Pressure29.85 inHg
Wind8.5 mph NW
Humidity75%
Visibility6.2 mi
Dew point64°
Wed, 1467° / 58°0.04
Morning62°feels 62°
Afternoon67°feels 66°
Evening62°feels 61°
Overnight59°feels 58°
67 °
Harper, Wednesday, 14 October
Light rain. High 67°, low 58°.
Pressure30.12 inHg
Wind9.3 mph NE
Humidity61%
Visibility—
Dew point53°
Thu, 1570° / 53°0.56
Morning54°feels 53°
Afternoon59°feels 59°
Evening69°feels 69°
Overnight63°feels 62°
70 °
Harper, Thursday, 15 October
Rain. High 70°, low 53°.
Pressure29.88 inHg
Wind20.2 mph SW
Humidity93%
Visibility—
Dew point54°
Fri, 1661° / 40°0.02
Morning46°feels 40°
Afternoon50°feels 46°
Evening44°feels 35°
Overnight41°feels 32°
61 °
Harper, Friday, 16 October
Light rain. High 61°, low 40°.
Pressure29.97 inHg
Wind23.4 mph W
Humidity52%
Visibility—
Dew point33°
Sat, 1743° / 34°0
Morning39°feels 29°
Afternoon42°feels 34°
Evening37°feels 31°
Overnight35°feels 28°
43 °
Harper, Saturday, 17 October
Overcast. High 43°, low 34°.
Pressure30.36 inHg
Wind22.5 mph W
Humidity52%
Visibility—
Dew point26°
Sun, 1846° / 28°0
Morning33°feels 29°
Afternoon44°feels 41°
Evening40°feels 36°
Overnight36°feels 31°
46 °
Harper, Sunday, 18 October
Partly cloudy. High 46°, low 28°.
Pressure30.50 inHg
Wind6.5 mph S
Humidity43%
Visibility—
Dew point22°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in Harper, IL around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.