10-day forecast for Illiana Heights, IL: 61° to 91°, with precipitation expected on 5 days. The table below breaks each day into morning, afternoon, evening and overnight.
87°
Best day: Tuesday, August 18
87° · 0.44 in
Worst day: Tuesday, August 11
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1091° / 74°0.27
Morning77°feels 79°
Afternoon91°feels 102°
Evening80°feels 87°
Overnight75°feels 77°
91 °
Illiana Heights, Monday, 10 August
Rain. High 91°, low 74°.
Pressure29.88 inHg
Wind8.1 mph W
Humidity64%
Visibility6.2 mi
Dew point73°
Tue, 1187° / 70°0.44
Morning74°feels 76°
Afternoon80°feels 85°
Evening76°feels 78°
Overnight72°feels 73°
87 °
Illiana Heights, Tuesday, 11 August
Rain. High 87°, low 70°.
Pressure29.83 inHg
Wind17 mph SW
Humidity61%
Visibility6.2 mi
Dew point72°
Wed, 1284° / 66°0
Morning71°feels 72°
Afternoon84°feels 88°
Evening71°feels 71°
Overnight68°feels 69°
84 °
Illiana Heights, Wednesday, 12 August
Partly cloudy. High 84°, low 66°.
Pressure29.88 inHg
Wind5.1 mph N
Humidity63%
Visibility6.2 mi
Dew point68°
Thu, 1383° / 63°0.24
Morning67°feels 67°
Afternoon83°feels 84°
Evening71°feels 72°
Overnight64°feels 64°
83 °
Illiana Heights, Thursday, 13 August
Rain. High 83°, low 63°.
Pressure29.97 inHg
Wind9.8 mph SE
Humidity49%
Visibility6.2 mi
Dew point59°
Fri, 1480° / 69°0.33
Morning73°feels 73°
Afternoon79°feels 80°
Evening76°feels 78°
Overnight71°feels 73°
80 °
Illiana Heights, Friday, 14 August
Rain. High 80°, low 69°.
Pressure30.03 inHg
Wind10.5 mph E
Humidity71%
Visibility—
Dew point68°
Sat, 1589° / 71°0.04
Morning76°feels 79°
Afternoon86°feels 93°
Evening84°feels 93°
Overnight80°feels 84°
89 °
Illiana Heights, Saturday, 15 August
Light rain. High 89°, low 71°.
Pressure29.94 inHg
Wind12.8 mph SW
Humidity61%
Visibility—
Dew point70°
Sun, 1685° / 69°0
Morning74°feels 75°
Afternoon75°feels 76°
Evening70°feels 71°
Overnight70°feels 70°
85 °
Illiana Heights, Sunday, 16 August
Light rain. High 85°, low 69°.
Pressure29.97 inHg
Wind17.1 mph SW
Humidity75%
Visibility—
Dew point67°
Mon, 1780° / 61°0
Morning67°feels 67°
Afternoon75°feels 76°
Evening75°feels 76°
Overnight71°feels 72°
80 °
Illiana Heights, Monday, 17 August
Overcast. High 80°, low 61°.
Pressure30.00 inHg
Wind12.4 mph SE
Humidity71%
Visibility—
Dew point64°
Tue, 1887° / 74°0
Morning82°feels 85°
Afternoon86°feels 91°
Evening80°feels 86°
Overnight75°feels 77°
87 °
Illiana Heights, Tuesday, 18 August
Overcast. High 87°, low 74°.
Pressure29.85 inHg
Wind15 mph SW
Humidity60%
Visibility—
Dew point70°
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 Illiana Heights, 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.