10-day forecast for Shannon, IL: 57° to 87°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.
81°
Best day: Wednesday, August 12
82° · 0.38 in
Worst day: Sunday, August 9
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1087° / 71°0.18
Morning74°feels 76°
Afternoon85°feels 98°
Evening77°feels 79°
Overnight75°feels 77°
87 °
Shannon, Monday, 10 August
Rain. High 87°, low 71°.
Pressure29.88 inHg
Wind6.5 mph E
Humidity87%
Visibility6.2 mi
Dew point74°
Tue, 1182° / 70°0.07
Morning71°feels 73°
Afternoon78°feels 79°
Evening76°feels 78°
Overnight71°feels 73°
82 °
Shannon, Tuesday, 11 August
Light rain. High 82°, low 70°.
Pressure29.77 inHg
Wind14.2 mph SW
Humidity81%
Visibility6.2 mi
Dew point71°
Wed, 1281° / 67°0
Morning71°feels 72°
Afternoon82°feels 87°
Evening71°feels 71°
Overnight69°feels 71°
81 °
Shannon, Wednesday, 12 August
Overcast. High 81°, low 67°.
Pressure29.85 inHg
Wind5.6 mph NW
Humidity76%
Visibility6.2 mi
Dew point72°
Thu, 1374° / 60°0.06
Morning64°feels 64°
Afternoon73°feels 73°
Evening66°feels 67°
Overnight64°feels 64°
74 °
Shannon, Thursday, 13 August
Light rain. High 74°, low 60°.
Pressure30.03 inHg
Wind8.7 mph NE
Humidity66%
Visibility—
Dew point60°
Fri, 1473° / 57°0
Morning61°feels 61°
Afternoon71°feels 71°
Evening67°feels 67°
Overnight62°feels 62°
73 °
Shannon, Friday, 14 August
Overcast. High 73°, low 57°.
Pressure30.15 inHg
Wind9.9 mph E
Humidity61%
Visibility—
Dew point56°
Sat, 1574° / 57°0.03
Morning61°feels 61°
Afternoon72°feels 72°
Evening69°feels 69°
Overnight65°feels 65°
74 °
Shannon, Saturday, 15 August
Light rain. High 74°, low 57°.
Pressure30.21 inHg
Wind10.4 mph SE
Humidity64%
Visibility—
Dew point57°
Sun, 1675° / 63°0.03
Morning65°feels 66°
Afternoon71°feels 71°
Evening71°feels 72°
Overnight67°feels 68°
75 °
Shannon, Sunday, 16 August
Light rain. High 75°, low 63°.
Pressure30.09 inHg
Wind5.9 mph N
Humidity89%
Visibility—
Dew point66°
Mon, 1780° / 64°0
Morning68°feels 68°
Afternoon77°feels 78°
Evening73°feels 74°
Overnight67°feels 67°
80 °
Shannon, Monday, 17 August
Overcast. High 80°, low 64°.
Pressure30.09 inHg
Wind6.3 mph E
Humidity68%
Visibility—
Dew point64°
Tue, 1877° / 62°0.01
Morning65°feels 65°
Afternoon73°feels 74°
Evening75°feels 76°
Overnight68°feels 69°
77 °
Shannon, Tuesday, 18 August
Light rain. High 77°, low 62°.
Pressure30.00 inHg
Wind8.7 mph SE
Humidity87%
Visibility—
Dew point67°
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 Shannon, 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.