Tri-County, IL 14 Day Weather
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Tri-County, IL Weather Forecast


Tri-County, IL Weather Forecast Dated: 553 AM Tue Sep 08 2026
Expect a mild stretch with a mix of sun and clouds and frequent chances of rain over the coming period. moderate humidity and no major pressure swings will dominate.
Tuesday, September 8, 2026
Mid-Morning
72°F 22°C
Overcast
Mid-Afternoon
88°F 31°C
Overcast
Early-Evening
82°F 28°C
Overcast
Warm and summery near 88°F 31°C, overcast throughout the day, with steady humidity and barometric pressure falling. Winds out of the SSE at 11 mph 17 km/h. Gusts up to 28 mph 44 km/h.
Wednesday, September 9, 2026
Mid-Morning
70°F 21°C
Light Showers
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
77°F 25°C
Overcast
Balmy with temperatures reaching 82°F 28°C, scattered morning showers before drying out later, with steady humidity and steady pressure. Winds switching from the W to the SSE at 3 mph 5 km/h.
Thursday, September 10, 2026
Mid-Morning
67°F 19°C
Overcast
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
71°F 22°C
Sunny
Enjoyable around 79°F 26°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds moving from the NE to the ENE at 8 mph 12 km/h.
Friday, September 11, 2026
Mid-Morning
68°F 20°C
Overcast
Mid-Afternoon
90°F 32°C
Partly Cloudy
Early-Evening
81°F 28°C
Sunny
Hot temperatures near 90°F 32°C, overcast in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and barometric pressure falling. Winds swinging from the SSE to the SE at 8 mph 13 km/h.
Saturday, September 12, 2026
Mid-Morning
68°F 20°C
Scattered Showers
Mid-Afternoon
84°F 29°C
Sunny
Early-Evening
81°F 27°C
Sunny
Quite warm reaching 84°F 29°C, feeling like 87°F 31°C during peak afternoon, scattered downpours possible, with lower humidity and steady pressure. Winds shifting from the N to the E at 8 mph 13 km/h.
Sunday, September 13, 2026
Mid-Morning
76°F 25°C
Overcast
Mid-Afternoon
94°F 35°C
Sunny
Early-Evening
91°F 33°C
Sunny
Very hot with a high of 94°F 35°C, feeling closer to 101°F 39°C in the humidity, overcast in the morning, sunny in the afternoon, and cloudy this evening, with lower humidity and barometric pressure falling. Winds turning from the SSE to the S at 13 mph 21 km/h. Gusts up to 30 mph 49 km/h.
Monday, September 14, 2026
Mid-Morning
82°F 28°C
Sunny
Mid-Afternoon
89°F 32°C
Partly Cloudy
Early-Evening
76°F 25°C
Overcast
Warm and summery around 89°F 32°C (feels like 93°F 34°C), partly cloudy in the morning, cloudy in the afternoon, and overcast this evening, with increasing humidity and steady pressure. Winds switching from the SSW to the NW at 15 mph 24 km/h. Gusts up to 26 mph 42 km/h.
Tuesday, September 15, 2026
Mid-Morning
51°F 11°C
Sunny
Mid-Afternoon
62°F 17°C
Overcast
Early-Evening
58°F 15°C
Sunny
Cool with a high near 62°F 17°C, partly cloudy through the afternoon, turning sunny this evening, with lower humidity and steady pressure. Winds moving from the NW to the ESE at 10 mph 16 km/h. Gusts up to 20 mph 32 km/h.
Wednesday, September 16, 2026
Mid-Morning
53°F 12°C
Sunny
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
61°F 16°C
Overcast
Refreshing around 66°F 19°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
58°F 14°C
Overcast
Mid-Afternoon
69°F 20°C
Sunny
Early-Evening
66°F 19°C
Sunny
Mild with a high of 69°F 20°C, overcast in the morning, sunny in the afternoon, and overcast this evening, with lower humidity and barometric pressure falling. Winds swinging from the SSE to the SE at 8 mph 12 km/h.
Friday, September 18, 2026
Mid-Morning
64°F 18°C
Overcast
Mid-Afternoon
63°F 17°C
Light Showers
Early-Evening
61°F 16°C
Light Showers
Comfortable at 63°F 17°C, clouds and showers taking over for the afternoon and evening, with increasing humidity and barometric pressure falling. Winds shifting from the S to the WSW at 10 mph 17 km/h.
Saturday, September 19, 2026
Mid-Morning
50°F 10°C
Overcast
Mid-Afternoon
57°F 14°C
Overcast
Early-Evening
53°F 12°C
Overcast
Crisp with a high near 57°F 14°C, overcast throughout the day, with lower humidity and steady pressure. Winds tapering down from SE 17 mph 27 km/h to NE 9 mph 15 km/h.
Sunday, September 20, 2026
Mid-Morning
51°F 10°C
Sunny
Mid-Afternoon
63°F 17°C
Sunny
Early-Evening
57°F 14°C
Sunny
Refreshing around 63°F 17°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds switching from the E to the ENE at 6 mph 9 km/h.
Monday, September 21, 2026
Mid-Morning
55°F 13°C
Sunny
Mid-Afternoon
69°F 21°C
Sunny
Early-Evening
63°F 18°C
Sunny
Mild temperatures up to 69°F 21°C, sunny throughout the day, with lower humidity and steady pressure.
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