Mountain, IL 14 Day Weather
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Mountain, IL Weather Forecast


Mountain, IL Weather Forecast Dated: 1217 AM Sat Sep 12 2026
Expect a very warm period with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.
Saturday, September 12, 2026
Mid-Morning
74°F 24°C
Partly Cloudy
Mid-Afternoon
91°F 33°C
Overcast
Early-Evening
82°F 28°C
Sunny
Very hot with temperatures reaching 91°F 33°C, partly cloudy in the morning, overcast in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure. Winds turning from the SW to the N at 8 mph 13 km/h.
Sunday, September 13, 2026
Mid-Morning
70°F 21°C
Overcast
Mid-Afternoon
75°F 24°C
Overcast
Early-Evening
71°F 22°C
Overcast
Comfortable with temperatures reaching 75°F 24°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds blowing from the NNE at 14 mph 22 km/h. Gusts up to 22 mph 36 km/h.
Monday, September 14, 2026
Mid-Morning
60°F 16°C
Scattered Showers
Mid-Afternoon
75°F 24°C
Overcast
Early-Evening
76°F 25°C
Sunny
Enjoyable around 75°F 24°C, locally heavy downpours at times, with lower humidity and barometric pressure falling. Winds moving from the ESE to the SE at 13 mph 21 km/h. Gusts up to 27 mph 44 km/h.
Tuesday, September 15, 2026
Mid-Morning
80°F 27°C
Overcast
Mid-Afternoon
90°F 32°C
Partly Cloudy
Early-Evening
86°F 30°C
Sunny
Sizzling hot near 90°F 32°C with a heat index reaching 93°F 34°C, overcast in the morning, becoming partly cloudy through the afternoon and evening, with steady humidity and steady pressure. Winds swinging from the SW to the E at 6 mph 9 km/h.
Wednesday, September 16, 2026
Mid-Morning
75°F 24°C
Sunny
Mid-Afternoon
98°F 37°C
Sunny
Early-Evening
90°F 32°C
Cloudy
Very hot with a high of 98°F 37°C, sunny in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and barometric pressure falling. Winds shifting from the ENE to the SW at 8 mph 13 km/h.
Thursday, September 17, 2026
Mid-Morning
77°F 25°C
Light Showers
Mid-Afternoon
81°F 27°C
Cloudy
Early-Evening
73°F 23°C
Scattered Showers
Very warm near 81°F 27°C, though humidity makes it feel like 84°F 29°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds turning from the NW to the SE at 13 mph 21 km/h.
Friday, September 18, 2026
Mid-Morning
68°F 20°C
Overcast
Mid-Afternoon
78°F 26°C
Overcast
Early-Evening
72°F 23°C
Overcast
Comfortable with temperatures reaching 78°F 26°C, overcast throughout the day, with lower humidity and steady pressure. Winds switching from the NE to the NNE at 8 mph 12 km/h.
Saturday, September 19, 2026
Mid-Morning
65°F 18°C
Overcast
Mid-Afternoon
79°F 26°C
Overcast
Early-Evening
71°F 22°C
Sunny
Enjoyable around 79°F 26°C, overcast in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds blowing from the NE at 8 mph 13 km/h.
Sunday, September 20, 2026
Mid-Morning
65°F 18°C
Sunny
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
73°F 23°C
Sunny
Warm temperatures up to 82°F 28°C, sunny in the morning, becoming partly cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds E at 9 mph 14 km/h.
Monday, September 21, 2026
Mid-Morning
67°F 20°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
74°F 24°C
Partly Cloudy
Very warm with a high of 82°F 28°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds out of the ENE at 11 mph 17 km/h.
Tuesday, September 22, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
74°F 23°C
Sunny
Warm and summery near 82°F 28°C, sunny throughout the day, with lower humidity and steady pressure. Winds blowing from the ENE at 12 mph 19 km/h. Gusts up to 22 mph 35 km/h.
Wednesday, September 23, 2026
Mid-Morning
65°F 19°C
Sunny
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
76°F 24°C
Overcast
Balmy with temperatures reaching 82°F 28°C, partly cloudy in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure. Winds switching from the E to the ESE at 7 mph 11 km/h.
Thursday, September 24, 2026
Mid-Morning
65°F 19°C
Overcast
Mid-Afternoon
83°F 28°C
Cloudy
Early-Evening
82°F 28°C
Cloudy
Quite warm around 83°F 28°C, overcast in the morning, cloudy in the afternoon, and sunny this evening, with lower humidity and barometric pressure falling. Winds moving from the SE to the SSE at 10 mph 17 km/h. Gusts up to 21 mph 34 km/h.
Friday, September 25, 2026
Mid-Morning
74°F 24°C
Sunny
Mid-Afternoon
95°F 35°C
Partly Cloudy
Early-Evening
84°F 29°C
Sunny
Hot temperatures near 95°F 35°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with steady humidity and barometric pressure falling. Winds swinging from the SSW to the SE at 9 mph 14 km/h.
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