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Summum, IL Weather Forecast
Summum, IL Weather Forecast Dated: 604 PM Sat Sep 12 2026
Expect a mild stretch with more clouds than sun and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Saturday, September 12, 2026
Mid-Morning
71°F 22°C
Sunny
Mid-Afternoon
86°F 30°C
Overcast
Early-Evening
79°F 27°C
Overcast
Warm and summery around 86°F 30°C (feels like 91°F 33°C), sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the WSW to the N at 10 mph 16 km/h. Gusts up to 20 mph 32 km/h.
Sunday, September 13, 2026
Mid-Morning
69°F 21°C
Overcast
Mid-Afternoon
75°F 24°C
Overcast
Early-Evening
73°F 23°C
Scattered Showers
Comfortable with temperatures reaching 75°F 24°C, scattered downpours possible, with lower humidity and steady pressure. Winds switching from the NE to the ENE at 12 mph 19 km/h.
Monday, September 14, 2026
Mid-Morning
61°F 16°C
Light Showers
Mid-Afternoon
71°F 22°C
Overcast
Early-Evening
75°F 24°C
Cloudy
Enjoyable around 71°F 22°C, morning showers, giving way to clearing skies, with lower humidity and barometric pressure falling. Winds SE at 13 mph 21 km/h. Gusts up to 29 mph 47 km/h.
Tuesday, September 15, 2026
Mid-Morning
75°F 24°C
Light Showers
Mid-Afternoon
85°F 29°C
Overcast
Early-Evening
79°F 26°C
Overcast
Warm and summery around 85°F 29°C (feels like 88°F 31°C), early showers breaking for a drier afternoon, with steady humidity and steady pressure. Winds swinging from the SW to the ENE at 6 mph 10 km/h.
Wednesday, September 16, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
75°F 24°C
Light Showers
Early-Evening
72°F 22°C
Scattered Showers
Mild with a high of 75°F 24°C, scattered downpours possible, with steady humidity and steady pressure. Winds shifting from the ENE to the NE at 11 mph 17 km/h.
Thursday, September 17, 2026
Mid-Morning
67°F 20°C
Heavy Rain Showers
Mid-Afternoon
72°F 22°C
Light Showers
Early-Evening
67°F 19°C
Scattered Showers
Pleasant near 72°F 22°C, locally heavy downpours at times, with steady humidity and steady pressure.
Friday, September 18, 2026
Mid-Morning
65°F 18°C
Fog
Mid-Afternoon
75°F 24°C
Scattered Showers
Early-Evening
73°F 23°C
Overcast
Comfortable with temperatures reaching 75°F 24°C, periods of heavy rain and gusty conditions, with steady humidity and barometric pressure falling. Winds ENE at 9 mph 14 km/h.
Saturday, September 19, 2026
Mid-Morning
71°F 21°C
Fog
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
72°F 23°C
Overcast
Quite warm reaching 82°F 28°C, feeling like 85°F 29°C during peak afternoon, overcast throughout the day, with steady humidity and steady pressure. Winds switching from the SE to the NNE at 12 mph 19 km/h. Gusts up to 20 mph 33 km/h.
Sunday, September 20, 2026
Mid-Morning
62°F 16°C
Overcast
Mid-Afternoon
64°F 18°C
Overcast
Early-Evening
64°F 18°C
Overcast
Refreshing around 64°F 18°C, overcast throughout the day, with lower humidity and steady pressure. Winds moving from the NE to the ENE at 16 mph 26 km/h. Gusts up to 29 mph 47 km/h.
Monday, September 21, 2026
Mid-Morning
57°F 14°C
Light Showers
Mid-Afternoon
58°F 14°C
Light Showers
Early-Evening
59°F 15°C
Light Showers
Mildly cool near 58°F 14°C, rounds of showers expected off and on all day, with steady humidity and steady pressure. Winds swinging from the ENE to the NE at 13 mph 20 km/h. Gusts up to 27 mph 43 km/h.
Tuesday, September 22, 2026
Mid-Morning
57°F 14°C
Light Showers
Mid-Afternoon
59°F 15°C
Scattered Showers
Early-Evening
60°F 16°C
Light Showers
Comfortable at 59°F 15°C, scattered downpours possible, with steady humidity and steady pressure. Winds shifting from the NNE to the N at 11 mph 17 km/h. Gusts up to 26 mph 41 km/h.
Wednesday, September 23, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
68°F 20°C
Sunny
Comfortable with temperatures reaching 79°F 26°C, sunny throughout the day, with lower humidity and barometric pressure rising. Winds turning from the E to the NNW at 10 mph 16 km/h. Gusts up to 21 mph 34 km/h.
Thursday, September 24, 2026
Mid-Morning
55°F 13°C
Sunny
Mid-Afternoon
70°F 21°C
Sunny
Early-Evening
64°F 18°C
Sunny
Enjoyable around 70°F 21°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and barometric pressure falling. Winds switching from the NNE to the E at 8 mph 13 km/h.
Friday, September 25, 2026
Mid-Morning
69°F 21°C
Cloudy
Mid-Afternoon
98°F 37°C
Sunny
Early-Evening
88°F 31°C
Partly Cloudy
Hot temperatures near 98°F 37°C, partly cloudy throughout the day, with steady humidity and barometric pressure falling. Winds moving from the S to the E at 12 mph 19 km/h. Gusts up to 20 mph 33 km/h.
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