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Gillespie, IL Weather Forecast
Gillespie, IL Weather Forecast Dated: 1158 AM Sun Sep 13 2026
Expect a mild stretch with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Sunday, September 13, 2026
Mid-Morning
71°F 21°C
Overcast
Mid-Afternoon
85°F 29°C
Overcast
Early-Evening
76°F 25°C
Partly Cloudy
Warm and summery near 85°F 29°C, overcast throughout the day, with lower humidity and steady pressure. Winds turning from the NNE to the NE at 11 mph 17 km/h. Gusts up to 20 mph 33 km/h.
Monday, September 14, 2026
Mid-Morning
65°F 18°C
Overcast
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
78°F 26°C
Overcast
Balmy with temperatures reaching 82°F 28°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and barometric pressure falling. Winds switching from the E to the SE at 13 mph 21 km/h. Gusts up to 25 mph 40 km/h.
Tuesday, September 15, 2026
Mid-Morning
78°F 25°C
Overcast
Mid-Afternoon
98°F 37°C
Cloudy
Early-Evening
74°F 24°C
Light Showers
Very hot with a high of 98°F 37°C, feeling closer to 101°F 38°C in the humidity, dry most of the day, with showers developing late, with increasing humidity and steady pressure. Winds moving from the S to the NE at 15 mph 23 km/h. Gusts up to 20 mph 32 km/h.
Wednesday, September 16, 2026
Mid-Morning
73°F 23°C
Overcast
Mid-Afternoon
90°F 32°C
Sunny
Early-Evening
85°F 30°C
Nearby Thunderstorms
Sizzling hot near 90°F 32°C with a heat index reaching 96°F 35°C, periods of heavy thunderstorms, with lower humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
72°F 22°C
Partly Cloudy
Mid-Afternoon
79°F 26°C
Overcast
Early-Evening
75°F 24°C
Overcast
Mild with a high of 79°F 26°C, cloudy in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure. Winds out of the NNW at 9 mph 14 km/h.
Friday, September 18, 2026
Mid-Morning
72°F 22°C
Sunny
Mid-Afternoon
81°F 27°C
Partly Cloudy
Early-Evening
75°F 24°C
Partly Cloudy
Warm and summery near 81°F 27°C, partly cloudy throughout the day, with lower humidity and barometric pressure falling. Winds shifting from the ENE to the E at 9 mph 14 km/h.
Saturday, September 19, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
92°F 34°C
Partly Cloudy
Early-Evening
86°F 30°C
Sunny
Sizzling hot near 92°F 34°C with a heat index reaching 95°F 35°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and barometric pressure falling. Winds turning from the S to the SSW at 10 mph 15 km/h.
Sunday, September 20, 2026
Mid-Morning
71°F 22°C
Light Showers
Mid-Afternoon
74°F 23°C
Scattered Showers
Early-Evening
73°F 23°C
Overcast
Enjoyable around 74°F 23°C, scattered downpours possible, with steady humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
69°F 21°C
Light Fog
Mid-Afternoon
71°F 22°C
Light Showers
Early-Evening
61°F 17°C
Light Showers
Mild temperatures up to 71°F 22°C, dry early, with showers continuing through afternoon and evening, with steady humidity and steady pressure. Winds switching from the SW to the NNW at 10 mph 16 km/h.
Tuesday, September 22, 2026
Mid-Morning
53°F 12°C
Overcast
Mid-Afternoon
54°F 12°C
Scattered Showers
Early-Evening
52°F 11°C
Scattered Showers
Cool and brisk at 54°F 12°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds blowing from the NW at 17 mph 27 km/h. Gusts up to 26 mph 41 km/h.
Wednesday, September 23, 2026
Mid-Morning
51°F 11°C
Overcast
Mid-Afternoon
63°F 17°C
Partly Cloudy
Early-Evening
58°F 15°C
Overcast
Comfortable at 63°F 17°C, overcast in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds swinging from the NW to the NNW at 14 mph 22 km/h. Gusts up to 28 mph 44 km/h.
Thursday, September 24, 2026
Mid-Morning
56°F 13°C
Sunny
Mid-Afternoon
65°F 18°C
Partly Cloudy
Early-Evening
62°F 17°C
Scattered Showers
Cool with a high near 65°F 18°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds shifting from the NNW to the NNE at 10 mph 16 km/h.
Friday, September 25, 2026
Mid-Morning
59°F 15°C
Light Fog
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
64°F 18°C
Sunny
Enjoyable around 72°F 22°C, sunny throughout the day, with lower humidity and steady pressure. Winds turning from the NNE to the ENE at 8 mph 12 km/h.
Saturday, September 26, 2026
Mid-Morning
61°F 16°C
Sunny
Mid-Afternoon
74°F 23°C
Sunny
Early-Evening
67°F 20°C
Sunny
Mild temperatures up to 74°F 23°C, sunny throughout the day, with lower humidity and steady pressure.
Gillespie, IL Weather Radar Map
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