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Boulder, IL Weather Forecast


Boulder, IL Weather Forecast Dated: 1036 AM Thu Sep 03 2026
Expect a hot stretch with plenty of sunshine and mostly dry weather over the coming period. comfortable humidity and no major pressure swings will dominate.
Thursday, September 3, 2026
Mid-Morning
85°F 30°C
Sunny
Mid-Afternoon
101°F 38°C
Sunny
Early-Evening
91°F 33°C
Sunny
Scorching heat reaching 101°F 38°C, feeling like 108°F 42°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds turning from the SW to the SSE at 5 mph 8 km/h.
Friday, September 4, 2026
Mid-Morning
86°F 30°C
Sunny
Mid-Afternoon
101°F 38°C
Sunny
Early-Evening
95°F 35°C
Sunny
Sweltering heat reaching 101°F 38°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and barometric pressure falling. Winds switching from the W to the SW at 5 mph 9 km/h.
Saturday, September 5, 2026
Mid-Morning
88°F 31°C
Partly Cloudy
Mid-Afternoon
103°F 40°C
Partly Cloudy
Early-Evening
94°F 35°C
Sunny
Dangerously hot temperatures around 103°F 40°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and barometric pressure falling. Winds moving from the W to the ENE at 9 mph 14 km/h.
Sunday, September 6, 2026
Mid-Morning
79°F 26°C
Sunny
Mid-Afternoon
92°F 34°C
Sunny
Early-Evening
82°F 28°C
Cloudy
Hot temperatures near 92°F 34°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds out of the NE at 13 mph 21 km/h. Gusts up to 26 mph 42 km/h.
Monday, September 7, 2026
Mid-Morning
71°F 21°C
Sunny
Mid-Afternoon
90°F 32°C
Sunny
Early-Evening
81°F 27°C
Overcast
Very hot with a high of 90°F 32°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds shifting from the E to the ENE at 10 mph 16 km/h.
Tuesday, September 8, 2026
Mid-Morning
79°F 26°C
Partly Cloudy
Mid-Afternoon
99°F 37°C
Sunny
Early-Evening
93°F 34°C
Sunny
Very hot with temperatures reaching 99°F 37°C, cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the SSE to the S at 8 mph 12 km/h.
Wednesday, September 9, 2026
Mid-Morning
86°F 30°C
Sunny
Mid-Afternoon
106°F 41°C
Sunny
Early-Evening
99°F 37°C
Partly Cloudy
Dangerously hot temperatures around 106°F 41°C, cloudy in the morning, becoming partly cloudy through the afternoon and evening, with lower humidity and barometric pressure falling. Winds switching from the SSW to the S at 11 mph 18 km/h. Gusts up to 22 mph 36 km/h.
Thursday, September 10, 2026
Mid-Morning
92°F 33°C
Sunny
Mid-Afternoon
100°F 38°C
Overcast
Early-Evening
87°F 31°C
Overcast
Dangerously hot with a high of 100°F 38°C, cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds moving from the WSW to the NE at 13 mph 20 km/h. Gusts up to 21 mph 34 km/h.
Friday, September 11, 2026
Mid-Morning
74°F 23°C
Sunny
Mid-Afternoon
94°F 34°C
Partly Cloudy
Early-Evening
85°F 29°C
Sunny
Hot temperatures near 94°F 34°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds swinging from the ENE to the E at 11 mph 18 km/h. Gusts up to 22 mph 36 km/h.
Saturday, September 12, 2026
Mid-Morning
74°F 23°C
Scattered Showers
Mid-Afternoon
97°F 36°C
Cloudy
Early-Evening
93°F 34°C
Sunny
Very hot with a high of 97°F 36°C, periods of heavy rain and gusty conditions, with lower humidity and barometric pressure falling. Winds shifting from the ESE to the SSE at 12 mph 18 km/h. Gusts up to 23 mph 37 km/h.
Sunday, September 13, 2026
Mid-Morning
90°F 32°C
Sunny
Mid-Afternoon
105°F 40°C
Sunny
Early-Evening
99°F 37°C
Sunny
Dangerously hot temperatures around 105°F 40°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds turning from the SW to the SSW at 14 mph 22 km/h. Gusts up to 26 mph 42 km/h.
Monday, September 14, 2026
Mid-Morning
75°F 24°C
Overcast
Mid-Afternoon
78°F 25°C
Light Showers
Early-Evening
76°F 24°C
Light Showers
Comfortable with temperatures reaching 78°F 25°C, dry early, with showers continuing through afternoon and evening, with steady humidity and barometric pressure falling. Winds switching from the SW to the WNW at 15 mph 24 km/h. Gusts up to 32 mph 51 km/h.
Tuesday, September 15, 2026
Mid-Morning
69°F 20°C
Sunny
Mid-Afternoon
83°F 28°C
Sunny
Early-Evening
73°F 23°C
Sunny
Quite warm around 83°F 28°C, sunny throughout the day, with lower humidity and steady pressure. Winds moving from the WNW to the ESE at 9 mph 15 km/h.
Wednesday, September 16, 2026
Mid-Morning
67°F 20°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
73°F 23°C
Sunny
Warm temperatures up to 82°F 28°C, sunny throughout the day, with steady humidity and steady pressure. Winds swinging from the NNW to the NE at 8 mph 12 km/h.
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