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Boulder IL Weather - Clear - 93°F
Clear
93°F
Updated 10:36 am
Feels Like 94°F
Humidity 53%
Wind N/A N/A mph
Barometer  30.02 in
Dew Point 74°F
Boulder IL Weather - Clear - 34°C
Clear
34°C
Updated 10:36 am
Feels Like 34°C
Humidity 53%
Wind N/A 0 km/h
Barometer  101.6 kPa
Dew Point 23°C
Boulder, IL Weather and Current Conditionsboulder il weather forecast

Boulder, IL Weather Forecast

Boulder Illinois WeatherBoulder, Illinois Weather Weather Forecast
14 day API weather forecast for Boulder, Illinois. Note: The 7-day weather forecast for Boulder, IL is the most reliable and accurate weather forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days ahead.
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
Boulder Weather - 2026-09-03 - Morning - Sunny
85°F 30°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-03 - Afternoon - Sunny
101°F 38°C
Sunny
Early-Evening
Boulder Weather - 2026-09-03 - Evening - Sunny
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
Boulder Weather - 2026-09-04 - Morning - Sunny
86°F 30°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-04 - Afternoon - Sunny
101°F 38°C
Sunny
Early-Evening
Boulder Weather - 2026-09-04 - Evening - Sunny
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
Boulder Weather - 2026-09-05 - Morning - Partly Cloudy
88°F 31°C
Partly Cloudy
Mid-Afternoon
Boulder Weather - 2026-09-05 - Afternoon - Partly Cloudy
103°F 40°C
Partly Cloudy
Early-Evening
Boulder Weather - 2026-09-05 - Evening - Sunny
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
Boulder Weather - 2026-09-06 - Morning - Sunny
79°F 26°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-06 - Afternoon - Sunny
92°F 34°C
Sunny
Early-Evening
Boulder Weather - 2026-09-06 - Evening - Cloudy
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
Boulder Weather - 2026-09-07 - Morning - Sunny
71°F 21°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-07 - Afternoon - Sunny
90°F 32°C
Sunny
Early-Evening
Boulder Weather - 2026-09-07 - Evening - Overcast
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
Boulder Weather - 2026-09-08 - Morning - Partly Cloudy
79°F 26°C
Partly Cloudy
Mid-Afternoon
Boulder Weather - 2026-09-08 - Afternoon - Sunny
99°F 37°C
Sunny
Early-Evening
Boulder Weather - 2026-09-08 - Evening - Sunny
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
Boulder Weather - 2026-09-09 - Morning - Sunny
86°F 30°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-09 - Afternoon - Sunny
106°F 41°C
Sunny
Early-Evening
Boulder Weather - 2026-09-09 - Evening - Partly Cloudy
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
Boulder Weather - 2026-09-10 - Morning - Sunny
92°F 33°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-10 - Afternoon - Overcast
100°F 38°C
Overcast
Early-Evening
Boulder Weather - 2026-09-10 - Evening - Overcast
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
Boulder Weather - 2026-09-11 - Morning - Sunny
74°F 23°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-11 - Afternoon - Partly Cloudy
94°F 34°C
Partly Cloudy
Early-Evening
Boulder Weather - 2026-09-11 - Evening - Sunny
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
Boulder Weather - 2026-09-12 - Morning - Scattered Showers
74°F 23°C
Scattered Showers
Mid-Afternoon
Boulder Weather - 2026-09-12 - Afternoon - Cloudy
97°F 36°C
Cloudy
Early-Evening
Boulder Weather - 2026-09-12 - Evening - Sunny
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
Boulder Weather - 2026-09-13 - Morning - Sunny
90°F 32°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-13 - Afternoon - Sunny
105°F 40°C
Sunny
Early-Evening
Boulder Weather - 2026-09-13 - Evening - Sunny
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
Boulder Weather - 2026-09-14 - Morning - Overcast
75°F 24°C
Overcast
Mid-Afternoon
Boulder Weather - 2026-09-14 - Afternoon - Light Showers
78°F 25°C
Light Showers
Early-Evening
Boulder Weather - 2026-09-14 - Evening - Light Showers
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
Boulder Weather - 2026-09-15 - Morning - Sunny
69°F 20°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-15 - Afternoon - Sunny
83°F 28°C
Sunny
Early-Evening
Boulder Weather - 2026-09-15 - Evening - Sunny
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
Boulder Weather - 2026-09-16 - Morning - Sunny
67°F 20°C
Sunny
Mid-Afternoon
Boulder Weather - 2026-09-16 - Afternoon - Sunny
82°F 28°C
Sunny
Early-Evening
Boulder Weather - 2026-09-16 - Evening - Sunny
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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Weather by the Numbers

Thu, 3rd
Boulder IL Weather - Thursday, Sep 3, 2026 - Sunny
Hi: 101°F 39°C
Lo: 76°F 24°C
Sunrise 06:27 AM
Sunset 07:24 PM
Wind WSW 9 mph14 km/h
Dew Point 71°F22°C
uv Index 8
Barometric Pressure 29.97 in1015 mb
POP 1% *
Humidity 40%
Fri, 4th
Boulder IL Weather - Friday, Sep 4, 2026 - Sunny
Hi: 101°F 38°C
Lo: 79°F 26°C
Sunrise 06:28 AM
Sunset 07:22 PM
Wind W 8 mph13 km/h
Dew Point 64°F18°C
uv Index 8
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 34%
Sat, 5th
Boulder IL Weather - Saturday, Sep 5, 2026 - Partly Cloudy
Hi: 103°F 40°C
Lo: 82°F 28°C
Sunrise 06:29 AM
Sunset 07:20 PM
Wind WNW 10 mph17 km/h
Dew Point 62°F17°C
uv Index 7
Barometric Pressure 29.88 in1012 mb
POP 4% *
Humidity 30%
Sun, 6th
Boulder IL Weather - Sunday, Sep 6, 2026 - Sunny
Hi: 92°F 34°C
Lo: 71°F 22°C
Sunrise 06:30 AM
Sunset 07:19 PM
Wind ENE 12 mph19 km/h
Dew Point 65°F18°C
uv Index 7
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 45%
Mon, 7th
Boulder IL Weather - Monday, Sep 7, 2026 - Sunny
Hi: 90°F 32°C
Lo: 61°F 16°C
Sunrise 06:31 AM
Sunset 07:17 PM
Wind ENE 8 mph12 km/h
Dew Point 52°F11°C
uv Index 7
Barometric Pressure 30.06 in1018 mb
POP 1% *
Humidity 33%
Tue, 8th
Boulder IL Weather - Tuesday, Sep 8, 2026 - Cloudy
Hi: 100°F 38°C
Lo: 68°F 20°C
Sunrise 06:32 AM
Sunset 07:16 PM
Wind S 7 mph11 km/h
Dew Point 63°F17°C
uv Index 7
Barometric Pressure 30.06 in1018 mb
POP 2% *
Humidity 40%
Wed, 9th
Boulder IL Weather - Wednesday, Sep 9, 2026 - Overcast
Hi: 107°F 42°C
Lo: 80°F 27°C
Sunrise 06:33 AM
Sunset 07:14 PM
Wind SW 13 mph21 km/h
Dew Point 59°F15°C
uv Index 8
Barometric Pressure 30 in1016 mb
POP 3% *
Humidity 29%
Thu, 10th
Boulder IL Weather - Thursday, Sep 10, 2026 - Overcast
Hi: 102°F 39°C
Lo: 77°F 25°C
Sunrise 06:34 AM
Sunset 07:13 PM
Wind WNW 17 mph28 km/h
Dew Point 56°F14°C
uv Index 8
Barometric Pressure 29.88 in1012 mb
POP 9% *
Humidity 24%
Fri, 11th
Boulder IL Weather - Friday, Sep 11, 2026 - Cloudy
Hi: 96°F 35°C
Lo: 65°F 18°C
Sunrise 06:34 AM
Sunset 07:11 PM
Wind ENE 9 mph14 km/h
Dew Point 46°F8°C
uv Index 7
Barometric Pressure 30 in1016 mb
POP 4% *
Humidity 26%
Sat, 12th
Boulder IL Weather - Saturday, Sep 12, 2026 - Sunny
Hi: 100°F 38°C
Lo: 65°F 18°C
Sunrise 06:35 AM
Sunset 07:09 PM
Wind SSE 13 mph20 km/h
Dew Point 52°F11°C
uv Index 8
Barometric Pressure 30 in1016 mb
POP 4% *
Humidity 31%
Sun, 13th
Boulder IL Weather - Sunday, Sep 13, 2026 - Sunny
Hi: 105°F 40°C
Lo: 77°F 25°C
Sunrise 06:36 AM
Sunset 07:08 PM
Wind SW 18 mph29 km/h
Dew Point 57°F14°C
uv Index 9
Barometric Pressure 29.85 in1011 mb
POP 1% *
Humidity 24%
Mon, 14th
Boulder IL Weather - Monday, Sep 14, 2026 - Light Rain Shower
Hi: 85°F 30°C
Lo: 72°F 22°C
Sunrise 06:37 AM
Sunset 07:06 PM
Wind SSW 11 mph18 km/h
Dew Point 70°F21°C
uv Index 5
Barometric Pressure 29.83 in1010 mb
POP 55% *
Humidity 81%
Tue, 15th
Boulder IL Weather - Tuesday, Sep 15, 2026 - Sunny
Hi: 83°F 29°C
Lo: 64°F 18°C
Sunrise 06:38 AM
Sunset 07:05 PM
Wind WNW 13 mph21 km/h
Dew Point 46°F8°C
uv Index 7
Barometric Pressure 29.88 in1012 mb
POP 1% *
Humidity 34%
Wed, 16th
Boulder IL Weather - Wednesday, Sep 16, 2026 - Sunny
Hi: 83°F 28°C
Lo: 59°F 15°C
Sunrise 06:39 AM
Sunset 07:03 PM
Wind NW 6 mph9 km/h
Dew Point 43°F6°C
uv Index 7
Barometric Pressure 30.03 in1017 mb
POP 0% *
Humidity 29%
* POP = Probability of Precipitation. Data for 12:00 PM.