Boulder, IL Weather Forecast

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Boulder, IL Weather Forecast

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Boulder IL weather  - Sunny - 100°F
Sunny
100°F
Updated 2:45 pm
Feels Like 105°F
Humidity 37%
Wind N/A N/A mph
Barometer  29.97 in
Dew Point 70°F
Boulder IL weather  - Sunny - 38°C
Sunny
38°C
Updated 2:45 pm
Feels Like 41°C
Humidity 37%
Wind N/A 0 km/h
Barometer  101.4 kPa
Dew Point 21°C

Boulder Weather Forecast

THIS AFTERNOON TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY TUESDAY WEDNESDAY WEDNESDAY NIGHT THURSDAY
Boulder, IL Weather - This Afternoon Sunny Boulder, IL Weather - Tonight Mostly Clear Boulder, IL Weather - Saturday Thunderstorms Boulder, IL Weather - Saturday Night Mostly Clear Boulder, IL Weather - Sunday Sunny Boulder, IL Weather - Sunday Night Mostly Clear Boulder, IL Weather - Monday Mostly Clear Boulder, IL Weather - Tuesday Mostly Clear Boulder, IL Weather - Wednesday Mostly Clear Boulder, IL Weather - Wednesday Night Chance Of Showers Boulder, IL Weather - Thursday Chance Of Showers
Sunny Mostly Clear Thunderstorms Mostly Clear Sunny Mostly Clear Mostly Clear Mostly Clear Mostly Clear Chance of Showers Chance of Showers
Hi: 99°FHi: 37°C
Lo: 75°FLo: 24°C Hi: 100°FHi: 38°C
Lo: 71°FLo: 22°C Hi: 91°FHi: 33°C
Hi: 91°FHi: 33°C
Lo: 65°FLo: 18°C
Hi: 91°FHi: 33°C
Lo: 65°FLo: 18°C
Hi: 99°FHi: 37°C
Lo: 71°FLo: 22°C
Hi: 99°FHi: 37°C
Lo: 71°FLo: 22°C
Lo: 75°FLo: 24°C Hi: 91°FHi: 33°C
POP: 20% POP: 20% POP: 20%
POP = Probability of Precipitation.
Weather Outlook Updated: 142 PM CDT Fri Sep 04 2026 Boulder, IL Weather - WeatherWorld.com

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Issued: 1221 PM CDT Fri Sep 4 2026

Key Messages

  • A late summer heatwave will continue through Saturday before temperatures cool slightly Sunday into Labor Day.
  • Another period of heat and near-record breaking temperatures is forecast Tuesday into Wednesday, but it is uncertain how long the heat persists thereafter.

Aviation

/18Z TAFS THROUGH 00Z SUNDAY/... Issued at 1219 PM CDT Fri Sep 4 2026

Dry/VFR conditions with diurnal cumulus dissipating this evening along with winds becoming light/variable are expected.


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