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Keystone Park, IL Weather Forecast

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Keystone Park, IL Weather Forecast

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Keystone Park IL weather - Mostly Cloudy - 87°F
Mostly Cloudy
87°F
Updated 5:41 pm
Feels Like 89°F
Humidity 41%
Wind W 9 mph
Barometer  29.85 in
Dew Point 61°F
Keystone Park IL weather - Mostly Cloudy - 31°C
Mostly Cloudy
31°C
Updated 5:41 pm
Feels Like 32°C
Humidity 41%
Wind W 14 km/h
Barometer  101.1 kPa
Dew Point 16°C
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Keystone Park Weather Forecast

LATE THIS AFTERNOON TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT
Keystone Park, IL Weather - Late This Afternoon Mostly Cloudy Keystone Park, IL Weather - Tonight Partly Cloudy Keystone Park, IL Weather - Sunday Chance Of Showers Keystone Park, IL Weather - Sunday Night Clearing Keystone Park, IL Weather - Monday Partly Cloudy Keystone Park, IL Weather - Monday Night Chance Of T-Storm Keystone Park, IL Weather - Tuesday Chance Of T-Storm Keystone Park, IL Weather - Tuesday Night Chance Of T-Storm Keystone Park, IL Weather - Wednesday Showers Keystone Park, IL Weather - Wednesday Night Showers Likely Keystone Park, IL Weather - Thursday Showers Keystone Park, IL Weather - Thursday Night Chance Of Showers
Mostly Cloudy Partly Cloudy Chance of Showers Clearing Partly Cloudy Chance of T-Storm Chance of T-Storm Chance of T-Storm Showers Showers Likely Showers Chance of Showers
Hi: 85°FHi: 29°C
 Lo: 65°FLo: 18°C Hi: 75°FHi: 24°C
 Lo: 55°FLo: 13°C Hi: 75°FHi: 24°C
 Lo: 65°FLo: 18°C Hi: 85°FHi: 29°C
 Lo: 69°FLo: 21°C Hi: 75°FHi: 24°C
 Lo: 70°FLo: 21°C Hi: 79°FHi: 26°C
 Lo: 65°FLo: 18°C
POP: 40% POP: 30% POP: 50% POP: 80% POP: 80% POP: 70% POP: 70% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 321 PM CDT Sat Sep 12 2026 Keystone Park, IL Weather - WeatherWorld.com

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Keystone Park Forecast Discussion

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Issued: 130 PM CDT Sat Sep 12 2026

Key Messages

  • Turning cooler tomorrow with a chance for afternoon showers.
  • Waves of heavy rain producing thunderstorms possible in the general region early to mid next week.

Discussion

... Issued at 130 PM CDT Sat Sep 12 2026

A cold front is pushing into northwest Illinois early this afternoon and will continue to shift across the forecast area through this evening. While dewpoints have been slowly climbing into the upper 60s/near 70 degrees ahead of this boundary, forecast soundings remain generally...