Lake Jaycee, IL Weather Forecast

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Lake Jaycee, IL Weather Forecast

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Lake Jaycee IL weather  - Clear - 85°F
Clear
85°F
Updated 1:26 pm
Feels Like 94°F
Humidity 49%
Wind VRB 3 mph
Barometer  30.07 in
Dew Point 64°F
Lake Jaycee IL weather  - Clear - 29°C
Clear
29°C
Updated 1:26 pm
Feels Like 34°C
Humidity 49%
Wind VRB 5 km/h
Barometer  101.8 kPa
Dew Point 18°C

Lake Jaycee Weather Forecast

THIS AFTERNOON TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY WEDNESDAY WEDNESDAY NIGHT THURSDAY
Lake Jaycee, IL Weather - This Afternoon Sunny Lake Jaycee, IL Weather - Tonight Patchy Fog Lake Jaycee, IL Weather - Saturday Sunny Lake Jaycee, IL Weather - Saturday Night Patchy Fog Lake Jaycee, IL Weather - Sunday Patchy Fog Lake Jaycee, IL Weather - Sunday Night Partly Cloudy Lake Jaycee, IL Weather - Monday Partly Cloudy Lake Jaycee, IL Weather - Monday Night Partly Cloudy Lake Jaycee, IL Weather - Tuesday Partly Cloudy Lake Jaycee, IL Weather - Wednesday Partly Cloudy Lake Jaycee, IL Weather - Wednesday Night Mostly Clear Lake Jaycee, IL Weather - Thursday Mostly Clear
Sunny Patchy Fog Sunny Patchy Fog Patchy Fog Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Mostly Clear Mostly Clear
Hi: 85°FHi: 29°C
Lo: 69°FLo: 21°C Hi: 89°FHi: 32°C
Lo: 61°FLo: 16°C Hi: 81°FHi: 27°C
Hi: 81°FHi: 27°C
Lo: 60°FLo: 16°C
Hi: 81°FHi: 27°C
Lo: 60°FLo: 16°C
Lo: 65°FLo: 18°C Hi: 89°FHi: 32°C
Lo: 69°FLo: 21°C
Hi: 89°FHi: 32°C
Lo: 69°FLo: 21°C
Hi: 89°FHi: 32°C
Lo: 65°FLo: 18°C
Hi: 89°FHi: 32°C
Lo: 65°FLo: 18°C
POP = Probability of Precipitation.
Weather Outlook Updated: 1233 PM CDT Fri Aug 21 2026 Lake Jaycee, IL Weather - WeatherWorld.com

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Lake Jaycee Forecast Discussion

Issued: 1227 PM CDT Fri Aug 21 2026

Key Messages

  • Daily thunderstorm chances of 15 to 30% are forecast during the afternoon and evening hours Monday through Wednesday.
  • Temperature and humidity levels will be near typical late August levels through the next week.

Discussion

... Issued at 1226 PM CDT Fri Aug 21 2026

Broad troughing is centered to our east and northeast putting the area in a moderate northwesterly flow aloft. A jet max works in on the backside of this trough through Sunday morning keeping it roughly in place. There is a s...