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Cottagegrove, IL Weather Forecast

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Cottagegrove, IL Weather Forecast

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Cottagegrove IL weather - Partly Cloudy - 59°F
Partly Cloudy
59°F
Updated 6:24 am
Feels Like 52°F
Humidity 83%
Wind N 0 mph
Barometer  30.06 in
Dew Point 54°F
Cottagegrove IL weather - Partly Cloudy - 15°C
Partly Cloudy
15°C
Updated 6:24 am
Feels Like 11°C
Humidity 83%
Wind N 0 km/h
Barometer  101.8 kPa
Dew Point 12°C
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Cottagegrove Weather Forecast

OVERNIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY
Cottagegrove, IL Weather - Overnight Mostly Cloudy Cottagegrove, IL Weather - Sunday Partly Sunny Cottagegrove, IL Weather - Sunday Night Clearing Cottagegrove, IL Weather - Monday Sunny Cottagegrove, IL Weather - Monday Night Clear Cottagegrove, IL Weather - Tuesday Sunny Cottagegrove, IL Weather - Tuesday Night Partly Cloudy Cottagegrove, IL Weather - Wednesday Mostly Cloudy Cottagegrove, IL Weather - Wednesday Night Mostly Cloudy Cottagegrove, IL Weather - Thursday Chance Of Showers Cottagegrove, IL Weather - Thursday Night Chance Of Showers Cottagegrove, IL Weather - Friday Chance Of Showers
Mostly Cloudy Partly Sunny Clearing Sunny Clear Sunny Partly Cloudy Mostly Cloudy Mostly Cloudy Chance of Showers Chance of Showers Chance of Showers
Lo: 55°FLo: 13°C Hi: 75°FHi: 24°C
 Lo: 51°FLo: 11°C Hi: 75°FHi: 24°C
 Lo: 51°FLo: 11°C Hi: 81°FHi: 27°C
 Lo: 61°FLo: 16°C Hi: 85°FHi: 29°C
Lo: 69°FLo: 21°C		 Hi: 85°FHi: 29°C
Lo: 69°FLo: 21°C		 Hi: 85°FHi: 29°C
 Lo: 65°FLo: 18°C Hi: 79°FHi: 26°C
Lo: 61°FLo: 16°C
POP: 40% POP: 50% POP: 50%
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Sun Sep 27 2026 Cottagegrove, IL Weather - WeatherWorld.com

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Issued: 237 AM CDT Sun Sep 27 2026

Key Messages

  • Pleasant weather will continue through Monday with highs in the 70s and lows in the 50s. A few sprinkles will be possible over the western half of the Quad State today.
  • Temperatures will soar above normal Wednesday and Thursday, when highs will be in the middle to upper 80s over much of the region and lows will be in the 60s.
  • Chances of showers return to the forecast Wednesday night and Thursday, and then more widespread showers are expected Thursday night through at least Friday. A ...