Cottage Grove, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Cottage Grove, IL in one place.
Sunny, with a high near 98. West southwest wind 2 to 6 mph.
Local Weather Overview
This forecast page for Cottage Grove, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 15, 2026 5:14 PM CDT.
The active forecast window currently covers Sep 17 to Sep 21, 2026 for Cottage Grove, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 17 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 5:14 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Cottage Grove
Thursday looks like the warmest upcoming period in Cottage Grove at 98 degrees F.
Monday Night is the coolest period ahead with temperatures near 64 degrees F.
The strongest winds are forecast for Saturday at about 2 to 8 mph SSW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 5:14 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KPAH
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 73. East wind around 2 mph.
Sunny, with a high near 96. South southeast wind around 2 mph.
Mostly clear, with a low around 71. South southeast wind around 2 mph.
Sunny, with a high near 96. South southwest wind 2 to 8 mph.
Partly cloudy, with a low around 73. South southwest wind around 6 mph.
A slight chance of rain showers after 1pm. Mostly sunny, with a high near 95. Southwest wind 3 to 8 mph.
A slight chance of rain showers before 1am, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 69. Southwest wind 3 to 7 mph.
A slight chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 87. West southwest wind 3 to 8 mph.
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Mostly cloudy, with a low around 64. North northwest wind 3 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Sep 17
|
Sunny
|
98°F |
2 to 6 mph
WSW
|
|
Thursday Night
Sep 17
|
Mostly Clear
|
73°F |
2 mph
E
|
|
Friday
Sep 18
|
Sunny
|
96°F |
2 mph
SSE
|
|
Friday Night
Sep 18
|
Mostly Clear
|
71°F |
2 mph
SSE
|
|
Saturday
Sep 19
|
Sunny
|
96°F |
2 to 8 mph
SSW
|
|
Saturday Night
Sep 19
|
Partly Cloudy
|
73°F |
6 mph
SSW
|
|
Sunday
Sep 20
|
Mostly Sunny then Slight Chance Rain Showers
|
95°F |
3 to 8 mph
SW
|
|
Sunday Night
Sep 20
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
69°F |
3 to 7 mph
SW
|
|
Monday
Sep 21
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
87°F |
3 to 8 mph
WSW
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
64°F |
3 to 7 mph
NNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Cottage Grove.