Grinnell, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grinnell, IL in one place.
Sunny. High near 97, with temperatures falling to around 95 in the afternoon. South southwest wind 1 to 6 mph.
Local Weather Overview
This forecast page for Grinnell, 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 5:18 PM CDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for Grinnell, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 5:18 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Grinnell
Wednesday looks like the warmest upcoming period in Grinnell at 97 degrees F.
Monday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Wednesday at about 1 to 6 mph SSW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 5:18 PM CDT
- Coverage
- 6 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. South wind around 1 mph.
Sunny, with a high near 97. West southwest wind around 3 mph.
Mostly clear, with a low around 72. Northwest wind around 1 mph.
Sunny, with a high near 96. South southwest wind around 1 mph.
Mostly clear, with a low around 72. Wind around 0 mph.
Sunny, with a high near 97. South southwest wind 1 to 6 mph.
Mostly clear, with a low around 72. South southwest wind around 2 mph.
Sunny, with a high near 95. Southwest wind 2 to 6 mph.
Mostly clear, with a low around 69. South southwest wind around 3 mph.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. West wind around 6 mph.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65. Northwest wind around 5 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Sunny
|
97°F |
1 to 6 mph
SSW
|
|
Wednesday Night
Sep 16
|
Mostly Clear
|
73°F |
1 mph
S
|
|
Thursday
Sep 17
|
Sunny
|
97°F |
3 mph
WSW
|
|
Thursday Night
Sep 17
|
Mostly Clear
|
72°F |
1 mph
NW
|
|
Friday
Sep 18
|
Sunny
|
96°F |
1 mph
SSW
|
|
Friday Night
Sep 18
|
Mostly Clear
|
72°F |
0 mph
|
|
Saturday
Sep 19
|
Sunny
|
97°F |
1 to 6 mph
SSW
|
|
Saturday Night
Sep 19
|
Mostly Clear
|
72°F |
2 mph
SSW
|
|
Sunday
Sep 20
|
Sunny
|
95°F |
2 to 6 mph
SW
|
|
Sunday Night
Sep 20
|
Mostly Clear
|
69°F |
3 mph
SSW
|
|
Monday
Sep 21
|
Mostly Sunny then Chance Showers And Thunderstorms
|
88°F |
6 mph
W
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms
|
65°F |
5 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grinnell.