Grundy County, IA Weather Forecast
County weather hub
Rain Showers then Mostly Cloudy
Compare major city weather across Grundy County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Rain showers before 7am. Mostly cloudy, with a high near 63. West northwest wind 17 to 21 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
County Weather Overview
This county weather page brings together forecast coverage for Grundy County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 4 of 4 mapped cities in Grundy County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 19 to May 24, 2026
- Latest sync
- May 17, 2026 10:00 PM CDT
- Forecast office
- DMX
- Source
- NOAA / NWS
Daily Outlook
This Week in Grundy County
Sunday looks like the warmest upcoming period in Grundy County at 84 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 41 degrees F.
The strongest winds are forecast for Tuesday at about 17 to 21 mph WNW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- May 17, 2026 10:00 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- DMX
- Radar station
- KDMX
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 41. North northwest wind 6 to 16 mph, with gusts as high as 22 mph.
Mostly sunny, with a high near 62.
Mostly cloudy, with a low around 42.
Mostly sunny, with a high near 65.
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 45.
A slight chance of rain showers. Partly sunny, with a high near 70.
A slight chance of rain showers before 1am, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 50.
A slight chance of showers and thunderstorms before 7am. Partly sunny, with a high near 77.
A slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 55.
Mostly sunny, with a high near 84.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 19
|
Rain Showers then Mostly Cloudy
|
63°F |
17 to 21 mph
WNW
|
|
Tuesday Night
May 19
|
Mostly Clear
|
41°F |
6 to 16 mph
NNW
|
|
Wednesday
May 20
|
Mostly Sunny
|
62°F |
3 to 8 mph
N
|
|
Wednesday Night
May 20
|
Mostly Cloudy
|
42°F |
5 mph
ENE
|
|
Thursday
May 21
|
Mostly Sunny
|
65°F |
5 to 10 mph
ESE
|
|
Thursday Night
May 21
|
Mostly Cloudy then Slight Chance Rain Showers
|
45°F |
6 to 9 mph
E
|
|
Friday
May 22
|
Slight Chance Rain Showers
|
70°F |
9 mph
ESE
|
|
Friday Night
May 22
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
50°F |
6 to 10 mph
SE
|
|
Saturday
May 23
|
Slight Chance Showers And Thunderstorms then Partly Sunny
|
77°F |
7 to 10 mph
SSE
|
|
Saturday Night
May 23
|
Slight Chance Showers And Thunderstorms
|
55°F |
5 to 9 mph
S
|
|
Sunday
May 24
|
Mostly Sunny
|
84°F |
6 to 10 mph
S
|
Major City Forecasts
Live forecast snapshots for major cities across Grundy County.
Coverage
Forecast coverage currently spans 4 of 4 mapped cities in Grundy County.
Largest mapped city population in this region: 2,670.
