McHenry County, IL Weather Forecast
County weather hub
Mostly Cloudy then Slight Chance Rain Showers
Compare major city weather across McHenry County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A slight chance of rain showers between 3pm and 5pm. Mostly cloudy, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
County Weather Overview
This county weather page brings together forecast coverage for McHenry County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 17 of 17 mapped cities in McHenry County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 29 to Sep 3, 2026
- Latest sync
- Aug 28, 2026 5:28 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in McHenry County
Monday looks like the warmest upcoming period in McHenry County at 89 degrees F.
Saturday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Sunday at about 10 to 15 mph SSW.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 28, 2026 5:28 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KMKX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain showers. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
A slight chance of rain showers before 1pm. Partly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7am. Partly sunny, with a high near 89.
Mostly cloudy, with a low around 73.
A slight chance of showers and thunderstorms between 7am and 1pm. Partly sunny, with a high near 89.
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.
A chance of showers and thunderstorms. Mostly sunny, with a high near 89.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70.
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 86.
A chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Mostly Cloudy then Slight Chance Rain Showers
|
78°F |
5 to 10 mph
SSW
|
|
Saturday Night
Aug 29
|
Chance Rain Showers
|
67°F |
10 mph
S
|
|
Sunday
Aug 30
|
Slight Chance Rain Showers
|
86°F |
10 to 15 mph
SSW
|
|
Sunday Night
Aug 30
|
Mostly Cloudy then Slight Chance Showers And Thunderstorms
|
70°F |
10 mph
SSW
|
|
Monday
Aug 31
|
Slight Chance Showers And Thunderstorms then Partly Sunny
|
89°F |
10 mph
SSW
|
|
Monday Night
Aug 31
|
Mostly Cloudy
|
73°F |
5 to 10 mph
SW
|
|
Tuesday
Sep 1
|
Slight Chance Showers And Thunderstorms
|
89°F |
5 mph
SW
|
|
Tuesday Night
Sep 1
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
72°F |
0 to 5 mph
SSW
|
|
Wednesday
Sep 2
|
Chance Showers And Thunderstorms
|
89°F |
0 to 5 mph
SW
|
|
Wednesday Night
Sep 2
|
Slight Chance Showers And Thunderstorms
|
70°F |
0 to 5 mph
SW
|
|
Thursday
Sep 3
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
86°F |
0 to 5 mph
S
|
|
Thursday Night
Sep 3
|
Chance Showers And Thunderstorms
|
69°F |
5 mph
SE
|
Major City Forecasts
Live forecast snapshots for major cities across McHenry County.
Coverage
Forecast coverage currently spans 17 of 17 mapped cities in McHenry County.
Largest mapped city population in this region: 39,642.
