McHenry, IL Weather Forecast
Local 7-day forecast
Smoke
Track current conditions, temperature changes, wind, and the full daily outlook for McHenry, IL in one place.
Smoke before 1pm, then areas of smoke and scattered showers and thunderstorms. Partly sunny. High near 91, with temperatures falling to around 89 in the afternoon. Heat index values as high as 98. West wind 0 to 5 mph, with gusts as high as 15 mph. Chance of precipitation is 40%.
Local Weather Overview
This forecast page for McHenry, 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: Jul 17, 2026 10:02 AM CDT.
The active forecast window currently covers Jul 17 to Jul 23, 2026 for McHenry, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 10:02 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in McHenry
Today looks like the warmest upcoming period in McHenry at 91 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 58 degrees F.
The strongest winds are forecast for Monday at about 5 to 15 mph SSW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 10:02 AM CDT
- Coverage
- 7 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
Isolated showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. Heat index values as high as 95. West southwest wind around 5 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Sunny. High near 89, with temperatures falling to around 86 in the afternoon. Heat index values as high as 97. Northwest wind around 10 mph, with gusts as high as 20 mph.
Partly cloudy, with a low around 63. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunny, with a high near 83. East northeast wind 0 to 5 mph.
Partly cloudy, with a low around 64.
A slight chance of rain showers between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 87.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. Partly cloudy, with a low around 69.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 83.
Mostly clear, with a low around 60.
Sunny, with a high near 79.
Mostly clear, with a low around 58.
Sunny, with a high near 80.
Partly cloudy, with a low around 60.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Jul 17
|
Smoke
|
91°F |
0 to 5 mph
W
|
|
Tonight
Jul 17
|
Isolated Showers And Thunderstorms then Partly Cloudy
|
72°F |
5 mph
WSW
|
|
Saturday
Jul 18
|
Sunny
|
89°F |
10 mph
NW
|
|
Saturday Night
Jul 18
|
Partly Cloudy
|
63°F |
5 to 10 mph
NNE
|
|
Sunday
Jul 19
|
Sunny
|
83°F |
0 to 5 mph
ENE
|
|
Sunday Night
Jul 19
|
Partly Cloudy
|
64°F |
5 mph
SE
|
|
Monday
Jul 20
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
87°F |
5 to 15 mph
SSW
|
|
Monday Night
Jul 20
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
69°F |
10 to 15 mph
WSW
|
|
Tuesday
Jul 21
|
Chance Showers And Thunderstorms then Mostly Sunny
|
83°F |
10 to 15 mph
WNW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
60°F |
5 to 15 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
79°F |
5 to 10 mph
NNW
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
58°F |
0 to 10 mph
NNW
|
|
Thursday
Jul 23
|
Sunny
|
80°F |
0 to 5 mph
W
|
|
Thursday Night
Jul 23
|
Partly Cloudy
|
60°F |
0 to 5 mph
SW
|
Nearby Forecasts
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