Hourly Weather Forecast - McHenry, IL

12 AM
27°F
10%
6mph
SSW
Cloudy
Humidity
62%
Feels like
20°F
Dew Point
16°F
1 AM
28°F
10%
7mph
SSW
Cloudy
Humidity
61%
Feels like
21°F
Dew Point
17°F
2 AM
29°F
10%
7mph
SSW
Cloudy
Humidity
62%
Feels like
22°F
Dew Point
18°F
3 AM
30°F
30%
7mph
SSW
30% Chance of Flurries
Humidity
63%
Feels like
23°F
Dew Point
19°F
4 AM
30°F
30%
7mph
SSW
30% Chance Frozen Mix
Humidity
63%
Feels like
23°F
Dew Point
19°F
5 AM
31°F
30%
7mph
S
30% Chance Frozen Mix
Humidity
62%
Feels like
24°F
Dew Point
19°F
6 AM
31°F
30%
7mph
S
30% Chance Frozen Mix
Humidity
61%
Feels like
24°F
Dew Point
19°F
7 AM
33°F
30%
8mph
S
30% Chance of Light Rain
Humidity
58%
Feels like
26°F
Dew Point
20°F
7:19 AM
8 AM
34°F
0%
9mph
S
Cloudy
Humidity
56%
Feels like
27°F
Dew Point
20°F
9 AM
36°F
0%
10mph
S
Cloudy
Humidity
54%
Feels like
29°F
Dew Point
21°F
10 AM
38°F
0%
10mph
S
Cloudy
Humidity
52%
Feels like
31°F
Dew Point
22°F
11 AM
39°F
0%
10mph
S
Cloudy
Humidity
50%
Feels like
33°F
Dew Point
22°F
12 PM
40°F
0%
10mph
S
Cloudy
Humidity
50%
Feels like
34°F
Dew Point
23°F
1 PM
40°F
0%
10mph
S
Cloudy
Humidity
49%
Feels like
33°F
Dew Point
22°F
2 PM
39°F
0%
9mph
S
Cloudy
Humidity
49%
Feels like
33°F
Dew Point
22°F
3 PM
39°F
0%
8mph
S
Cloudy
Humidity
53%
Feels like
33°F
Dew Point
23°F
4 PM
38°F
10%
7mph
S
Cloudy
Humidity
60%
Feels like
33°F
Dew Point
25°F
4:24 PM
5 PM
37°F
10%
7mph
S
Cloudy
Humidity
66%
Feels like
32°F
Dew Point
27°F
6 PM
37°F
10%
6mph
S
Cloudy
Humidity
69%
Feels like
32°F
Dew Point
28°F
7 PM
38°F
10%
6mph
SSW
Mostly Cloudy
Humidity
72%
Feels like
33°F
Dew Point
30°F
8 PM
38°F
10%
7mph
SSW
Partly Cloudy
Humidity
73%
Feels like
33°F
Dew Point
30°F
9 PM
38°F
10%
7mph
SSW
Partly Cloudy
Humidity
75%
Feels like
32°F
Dew Point
31°F
10 PM
38°F
10%
8mph
SSW
Partly Cloudy
Humidity
77%
Feels like
32°F
Dew Point
31°F
11 PM
38°F
10%
7mph
SW
Partly Cloudy
Humidity
82%
Feels like
32°F
Dew Point
33°F

Rain And Snow Totals Through Monday

Atmospheric River Takes Aim For Northern California

The plume of abundant moisture impacting the Northwest the last several days will focus more on Northern California later today into Monday bringing heavy rainfall and mountain snow.

NOAA, NCDC

White Christmas? What Are The Odds

Sunday's Weather Outlook

Sunday's Weather Outlook

Cold weather

During Extreme Cold: Watch for Frostbite!

Flu Update Valid For Week Ending December 13, 2025

Weekly Flu Update: Flu Spreading Hard Across U.S.

Watch vs. Warning

Flash Flood Watch and Warning Defined

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