Hourly Weather Forecast - Alton, Ontario, CA

12 AM
19°F
0%
9mph
W
Partly Cloudy
Humidity
77%
Feels like
8°F
Dew Point
13°F
1 AM
19°F
0%
9mph
W
Mostly Clear
Humidity
77%
Feels like
8°F
Dew Point
13°F
2 AM
19°F
0%
10mph
WSW
Mostly Clear
Humidity
77%
Feels like
8°F
Dew Point
13°F
3 AM
18°F
0%
10mph
W
Partly Cloudy
Humidity
79%
Feels like
7°F
Dew Point
13°F
4 AM
18°F
0%
10mph
WSW
Partly Cloudy
Humidity
82%
Feels like
6°F
Dew Point
13°F
5 AM
17°F
0%
10mph
WSW
Partly Cloudy
Humidity
83%
Feels like
5°F
Dew Point
13°F
6 AM
17°F
0%
10mph
WSW
Partly Cloudy
Humidity
83%
Feels like
5°F
Dew Point
13°F
7 AM
18°F
0%
11mph
WSW
Partly Cloudy
Humidity
81%
Feels like
6°F
Dew Point
13°F
7:51 AM
8 AM
20°F
0%
11mph
WSW
Partly Cloudy
Humidity
78%
Feels like
8°F
Dew Point
14°F
9 AM
22°F
0%
12mph
WSW
Mostly Cloudy
Humidity
72%
Feels like
11°F
Dew Point
15°F
10 AM
25°F
0%
12mph
WSW
Cloudy
Humidity
67%
Feels like
14°F
Dew Point
15°F
11 AM
27°F
0%
13mph
WSW
Cloudy
Humidity
63%
Feels like
17°F
Dew Point
17°F
12 PM
29°F
0%
13mph
WSW
Cloudy
Humidity
61%
Feels like
19°F
Dew Point
18°F
1 PM
31°F
30%
13mph
WSW
30% Chance of Snow
Humidity
61%
Feels like
21°F
Dew Point
19°F
2 PM
32°F
30%
12mph
WSW
30% Chance of Snow
Humidity
62%
Feels like
22°F
Dew Point
20°F
3 PM
32°F
30%
11mph
WSW
30% Chance of Snow
Humidity
65%
Feels like
23°F
Dew Point
22°F
4 PM
32°F
30%
10mph
WSW
30% Chance Frozen Mix
Humidity
70%
Feels like
23°F
Dew Point
23°F
4:46 PM
5 PM
31°F
40%
9mph
WSW
40% Chance Frozen Mix
Humidity
74%
Feels like
23°F
Dew Point
24°F
6 PM
31°F
40%
8mph
SW
40% Chance Freezing Rain
Humidity
78%
Feels like
24°F
Dew Point
25°F
7 PM
30°F
40%
6mph
SW
40% Chance Freezing Rain
Humidity
80%
Feels like
24°F
Dew Point
25°F
8 PM
30°F
30%
6mph
SSW
30% Chance Freezing Rain
Humidity
82%
Feels like
24°F
Dew Point
25°F
9 PM
30°F
30%
7mph
SSW
30% Chance Freezing Rain
Humidity
83%
Feels like
23°F
Dew Point
25°F
10 PM
29°F
30%
7mph
SSW
30% Chance Freezing Rain
Humidity
85%
Feels like
22°F
Dew Point
25°F
11 PM
29°F
40%
7mph
S
40% Chance Freezing Rain
Humidity
87%
Feels like
22°F
Dew Point
26°F

Rain And Snow Totals Through Monday

Atmospheric River Impacts Northern California

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

NOAA, NCDC

White Christmas? What Are The Odds

Today's Weather Outlook

Today'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

loading ad...

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide