Hourly Weather Forecast - Alton, Ontario, CA

12 AM
31°F
10%
15mph
WNW
Mostly Cloudy
Humidity
78%
Feels like
20°F
Dew Point
25°F
1 AM
30°F
10%
15mph
WNW
Mostly Cloudy
Humidity
77%
Feels like
20°F
Dew Point
24°F
2 AM
30°F
10%
14mph
NW
Mostly Cloudy
Humidity
76%
Feels like
19°F
Dew Point
23°F
3 AM
29°F
10%
13mph
NW
Mostly Cloudy
Humidity
76%
Feels like
18°F
Dew Point
22°F
4 AM
28°F
10%
12mph
NW
Mostly Cloudy
Humidity
77%
Feels like
17°F
Dew Point
22°F
5 AM
27°F
10%
11mph
NW
Partly Cloudy
Humidity
77%
Feels like
17°F
Dew Point
21°F
6 AM
26°F
0%
10mph
NW
Partly Cloudy
Humidity
76%
Feels like
17°F
Dew Point
20°F
7 AM
25°F
0%
9mph
NW
Partly Cloudy
Humidity
78%
Feels like
16°F
Dew Point
19°F
7:52 AM
8 AM
24°F
0%
8mph
NW
Partly Cloudy
Humidity
79%
Feels like
16°F
Dew Point
19°F
9 AM
24°F
0%
6mph
NW
Partly Cloudy
Humidity
78%
Feels like
17°F
Dew Point
19°F
10 AM
25°F
0%
5mph
NW
Mostly Cloudy
Humidity
75%
Feels like
18°F
Dew Point
18°F
11 AM
26°F
0%
4mph
WNW
Mostly Cloudy
Humidity
72%
Feels like
21°F
Dew Point
18°F
12 PM
27°F
0%
4mph
W
Mostly Cloudy
Humidity
69%
Feels like
22°F
Dew Point
18°F
1 PM
28°F
0%
5mph
WSW
Mostly Cloudy
Humidity
67%
Feels like
22°F
Dew Point
18°F
2 PM
28°F
0%
5mph
SW
Mostly Cloudy
Humidity
67%
Feels like
22°F
Dew Point
18°F
3 PM
28°F
0%
5mph
SSW
Mostly Cloudy
Humidity
69%
Feels like
21°F
Dew Point
19°F
4 PM
27°F
0%
6mph
SSW
Mostly Cloudy
Humidity
72%
Feels like
21°F
Dew Point
19°F
4:47 PM
5 PM
27°F
0%
6mph
S
Mostly Cloudy
Humidity
74%
Feels like
20°F
Dew Point
20°F
6 PM
27°F
0%
6mph
S
Mostly Cloudy
Humidity
77%
Feels like
20°F
Dew Point
20°F
7 PM
26°F
0%
6mph
S
Mostly Cloudy
Humidity
79%
Feels like
19°F
Dew Point
21°F
8 PM
26°F
10%
7mph
S
Mostly Cloudy
Humidity
81%
Feels like
19°F
Dew Point
21°F
9 PM
26°F
10%
7mph
S
Mostly Cloudy
Humidity
81%
Feels like
18°F
Dew Point
21°F
10 PM
27°F
10%
8mph
S
Mostly Cloudy
Humidity
81%
Feels like
18°F
Dew Point
21°F
11 PM
27°F
10%
8mph
SSW
Partly Cloudy
Humidity
80%
Feels like
19°F
Dew Point
22°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

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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

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