Hourly Weather Forecast - Alton, Ontario, CA

12 AM
28°F
20%
7mph
SSW
Partly Cloudy
Humidity
79%
Feels like
20°F
Dew Point
22°F
1 AM
28°F
30%
7mph
SSW
30% Chance Freezing Rain
Humidity
77%
Feels like
21°F
Dew Point
22°F
2 AM
29°F
30%
6mph
SSW
30% Chance Freezing Rain
Humidity
77%
Feels like
22°F
Dew Point
22°F
3 AM
29°F
40%
6mph
SW
40% Chance Freezing Rain
Humidity
79%
Feels like
22°F
Dew Point
23°F
4 AM
29°F
30%
6mph
SW
30% Chance Frozen Mix
Humidity
81%
Feels like
23°F
Dew Point
24°F
5 AM
29°F
20%
5mph
WSW
Cloudy
Humidity
82%
Feels like
23°F
Dew Point
24°F
6 AM
29°F
10%
5mph
WSW
Cloudy
Humidity
82%
Feels like
24°F
Dew Point
25°F
7 AM
30°F
0%
4mph
WSW
Cloudy
Humidity
83%
Feels like
26°F
Dew Point
25°F
7:53 AM
8 AM
31°F
0%
3mph
SW
Cloudy
Humidity
82%
Feels like
28°F
Dew Point
26°F
9 AM
32°F
0%
2mph
SSW
Mostly Cloudy
Humidity
80%
Feels like
32°F
Dew Point
26°F
10 AM
33°F
0%
2mph
S
Mostly Cloudy
Humidity
77%
Feels like
33°F
Dew Point
27°F
11 AM
34°F
0%
2mph
SSE
Mostly Cloudy
Humidity
75%
Feels like
34°F
Dew Point
27°F
12 PM
35°F
0%
3mph
SE
Mostly Cloudy
Humidity
73%
Feels like
33°F
Dew Point
28°F
1 PM
36°F
0%
4mph
SE
Mostly Cloudy
Humidity
72%
Feels like
33°F
Dew Point
28°F
2 PM
36°F
0%
4mph
SE
Mostly Cloudy
Humidity
72%
Feels like
32°F
Dew Point
28°F
3 PM
35°F
10%
5mph
SE
Mostly Cloudy
Humidity
73%
Feels like
31°F
Dew Point
28°F
4 PM
34°F
10%
6mph
SE
Cloudy
Humidity
76%
Feels like
29°F
Dew Point
28°F
4:47 PM
5 PM
33°F
20%
6mph
SSE
Cloudy
Humidity
79%
Feels like
28°F
Dew Point
28°F
6 PM
32°F
20%
6mph
SSE
Cloudy
Humidity
82%
Feels like
27°F
Dew Point
28°F
7 PM
32°F
20%
6mph
SSE
Cloudy
Humidity
82%
Feels like
27°F
Dew Point
28°F
8 PM
32°F
30%
6mph
SSE
30% Chance of Light Rain
Humidity
82%
Feels like
27°F
Dew Point
28°F
9 PM
33°F
30%
6mph
SSE
30% Chance of Light Rain
Humidity
80%
Feels like
28°F
Dew Point
28°F
10 PM
33°F
40%
6mph
S
40% Chance of Light Rain
Humidity
80%
Feels like
27°F
Dew Point
28°F
11 PM
33°F
40%
6mph
S
40% Chance of Light Rain
Humidity
82%
Feels like
27°F
Dew Point
28°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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