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As of 05:34 PDT

Weather in Alton, CA

52°Current weather

Alton, Sunday, 18 October, 05:34

Overcast. Feels like 51°. High 72°, low 50°.

Pressure30.03 inHg
Wind0 mph N
Humidity95%
Visibility1.1 mi
Dew point51°
Mon, 1965° / 44°0Overcast
65 °Overcast

Alton, Monday, 19 October

Overcast. High 65°, low 44°.

Pressure29.94 inHg
Wind2.5 mph NW
Humidity52%
Visibility6.2 mi
Dew point41°
Tue, 2059° / 43°0Overcast
59 °Overcast

Alton, Tuesday, 20 October

Overcast. High 59°, low 43°.

Pressure29.91 inHg
Wind3.4 mph NW
Humidity55%
Visibility6.2 mi
Dew point44°
Wed, 2164° / 44°0Partly cloudy
64 °Partly cloudy

Alton, Wednesday, 21 October

Partly cloudy. High 64°, low 44°.

Pressure29.88 inHg
Wind3.2 mph NW
Humidity66%
Visibility6.2 mi
Dew point50°
Thu, 2258° / 50°0Overcast
58 °Overcast

Alton, Thursday, 22 October

Overcast. High 58°, low 50°.

Pressure30.06 inHg
Wind9.7 mph NW
Humidity74%
Visibility—
Dew point49°
Fri, 2359° / 46°0Mostly clear
59 °Mostly clear

Alton, Friday, 23 October

Mostly clear. High 59°, low 46°.

Pressure30.18 inHg
Wind11.3 mph NW
Humidity66%
Visibility—
Dew point46°
Sat, 2475° / 52°0Clear
75 °Clear

Alton, Saturday, 24 October

Clear. High 75°, low 52°.

Pressure30.09 inHg
Wind6.6 mph NW
Humidity24%
Visibility—
Dew point33°
Sun, 2576° / 55°0Mostly clear
76 °Mostly clear

Alton, Sunday, 25 October

Mostly clear. High 76°, low 55°.

Pressure29.94 inHg
Wind6.2 mph NW
Humidity23%
Visibility—
Dew point33°
Mon, 2675° / 58°0Overcast
75 °Overcast

Alton, Monday, 26 October

Overcast. High 75°, low 58°.

Pressure29.85 inHg
Wind5.1 mph NW
Humidity25%
Visibility—
Dew point34°
Tue, 2774° / 55°0Overcast
74 °Overcast

Alton, Tuesday, 27 October

Overcast. High 74°, low 55°.

Pressure29.94 inHg
Wind5 mph W
Humidity24%
Visibility—
Dew point33°
Wed, 2870° / 50°0Clear
70 °Clear

Alton, Wednesday, 28 October

Clear. High 70°, low 50°.

Pressure30.06 inHg
Wind6.9 mph NW
Humidity27%
Visibility—
Dew point32°
Thu, 2967° / 48°0Clear
67 °Clear

Alton, Thursday, 29 October

Clear. High 67°, low 48°.

Pressure29.97 inHg
Wind6.5 mph NW
Humidity44%
Visibility—
Dew point41°
Fri, 3070° / 48°0Clear
70 °Clear

Alton, Friday, 30 October

Clear. High 70°, low 48°.

Pressure29.88 inHg
Wind7 mph NW
Humidity34%
Visibility—
Dew point37°
Sat, 3168° / 48°0Overcast
68 °Overcast

Alton, Saturday, 31 October

Overcast. High 68°, low 48°.

Pressure29.94 inHg
Wind6.8 mph NW
Humidity32%
Visibility—
Dew point35°
Sun, 0171° / 49°0Overcast
71 °Overcast

Alton, Sunday, 1 November

Overcast. High 71°, low 49°.

Pressure29.97 inHg
Wind5.6 mph W
Humidity33%
Visibility—
Dew point37°
Mon, 0264° / 56°0.01Light rain
64 °Light rain

Alton, Monday, 2 November

Light rain. High 64°, low 56°.

Pressure30.03 inHg
Wind4.3 mph S
Humidity67%
Visibility—
Dew point52°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Alton, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Alton, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.