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As of 16:45 PDT

Weather in Alton, CA

57°Current weather

Alton, Saturday, 17 October, 16:45

Overcast. Feels like 56°. High 73°, low 48°.

Pressure30.12 inHg
Wind11.5 mph NW
Humidity89%
Visibility4.9 mi
Dew point53°
Sun, 1871° / 46°0Overcast
71 °Overcast

Alton, Sunday, 18 October

Overcast. High 71°, low 46°.

Pressure30.06 inHg
Wind4.2 mph W
Humidity92%
Visibility5.2 mi
Dew point52°
Mon, 1959° / 45°0Overcast
59 °Overcast

Alton, Monday, 19 October

Overcast. High 59°, low 45°.

Pressure29.97 inHg
Wind2.7 mph NW
Humidity55%
Visibility6.2 mi
Dew point42°
Tue, 2059° / 44°0Overcast
59 °Overcast

Alton, Tuesday, 20 October

Overcast. High 59°, low 44°.

Pressure29.88 inHg
Wind4.1 mph W
Humidity61%
Visibility6.2 mi
Dew point45°
Wed, 2165° / 46°0.16Rain
65 °Rain

Alton, Wednesday, 21 October

Rain. High 65°, low 46°.

Pressure29.94 inHg
Wind0.8 mph S
Humidity82%
Visibility6.2 mi
Dew point52°
Thu, 2258° / 45°0Overcast
58 °Overcast

Alton, Thursday, 22 October

Overcast. High 58°, low 45°.

Pressure30.06 inHg
Wind8.4 mph NW
Humidity79%
Visibility—
Dew point49°
Fri, 2365° / 47°0Clear
65 °Clear

Alton, Friday, 23 October

Clear. High 65°, low 47°.

Pressure30.06 inHg
Wind7.6 mph NW
Humidity53%
Visibility—
Dew point45°
Sat, 2465° / 46°0Overcast
65 °Overcast

Alton, Saturday, 24 October

Overcast. High 65°, low 46°.

Pressure30.00 inHg
Wind6 mph NW
Humidity53%
Visibility—
Dew point46°
Sun, 2566° / 50°0Overcast
66 °Overcast

Alton, Sunday, 25 October

Overcast. High 66°, low 50°.

Pressure29.91 inHg
Wind6.3 mph NW
Humidity49%
Visibility—
Dew point44°
Mon, 2672° / 49°0Clear
72 °Clear

Alton, Monday, 26 October

Clear. High 72°, low 49°.

Pressure29.74 inHg
Wind7 mph NW
Humidity37%
Visibility—
Dew point41°
Tue, 2766° / 50°0Overcast
66 °Overcast

Alton, Tuesday, 27 October

Overcast. High 66°, low 50°.

Pressure29.80 inHg
Wind6.4 mph NW
Humidity44%
Visibility—
Dew point42°
Wed, 2857° / 47°0.61Rain
57 °Rain

Alton, Wednesday, 28 October

Rain. High 57°, low 47°.

Pressure29.97 inHg
Wind10.9 mph S
Humidity82%
Visibility—
Dew point52°
Thu, 2959° / 46°0.02Light rain
59 °Light rain

Alton, Thursday, 29 October

Light rain. High 59°, low 46°.

Pressure30.03 inHg
Wind7.5 mph SE
Humidity58%
Visibility—
Dew point43°
Fri, 3056° / 52°0.78Rain
56 °Rain

Alton, Friday, 30 October

Rain. High 56°, low 52°.

Pressure29.83 inHg
Wind9.5 mph SE
Humidity94%
Visibility—
Dew point53°
Sat, 3154° / 46°0.73Rain
54 °Rain

Alton, Saturday, 31 October

Rain. High 54°, low 46°.

Pressure29.94 inHg
Wind9.7 mph W
Humidity85%
Visibility—
Dew point48°
Sun, 0162° / 46°0.01Light rain
62 °Light rain

Alton, Sunday, 1 November

Light rain. High 62°, low 46°.

Pressure30.09 inHg
Wind9.1 mph SE
Humidity44%
Visibility—
Dew point37°

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.