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As of 23:37 PDT

Weather in Alton, CA

52°Current weather

Alton, Saturday, 17 October, 23:37

Overcast. Feels like 52°. High 77°, low 48°.

Pressure30.12 inHg
Wind0 mph N
Humidity94%
Visibility6.2 mi
Dew point51°
Sun, 1871° / 45°0Overcast
71 °Overcast

Alton, Sunday, 18 October

Overcast. High 71°, low 45°.

Pressure30.06 inHg
Wind4.4 mph W
Humidity93%
Visibility4.3 mi
Dew point52°
Mon, 1959° / 43°0.01Light rain
59 °Light rain

Alton, Monday, 19 October

Light rain. High 59°, low 43°.

Pressure29.94 inHg
Wind2.3 mph N
Humidity53%
Visibility6.2 mi
Dew point41°
Tue, 2058° / 43°0Overcast
58 °Overcast

Alton, Tuesday, 20 October

Overcast. High 58°, low 43°.

Pressure29.91 inHg
Wind2.7 mph W
Humidity62%
Visibility6.2 mi
Dew point43°
Wed, 2165° / 45°0.03Light rain
65 °Light rain

Alton, Wednesday, 21 October

Light rain. High 65°, low 45°.

Pressure29.91 inHg
Wind2.5 mph NW
Humidity69%
Visibility6.2 mi
Dew point53°
Thu, 2257° / 47°0Overcast
57 °Overcast

Alton, Thursday, 22 October

Overcast. High 57°, low 47°.

Pressure30.03 inHg
Wind7.3 mph NW
Humidity79%
Visibility—
Dew point49°
Fri, 2361° / 46°0Clear
61 °Clear

Alton, Friday, 23 October

Clear. High 61°, low 46°.

Pressure30.15 inHg
Wind8 mph NW
Humidity61%
Visibility—
Dew point46°
Sat, 2472° / 48°0Overcast
72 °Overcast

Alton, Saturday, 24 October

Overcast. High 72°, low 48°.

Pressure30.06 inHg
Wind5.6 mph NW
Humidity30%
Visibility—
Dew point36°
Sun, 2571° / 53°0Overcast
71 °Overcast

Alton, Sunday, 25 October

Overcast. High 71°, low 53°.

Pressure29.97 inHg
Wind6.2 mph NW
Humidity30%
Visibility—
Dew point36°
Mon, 2670° / 51°0Overcast
70 °Overcast

Alton, Monday, 26 October

Overcast. High 70°, low 51°.

Pressure29.80 inHg
Wind7 mph NW
Humidity30%
Visibility—
Dew point35°
Tue, 2762° / 48°0Overcast
62 °Overcast

Alton, Tuesday, 27 October

Overcast. High 62°, low 48°.

Pressure29.85 inHg
Wind10.9 mph N
Humidity55%
Visibility—
Dew point44°
Wed, 2860° / 48°0Partly cloudy
60 °Partly cloudy

Alton, Wednesday, 28 October

Partly cloudy. High 60°, low 48°.

Pressure30.12 inHg
Wind9.1 mph NW
Humidity53%
Visibility—
Dew point42°
Thu, 2963° / 46°0.01Light rain
63 °Light rain

Alton, Thursday, 29 October

Light rain. High 63°, low 46°.

Pressure30.12 inHg
Wind7.2 mph NW
Humidity57%
Visibility—
Dew point45°
Fri, 3057° / 51°0.35Rain
57 °Rain

Alton, Friday, 30 October

Rain. High 57°, low 51°.

Pressure29.97 inHg
Wind9.7 mph SE
Humidity71%
Visibility—
Dew point44°
Sat, 3159° / 51°0.15Light rain
59 °Light rain

Alton, Saturday, 31 October

Light rain. High 59°, low 51°.

Pressure29.88 inHg
Wind10.5 mph SE
Humidity77%
Visibility—
Dew point51°
Sun, 0158° / 48°0.5Rain
58 °Rain

Alton, Sunday, 1 November

Rain. High 58°, low 48°.

Pressure29.97 inHg
Wind10.6 mph S
Humidity68%
Visibility—
Dew point46°

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.