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As of 00:07 PDT

Weather in Alton, CA

44°Current weather

Alton, Monday, 12 October, 00:07

Clear. Feels like 39°. High 63°, low 42°.

Pressure29.83 inHg
Wind6.9 mph SE
Humidity94%
Visibility6.2 mi
Dew point42°
Tue, 1363° / 45°0Mostly clear
63 °Mostly clear

Alton, Tuesday, 13 October

Mostly clear. High 63°, low 45°.

Pressure30.12 inHg
Wind3.4 mph NW
Humidity59%
Visibility6.2 mi
Dew point47°
Wed, 1463° / 41°0Mostly clear
63 °Mostly clear

Alton, Wednesday, 14 October

Mostly clear. High 63°, low 41°.

Pressure30.15 inHg
Wind5.6 mph NW
Humidity68%
Visibility6.2 mi
Dew point50°
Thu, 1575° / 49°0Clear
75 °Clear

Alton, Thursday, 15 October

Clear. High 75°, low 49°.

Pressure30.09 inHg
Wind2.1 mph NW
Humidity48%
Visibility6.2 mi
Dew point53°
Fri, 1661° / 50°0Overcast
61 °Overcast

Alton, Friday, 16 October

Overcast. High 61°, low 50°.

Pressure30.09 inHg
Wind5.9 mph NW
Humidity78%
Visibility—
Dew point53°
Sat, 1762° / 52°0Overcast
62 °Overcast

Alton, Saturday, 17 October

Overcast. High 62°, low 52°.

Pressure30.09 inHg
Wind8.8 mph NW
Humidity76%
Visibility—
Dew point53°
Sun, 1867° / 49°0Mostly clear
67 °Mostly clear

Alton, Sunday, 18 October

Mostly clear. High 67°, low 49°.

Pressure30.06 inHg
Wind8 mph NW
Humidity59%
Visibility—
Dew point50°
Mon, 1961° / 46°0.07Light rain
61 °Light rain

Alton, Monday, 19 October

Light rain. High 61°, low 46°.

Pressure30.15 inHg
Wind8.8 mph NW
Humidity65%
Visibility—
Dew point48°
Tue, 2060° / 43°0Clear
60 °Clear

Alton, Tuesday, 20 October

Clear. High 60°, low 43°.

Pressure30.21 inHg
Wind11.2 mph NW
Humidity54%
Visibility—
Dew point41°
Wed, 2167° / 45°0Clear
67 °Clear

Alton, Wednesday, 21 October

Clear. High 67°, low 45°.

Pressure30.15 inHg
Wind8.3 mph N
Humidity39%
Visibility—
Dew point38°
Thu, 2272° / 51°0Clear
72 °Clear

Alton, Thursday, 22 October

Clear. High 72°, low 51°.

Pressure30.03 inHg
Wind8.1 mph NW
Humidity41%
Visibility—
Dew point44°
Fri, 2360° / 51°0Overcast
60 °Overcast

Alton, Friday, 23 October

Overcast. High 60°, low 51°.

Pressure29.97 inHg
Wind7.9 mph N
Humidity78%
Visibility—
Dew point52°
Sat, 2464° / 49°0Clear
64 °Clear

Alton, Saturday, 24 October

Clear. High 64°, low 49°.

Pressure29.83 inHg
Wind8.5 mph NW
Humidity56%
Visibility—
Dew point47°
Sun, 2566° / 49°0Clear
66 °Clear

Alton, Sunday, 25 October

Clear. High 66°, low 49°.

Pressure29.85 inHg
Wind7.5 mph NW
Humidity50%
Visibility—
Dew point45°
Mon, 2671° / 52°0Mostly clear
71 °Mostly clear

Alton, Monday, 26 October

Mostly clear. High 71°, low 52°.

Pressure29.80 inHg
Wind7.9 mph NW
Humidity38%
Visibility—
Dew point42°
Tue, 2768° / 53°0Clear
68 °Clear

Alton, Tuesday, 27 October

Clear. High 68°, low 53°.

Pressure29.80 inHg
Wind4.5 mph NW
Humidity27%
Visibility—
Dew point31°

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.