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As of 00:31 PDT

Weather in Alton, CA

46°Current weather

Alton, Tuesday, 13 October, 00:31

Mostly clear. Feels like 42°. High 65°, low 39°.

Pressure30.06 inHg
Wind6.9 mph E
Humidity94%
Visibility6.2 mi
Dew point44°
Wed, 1465° / 40°0Clear
65 °Clear

Alton, Wednesday, 14 October

Clear. High 65°, low 40°.

Pressure30.18 inHg
Wind4.8 mph NW
Humidity61%
Visibility6.2 mi
Dew point49°
Thu, 1578° / 50°0Clear
78 °Clear

Alton, Thursday, 15 October

Clear. High 78°, low 50°.

Pressure30.09 inHg
Wind2.3 mph N
Humidity48%
Visibility6.2 mi
Dew point56°
Fri, 1662° / 49°0Partly cloudy
62 °Partly cloudy

Alton, Friday, 16 October

Partly cloudy. High 62°, low 49°.

Pressure30.15 inHg
Wind3.7 mph NW
Humidity80%
Visibility2.9 mi
Dew point53°
Sat, 1758° / 51°0Overcast
58 °Overcast

Alton, Saturday, 17 October

Overcast. High 58°, low 51°.

Pressure30.09 inHg
Wind8 mph NW
Humidity86%
Visibility—
Dew point53°
Sun, 1860° / 47°0Overcast
60 °Overcast

Alton, Sunday, 18 October

Overcast. High 60°, low 47°.

Pressure30.00 inHg
Wind8.1 mph NW
Humidity65%
Visibility—
Dew point47°
Mon, 1959° / 47°0.5Rain
59 °Rain

Alton, Monday, 19 October

Rain. High 59°, low 47°.

Pressure29.97 inHg
Wind5.9 mph SE
Humidity70%
Visibility—
Dew point48°
Tue, 2058° / 46°0.31Rain
58 °Rain

Alton, Tuesday, 20 October

Rain. High 58°, low 46°.

Pressure30.00 inHg
Wind8.8 mph NW
Humidity60%
Visibility—
Dew point43°
Wed, 2160° / 45°0Clear
60 °Clear

Alton, Wednesday, 21 October

Clear. High 60°, low 45°.

Pressure30.15 inHg
Wind8.8 mph NW
Humidity54%
Visibility—
Dew point42°
Thu, 2262° / 47°0.01Light rain
62 °Light rain

Alton, Thursday, 22 October

Light rain. High 62°, low 47°.

Pressure30.24 inHg
Wind5.4 mph SE
Humidity80%
Visibility—
Dew point52°
Fri, 2363° / 46°0Clear
63 °Clear

Alton, Friday, 23 October

Clear. High 63°, low 46°.

Pressure30.27 inHg
Wind7.7 mph NW
Humidity50%
Visibility—
Dew point42°
Sat, 2471° / 51°0Clear
71 °Clear

Alton, Saturday, 24 October

Clear. High 71°, low 51°.

Pressure30.24 inHg
Wind6.8 mph N
Humidity32%
Visibility—
Dew point37°
Sun, 2581° / 59°0Overcast
81 °Overcast

Alton, Sunday, 25 October

Overcast. High 81°, low 59°.

Pressure30.03 inHg
Wind5.7 mph NW
Humidity25%
Visibility—
Dew point40°
Mon, 2682° / 61°0Clear
82 °Clear

Alton, Monday, 26 October

Clear. High 82°, low 61°.

Pressure30.09 inHg
Wind6.6 mph SE
Humidity21%
Visibility—
Dew point36°
Tue, 2779° / 58°0Clear
79 °Clear

Alton, Tuesday, 27 October

Clear. High 79°, low 58°.

Pressure30.12 inHg
Wind6.2 mph NW
Humidity27%
Visibility—
Dew point38°
Wed, 2866° / 53°0Clear
66 °Clear

Alton, Wednesday, 28 October

Clear. High 66°, low 53°.

Pressure30.06 inHg
Wind5.7 mph NW
Humidity47%
Visibility—
Dew point44°

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.