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As of 16:17 PDT

Weather in Alton, CA

62°Current weather

Alton, Saturday, 8 August, 16:17

Clear. Feels like 61°. High 73°, low 57°.

Pressure30.00 inHg
Wind9 mph NW
Humidity64%
Visibility6.2 mi
Dew point53°
Sun, 0971° / 55°0Clear
71 °Clear

Alton, Sunday, 9 August

Clear. High 71°, low 55°.

Pressure29.91 inHg
Wind8.4 mph NW
Humidity55%
Visibility6.2 mi
Dew point52°
Mon, 1075° / 52°0Clear
75 °Clear

Alton, Monday, 10 August

Clear. High 75°, low 52°.

Pressure29.88 inHg
Wind7.7 mph NW
Humidity46%
Visibility6.2 mi
Dew point50°
Tue, 1174° / 52°0Clear
74 °Clear

Alton, Tuesday, 11 August

Clear. High 74°, low 52°.

Pressure29.97 inHg
Wind8.2 mph NW
Humidity49%
Visibility6.2 mi
Dew point52°
Wed, 1272° / 56°0Mostly clear
72 °Mostly clear

Alton, Wednesday, 12 August

Mostly clear. High 72°, low 56°.

Pressure29.88 inHg
Wind8.7 mph NW
Humidity57%
Visibility6.2 mi
Dew point55°
Thu, 1373° / 55°0Overcast
73 °Overcast

Alton, Thursday, 13 August

Overcast. High 73°, low 55°.

Pressure29.85 inHg
Wind8.9 mph NW
Humidity55%
Visibility—
Dew point54°
Fri, 1471° / 54°0Overcast
71 °Overcast

Alton, Friday, 14 August

Overcast. High 71°, low 54°.

Pressure29.94 inHg
Wind6.1 mph W
Humidity63%
Visibility—
Dew point54°
Sat, 1574° / 54°0Partly cloudy
74 °Partly cloudy

Alton, Saturday, 15 August

Partly cloudy. High 74°, low 54°.

Pressure30.03 inHg
Wind8.1 mph W
Humidity55%
Visibility—
Dew point55°
Sun, 1677° / 55°0Partly cloudy
77 °Partly cloudy

Alton, Sunday, 16 August

Partly cloudy. High 77°, low 55°.

Pressure30.03 inHg
Wind7.6 mph NW
Humidity47%
Visibility—
Dew point53°
Mon, 1776° / 53°0Overcast
76 °Overcast

Alton, Monday, 17 August

Overcast. High 76°, low 53°.

Pressure30.06 inHg
Wind8.5 mph W
Humidity47%
Visibility—
Dew point52°
Tue, 1876° / 54°0Partly cloudy
76 °Partly cloudy

Alton, Tuesday, 18 August

Partly cloudy. High 76°, low 54°.

Pressure30.12 inHg
Wind8.6 mph NW
Humidity41%
Visibility—
Dew point49°
Wed, 1976° / 55°0Overcast
76 °Overcast

Alton, Wednesday, 19 August

Overcast. High 76°, low 55°.

Pressure30.06 inHg
Wind8.2 mph NW
Humidity46%
Visibility—
Dew point52°
Thu, 2074° / 56°0Mostly clear
74 °Mostly clear

Alton, Thursday, 20 August

Mostly clear. High 74°, low 56°.

Pressure30.03 inHg
Wind9.5 mph NW
Humidity59%
Visibility—
Dew point57°
Fri, 2175° / 55°0Partly cloudy
75 °Partly cloudy

Alton, Friday, 21 August

Partly cloudy. High 75°, low 55°.

Pressure30.00 inHg
Wind10 mph NW
Humidity49%
Visibility—
Dew point52°
Sat, 2269° / 57°0Partly cloudy
69 °Partly cloudy

Alton, Saturday, 22 August

Partly cloudy. High 69°, low 57°.

Pressure29.94 inHg
Wind8.7 mph NW
Humidity66%
Visibility—
Dew point56°
Sun, 2371° / 56°0Partly cloudy
71 °Partly cloudy

Alton, Sunday, 23 August

Partly cloudy. High 71°, low 56°.

Pressure29.91 inHg
Wind8.8 mph NW
Humidity60%
Visibility—
Dew point55°

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.