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As of 23:21 PDT

Weather in Alton, CA

55°Current weather

Alton, Thursday, 15 October, 23:21

Clear. Feels like 54°. High 85°, low 50°.

Pressure30.15 inHg
Wind4.6 mph SE
Humidity87%
Visibility6.2 mi
Dew point50°
Fri, 1678° / 48°0Clear
78 °Clear

Alton, Friday, 16 October

Clear. High 78°, low 48°.

Pressure30.15 inHg
Wind4.5 mph NW
Humidity62%
Visibility6.2 mi
Dew point53°
Sat, 1766° / 48°0Mostly clear
66 °Mostly clear

Alton, Saturday, 17 October

Mostly clear. High 66°, low 48°.

Pressure30.18 inHg
Wind5.3 mph NW
Humidity82%
Visibility0.9 mi
Dew point54°
Sun, 1856° / 50°0Overcast
56 °Overcast

Alton, Sunday, 18 October

Overcast. High 56°, low 50°.

Pressure30.03 inHg
Wind4.4 mph W
Humidity87%
Visibility6.2 mi
Dew point53°
Mon, 1958° / 40°0.08Light rain
58 °Light rain

Alton, Monday, 19 October

Light rain. High 58°, low 40°.

Pressure29.97 inHg
Wind4.7 mph S
Humidity65%
Visibility6.2 mi
Dew point46°
Tue, 2062° / 48°0.12Light rain
62 °Light rain

Alton, Tuesday, 20 October

Light rain. High 62°, low 48°.

Pressure29.85 inHg
Wind12.9 mph SE
Humidity70%
Visibility—
Dew point50°
Wed, 2161° / 46°0Clear
61 °Clear

Alton, Wednesday, 21 October

Clear. High 61°, low 46°.

Pressure29.88 inHg
Wind6.4 mph NW
Humidity64%
Visibility—
Dew point47°
Thu, 2262° / 52°0Mostly clear
62 °Mostly clear

Alton, Thursday, 22 October

Mostly clear. High 62°, low 52°.

Pressure30.09 inHg
Wind9.4 mph NW
Humidity59%
Visibility—
Dew point46°
Fri, 2365° / 45°0Mostly clear
65 °Mostly clear

Alton, Friday, 23 October

Mostly clear. High 65°, low 45°.

Pressure30.21 inHg
Wind8.6 mph NW
Humidity41%
Visibility—
Dew point38°
Sat, 2471° / 46°0Partly cloudy
71 °Partly cloudy

Alton, Saturday, 24 October

Partly cloudy. High 71°, low 46°.

Pressure30.18 inHg
Wind7.6 mph NW
Humidity21%
Visibility—
Dew point26°
Sun, 2567° / 45°0Overcast
67 °Overcast

Alton, Sunday, 25 October

Overcast. High 67°, low 45°.

Pressure30.24 inHg
Wind8 mph NW
Humidity28%
Visibility—
Dew point31°
Mon, 2663° / 47°0Overcast
63 °Overcast

Alton, Monday, 26 October

Overcast. High 63°, low 47°.

Pressure30.00 inHg
Wind8.7 mph NW
Humidity49%
Visibility—
Dew point41°
Tue, 2768° / 47°0Overcast
68 °Overcast

Alton, Tuesday, 27 October

Overcast. High 68°, low 47°.

Pressure29.83 inHg
Wind6.1 mph NW
Humidity34%
Visibility—
Dew point36°
Wed, 2866° / 50°0Overcast
66 °Overcast

Alton, Wednesday, 28 October

Overcast. High 66°, low 50°.

Pressure29.97 inHg
Wind6.9 mph NW
Humidity52%
Visibility—
Dew point46°
Thu, 2960° / 51°0.15Light rain
60 °Light rain

Alton, Thursday, 29 October

Light rain. High 60°, low 51°.

Pressure30.00 inHg
Wind3.6 mph N
Humidity81%
Visibility—
Dew point51°
Fri, 3063° / 46°0Clear
63 °Clear

Alton, Friday, 30 October

Clear. High 63°, low 46°.

Pressure30.18 inHg
Wind7.3 mph NW
Humidity47%
Visibility—
Dew point40°

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.