EN
English Español

As of 23:40 PDT

Weather in Alton, CA

52°Current weather

Alton, Sunday, 18 October, 23:40

Overcast. Feels like 51°. High 77°, low 48°.

Pressure30.03 inHg
Wind0 mph N
Humidity92%
Visibility0.6 mi
Dew point50°
Mon, 1967° / 46°0.02Light rain
67 °Light rain

Alton, Monday, 19 October

Light rain. High 67°, low 46°.

Pressure29.97 inHg
Wind3.5 mph N
Humidity57%
Visibility6.2 mi
Dew point42°
Tue, 2059° / 42°0Light rain
59 °Light rain

Alton, Tuesday, 20 October

Light rain. High 59°, low 42°.

Pressure29.94 inHg
Wind3.7 mph W
Humidity66%
Visibility6.2 mi
Dew point47°
Wed, 2163° / 46°0.01Light rain
63 °Light rain

Alton, Wednesday, 21 October

Light rain. High 63°, low 46°.

Pressure29.91 inHg
Wind5.2 mph W
Humidity69%
Visibility6.2 mi
Dew point52°
Thu, 2257° / 51°0.03Light rain
57 °Light rain

Alton, Thursday, 22 October

Light rain. High 57°, low 51°.

Pressure30.03 inHg
Wind4.8 mph W
Humidity83%
Visibility6.2 mi
Dew point52°
Fri, 2358° / 48°0.03Light rain
58 °Light rain

Alton, Friday, 23 October

Light rain. High 58°, low 48°.

Pressure30.24 inHg
Wind14.5 mph N
Humidity63%
Visibility—
Dew point45°
Sat, 2461° / 44°0Partly cloudy
61 °Partly cloudy

Alton, Saturday, 24 October

Partly cloudy. High 61°, low 44°.

Pressure30.15 inHg
Wind6.2 mph NW
Humidity58%
Visibility—
Dew point44°
Sun, 2567° / 47°0Clear
67 °Clear

Alton, Sunday, 25 October

Clear. High 67°, low 47°.

Pressure30.09 inHg
Wind9 mph NW
Humidity34%
Visibility—
Dew point35°
Mon, 2662° / 48°0Clear
62 °Clear

Alton, Monday, 26 October

Clear. High 62°, low 48°.

Pressure29.88 inHg
Wind8.8 mph NW
Humidity59%
Visibility—
Dew point46°
Tue, 2757° / 43°0.07Light rain
57 °Light rain

Alton, Tuesday, 27 October

Light rain. High 57°, low 43°.

Pressure29.91 inHg
Wind10.4 mph N
Humidity65%
Visibility—
Dew point44°
Wed, 2852° / 41°0.15Rain
52 °Rain

Alton, Wednesday, 28 October

Rain. High 52°, low 41°.

Pressure29.97 inHg
Wind5.8 mph SE
Humidity84%
Visibility—
Dew point44°
Thu, 2953° / 46°1.22Heavy rain
53 °Heavy rain

Alton, Thursday, 29 October

Heavy rain. High 53°, low 46°.

Pressure30.03 inHg
Wind6.7 mph SE
Humidity99%
Visibility—
Dew point49°
Fri, 3059° / 46°0.01Light rain
59 °Light rain

Alton, Friday, 30 October

Light rain. High 59°, low 46°.

Pressure30.15 inHg
Wind9.1 mph N
Humidity58%
Visibility—
Dew point43°
Sat, 3163° / 45°0Clear
63 °Clear

Alton, Saturday, 31 October

Clear. High 63°, low 45°.

Pressure30.21 inHg
Wind6.2 mph NW
Humidity47%
Visibility—
Dew point40°
Sun, 0163° / 48°0Overcast
63 °Overcast

Alton, Sunday, 1 November

Overcast. High 63°, low 48°.

Pressure30.15 inHg
Wind5.9 mph NW
Humidity60%
Visibility—
Dew point46°
Mon, 0254° / 46°0.35Light rain
54 °Light rain

Alton, Monday, 2 November

Light rain. High 54°, low 46°.

Pressure30.06 inHg
Wind10.6 mph NW
Humidity89%
Visibility—
Dew point49°

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.