EN
English Español

As of 15:23 PDT

Weather in Alton, CA

67°Current weather

Alton, Friday, 16 October, 15:23

Clear. Feels like 67°. High 74°, low 49°.

Pressure30.09 inHg
Wind12.7 mph NW
Humidity63%
Visibility6.2 mi
Dew point58°
Sat, 1776° / 47°0Overcast
76 °Overcast

Alton, Saturday, 17 October

Overcast. High 76°, low 47°.

Pressure30.18 inHg
Wind5.5 mph NW
Humidity83%
Visibility2.1 mi
Dew point54°
Sun, 1856° / 46°0Overcast
56 °Overcast

Alton, Sunday, 18 October

Overcast. High 56°, low 46°.

Pressure30.06 inHg
Wind4 mph W
Humidity89%
Visibility5.4 mi
Dew point52°
Mon, 1962° / 46°0.05Light rain
62 °Light rain

Alton, Monday, 19 October

Light rain. High 62°, low 46°.

Pressure29.97 inHg
Wind3.1 mph SW
Humidity54%
Visibility6.2 mi
Dew point44°
Tue, 2059° / 45°0.4Rain
59 °Rain

Alton, Tuesday, 20 October

Rain. High 59°, low 45°.

Pressure29.91 inHg
Wind3.5 mph W
Humidity82%
Visibility6.2 mi
Dew point52°
Wed, 2162° / 44°0Clear
62 °Clear

Alton, Wednesday, 21 October

Clear. High 62°, low 44°.

Pressure29.88 inHg
Wind4.3 mph NW
Humidity72%
Visibility—
Dew point51°
Thu, 2260° / 47°0Overcast
60 °Overcast

Alton, Thursday, 22 October

Overcast. High 60°, low 47°.

Pressure30.00 inHg
Wind8 mph N
Humidity50%
Visibility—
Dew point40°
Fri, 2358° / 45°0Clear
58 °Clear

Alton, Friday, 23 October

Clear. High 58°, low 45°.

Pressure30.12 inHg
Wind12.6 mph N
Humidity53%
Visibility—
Dew point40°
Sat, 2466° / 43°0Mostly clear
66 °Mostly clear

Alton, Saturday, 24 October

Mostly clear. High 66°, low 43°.

Pressure30.09 inHg
Wind7.2 mph NW
Humidity24%
Visibility—
Dew point25°
Sun, 2556° / 45°0.12Light rain
56 °Light rain

Alton, Sunday, 25 October

Light rain. High 56°, low 45°.

Pressure30.06 inHg
Wind5.1 mph SE
Humidity80%
Visibility—
Dew point47°
Mon, 2659° / 43°0Light rain
59 °Light rain

Alton, Monday, 26 October

Light rain. High 59°, low 43°.

Pressure29.85 inHg
Wind6.2 mph W
Humidity58%
Visibility—
Dew point42°
Tue, 2761° / 42°0.01Light rain
61 °Light rain

Alton, Tuesday, 27 October

Light rain. High 61°, low 42°.

Pressure29.77 inHg
Wind5.5 mph SE
Humidity45%
Visibility—
Dew point37°
Wed, 2860° / 48°0.03Light rain
60 °Light rain

Alton, Wednesday, 28 October

Light rain. High 60°, low 48°.

Pressure29.94 inHg
Wind6.4 mph SE
Humidity64%
Visibility—
Dew point45°
Thu, 2961° / 48°0.59Rain
61 °Rain

Alton, Thursday, 29 October

Rain. High 61°, low 48°.

Pressure30.06 inHg
Wind7.7 mph E
Humidity67%
Visibility—
Dew point49°
Fri, 3063° / 46°0.01Light rain
63 °Light rain

Alton, Friday, 30 October

Light rain. High 63°, low 46°.

Pressure30.09 inHg
Wind7.6 mph NW
Humidity50%
Visibility—
Dew point42°
Sat, 3157° / 46°0Overcast
57 °Overcast

Alton, Saturday, 31 October

Overcast. High 57°, low 46°.

Pressure30.21 inHg
Wind3.5 mph N
Humidity63%
Visibility—
Dew point43°

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.