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As of 15:19 PDT

Weather in Alton, CA

67°Current weather

Alton, Tuesday, 20 October, 15:19

Overcast. Feels like 66°. High 67°, low 48°.

Pressure29.88 inHg
Wind3 mph N
Humidity59%
Visibility6.2 mi
Dew point53°
Wed, 2171° / 49°0Overcast
71 °Overcast

Alton, Wednesday, 21 October

Overcast. High 71°, low 49°.

Pressure29.88 inHg
Wind2.1 mph NW
Humidity57%
Visibility6.2 mi
Dew point51°
Thu, 2257° / 50°0Overcast
57 °Overcast

Alton, Thursday, 22 October

Overcast. High 57°, low 50°.

Pressure30.00 inHg
Wind4.3 mph W
Humidity84%
Visibility3.9 mi
Dew point52°
Fri, 2358° / 44°0Clear
58 °Clear

Alton, Friday, 23 October

Clear. High 58°, low 44°.

Pressure30.18 inHg
Wind10.2 mph N
Humidity64%
Visibility5.0 mi
Dew point45°
Sat, 2463° / 41°0Overcast
63 °Overcast

Alton, Saturday, 24 October

Overcast. High 63°, low 41°.

Pressure30.03 inHg
Wind2.2 mph NW
Humidity48%
Visibility6.2 mi
Dew point41°
Sun, 2566° / 44°0Overcast
66 °Overcast

Alton, Sunday, 25 October

Overcast. High 66°, low 44°.

Pressure30.06 inHg
Wind6.3 mph SE
Humidity53%
Visibility—
Dew point46°
Mon, 2676° / 49°0Overcast
76 °Overcast

Alton, Monday, 26 October

Overcast. High 76°, low 49°.

Pressure30.06 inHg
Wind5.5 mph NW
Humidity18%
Visibility—
Dew point26°
Tue, 2772° / 55°0Overcast
72 °Overcast

Alton, Tuesday, 27 October

Overcast. High 72°, low 55°.

Pressure29.97 inHg
Wind5.4 mph NW
Humidity18%
Visibility—
Dew point25°
Wed, 2873° / 54°0Overcast
73 °Overcast

Alton, Wednesday, 28 October

Overcast. High 73°, low 54°.

Pressure29.91 inHg
Wind4.9 mph NW
Humidity22%
Visibility—
Dew point29°
Thu, 2969° / 53°0.06Light rain
69 °Light rain

Alton, Thursday, 29 October

Light rain. High 69°, low 53°.

Pressure29.94 inHg
Wind3.8 mph SE
Humidity41%
Visibility—
Dew point43°
Fri, 3063° / 49°0Overcast
63 °Overcast

Alton, Friday, 30 October

Overcast. High 63°, low 49°.

Pressure29.91 inHg
Wind5.6 mph N
Humidity49%
Visibility—
Dew point42°
Sat, 3157° / 47°0Overcast
57 °Overcast

Alton, Saturday, 31 October

Overcast. High 57°, low 47°.

Pressure29.85 inHg
Wind7.1 mph N
Humidity71%
Visibility—
Dew point47°
Sun, 0169° / 46°0Clear
69 °Clear

Alton, Sunday, 1 November

Clear. High 69°, low 46°.

Pressure29.88 inHg
Wind5.7 mph NW
Humidity42%
Visibility—
Dew point42°
Mon, 0276° / 52°0Overcast
76 °Overcast

Alton, Monday, 2 November

Overcast. High 76°, low 52°.

Pressure30.00 inHg
Wind9.2 mph SW
Humidity30%
Visibility—
Dew point39°
Tue, 0371° / 55°0.13Light rain
71 °Light rain

Alton, Tuesday, 3 November

Light rain. High 71°, low 55°.

Pressure29.97 inHg
Wind13.2 mph S
Humidity41%
Visibility—
Dew point44°
Wed, 0462° / 55°0.58Rain
62 °Rain

Alton, Wednesday, 4 November

Rain. High 62°, low 55°.

Pressure29.88 inHg
Wind16 mph SE
Humidity91%
Visibility—
Dew point57°

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.