As of 15:11 PDT

Weather in Alton, CA

74°

Alton, Thursday, 15 October, 15:11

Clear. Feels like 74°. High 79°, low 50°.

Pressure30.12 inHg

Wind12.7 mph NW

Humidity46%

Visibility6.2 mi

Dew point55°

See detailed hourly forecast

Fri, 1677° / 47°

77 °

Alton, Friday, 16 October

Clear. High 77°, low 47°.

Pressure30.12 inHg

Wind4.3 mph NW

Humidity65%

Visibility2.4 mi

Dew point53°

Sat, 1761° / 46°

61 °

Alton, Saturday, 17 October

Mostly clear. High 61°, low 46°.

Pressure30.18 inHg

Wind5.3 mph NW

Humidity81%

Visibility1.2 mi

Dew point54°

Sun, 1856° / 49°

56 °

Alton, Sunday, 18 October

Light rain. High 56°, low 49°.

Pressure30.03 inHg

Wind5.1 mph W

Humidity90%

Visibility5.6 mi

Dew point52°

Mon, 1960° / 42°

60 °

Alton, Monday, 19 October

Overcast. High 60°, low 42°.

Pressure29.94 inHg

Wind3.7 mph S

Humidity58%

Visibility6.2 mi

Dew point45°

Tue, 2062° / 48°

62 °

Alton, Tuesday, 20 October

Overcast. High 62°, low 48°.

Pressure29.91 inHg

Wind8.4 mph NW

Humidity63%

Visibility—

Dew point47°

Wed, 2163° / 46°

63 °

Alton, Wednesday, 21 October

Clear. High 63°, low 46°.

Pressure29.94 inHg

Wind7.7 mph NW

Humidity58%

Visibility—

Dew point45°

Thu, 2262° / 47°

62 °

Alton, Thursday, 22 October

Clear. High 62°, low 47°.

Pressure30.12 inHg

Wind8 mph NW

Humidity55%

Visibility—

Dew point44°

Fri, 2360° / 45°

60 °

Alton, Friday, 23 October

Clear. High 60°, low 45°.

Pressure30.30 inHg

Wind11.5 mph N

Humidity62%

Visibility—

Dew point46°

Sat, 2463° / 41°

63 °

Alton, Saturday, 24 October

Mostly clear. High 63°, low 41°.

Pressure30.30 inHg

Wind7.9 mph N

Humidity33%

Visibility—

Dew point31°

Sun, 2569° / 48°

69 °

Alton, Sunday, 25 October

Overcast. High 69°, low 48°.

Pressure30.15 inHg

Wind8.7 mph NW

Humidity22%

Visibility—

Dew point26°

Mon, 2669° / 50°

69 °

Alton, Monday, 26 October

Overcast. High 69°, low 50°.

Pressure30.09 inHg

Wind7.6 mph NW

Humidity28%

Visibility—

Dew point32°

Tue, 2769° / 53°

69 °

Alton, Tuesday, 27 October

Overcast. High 69°, low 53°.

Pressure30.12 inHg

Wind6 mph NW

Humidity52%

Visibility—

Dew point49°

Wed, 2865° / 52°

65 °

Alton, Wednesday, 28 October

Overcast. High 65°, low 52°.

Pressure30.18 inHg

Wind6.9 mph NW

Humidity67%

Visibility—

Dew point52°

Thu, 2980° / 59°

80 °

Alton, Thursday, 29 October

Overcast. High 80°, low 59°.

Pressure30.00 inHg

Wind6.7 mph E

Humidity18%

Visibility—

Dew point30°

Fri, 3080° / 61°

80 °

Alton, Friday, 30 October

Clear. High 80°, low 61°.

Pressure29.97 inHg

Wind5.6 mph SE

Humidity24%

Visibility—

Dew point37°

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.