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As of 22:02 CDT

Weather in Alton, IA

46°Current weather

Alton, Thursday, 15 October, 22:02

Overcast. Feels like 39°. High 51°, low 46°.

Pressure30.21 inHg
Wind19.4 mph NW
Humidity77%
Visibility6.2 mi
Dew point39°
Fri, 1650° / 36°0Clear
50 °Clear

Alton, Friday, 16 October

Clear. High 50°, low 36°.

Pressure30.59 inHg
Wind18.5 mph N
Humidity53%
Visibility6.2 mi
Dew point29°
Sat, 1758° / 34°0Clear
58 °Clear

Alton, Saturday, 17 October

Clear. High 58°, low 34°.

Pressure30.42 inHg
Wind14.8 mph S
Humidity45%
Visibility6.2 mi
Dew point30°
Sun, 1862° / 42°0Clear
62 °Clear

Alton, Sunday, 18 October

Clear. High 62°, low 42°.

Pressure30.18 inHg
Wind13.3 mph S
Humidity55%
Visibility6.2 mi
Dew point39°
Mon, 1958° / 46°0Overcast
58 °Overcast

Alton, Monday, 19 October

Overcast. High 58°, low 46°.

Pressure30.18 inHg
Wind10.9 mph S
Humidity69%
Visibility6.2 mi
Dew point45°
Tue, 2067° / 48°0Clear
67 °Clear

Alton, Tuesday, 20 October

Clear. High 67°, low 48°.

Pressure30.12 inHg
Wind13.1 mph SE
Humidity55%
Visibility—
Dew point45°
Wed, 2170° / 54°0.06Light rain
70 °Light rain

Alton, Wednesday, 21 October

Light rain. High 70°, low 54°.

Pressure30.06 inHg
Wind14.6 mph S
Humidity59%
Visibility—
Dew point50°
Thu, 2275° / 55°0.01Light rain
75 °Light rain

Alton, Thursday, 22 October

Light rain. High 75°, low 55°.

Pressure30.03 inHg
Wind14.7 mph S
Humidity67%
Visibility—
Dew point58°
Fri, 2370° / 64°0Overcast
70 °Overcast

Alton, Friday, 23 October

Overcast. High 70°, low 64°.

Pressure29.88 inHg
Wind23.5 mph S
Humidity40%
Visibility—
Dew point44°
Sat, 2463° / 49°0Clear
63 °Clear

Alton, Saturday, 24 October

Clear. High 63°, low 49°.

Pressure30.12 inHg
Wind24.9 mph S
Humidity39%
Visibility—
Dew point32°
Sun, 2551° / 41°0Overcast
51 °Overcast

Alton, Sunday, 25 October

Overcast. High 51°, low 41°.

Pressure30.42 inHg
Wind11.5 mph NW
Humidity47%
Visibility—
Dew point28°
Mon, 2646° / 42°1.13Rain
46 °Rain

Alton, Monday, 26 October

Rain. High 46°, low 42°.

Pressure30.00 inHg
Wind16 mph NE
Humidity93%
Visibility—
Dew point42°
Tue, 2749° / 41°0.01Light rain
49 °Light rain

Alton, Tuesday, 27 October

Light rain. High 49°, low 41°.

Pressure30.03 inHg
Wind11.3 mph NW
Humidity77%
Visibility—
Dew point39°
Wed, 2845° / 40°0.36Rain
45 °Rain

Alton, Wednesday, 28 October

Rain. High 45°, low 40°.

Pressure29.91 inHg
Wind13.3 mph NW
Humidity94%
Visibility—
Dew point39°
Thu, 2955° / 37°0Mostly clear
55 °Mostly clear

Alton, Thursday, 29 October

Mostly clear. High 55°, low 37°.

Pressure29.97 inHg
Wind10.6 mph W
Humidity58%
Visibility—
Dew point36°
Fri, 3058° / 41°0Clear
58 °Clear

Alton, Friday, 30 October

Clear. High 58°, low 41°.

Pressure30.06 inHg
Wind7.6 mph W
Humidity39%
Visibility—
Dew point29°

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, IA 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, IA 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.