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As of 01:58 CDT

Weather in Alton, IA

47°Current weather

Alton, Thursday, 15 October, 01:58

Overcast. Feels like 46°. High 54°, low 47°.

Pressure30.12 inHg
Wind3.6 mph E
Humidity95%
Visibility6.2 mi
Dew point46°
Fri, 1651° / 38°0Clear
51 °Clear

Alton, Friday, 16 October

Clear. High 51°, low 38°.

Pressure30.56 inHg
Wind18.2 mph N
Humidity56%
Visibility6.2 mi
Dew point27°
Sat, 1758° / 34°0Clear
58 °Clear

Alton, Saturday, 17 October

Clear. High 58°, low 34°.

Pressure30.45 inHg
Wind14.2 mph S
Humidity46%
Visibility6.2 mi
Dew point30°
Sun, 1862° / 42°0Clear
62 °Clear

Alton, Sunday, 18 October

Clear. High 62°, low 42°.

Pressure30.21 inHg
Wind12.5 mph S
Humidity54%
Visibility6.2 mi
Dew point38°
Mon, 1961° / 44°0Overcast
61 °Overcast

Alton, Monday, 19 October

Overcast. High 61°, low 44°.

Pressure30.24 inHg
Wind9 mph SE
Humidity61%
Visibility—
Dew point44°
Tue, 2067° / 47°0Clear
67 °Clear

Alton, Tuesday, 20 October

Clear. High 67°, low 47°.

Pressure30.18 inHg
Wind13.3 mph S
Humidity54%
Visibility—
Dew point45°
Wed, 2165° / 57°0.12Light rain
65 °Light rain

Alton, Wednesday, 21 October

Light rain. High 65°, low 57°.

Pressure30.03 inHg
Wind18 mph S
Humidity64%
Visibility—
Dew point51°
Thu, 2265° / 62°0.44Rain
65 °Rain

Alton, Thursday, 22 October

Rain. High 65°, low 62°.

Pressure29.88 inHg
Wind21.5 mph S
Humidity75%
Visibility—
Dew point55°
Fri, 2364° / 53°1.35Heavy rain
64 °Heavy rain

Alton, Friday, 23 October

Heavy rain. High 64°, low 53°.

Pressure29.80 inHg
Wind25.3 mph S
Humidity70%
Visibility—
Dew point49°
Sat, 2451° / 45°0.07Light rain
51 °Light rain

Alton, Saturday, 24 October

Light rain. High 51°, low 45°.

Pressure30.30 inHg
Wind10.8 mph NW
Humidity68%
Visibility—
Dew point40°
Sun, 2551° / 37°0Overcast
51 °Overcast

Alton, Sunday, 25 October

Overcast. High 51°, low 37°.

Pressure30.36 inHg
Wind9.6 mph W
Humidity41%
Visibility—
Dew point25°
Mon, 2656° / 39°0.01Light rain
56 °Light rain

Alton, Monday, 26 October

Light rain. High 56°, low 39°.

Pressure30.09 inHg
Wind11.1 mph NW
Humidity52%
Visibility—
Dew point34°
Tue, 2753° / 39°0Clear
53 °Clear

Alton, Tuesday, 27 October

Clear. High 53°, low 39°.

Pressure30.15 inHg
Wind8.1 mph W
Humidity59%
Visibility—
Dew point36°
Wed, 2862° / 44°0Overcast
62 °Overcast

Alton, Wednesday, 28 October

Overcast. High 62°, low 44°.

Pressure29.68 inHg
Wind18.9 mph SW
Humidity55%
Visibility—
Dew point39°
Thu, 2955° / 43°0Clear
55 °Clear

Alton, Thursday, 29 October

Clear. High 55°, low 43°.

Pressure30.12 inHg
Wind12.7 mph NW
Humidity37%
Visibility—
Dew point26°
Fri, 3062° / 47°0Partly cloudy
62 °Partly cloudy

Alton, Friday, 30 October

Partly cloudy. High 62°, low 47°.

Pressure29.68 inHg
Wind23.3 mph S
Humidity58%
Visibility—
Dew point46°

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.