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As of 08:28 CDT

Weather in Alton, IA

61°Current weather

Alton, Monday, 12 October, 08:28

Clear. Feels like 61°. High 84°, low 56°.

Pressure29.65 inHg
Wind5.6 mph S
Humidity89%
Visibility6.2 mi
Dew point57°
Tue, 1365° / 47°0Mostly clear
65 °Mostly clear

Alton, Tuesday, 13 October

Mostly clear. High 65°, low 47°.

Pressure29.97 inHg
Wind7.8 mph N
Humidity58%
Visibility6.2 mi
Dew point44°
Wed, 1462° / 46°0Mostly clear
62 °Mostly clear

Alton, Wednesday, 14 October

Mostly clear. High 62°, low 46°.

Pressure30.21 inHg
Wind7.9 mph NE
Humidity56%
Visibility6.2 mi
Dew point41°
Thu, 1561° / 51°0.16Rain
61 °Rain

Alton, Thursday, 15 October

Rain. High 61°, low 51°.

Pressure30.21 inHg
Wind9.3 mph N
Humidity70%
Visibility4.3 mi
Dew point47°
Fri, 1655° / 42°0Clear
55 °Clear

Alton, Friday, 16 October

Clear. High 55°, low 42°.

Pressure30.68 inHg
Wind17.2 mph N
Humidity47%
Visibility—
Dew point31°
Sat, 1761° / 39°0Clear
61 °Clear

Alton, Saturday, 17 October

Clear. High 61°, low 39°.

Pressure30.33 inHg
Wind15.6 mph S
Humidity39%
Visibility—
Dew point30°
Sun, 1866° / 44°0Clear
66 °Clear

Alton, Sunday, 18 October

Clear. High 66°, low 44°.

Pressure29.94 inHg
Wind18.3 mph S
Humidity40%
Visibility—
Dew point35°
Mon, 1968° / 49°0Overcast
68 °Overcast

Alton, Monday, 19 October

Overcast. High 68°, low 49°.

Pressure30.06 inHg
Wind12.4 mph S
Humidity53%
Visibility—
Dew point45°
Tue, 2069° / 51°0Mostly clear
69 °Mostly clear

Alton, Tuesday, 20 October

Mostly clear. High 69°, low 51°.

Pressure30.06 inHg
Wind12.5 mph SE
Humidity63%
Visibility—
Dew point52°
Wed, 2177° / 57°0.15Light rain
77 °Light rain

Alton, Wednesday, 21 October

Light rain. High 77°, low 57°.

Pressure30.03 inHg
Wind19 mph S
Humidity61%
Visibility—
Dew point57°
Thu, 2267° / 63°0.78Rain
67 °Rain

Alton, Thursday, 22 October

Rain. High 67°, low 63°.

Pressure30.06 inHg
Wind17.4 mph S
Humidity93%
Visibility—
Dew point64°
Fri, 2367° / 61°1.65Heavy rain
67 °Heavy rain

Alton, Friday, 23 October

Heavy rain. High 67°, low 61°.

Pressure30.09 inHg
Wind22.2 mph SE
Humidity88%
Visibility—
Dew point62°
Sat, 2468° / 53°1.07Heavy rain
68 °Heavy rain

Alton, Saturday, 24 October

Heavy rain. High 68°, low 53°.

Pressure29.65 inHg
Wind26.8 mph SW
Humidity48%
Visibility—
Dew point45°
Sun, 2555° / 45°0Partly cloudy
55 °Partly cloudy

Alton, Sunday, 25 October

Partly cloudy. High 55°, low 45°.

Pressure30.27 inHg
Wind24.3 mph NW
Humidity48%
Visibility—
Dew point33°
Mon, 2664° / 42°0Clear
64 °Clear

Alton, Monday, 26 October

Clear. High 64°, low 42°.

Pressure30.21 inHg
Wind11.6 mph W
Humidity48%
Visibility—
Dew point38°
Tue, 2760° / 46°0Clear
60 °Clear

Alton, Tuesday, 27 October

Clear. High 60°, low 46°.

Pressure30.12 inHg
Wind18.9 mph N
Humidity46%
Visibility—
Dew point38°

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.