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As of 04:15 CDT

Weather in Alton, IA

32°Current weather

Alton, Saturday, 17 October, 04:15

Clear. Feels like 27°. High 58°, low 32°.

Pressure30.50 inHg
Wind5.8 mph S
Humidity88%
Visibility6.2 mi
Dew point30°
Sun, 1863° / 43°0Clear
63 °Clear

Alton, Sunday, 18 October

Clear. High 63°, low 43°.

Pressure30.15 inHg
Wind13.5 mph S
Humidity55%
Visibility6.2 mi
Dew point40°
Mon, 1963° / 44°0Overcast
63 °Overcast

Alton, Monday, 19 October

Overcast. High 63°, low 44°.

Pressure30.24 inHg
Wind8.9 mph S
Humidity69%
Visibility6.2 mi
Dew point47°
Tue, 2067° / 47°0Clear
67 °Clear

Alton, Tuesday, 20 October

Clear. High 67°, low 47°.

Pressure30.21 inHg
Wind10.8 mph S
Humidity62%
Visibility6.2 mi
Dew point48°
Wed, 2170° / 51°0Clear
70 °Clear

Alton, Wednesday, 21 October

Clear. High 70°, low 51°.

Pressure30.12 inHg
Wind10 mph S
Humidity61%
Visibility—
Dew point51°
Thu, 2272° / 50°0Clear
72 °Clear

Alton, Thursday, 22 October

Clear. High 72°, low 50°.

Pressure30.18 inHg
Wind9.8 mph SE
Humidity62%
Visibility—
Dew point53°
Fri, 2374° / 63°0.16Light rain
74 °Light rain

Alton, Friday, 23 October

Light rain. High 74°, low 63°.

Pressure29.83 inHg
Wind22.1 mph S
Humidity61%
Visibility—
Dew point58°
Sat, 2469° / 57°0.02Light rain
69 °Light rain

Alton, Saturday, 24 October

Light rain. High 69°, low 57°.

Pressure29.91 inHg
Wind20.8 mph S
Humidity59%
Visibility—
Dew point53°
Sun, 2547° / 41°1.14Heavy rain
47 °Heavy rain

Alton, Sunday, 25 October

Heavy rain. High 47°, low 41°.

Pressure30.21 inHg
Wind15.1 mph N
Humidity59%
Visibility—
Dew point33°
Mon, 2647° / 33°0Clear
47 °Clear

Alton, Monday, 26 October

Clear. High 47°, low 33°.

Pressure30.36 inHg
Wind9.9 mph N
Humidity43%
Visibility—
Dew point22°
Tue, 2749° / 37°0.19Rain
49 °Rain

Alton, Tuesday, 27 October

Rain. High 49°, low 37°.

Pressure30.15 inHg
Wind21.5 mph S
Humidity50%
Visibility—
Dew point30°
Wed, 2867° / 48°0.04Light rain
67 °Light rain

Alton, Wednesday, 28 October

Light rain. High 67°, low 48°.

Pressure29.62 inHg
Wind26.4 mph W
Humidity92%
Visibility—
Dew point54°
Thu, 2960° / 43°0.01Light rain
60 °Light rain

Alton, Thursday, 29 October

Light rain. High 60°, low 43°.

Pressure30.09 inHg
Wind25.6 mph NW
Humidity47%
Visibility—
Dew point35°
Fri, 3063° / 51°0.18Light rain
63 °Light rain

Alton, Friday, 30 October

Light rain. High 63°, low 51°.

Pressure29.65 inHg
Wind18.5 mph S
Humidity78%
Visibility—
Dew point52°
Sat, 3163° / 40°0.46Rain
63 °Rain

Alton, Saturday, 31 October

Rain. High 63°, low 40°.

Pressure29.23 inHg
Wind24.8 mph NW
Humidity92%
Visibility—
Dew point55°
Sun, 0150° / 40°0Clear
50 °Clear

Alton, Sunday, 1 November

Clear. High 50°, low 40°.

Pressure30.00 inHg
Wind19.9 mph NW
Humidity53%
Visibility—
Dew point31°

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.