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As of 13:11 CDT

Weather in Alton, IA

64°Current weather

Alton, Sunday, 18 October, 13:11

Clear. Feels like 63°. High 64°, low 43°.

Pressure30.12 inHg
Wind13 mph S
Humidity47%
Visibility6.2 mi
Dew point43°
Mon, 1963° / 43°0Mostly clear
63 °Mostly clear

Alton, Monday, 19 October

Mostly clear. High 63°, low 43°.

Pressure30.27 inHg
Wind6.8 mph SE
Humidity64%
Visibility6.2 mi
Dew point45°
Tue, 2066° / 46°0Mostly clear
66 °Mostly clear

Alton, Tuesday, 20 October

Mostly clear. High 66°, low 46°.

Pressure30.24 inHg
Wind10 mph S
Humidity63%
Visibility6.2 mi
Dew point48°
Wed, 2170° / 50°0Clear
70 °Clear

Alton, Wednesday, 21 October

Clear. High 70°, low 50°.

Pressure30.18 inHg
Wind6.5 mph S
Humidity67%
Visibility6.2 mi
Dew point52°
Thu, 2271° / 52°0Clear
71 °Clear

Alton, Thursday, 22 October

Clear. High 71°, low 52°.

Pressure30.21 inHg
Wind9 mph S
Humidity62%
Visibility6.2 mi
Dew point52°
Fri, 2371° / 55°0.11Light rain
71 °Light rain

Alton, Friday, 23 October

Light rain. High 71°, low 55°.

Pressure30.00 inHg
Wind20.3 mph SE
Humidity53%
Visibility—
Dew point49°
Sat, 2464° / 48°0.26Light rain
64 °Light rain

Alton, Saturday, 24 October

Light rain. High 64°, low 48°.

Pressure30.18 inHg
Wind17.1 mph S
Humidity78%
Visibility—
Dew point49°
Sun, 2555° / 40°0Clear
55 °Clear

Alton, Sunday, 25 October

Clear. High 55°, low 40°.

Pressure30.47 inHg
Wind8.7 mph SE
Humidity36%
Visibility—
Dew point25°
Mon, 2656° / 45°0.04Light rain
56 °Light rain

Alton, Monday, 26 October

Light rain. High 56°, low 45°.

Pressure30.15 inHg
Wind9.4 mph S
Humidity92%
Visibility—
Dew point50°
Tue, 2759° / 52°0.21Light rain
59 °Light rain

Alton, Tuesday, 27 October

Light rain. High 59°, low 52°.

Pressure30.09 inHg
Wind15.6 mph S
Humidity74%
Visibility—
Dew point50°
Wed, 2867° / 52°0.19Light rain
67 °Light rain

Alton, Wednesday, 28 October

Light rain. High 67°, low 52°.

Pressure29.71 inHg
Wind17.5 mph S
Humidity74%
Visibility—
Dew point51°
Thu, 2960° / 46°0Clear
60 °Clear

Alton, Thursday, 29 October

Clear. High 60°, low 46°.

Pressure29.80 inHg
Wind11.3 mph W
Humidity41%
Visibility—
Dew point33°
Fri, 3059° / 39°0.09Light rain
59 °Light rain

Alton, Friday, 30 October

Light rain. High 59°, low 39°.

Pressure29.44 inHg
Wind21.6 mph W
Humidity74%
Visibility—
Dew point47°
Sat, 3137° / 33°0.23Snow
37 °Snow

Alton, Saturday, 31 October

Snow. High 37°, low 33°.

Pressure29.56 inHg
Wind29.9 mph W
Humidity96%
Visibility—
Dew point32°
Sun, 0145° / 29°0Clear
45 °Clear

Alton, Sunday, 1 November

Clear. High 45°, low 29°.

Pressure30.27 inHg
Wind17.7 mph NW
Humidity63%
Visibility—
Dew point27°
Mon, 0258° / 38°0Overcast
58 °Overcast

Alton, Monday, 2 November

Overcast. High 58°, low 38°.

Pressure29.97 inHg
Wind21.5 mph S
Humidity51%
Visibility—
Dew point36°

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.