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As of 14:20 CDT

Weather in Alton, IA

78°Current weather

Alton, Saturday, 8 August, 14:20

Clear. Feels like 78°. High 83°, low 56°.

Pressure29.97 inHg
Wind10.3 mph S
Humidity51%
Visibility6.2 mi
Dew point58°
Sun, 0984° / 69°0.19Rain
84 °Rain

Alton, Sunday, 9 August

Rain. High 84°, low 69°.

Pressure29.74 inHg
Wind8.3 mph N
Humidity41%
Visibility6.2 mi
Dew point65°
Mon, 10103° / 66°0.09Rain
103 °Rain

Alton, Monday, 10 August

Rain. High 103°, low 66°.

Pressure29.80 inHg
Wind4.8 mph E
Humidity42%
Visibility6.2 mi
Dew point63°
Tue, 1197° / 68°0Clear
97 °Clear

Alton, Tuesday, 11 August

Clear. High 97°, low 68°.

Pressure29.77 inHg
Wind10.8 mph NE
Humidity41%
Visibility6.2 mi
Dew point64°
Wed, 1299° / 66°0.03Light rain
99 °Light rain

Alton, Wednesday, 12 August

Light rain. High 99°, low 66°.

Pressure29.83 inHg
Wind9.1 mph SE
Humidity32%
Visibility6.2 mi
Dew point58°
Thu, 1386° / 61°0.06Light rain
86 °Light rain

Alton, Thursday, 13 August

Light rain. High 86°, low 61°.

Pressure29.97 inHg
Wind15.1 mph E
Humidity29%
Visibility—
Dew point45°
Fri, 1489° / 57°0Clear
89 °Clear

Alton, Friday, 14 August

Clear. High 89°, low 57°.

Pressure30.15 inHg
Wind13.4 mph S
Humidity23%
Visibility—
Dew point40°
Sat, 1589° / 59°0Overcast
89 °Overcast

Alton, Saturday, 15 August

Overcast. High 89°, low 59°.

Pressure30.12 inHg
Wind15.9 mph S
Humidity31%
Visibility—
Dew point49°
Sun, 1698° / 68°0.06Light rain
98 °Light rain

Alton, Sunday, 16 August

Light rain. High 98°, low 68°.

Pressure29.94 inHg
Wind10.9 mph S
Humidity40%
Visibility—
Dew point62°
Mon, 1794° / 69°0.1Light rain
94 °Light rain

Alton, Monday, 17 August

Light rain. High 94°, low 69°.

Pressure29.97 inHg
Wind13.7 mph NE
Humidity41%
Visibility—
Dew point61°
Tue, 18100° / 68°0Overcast
100 °Overcast

Alton, Tuesday, 18 August

Overcast. High 100°, low 68°.

Pressure29.94 inHg
Wind9.3 mph NW
Humidity34%
Visibility—
Dew point58°
Wed, 1995° / 67°0.01Light rain
95 °Light rain

Alton, Wednesday, 19 August

Light rain. High 95°, low 67°.

Pressure29.85 inHg
Wind21 mph NE
Humidity30%
Visibility—
Dew point53°
Thu, 2090° / 61°0Clear
90 °Clear

Alton, Thursday, 20 August

Clear. High 90°, low 61°.

Pressure29.97 inHg
Wind10 mph NE
Humidity30%
Visibility—
Dew point48°
Fri, 2196° / 64°0Clear
96 °Clear

Alton, Friday, 21 August

Clear. High 96°, low 64°.

Pressure29.91 inHg
Wind9.9 mph S
Humidity26%
Visibility—
Dew point49°
Sat, 2280° / 61°0.02Light rain
80 °Light rain

Alton, Saturday, 22 August

Light rain. High 80°, low 61°.

Pressure30.06 inHg
Wind18.1 mph NE
Humidity58%
Visibility—
Dew point55°
Sun, 2382° / 48°0Clear
82 °Clear

Alton, Sunday, 23 August

Clear. High 82°, low 48°.

Pressure30.18 inHg
Wind10.9 mph SE
Humidity21%
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.