As of 08:08 CDT

Weather in Alton, IA

42°

Alton, Friday, 16 October, 08:08

Overcast. Feels like 33°. High 49°, low 37°.

Pressure30.47 inHg

Wind21.2 mph NW

Humidity77%

Visibility6.2 mi

Dew point35°

See detailed hourly forecast

Sat, 1757° / 34°

57 °

Alton, Saturday, 17 October

Clear. High 57°, low 34°.

Pressure30.42 inHg

Wind14.6 mph S

Humidity46%

Visibility6.2 mi

Dew point31°

Sun, 1863° / 42°

63 °

Alton, Sunday, 18 October

Clear. High 63°, low 42°.

Pressure30.21 inHg

Wind14 mph S

Humidity55%

Visibility6.2 mi

Dew point39°

Mon, 1961° / 45°

61 °

Alton, Monday, 19 October

Overcast. High 61°, low 45°.

Pressure30.21 inHg

Wind10.8 mph S

Humidity68%

Visibility6.2 mi

Dew point46°

Tue, 2067° / 46°

67 °

Alton, Tuesday, 20 October

Clear. High 67°, low 46°.

Pressure30.18 inHg

Wind13.4 mph SE

Humidity55%

Visibility—

Dew point45°

Wed, 2169° / 54°

69 °

Alton, Wednesday, 21 October

Clear. High 69°, low 54°.

Pressure30.12 inHg

Wind12.7 mph S

Humidity57%

Visibility—

Dew point49°

Thu, 2272° / 56°

72 °

Alton, Thursday, 22 October

Clear. High 72°, low 56°.

Pressure30.12 inHg

Wind8.1 mph NE

Humidity49%

Visibility—

Dew point48°

Fri, 2378° / 58°

78 °

Alton, Friday, 23 October

Clear. High 78°, low 58°.

Pressure29.94 inHg

Wind21.1 mph S

Humidity64%

Visibility—

Dew point59°

Sat, 2472° / 52°

0.01

72 °

Alton, Saturday, 24 October

Light rain. High 72°, low 52°.

Pressure29.88 inHg

Wind20.7 mph S

Humidity52%

Visibility—

Dew point48°

Sun, 2549° / 43°

0.69

49 °

Alton, Sunday, 25 October

Rain. High 49°, low 43°.

Pressure30.30 inHg

Wind11.9 mph NW

Humidity70%

Visibility—

Dew point37°

Mon, 2654° / 45°

1.53

54 °

Alton, Monday, 26 October

Heavy rain. High 54°, low 45°.

Pressure29.74 inHg

Wind16.6 mph NW

Humidity98%

Visibility—

Dew point51°

Tue, 2758° / 40°

0.03

58 °

Alton, Tuesday, 27 October

Light rain. High 58°, low 40°.

Pressure29.85 inHg

Wind16.2 mph NW

Humidity56%

Visibility—

Dew point37°

Wed, 2862° / 46°

0.01

62 °

Alton, Wednesday, 28 October

Light rain. High 62°, low 46°.

Pressure29.80 inHg

Wind14.9 mph SE

Humidity60%

Visibility—

Dew point44°

Thu, 2960° / 53°

0.14

60 °

Alton, Thursday, 29 October

Light rain. High 60°, low 53°.

Pressure29.65 inHg

Wind15.9 mph S

Humidity93%

Visibility—

Dew point56°

Fri, 3051° / 36°

0.07

51 °

Alton, Friday, 30 October

Light rain. High 51°, low 36°.

Pressure29.71 inHg

Wind21.7 mph NW

Humidity78%

Visibility—

Dew point34°

Sat, 3150° / 32°

50 °

Alton, Saturday, 31 October

Clear. High 50°, low 32°.

Pressure29.97 inHg

Wind9.1 mph NW

Humidity52%

Visibility—

Dew point27°

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.