As of 11:41 CDT

Weather in Alton, IA

52°

Alton, Tuesday, 13 October, 11:41

Partly cloudy. Feels like 51°. High 57°, low 48°.

Pressure29.97 inHg

Wind5 mph N

Humidity73%

Visibility6.2 mi

Dew point44°

See detailed hourly forecast

Wed, 1460° / 42°

60 °

Alton, Wednesday, 14 October

Clear. High 60°, low 42°.

Pressure30.21 inHg

Wind7.7 mph NE

Humidity59%

Visibility6.2 mi

Dew point42°

Thu, 1555° / 48°

0.81

55 °

Alton, Thursday, 15 October

Rain. High 55°, low 48°.

Pressure30.09 inHg

Wind12 mph N

Humidity93%

Visibility1.7 mi

Dew point48°

Fri, 1653° / 41°

53 °

Alton, Friday, 16 October

Clear. High 53°, low 41°.

Pressure30.59 inHg

Wind15.6 mph N

Humidity52%

Visibility6.2 mi

Dew point31°

Sat, 1760° / 36°

60 °

Alton, Saturday, 17 October

Clear. High 60°, low 36°.

Pressure30.30 inHg

Wind17.4 mph S

Humidity45%

Visibility—

Dew point33°

Sun, 1859° / 46°

59 °

Alton, Sunday, 18 October

Overcast. High 59°, low 46°.

Pressure30.03 inHg

Wind15.1 mph S

Humidity53%

Visibility—

Dew point40°

Mon, 1963° / 46°

63 °

Alton, Monday, 19 October

Mostly clear. High 63°, low 46°.

Pressure30.21 inHg

Wind7.8 mph SE

Humidity27%

Visibility—

Dew point25°

Tue, 2060° / 44°

60 °

Alton, Tuesday, 20 October

Overcast. High 60°, low 44°.

Pressure30.09 inHg

Wind15.1 mph SE

Humidity89%

Visibility—

Dew point51°

Wed, 2167° / 56°

0.06

67 °

Alton, Wednesday, 21 October

Light rain. High 67°, low 56°.

Pressure29.91 inHg

Wind16.6 mph S

Humidity83%

Visibility—

Dew point60°

Thu, 2272° / 65°

0.45

72 °

Alton, Thursday, 22 October

Rain. High 72°, low 65°.

Pressure29.74 inHg

Wind15.9 mph S

Humidity82%

Visibility—

Dew point65°

Fri, 2364° / 44°

0.57

64 °

Alton, Friday, 23 October

Rain. High 64°, low 44°.

Pressure29.88 inHg

Wind21.9 mph W

Humidity69%

Visibility—

Dew point40°

Sat, 2456° / 42°

56 °

Alton, Saturday, 24 October

Clear. High 56°, low 42°.

Pressure30.36 inHg

Wind13.1 mph W

Humidity51%

Visibility—

Dew point35°

Sun, 2561° / 42°

61 °

Alton, Sunday, 25 October

Clear. High 61°, low 42°.

Pressure30.18 inHg

Wind15.8 mph W

Humidity37%

Visibility—

Dew point31°

Mon, 2649° / 38°

49 °

Alton, Monday, 26 October

Clear. High 49°, low 38°.

Pressure30.39 inHg

Wind11.8 mph N

Humidity53%

Visibility—

Dew point29°

Tue, 2748° / 39°

0.07

48 °

Alton, Tuesday, 27 October

Light rain. High 48°, low 39°.

Pressure30.09 inHg

Wind17.9 mph S

Humidity62%

Visibility—

Dew point35°

Wed, 2851° / 43°

51 °

Alton, Wednesday, 28 October

Overcast. High 51°, low 43°.

Pressure29.88 inHg

Wind16.7 mph NW

Humidity69%

Visibility—

Dew point41°

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.