As of 13:54 CDT

Weather in Alton, IA

49°

Alton, Friday, 16 October, 13:54

Clear. Feels like 44°. High 49°, low 37°.

Pressure30.56 inHg

Wind14.7 mph N

Humidity60%

Visibility6.2 mi

Dew point36°

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°.

Pressure30.21 inHg

Wind10.4 mph SE

Humidity61%

Visibility6.2 mi

Dew point46°

Wed, 2169° / 52°

0.14

69 °

Alton, Wednesday, 21 October

Rain. High 69°, low 52°.

Pressure30.12 inHg

Wind11.3 mph S

Humidity60%

Visibility—

Dew point49°

Thu, 2267° / 52°

67 °

Alton, Thursday, 22 October

Clear. High 67°, low 52°.

Pressure30.15 inHg

Wind11.7 mph NE

Humidity42%

Visibility—

Dew point40°

Fri, 2367° / 48°

0.01

67 °

Alton, Friday, 23 October

Light rain. High 67°, low 48°.

Pressure30.09 inHg

Wind19.5 mph SE

Humidity60%

Visibility—

Dew point47°

Sat, 2469° / 58°

0.04

69 °

Alton, Saturday, 24 October

Light rain. High 69°, low 58°.

Pressure30.03 inHg

Wind16.8 mph S

Humidity58%

Visibility—

Dew point53°

Sun, 2553° / 42°

0.72

53 °

Alton, Sunday, 25 October

Rain. High 53°, low 42°.

Pressure30.21 inHg

Wind21.5 mph NE

Humidity92%

Visibility—

Dew point42°

Mon, 2646° / 38°

0.29

46 °

Alton, Monday, 26 October

Rain. High 46°, low 38°.

Pressure30.15 inHg

Wind16.4 mph NE

Humidity89%

Visibility—

Dew point37°

Tue, 2746° / 34°

0.07

46 °

Alton, Tuesday, 27 October

Light rain. High 46°, low 34°.

Pressure30.21 inHg

Wind8.3 mph S

Humidity64%

Visibility—

Dew point31°

Wed, 2858° / 43°

1.28

58 °

Alton, Wednesday, 28 October

Rain. High 58°, low 43°.

Pressure29.83 inHg

Wind19.4 mph S

Humidity97%

Visibility—

Dew point49°

Thu, 2957° / 45°

57 °

Alton, Thursday, 29 October

Clear. High 57°, low 45°.

Pressure29.88 inHg

Wind14.8 mph W

Humidity67%

Visibility—

Dew point44°

Fri, 3053° / 42°

53 °

Alton, Friday, 30 October

Overcast. High 53°, low 42°.

Pressure30.21 inHg

Wind10.2 mph NE

Humidity69%

Visibility—

Dew point40°

Sat, 3147° / 45°

0.39

47 °

Alton, Saturday, 31 October

Rain. High 47°, low 45°.

Pressure30.12 inHg

Wind24.1 mph E

Humidity85%

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.