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As of 17:16 EDT

Weather in Alton, IN

89°Current weather

Alton, Saturday, 8 August, 17:16

Overcast. Feels like 99°. High 89°, low 73°.

Pressure30.00 inHg
Wind7.4 mph W
Humidity65%
Visibility6.2 mi
Dew point75°
Sun, 0992° / 75°0Clear
92 °Clear

Alton, Sunday, 9 August

Clear. High 92°, low 75°.

Pressure30.06 inHg
Wind6.9 mph S
Humidity59%
Visibility6.2 mi
Dew point71°
Mon, 1093° / 75°0Clear
93 °Clear

Alton, Monday, 10 August

Clear. High 93°, low 75°.

Pressure30.06 inHg
Wind10.4 mph SW
Humidity56%
Visibility6.2 mi
Dew point70°
Tue, 1195° / 72°0.01Light rain
95 °Light rain

Alton, Tuesday, 11 August

Light rain. High 95°, low 72°.

Pressure29.97 inHg
Wind11.1 mph SW
Humidity54%
Visibility6.2 mi
Dew point70°
Wed, 1293° / 69°0.16Rain
93 °Rain

Alton, Wednesday, 12 August

Rain. High 93°, low 69°.

Pressure29.83 inHg
Wind8.1 mph W
Humidity55%
Visibility6.2 mi
Dew point70°
Thu, 1382° / 70°0.5Rain
82 °Rain

Alton, Thursday, 13 August

Rain. High 82°, low 70°.

Pressure29.88 inHg
Wind8.1 mph W
Humidity94%
Visibility—
Dew point73°
Fri, 1480° / 64°0.25Rain
80 °Rain

Alton, Friday, 14 August

Rain. High 80°, low 64°.

Pressure30.06 inHg
Wind9.6 mph NE
Humidity46%
Visibility—
Dew point56°
Sat, 1580° / 55°0Mostly clear
80 °Mostly clear

Alton, Saturday, 15 August

Mostly clear. High 80°, low 55°.

Pressure30.27 inHg
Wind6.3 mph NE
Humidity41%
Visibility—
Dew point50°
Sun, 1683° / 57°0Overcast
83 °Overcast

Alton, Sunday, 16 August

Overcast. High 83°, low 57°.

Pressure30.21 inHg
Wind6.4 mph E
Humidity37%
Visibility—
Dew point50°
Mon, 1780° / 65°0.04Light rain
80 °Light rain

Alton, Monday, 17 August

Light rain. High 80°, low 65°.

Pressure30.06 inHg
Wind8.8 mph SW
Humidity74%
Visibility—
Dew point69°
Tue, 1883° / 71°0.17Rain
83 °Rain

Alton, Tuesday, 18 August

Rain. High 83°, low 71°.

Pressure29.94 inHg
Wind7.7 mph SW
Humidity72%
Visibility—
Dew point71°
Wed, 1991° / 69°0Partly cloudy
91 °Partly cloudy

Alton, Wednesday, 19 August

Partly cloudy. High 91°, low 69°.

Pressure29.94 inHg
Wind5.2 mph E
Humidity50%
Visibility—
Dew point65°
Thu, 2077° / 70°0.62Rain
77 °Rain

Alton, Thursday, 20 August

Rain. High 77°, low 70°.

Pressure29.88 inHg
Wind4.5 mph SE
Humidity98%
Visibility—
Dew point72°
Fri, 2181° / 67°0.29Rain
81 °Rain

Alton, Friday, 21 August

Rain. High 81°, low 67°.

Pressure29.88 inHg
Wind4.8 mph NE
Humidity88%
Visibility—
Dew point73°
Sat, 2287° / 64°0Overcast
87 °Overcast

Alton, Saturday, 22 August

Overcast. High 87°, low 64°.

Pressure29.91 inHg
Wind4.9 mph N
Humidity43%
Visibility—
Dew point58°
Sun, 2377° / 59°0Overcast
77 °Overcast

Alton, Sunday, 23 August

Overcast. High 77°, low 59°.

Pressure30.09 inHg
Wind11.3 mph E
Humidity49%
Visibility—
Dew point54°

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, IN 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, IN 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.