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As of 20:23 CDT

Weather in Alton, MO

82°Current weather

Alton, Saturday, 8 August, 20:23

Clear. Feels like 88°. High 89°, low 70°.

Pressure30.00 inHg
Wind7.1 mph S
Humidity77%
Visibility6.2 mi
Dew point74°
Sun, 0994° / 70°0Clear
94 °Clear

Alton, Sunday, 9 August

Clear. High 94°, low 70°.

Pressure30.03 inHg
Wind7.5 mph S
Humidity46%
Visibility6.2 mi
Dew point68°
Mon, 10100° / 72°0Clear
100 °Clear

Alton, Monday, 10 August

Clear. High 100°, low 72°.

Pressure30.00 inHg
Wind8.5 mph SW
Humidity39%
Visibility6.2 mi
Dew point66°
Tue, 11104° / 74°0Light rain
104 °Light rain

Alton, Tuesday, 11 August

Light rain. High 104°, low 74°.

Pressure29.91 inHg
Wind11.3 mph SW
Humidity36%
Visibility6.2 mi
Dew point66°
Wed, 1297° / 73°0.07Light rain
97 °Light rain

Alton, Wednesday, 12 August

Light rain. High 97°, low 73°.

Pressure29.85 inHg
Wind11.1 mph W
Humidity37%
Visibility6.2 mi
Dew point65°
Thu, 13100° / 72°0Overcast
100 °Overcast

Alton, Thursday, 13 August

Overcast. High 100°, low 72°.

Pressure29.88 inHg
Wind10.7 mph S
Humidity42%
Visibility—
Dew point65°
Fri, 14103° / 73°0.02Light rain
103 °Light rain

Alton, Friday, 14 August

Light rain. High 103°, low 73°.

Pressure29.94 inHg
Wind11.5 mph NE
Humidity32%
Visibility—
Dew point59°
Sat, 1599° / 72°0Overcast
99 °Overcast

Alton, Saturday, 15 August

Overcast. High 99°, low 72°.

Pressure30.12 inHg
Wind11.8 mph E
Humidity55%
Visibility—
Dew point67°
Sun, 16105° / 76°0Mostly clear
105 °Mostly clear

Alton, Sunday, 16 August

Mostly clear. High 105°, low 76°.

Pressure30.00 inHg
Wind8.9 mph W
Humidity23%
Visibility—
Dew point56°
Mon, 17102° / 72°0.36Rain
102 °Rain

Alton, Monday, 17 August

Rain. High 102°, low 72°.

Pressure30.00 inHg
Wind8.5 mph NE
Humidity39%
Visibility—
Dew point63°
Tue, 1893° / 72°0Overcast
93 °Overcast

Alton, Tuesday, 18 August

Overcast. High 93°, low 72°.

Pressure29.97 inHg
Wind8.4 mph SE
Humidity45%
Visibility—
Dew point64°
Wed, 19106° / 72°0Partly cloudy
106 °Partly cloudy

Alton, Wednesday, 19 August

Partly cloudy. High 106°, low 72°.

Pressure29.85 inHg
Wind9.8 mph NE
Humidity25%
Visibility—
Dew point56°
Thu, 2091° / 67°0Clear
91 °Clear

Alton, Thursday, 20 August

Clear. High 91°, low 67°.

Pressure29.94 inHg
Wind12.8 mph E
Humidity38%
Visibility—
Dew point56°
Fri, 2192° / 63°0.08Light rain
92 °Light rain

Alton, Friday, 21 August

Light rain. High 92°, low 63°.

Pressure29.94 inHg
Wind12.3 mph E
Humidity41%
Visibility—
Dew point56°
Sat, 22108° / 65°0.06Light rain
108 °Light rain

Alton, Saturday, 22 August

Light rain. High 108°, low 65°.

Pressure29.83 inHg
Wind14.4 mph SW
Humidity24%
Visibility—
Dew point54°
Sun, 23100° / 75°0.02Light rain
100 °Light rain

Alton, Sunday, 23 August

Light rain. High 100°, low 75°.

Pressure29.94 inHg
Wind12.7 mph E
Humidity30%
Visibility—
Dew point58°

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, MO 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, MO 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.