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As of 15:56 MDT

Weather in Alton, ID

93°Current weather

Alton, Saturday, 8 August, 15:56

Overcast. Feels like 88°. High 93°, low 59°.

Pressure29.77 inHg
Wind15.2 mph W
Humidity13%
Visibility6.2 mi
Dew point35°
Sun, 0991° / 58°0.02Light rain
91 °Light rain

Alton, Sunday, 9 August

Light rain. High 91°, low 58°.

Pressure29.83 inHg
Wind8.8 mph W
Humidity15%
Visibility6.2 mi
Dew point35°
Mon, 1093° / 55°0Clear
93 °Clear

Alton, Monday, 10 August

Clear. High 93°, low 55°.

Pressure29.83 inHg
Wind9.3 mph W
Humidity16%
Visibility6.2 mi
Dew point35°
Tue, 1193° / 59°0Clear
93 °Clear

Alton, Tuesday, 11 August

Clear. High 93°, low 59°.

Pressure29.88 inHg
Wind7.4 mph W
Humidity10%
Visibility6.2 mi
Dew point24°
Wed, 1287° / 63°0Overcast
87 °Overcast

Alton, Wednesday, 12 August

Overcast. High 87°, low 63°.

Pressure29.83 inHg
Wind10.1 mph NW
Humidity16%
Visibility6.2 mi
Dew point34°
Thu, 1389° / 57°0Clear
89 °Clear

Alton, Thursday, 13 August

Clear. High 89°, low 57°.

Pressure29.80 inHg
Wind15.7 mph SW
Humidity19%
Visibility—
Dew point33°
Fri, 1487° / 60°0Light rain
87 °Light rain

Alton, Friday, 14 August

Light rain. High 87°, low 60°.

Pressure29.88 inHg
Wind15.6 mph W
Humidity27%
Visibility—
Dew point42°
Sat, 1587° / 60°0.02Light rain
87 °Light rain

Alton, Saturday, 15 August

Light rain. High 87°, low 60°.

Pressure29.97 inHg
Wind22.6 mph W
Humidity32%
Visibility—
Dew point45°
Sun, 1688° / 57°0Mostly clear
88 °Mostly clear

Alton, Sunday, 16 August

Mostly clear. High 88°, low 57°.

Pressure30.03 inHg
Wind18.9 mph W
Humidity22%
Visibility—
Dew point37°
Mon, 1787° / 60°0Partly cloudy
87 °Partly cloudy

Alton, Monday, 17 August

Partly cloudy. High 87°, low 60°.

Pressure30.00 inHg
Wind7.3 mph SE
Humidity17%
Visibility—
Dew point33°
Tue, 1889° / 59°0Overcast
89 °Overcast

Alton, Tuesday, 18 August

Overcast. High 89°, low 59°.

Pressure29.94 inHg
Wind22.1 mph NW
Humidity20%
Visibility—
Dew point37°
Wed, 1988° / 56°0Partly cloudy
88 °Partly cloudy

Alton, Wednesday, 19 August

Partly cloudy. High 88°, low 56°.

Pressure29.97 inHg
Wind16.8 mph W
Humidity23%
Visibility—
Dew point37°
Thu, 2089° / 57°0Clear
89 °Clear

Alton, Thursday, 20 August

Clear. High 89°, low 57°.

Pressure29.94 inHg
Wind15.1 mph W
Humidity26%
Visibility—
Dew point40°
Fri, 2191° / 60°0.01Light rain
91 °Light rain

Alton, Friday, 21 August

Light rain. High 91°, low 60°.

Pressure29.91 inHg
Wind17 mph NW
Humidity22%
Visibility—
Dew point39°
Sat, 2290° / 58°0Overcast
90 °Overcast

Alton, Saturday, 22 August

Overcast. High 90°, low 58°.

Pressure29.94 inHg
Wind7.7 mph W
Humidity23%
Visibility—
Dew point39°
Sun, 2389° / 62°0.01Light rain
89 °Light rain

Alton, Sunday, 23 August

Light rain. High 89°, low 62°.

Pressure29.91 inHg
Wind11.7 mph W
Humidity18%
Visibility—
Dew point35°

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, ID 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, ID 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.