As of 00:43 MDT

Weather in Alton, ID

57°

Alton, Sunday, 11 October, 00:43

Overcast. Feels like 56°. High 59°, low 49°.

Pressure29.62 inHg

Wind3.3 mph E

Humidity78%

Visibility6.2 mi

Dew point50°

See detailed hourly forecast

Monthly outlook for Alton, ID: average high 58.9°, average low 41.5°. That is 3.1° above the climate normal for October. Precipitation is expected on 4 days (about 1.1 inches), against a normal of 4 days and 0.9 inches. The warmest day looks like 21 October (65°), the coolest 15 October (32.6°).

58.9°/41.5°

Average high / low

+3.1°

Above normal

4 / 4

Wet days / normal

1.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
11 October – 20 October	56.8°	54.7°	+1.2°
21 October – 30 October	62.5°	49.4°	+7.2°
31 October – 9 November	at normal	43.6°	—

October records over 66 years

79.5°1 October 2010All-time high

-16.4°30 October 2019All-time low

Climate normals and records are computed from the nearest reference point — Marse (10 mi).

Mon, 1254° / 43°

0.24

54 °

Alton, Monday, 12 October

Rain. High 54°, low 43°.

Pressure29.77 inHg

Wind9.5 mph SE

Humidity66%

Visibility6.2 mi

Dew point42°

Tue, 1346° / 36°

0.17

46 °

Alton, Tuesday, 13 October

Light rain. High 46°, low 36°.

Pressure29.88 inHg

Wind4.1 mph SW

Humidity81%

Visibility5.3 mi

Dew point41°

Wed, 1446° / 39°

0.26

46 °

Alton, Wednesday, 14 October

Light rain. High 46°, low 39°.

Pressure30.12 inHg

Wind2.8 mph N

Humidity91%

Visibility6.2 mi

Dew point40°

Thu, 1552° / 33°

0.02

52 °

Alton, Thursday, 15 October

Light rain. High 52°, low 33°.

Pressure30.36 inHg

Wind4.8 mph S

Humidity69%

Visibility—

Dew point36°

Fri, 1658° / 40°

58 °

Alton, Friday, 16 October

Partly cloudy. High 58°, low 40°.

Pressure30.42 inHg

Wind11.1 mph SE

Humidity56%

Visibility—

Dew point35°

Sat, 1762° / 40°

62 °

Alton, Saturday, 17 October

Clear. High 62°, low 40°.

Pressure30.33 inHg

Wind7 mph W

Humidity40%

Visibility—

Dew point28°

Sun, 1863° / 41°

63 °

Alton, Sunday, 18 October

Clear. High 63°, low 41°.

Pressure30.24 inHg

Wind6.8 mph W

Humidity42%

Visibility—

Dew point31°

Mon, 1963° / 43°

63 °

Alton, Monday, 19 October

Clear. High 63°, low 43°.

Pressure30.21 inHg

Wind6.5 mph W

Humidity37%

Visibility—

Dew point29°

Tue, 2064° / 43°

64 °

Alton, Tuesday, 20 October

Clear. High 64°, low 43°.

Pressure30.09 inHg

Wind14.7 mph W

Humidity33%

Visibility—

Dew point26°

Wed, 2165° / 42°

65 °

Alton, Wednesday, 21 October

Clear. High 65°, low 42°.

Pressure30.12 inHg

Wind10 mph W

Humidity32%

Visibility—

Dew point25°

Thu, 2265° / 43°

65 °

Alton, Thursday, 22 October

Clear. High 65°, low 43°.

Pressure30.18 inHg

Wind5.2 mph W

Humidity29%

Visibility—

Dew point24°

Fri, 2364° / 44°

64 °

Alton, Friday, 23 October

Clear. High 64°, low 44°.

Pressure30.15 inHg

Wind6.7 mph NW

Humidity29%

Visibility—

Dew point24°

Sat, 2464° / 45°

64 °

Alton, Saturday, 24 October

Clear. High 64°, low 45°.

Pressure30.09 inHg

Wind6.8 mph W

Humidity32%

Visibility—

Dew point27°

Sun, 2562° / 42°

62 °

Alton, Sunday, 25 October

Clear. High 62°, low 42°.

Pressure30.06 inHg

Wind6.4 mph NW

Humidity29%

Visibility—

Dew point23°

Mon, 2654° / 41°

54 °

Alton, Monday, 26 October

Overcast. High 54°, low 41°.

Pressure30.03 inHg

Wind2.9 mph E

Humidity28%

Visibility—

Dew point20°

From day 17 onward the outlook is built from 60-year climate statistics

Tue, 2749° / 30°

0.04

49 °

Alton, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high49°

Average low30°

Average precipitation0.04 in

Chance of precipitation22%

Record high65° (2024)

Record low1° (1996)

Wed, 2848° / 29°

0.06

48 °

Alton, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high48°

Average low29°

Average precipitation0.06 in

Chance of precipitation28%

Record high64° (2018)

Record low-1° (2019)

Thu, 2946° / 29°

0.06

46 °

Alton, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high46°

Average low29°

Average precipitation0.06 in

Chance of precipitation33%

Record high66° (1962)

Record low2° (1971)

Fri, 3045° / 28°

0.07

45 °

Alton, Friday, 30 October

Climate normal for this date — 60-year average.

Average high45°

Average low28°

Average precipitation0.07 in

Chance of precipitation30%

Record high67° (1962)

Record low-16° (2019)

Sat, 3144° / 27°

0.07

44 °

Alton, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high44°

Average low27°

Average precipitation0.07 in

Chance of precipitation32%

Record high62° (2014)

Record low-5° (2019)

Sun, 0144° / 26°

0.05

44 °

Alton, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high44°

Average low26°

Average precipitation0.05 in

Chance of precipitation25%

Record high62° (1988)

Record low1° (2004)

Mon, 0244° / 26°

0.05

44 °

Alton, Monday, 2 November

Climate normal for this date — 60-year average.

Average high44°

Average low26°

Average precipitation0.05 in

Chance of precipitation27%

Record high60° (2020)

Record low3° (1970)

Tue, 0344° / 25°

0.04

44 °

Alton, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high44°

Average low25°

Average precipitation0.04 in

Chance of precipitation15%

Record high62° (2020)

Record low-7° (1991)

Wed, 0444° / 26°

0.04

44 °

Alton, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high44°

Average low26°

Average precipitation0.04 in

Chance of precipitation18%

Record high62° (2020)

Record low3° (1970)

Thu, 0544° / 26°

0.05

44 °

Alton, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high44°

Average low26°

Average precipitation0.05 in

Chance of precipitation28%

Record high62° (2020)

Record low-8° (1961)

Fri, 0644° / 26°

0.05

44 °

Alton, Friday, 6 November

Climate normal for this date — 60-year average.

Average high44°

Average low26°

Average precipitation0.05 in

Chance of precipitation27%

Record high65° (2020)

Record low-9° (2003)

Sat, 0743° / 26°

0.08

43 °

Alton, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high43°

Average low26°

Average precipitation0.08 in

Chance of precipitation33%

Record high60° (1980)

Record low-8° (1990)

Sun, 0842° / 26°

0.08

42 °

Alton, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high42°

Average low26°

Average precipitation0.08 in

Chance of precipitation42%

Record high57° (1999)

Record low-2° (2017)

Mon, 0941° / 24°

0.08

41 °

Alton, Monday, 9 November

Climate normal for this date — 60-year average.

Average high41°

Average low24°

Average precipitation0.08 in

Chance of precipitation30%

Record high59° (2016)

Record low1° (1960)

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.