As of 14:33 MDT

Weather in Mammoth, MT

69°

Mammoth, Friday, 9 October, 14:33

Clear. Feels like 66°. High 69°, low 32°.

Pressure29.50 inHg

Wind16.5 mph SW

Humidity18%

Visibility6.2 mi

Dew point25°

See detailed hourly forecast

Monthly outlook for Mammoth, MT: average high 48.1°, average low 31.4°. That is 5.1° below the climate normal for October. Precipitation is expected on 3 days (about 2.4 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 9 October (68.9°), the coolest 11 October (20°).

48.1°/31.4°

Average high / low

−5.1°

Below normal

3 / 4

Wet days / normal

2.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 October – 18 October	45.2°	57.8°	-7°
19 October – 28 October	52.8°	54.7°	-1.1°
29 October – 7 November	at normal	47.4°	—

October records over 66 years

86°3 October 2010All-time high

-11.4°31 October 1996All-time low

Climate normals and records are computed from the nearest reference point — Cardwell (14 mi).

Sat, 1045° / 24°

0.63

45 °

Mammoth, Saturday, 10 October

Snow. High 45°, low 24°.

Pressure29.59 inHg

Wind4.7 mph N

Humidity65%

Visibility6.2 mi

Dew point39°

Sun, 1133° / 20°

1.25

33 °

Mammoth, Sunday, 11 October

Snow. High 33°, low 20°.

Pressure29.97 inHg

Wind5.2 mph NE

Humidity96%

Visibility1.1 mi

Dew point30°

Mon, 1233° / 25°

0.48

33 °

Mammoth, Monday, 12 October

Snow. High 33°, low 25°.

Pressure30.12 inHg

Wind2.7 mph NE

Humidity95%

Visibility6.2 mi

Dew point26°

Tue, 1338° / 24°

38 °

Mammoth, Tuesday, 13 October

Clear. High 38°, low 24°.

Pressure30.12 inHg

Wind1.4 mph N

Humidity80%

Visibility6.2 mi

Dew point28°

Wed, 1443° / 27°

43 °

Mammoth, Wednesday, 14 October

Overcast. High 43°, low 27°.

Pressure30.15 inHg

Wind2.8 mph S

Humidity71%

Visibility—

Dew point30°

Thu, 1542° / 30°

42 °

Mammoth, Thursday, 15 October

Partly cloudy. High 42°, low 30°.

Pressure30.30 inHg

Wind3.8 mph SW

Humidity70%

Visibility—

Dew point29°

Fri, 1642° / 25°

42 °

Mammoth, Friday, 16 October

Partly cloudy. High 42°, low 25°.

Pressure30.53 inHg

Wind5.4 mph S

Humidity70%

Visibility—

Dew point26°

Sat, 1752° / 34°

52 °

Mammoth, Saturday, 17 October

Overcast. High 52°, low 34°.

Pressure30.21 inHg

Wind9 mph SW

Humidity38%

Visibility—

Dew point22°

Sun, 1855° / 38°

55 °

Mammoth, Sunday, 18 October

Overcast. High 55°, low 38°.

Pressure30.15 inHg

Wind8 mph SW

Humidity35%

Visibility—

Dew point22°

Mon, 1959° / 41°

59 °

Mammoth, Monday, 19 October

Clear. High 59°, low 41°.

Pressure30.03 inHg

Wind9.1 mph SW

Humidity29%

Visibility—

Dew point21°

Tue, 2058° / 42°

58 °

Mammoth, Tuesday, 20 October

Clear. High 58°, low 42°.

Pressure30.00 inHg

Wind11.9 mph SW

Humidity29%

Visibility—

Dew point22°

Wed, 2156° / 38°

56 °

Mammoth, Wednesday, 21 October

Clear. High 56°, low 38°.

Pressure30.12 inHg

Wind4.2 mph SW

Humidity36%

Visibility—

Dew point24°

Thu, 2256° / 40°

56 °

Mammoth, Thursday, 22 October

Partly cloudy. High 56°, low 40°.

Pressure29.71 inHg

Wind17.8 mph SW

Humidity35%

Visibility—

Dew point26°

Fri, 2343° / 33°

43 °

Mammoth, Friday, 23 October

Overcast. High 43°, low 33°.

Pressure29.91 inHg

Wind7.7 mph SW

Humidity53%

Visibility—

Dew point23°

Sat, 2445° / 29°

45 °

Mammoth, Saturday, 24 October

Partly cloudy. High 45°, low 29°.

Pressure30.00 inHg

Wind4 mph NE

Humidity56%

Visibility—

Dew point25°

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

Sun, 2554° / 33°

0.04

54 °

Mammoth, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high54°

Average low33°

Average precipitation0.04 in

Chance of precipitation22%

Record high69° (1979)

Record low3° (2020)

Mon, 2653° / 32°

0.07

53 °

Mammoth, Monday, 26 October

Climate normal for this date — 60-year average.

Average high53°

Average low32°

Average precipitation0.07 in

Chance of precipitation35%

Record high69° (1999)

Record low3° (2020)

Tue, 2752° / 31°

0.03

52 °

Mammoth, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high52°

Average low31°

Average precipitation0.03 in

Chance of precipitation20%

Record high68° (1987)

Record low6° (2023)

Wed, 2851° / 31°

0.06

51 °

Mammoth, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high51°

Average low31°

Average precipitation0.06 in

Chance of precipitation33%

Record high69° (1987)

Record low4° (1991)

Thu, 2949° / 29°

0.06

49 °

Mammoth, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high49°

Average low29°

Average precipitation0.06 in

Chance of precipitation27%

Record high70° (1964)

Record low-7° (1991)

Fri, 3048° / 29°

0.04

48 °

Mammoth, Friday, 30 October

Climate normal for this date — 60-year average.

Average high48°

Average low29°

Average precipitation0.04 in

Chance of precipitation28%

Record high68° (1962)

Record low-11° (1991)

Sat, 3148° / 28°

0.05

48 °

Mammoth, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high48°

Average low28°

Average precipitation0.05 in

Chance of precipitation23%

Record high67° (1988)

Record low-11° (1996)

Sun, 0148° / 29°

0.04

48 °

Mammoth, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high48°

Average low29°

Average precipitation0.04 in

Chance of precipitation23%

Record high67° (2025)

Record low-12° (2002)

Mon, 0247° / 29°

0.03

47 °

Mammoth, Monday, 2 November

Climate normal for this date — 60-year average.

Average high47°

Average low29°

Average precipitation0.03 in

Chance of precipitation20%

Record high64° (1965)

Record low-19° (1991)

Tue, 0347° / 28°

0.04

47 °

Mammoth, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high47°

Average low28°

Average precipitation0.04 in

Chance of precipitation18%

Record high65° (1962)

Record low-13° (1991)

Wed, 0448° / 29°

0.04

48 °

Mammoth, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high48°

Average low29°

Average precipitation0.04 in

Chance of precipitation27%

Record high64° (1962)

Record low-11° (1973)

Thu, 0547° / 29°

0.04

47 °

Mammoth, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high47°

Average low29°

Average precipitation0.04 in

Chance of precipitation27%

Record high67° (2020)

Record low-5° (2003)

Fri, 0646° / 28°

0.04

46 °

Mammoth, Friday, 6 November

Climate normal for this date — 60-year average.

Average high46°

Average low28°

Average precipitation0.04 in

Chance of precipitation32%

Record high66° (1999)

Record low6° (2017)

Sat, 0745° / 27°

0.04

45 °

Mammoth, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high45°

Average low27°

Average precipitation0.04 in

Chance of precipitation25%

Record high64° (2010)

Record low2° (2000)

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 Mammoth, MT 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 Mammoth, MT 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.