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As of 21:59 MDT

Weather in Summit, MT

45°Current weather

Summit, Wednesday, 7 October, 21:59

Clear. Feels like 45°. High 66°, low 29°.

Pressure30.03 inHg
Wind3 mph W
Humidity41%
Visibility6.2 mi
Dew point24°

Monthly outlook for Summit, MT: average high 45°, average low 23.3°. That is 1.2° below the climate normal for October. Precipitation is expected on 5 days (about 1.5 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 9 October (69.8°), the coolest 16 October (4.4°).

45°/23.3°
Average high / low
−1.2°
Below normal
5 / 4
Wet days / normal
1.5 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
7 October – 16 October45.6°47.6°-1.1°
17 October – 26 October43.9°44.8°-0.5°
27 October – 5 Novemberat normal38.4°—

October records over 66 years

72.9°3 October 2010All-time high
-16.4°29 October 1971All-time low
Thu, 0867° / 29°0Clear
67 °Clear

Summit, Thursday, 8 October

Clear. High 67°, low 29°.

Pressure30.06 inHg
Wind3.2 mph W
Humidity27%
Visibility6.2 mi
Dew point27°
Fri, 0970° / 30°0Clear
70 °Clear

Summit, Friday, 9 October

Clear. High 70°, low 30°.

Pressure29.65 inHg
Wind13 mph SW
Humidity24%
Visibility6.2 mi
Dew point25°
Sat, 1050° / 29°0.44Rain
50 °Rain

Summit, Saturday, 10 October

Rain. High 50°, low 29°.

Pressure29.59 inHg
Wind3.8 mph NE
Humidity76%
Visibility5.4 mi
Dew point40°
Sun, 1128° / 24°0.22Snow
28 °Snow

Summit, Sunday, 11 October

Snow. High 28°, low 24°.

Pressure30.09 inHg
Wind7.1 mph NE
Humidity96%
Visibility0.5 mi
Dew point22°
Mon, 1235° / 23°0.06Light snow
35 °Light snow

Summit, Monday, 12 October

Light snow. High 35°, low 23°.

Pressure30.15 inHg
Wind6.2 mph NE
Humidity93%
Visibility—
Dew point27°
Tue, 1346° / 27°0Clear
46 °Clear

Summit, Tuesday, 13 October

Clear. High 46°, low 27°.

Pressure30.06 inHg
Wind10.2 mph SW
Humidity64%
Visibility—
Dew point28°
Wed, 1441° / 27°0.58Snow
41 °Snow

Summit, Wednesday, 14 October

Snow. High 41°, low 27°.

Pressure29.59 inHg
Wind8.3 mph S
Humidity50%
Visibility—
Dew point23°
Thu, 1524° / 9°0.18Snow
24 °Snow

Summit, Thursday, 15 October

Snow. High 24°, low 9°.

Pressure30.36 inHg
Wind8.4 mph N
Humidity79%
Visibility—
Dew point16°
Fri, 1629° / 4°0Clear
29 °Clear

Summit, Friday, 16 October

Clear. High 29°, low 4°.

Pressure30.56 inHg
Wind6 mph S
Humidity70%
Visibility—
Dew point13°
Sat, 1739° / 16°0Overcast
39 °Overcast

Summit, Saturday, 17 October

Overcast. High 39°, low 16°.

Pressure30.27 inHg
Wind7 mph S
Humidity64%
Visibility—
Dew point21°
Sun, 1845° / 23°0Partly cloudy
45 °Partly cloudy

Summit, Sunday, 18 October

Partly cloudy. High 45°, low 23°.

Pressure30.09 inHg
Wind7.9 mph S
Humidity52%
Visibility—
Dew point22°
Mon, 1944° / 24°0Overcast
44 °Overcast

Summit, Monday, 19 October

Overcast. High 44°, low 24°.

Pressure30.21 inHg
Wind5.3 mph S
Humidity44%
Visibility—
Dew point17°
Tue, 2051° / 26°0Partly cloudy
51 °Partly cloudy

Summit, Tuesday, 20 October

Partly cloudy. High 51°, low 26°.

Pressure30.12 inHg
Wind8.3 mph SW
Humidity36%
Visibility—
Dew point19°
Wed, 2152° / 31°0.01Light rain
52 °Light rain

Summit, Wednesday, 21 October

Light rain. High 52°, low 31°.

Pressure29.83 inHg
Wind25.4 mph W
Humidity35%
Visibility—
Dew point19°
Thu, 2233° / 22°0.02Light snow
33 °Light snow

Summit, Thursday, 22 October

Light snow. High 33°, low 22°.

Pressure29.94 inHg
Wind20.1 mph W
Humidity41%
Visibility—
Dew point8°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2344° / 26°0.06Climate normal
44 °Climate normal

Summit, Friday, 23 October

Climate normal for this date — 60-year average.

Average high44°
Average low26°
Average precipitation0.06 in
Chance of precipitation30%
Record high59° (1999)
Record low5° (1995)
Sat, 2443° / 25°0.05Climate normal
43 °Climate normal

Summit, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high43°
Average low25°
Average precipitation0.05 in
Chance of precipitation23%
Record high59° (1992)
Record low-2° (1975)
Sun, 2543° / 25°0.06Climate normal
43 °Climate normal

Summit, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high43°
Average low25°
Average precipitation0.06 in
Chance of precipitation20%
Record high59° (2005)
Record low-5° (2020)
Mon, 2642° / 25°0.08Climate normal
42 °Climate normal

Summit, Monday, 26 October

Climate normal for this date — 60-year average.

Average high42°
Average low25°
Average precipitation0.08 in
Chance of precipitation35%
Record high59° (2024)
Record low-5° (2020)
Tue, 2742° / 22°0.04Climate normal
42 °Climate normal

Summit, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high42°
Average low22°
Average precipitation0.04 in
Chance of precipitation23%
Record high59° (2024)
Record low-3° (1970)
Wed, 2841° / 23°0.07Climate normal
41 °Climate normal

Summit, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high41°
Average low23°
Average precipitation0.07 in
Chance of precipitation33%
Record high57° (1987)
Record low-2° (1980)
Thu, 2938° / 22°0.06Climate normal
38 °Climate normal

Summit, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high38°
Average low22°
Average precipitation0.06 in
Chance of precipitation32%
Record high59° (1962)
Record low-16° (1971)
Fri, 3038° / 20°0.05Climate normal
38 °Climate normal

Summit, Friday, 30 October

Climate normal for this date — 60-year average.

Average high38°
Average low20°
Average precipitation0.05 in
Chance of precipitation28%
Record high60° (1962)
Record low-14° (1972)
Sat, 3137° / 20°0.05Climate normal
37 °Climate normal

Summit, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high37°
Average low20°
Average precipitation0.05 in
Chance of precipitation28%
Record high55° (2014)
Record low-9° (1972)
Sun, 0137° / 20°0.04Climate normal
37 °Climate normal

Summit, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high37°
Average low20°
Average precipitation0.04 in
Chance of precipitation25%
Record high57° (2025)
Record low-20° (2002)
Mon, 0237° / 19°0.04Climate normal
37 °Climate normal

Summit, Monday, 2 November

Climate normal for this date — 60-year average.

Average high37°
Average low19°
Average precipitation0.04 in
Chance of precipitation28%
Record high58° (2020)
Record low-15° (1991)
Tue, 0338° / 20°0.04Climate normal
38 °Climate normal

Summit, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high38°
Average low20°
Average precipitation0.04 in
Chance of precipitation20%
Record high58° (2020)
Record low-10° (1991)
Wed, 0438° / 20°0.04Climate normal
38 °Climate normal

Summit, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high38°
Average low20°
Average precipitation0.04 in
Chance of precipitation23%
Record high55° (2001)
Record low-11° (1973)
Thu, 0538° / 20°0.06Climate normal
38 °Climate normal

Summit, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high38°
Average low20°
Average precipitation0.06 in
Chance of precipitation35%
Record high58° (2020)
Record low-14° (2003)

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 Summit, 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 Summit, 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.