Monthly outlook for Glengarry, MT: average high 55.3°, average low 37.2°. That is 0.1° below the climate normal for October. Precipitation is expected on 6 days (about 1.5 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 9 October (80°), the coolest 13 October (21.6°).
55.3°/37.2°
Average high / low
−0.1°
Below normal
6 / 4
Wet days / normal
1.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
51.4°
55.7°
-2.4°
19 October – 28 October
61.8°
53.6°
+4.5°
29 October – 7 November
at normal
47.1°
—
October records over 66 years
87.4°1 October 2011All-time high
-16.4°30 October 1991All-time low
Climate normals and records are computed from the nearest reference point — Lewistown (5 mi).
Sat, 1054° / 35°0.31
54 °
Glengarry, Saturday, 10 October
Rain. High 54°, low 35°.
Pressure29.65 inHg
Wind6.8 mph N
Humidity46%
Visibility6.2 mi
Dew point35°
Sun, 1138° / 32°0.56
38 °
Glengarry, Sunday, 11 October
Snow. High 38°, low 32°.
Pressure30.06 inHg
Wind6.5 mph NE
Humidity93%
Visibility3.6 mi
Dew point35°
Mon, 1233° / 28°0.48
33 °
Glengarry, Monday, 12 October
Snow. High 33°, low 28°.
Pressure30.21 inHg
Wind3.2 mph NW
Humidity97%
Visibility6.2 mi
Dew point30°
Tue, 1339° / 22°0
39 °
Glengarry, Tuesday, 13 October
Clear. High 39°, low 22°.
Pressure30.12 inHg
Wind4.8 mph SE
Humidity86%
Visibility—
Dew point29°
Wed, 1451° / 26°0
51 °
Glengarry, Wednesday, 14 October
Clear. High 51°, low 26°.
Pressure30.00 inHg
Wind6 mph W
Humidity64%
Visibility—
Dew point30°
Thu, 1544° / 37°0.05
44 °
Glengarry, Thursday, 15 October
Light rain. High 44°, low 37°.
Pressure30.33 inHg
Wind14.8 mph NW
Humidity63%
Visibility—
Dew point31°
Fri, 1648° / 27°0
48 °
Glengarry, Friday, 16 October
Mostly clear. High 48°, low 27°.
Pressure30.62 inHg
Wind14.4 mph NW
Humidity36%
Visibility—
Dew point13°
Sat, 1766° / 41°0
66 °
Glengarry, Saturday, 17 October
Clear. High 66°, low 41°.
Pressure30.00 inHg
Wind20.7 mph NW
Humidity23%
Visibility—
Dew point25°
Sun, 1862° / 42°0
62 °
Glengarry, Sunday, 18 October
Overcast. High 62°, low 42°.
Pressure29.97 inHg
Wind6.6 mph S
Humidity28%
Visibility—
Dew point23°
Mon, 1970° / 49°0
70 °
Glengarry, Monday, 19 October
Partly cloudy. High 70°, low 49°.
Pressure29.74 inHg
Wind6.8 mph S
Humidity18%
Visibility—
Dew point21°
Tue, 2055° / 43°0
55 °
Glengarry, Tuesday, 20 October
Clear. High 55°, low 43°.
Pressure30.09 inHg
Wind11.7 mph NW
Humidity42%
Visibility—
Dew point30°
Wed, 2163° / 43°0.04
63 °
Glengarry, Wednesday, 21 October
Light rain. High 63°, low 43°.
Pressure29.88 inHg
Wind19.8 mph W
Humidity22%
Visibility—
Dew point21°
Thu, 2247° / 36°0.04
47 °
Glengarry, Thursday, 22 October
Light rain. High 47°, low 36°.
Pressure30.45 inHg
Wind14 mph NW
Humidity51%
Visibility—
Dew point26°
Fri, 2364° / 35°0
64 °
Glengarry, Friday, 23 October
Mostly clear. High 64°, low 35°.
Pressure30.06 inHg
Wind7.6 mph S
Humidity24%
Visibility—
Dew point17°
Sat, 2471° / 49°0
71 °
Glengarry, Saturday, 24 October
Clear. High 71°, low 49°.
Pressure29.91 inHg
Wind6.9 mph S
Humidity17%
Visibility—
Dew point18°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 2553° / 35°0.04
53 °
Glengarry, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high53°
Average low35°
Average precipitation0.04 in
Chance of precipitation23%
Record high73° (1990)
Record low-2° (2020)
Mon, 2652° / 34°0.06
52 °
Glengarry, Monday, 26 October
Climate normal for this date — 60-year average.
Average high52°
Average low34°
Average precipitation0.06 in
Chance of precipitation32%
Record high71° (1960)
Record low4° (2020)
Tue, 2751° / 32°0.05
51 °
Glengarry, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high51°
Average low32°
Average precipitation0.05 in
Chance of precipitation28%
Record high70° (2024)
Record low-3° (2023)
Wed, 2850° / 32°0.06
50 °
Glengarry, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high50°
Average low32°
Average precipitation0.06 in
Chance of precipitation25%
Record high71° (1990)
Record low1° (2023)
Thu, 2948° / 31°0.04
48 °
Glengarry, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.04 in
Chance of precipitation22%
Record high72° (1968)
Record low-5° (1991)
Fri, 3048° / 29°0.04
48 °
Glengarry, Friday, 30 October
Climate normal for this date — 60-year average.
Average high48°
Average low29°
Average precipitation0.04 in
Chance of precipitation27%
Record high68° (1987)
Record low-16° (1991)
Sat, 3148° / 30°0.05
48 °
Glengarry, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high48°
Average low30°
Average precipitation0.05 in
Chance of precipitation22%
Record high69° (2008)
Record low0° (1984)
Sun, 0147° / 30°0.03
47 °
Glengarry, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high47°
Average low30°
Average precipitation0.03 in
Chance of precipitation20%
Record high69° (2025)
Record low-5° (1991)
Mon, 0247° / 29°0.02
47 °
Glengarry, Monday, 2 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.02 in
Chance of precipitation20%
Record high68° (2020)
Record low-16° (1991)
Tue, 0348° / 30°0.05
48 °
Glengarry, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high48°
Average low30°
Average precipitation0.05 in
Chance of precipitation22%
Record high68° (1981)
Record low-9° (1991)
Wed, 0448° / 30°0.05
48 °
Glengarry, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high48°
Average low30°
Average precipitation0.05 in
Chance of precipitation23%
Record high69° (1976)
Record low-4° (2003)
Thu, 0547° / 30°0.07
47 °
Glengarry, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high47°
Average low30°
Average precipitation0.07 in
Chance of precipitation30%
Record high69° (2010)
Record low-15° (2003)
Fri, 0646° / 28°0.03
46 °
Glengarry, Friday, 6 November
Climate normal for this date — 60-year average.
Average high46°
Average low28°
Average precipitation0.03 in
Chance of precipitation18%
Record high69° (2010)
Record low-3° (2003)
Sat, 0745° / 28°0.02
45 °
Glengarry, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high45°
Average low28°
Average precipitation0.02 in
Chance of precipitation25%
Record high70° (1999)
Record low-4° (1973)
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 Glengarry, 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 Glengarry, 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.