Monthly outlook for Big Sandy, MT: average high 54.6°, average low 38.6°. That is 0.4° above the climate normal for October. Precipitation is expected on 3 days (about 0.3 inches), against a normal of 3 days and 0.4 inches. The warmest day looks like 17 October (73°), the coolest 31 October (27.6°).
54.6°/38.6°
Average high / low
+0.4°
Above normal
3 / 3
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
59.1°
56.1°
+1.7°
27 October – 5 November
47.1°
49.4°
-1.3°
6 November – 15 November
at normal
44°
—
October records over 66 years
87.3°1 October 2011All-time high
-12.6°30 October 1991All-time low
Sun, 1861° / 36°0
61 °
Big Sandy, Sunday, 18 October
Clear. High 61°, low 36°.
Pressure30.15 inHg
Wind4.7 mph NE
Humidity39%
Visibility6.2 mi
Dew point31°
Mon, 1962° / 35°0
62 °
Big Sandy, Monday, 19 October
Partly cloudy. High 62°, low 35°.
Pressure29.97 inHg
Wind2.6 mph N
Humidity54%
Visibility6.2 mi
Dew point38°
Tue, 2056° / 39°0
56 °
Big Sandy, Tuesday, 20 October
Overcast. High 56°, low 39°.
Pressure30.12 inHg
Wind6.1 mph N
Humidity64%
Visibility6.2 mi
Dew point39°
Wed, 2165° / 38°0
65 °
Big Sandy, Wednesday, 21 October
Partly cloudy. High 65°, low 38°.
Pressure30.06 inHg
Wind0.2 mph NE
Humidity61%
Visibility6.2 mi
Dew point43°
Thu, 2268° / 44°0
68 °
Big Sandy, Thursday, 22 October
Clear. High 68°, low 44°.
Pressure29.85 inHg
Wind6.1 mph NW
Humidity62%
Visibility—
Dew point44°
Fri, 2352° / 46°0.08
52 °
Big Sandy, Friday, 23 October
Light rain. High 52°, low 46°.
Pressure29.80 inHg
Wind15 mph N
Humidity52%
Visibility—
Dew point34°
Sat, 2451° / 37°0
51 °
Big Sandy, Saturday, 24 October
Partly cloudy. High 51°, low 37°.
Pressure30.12 inHg
Wind12.4 mph N
Humidity43%
Visibility—
Dew point24°
Sun, 2553° / 41°0
53 °
Big Sandy, Sunday, 25 October
Overcast. High 53°, low 41°.
Pressure29.80 inHg
Wind14.2 mph SE
Humidity52%
Visibility—
Dew point31°
Mon, 2649° / 38°0.19
49 °
Big Sandy, Monday, 26 October
Light rain. High 49°, low 38°.
Pressure29.56 inHg
Wind25.5 mph W
Humidity96%
Visibility—
Dew point38°
Tue, 2753° / 44°0.06
53 °
Big Sandy, Tuesday, 27 October
Light rain. High 53°, low 44°.
Pressure29.38 inHg
Wind25.8 mph SW
Humidity45%
Visibility—
Dew point31°
Wed, 2852° / 41°0
52 °
Big Sandy, Wednesday, 28 October
Partly cloudy. High 52°, low 41°.
Pressure29.83 inHg
Wind22.9 mph W
Humidity35%
Visibility—
Dew point21°
Thu, 2949° / 36°0
49 °
Big Sandy, Thursday, 29 October
Overcast. High 49°, low 36°.
Pressure29.65 inHg
Wind16.1 mph N
Humidity38%
Visibility—
Dew point24°
Fri, 3038° / 32°0.01
38 °
Big Sandy, Friday, 30 October
Light snow. High 38°, low 32°.
Pressure29.94 inHg
Wind11.8 mph N
Humidity43%
Visibility—
Dew point15°
Sat, 3145° / 28°0
45 °
Big Sandy, Saturday, 31 October
Partly cloudy. High 45°, low 28°.
Pressure29.68 inHg
Wind16.6 mph SW
Humidity37%
Visibility—
Dew point15°
Sun, 0146° / 32°0
46 °
Big Sandy, Sunday, 1 November
Partly cloudy. High 46°, low 32°.
Pressure29.88 inHg
Wind7.3 mph SE
Humidity49%
Visibility—
Dew point23°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0248° / 31°0.02
48 °
Big Sandy, Monday, 2 November
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.02 in
Chance of precipitation15%
Record high66° (1978)
Record low-14° (1991)
Tue, 0349° / 31°0.03
49 °
Big Sandy, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.03 in
Chance of precipitation23%
Record high67° (1983)
Record low-6° (1991)
Wed, 0449° / 33°0.04
49 °
Big Sandy, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low33°
Average precipitation0.04 in
Chance of precipitation22%
Record high69° (1975)
Record low3° (2017)
Thu, 0548° / 31°0.05
48 °
Big Sandy, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.05 in
Chance of precipitation22%
Record high69° (2020)
Record low-7° (2003)
Fri, 0646° / 29°0.02
46 °
Big Sandy, Friday, 6 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.02 in
Chance of precipitation10%
Record high68° (2010)
Record low0° (2003)
Sat, 0746° / 30°0.02
46 °
Big Sandy, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high46°
Average low30°
Average precipitation0.02 in
Chance of precipitation23%
Record high72° (2010)
Record low-1° (1973)
Sun, 0845° / 29°0.05
45 °
Big Sandy, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high45°
Average low29°
Average precipitation0.05 in
Chance of precipitation23%
Record high64° (1999)
Record low2° (1973)
Mon, 0943° / 27°0.04
43 °
Big Sandy, Monday, 9 November
Climate normal for this date — 60-year average.
Average high43°
Average low27°
Average precipitation0.04 in
Chance of precipitation20%
Record high65° (2001)
Record low2° (2022)
Tue, 1042° / 27°0.04
42 °
Big Sandy, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high42°
Average low27°
Average precipitation0.04 in
Chance of precipitation23%
Record high66° (2025)
Record low3° (2022)
Wed, 1142° / 25°0.03
42 °
Big Sandy, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high42°
Average low25°
Average precipitation0.03 in
Chance of precipitation23%
Record high66° (1990)
Record low-8° (2012)
Thu, 1244° / 27°0.03
44 °
Big Sandy, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high44°
Average low27°
Average precipitation0.03 in
Chance of precipitation13%
Record high73° (1999)
Record low-2° (1986)
Fri, 1344° / 28°0.02
44 °
Big Sandy, Friday, 13 November
Climate normal for this date — 60-year average.
Average high44°
Average low28°
Average precipitation0.02 in
Chance of precipitation17%
Record high70° (2025)
Record low1° (2014)
Sat, 1444° / 27°0.04
44 °
Big Sandy, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high44°
Average low27°
Average precipitation0.04 in
Chance of precipitation20%
Record high66° (1999)
Record low-3° (2014)
Sun, 1544° / 27°0.01
44 °
Big Sandy, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high44°
Average low27°
Average precipitation0.01 in
Chance of precipitation7%
Record high65° (2021)
Record low-7° (2014)
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 Big Sandy, 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 Big Sandy, 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.