Monthly outlook for Big Sandy, MT: average high 57.5°, average low 37.9°. That is 1.7° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 3 days and 0.5 inches. The warmest day looks like 17 October (73.1°), the coolest 16 October (31.7°).
57.5°/37.9°
Average high / low
+1.7°
Above normal
0 / 3
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
60.5°
56.5°
+2.2°
26 October – 4 November
52.6°
49.9°
+1.5°
5 November – 14 November
at normal
44.4°
—
October records over 66 years
87.3°1 October 2011All-time high
-12.6°30 October 1991All-time low
Sat, 1773° / 44°0
73 °
Big Sandy, Saturday, 17 October
Overcast. High 73°, low 44°.
Pressure29.88 inHg
Wind11.1 mph S
Humidity29%
Visibility6.2 mi
Dew point34°
Sun, 1861° / 38°0
61 °
Big Sandy, Sunday, 18 October
Clear. High 61°, low 38°.
Pressure30.15 inHg
Wind3.5 mph S
Humidity47%
Visibility6.2 mi
Dew point36°
Mon, 1961° / 35°0
61 °
Big Sandy, Monday, 19 October
Partly cloudy. High 61°, low 35°.
Pressure29.94 inHg
Wind3.2 mph N
Humidity54%
Visibility6.2 mi
Dew point36°
Tue, 2057° / 39°0
57 °
Big Sandy, Tuesday, 20 October
Overcast. High 57°, low 39°.
Pressure30.09 inHg
Wind8.2 mph N
Humidity63%
Visibility6.2 mi
Dew point40°
Wed, 2164° / 37°0
64 °
Big Sandy, Wednesday, 21 October
Clear. High 64°, low 37°.
Pressure30.12 inHg
Wind9.8 mph SE
Humidity56%
Visibility—
Dew point38°
Thu, 2268° / 46°0
68 °
Big Sandy, Thursday, 22 October
Overcast. High 68°, low 46°.
Pressure29.85 inHg
Wind13.9 mph N
Humidity52%
Visibility—
Dew point41°
Fri, 2352° / 41°0.04
52 °
Big Sandy, Friday, 23 October
Light rain. High 52°, low 41°.
Pressure30.09 inHg
Wind19.4 mph NW
Humidity53%
Visibility—
Dew point28°
Sat, 2448° / 33°0
48 °
Big Sandy, Saturday, 24 October
Partly cloudy. High 48°, low 33°.
Pressure30.50 inHg
Wind11.3 mph SE
Humidity33%
Visibility—
Dew point15°
Sun, 2549° / 36°0
49 °
Big Sandy, Sunday, 25 October
Partly cloudy. High 49°, low 36°.
Pressure30.18 inHg
Wind14.8 mph SE
Humidity43%
Visibility—
Dew point23°
Mon, 2650° / 37°0
50 °
Big Sandy, Monday, 26 October
Overcast. High 50°, low 37°.
Pressure30.15 inHg
Wind6.8 mph NW
Humidity43%
Visibility—
Dew point22°
Tue, 2755° / 37°0
55 °
Big Sandy, Tuesday, 27 October
Clear. High 55°, low 37°.
Pressure30.09 inHg
Wind8.1 mph SE
Humidity44%
Visibility—
Dew point27°
Wed, 2850° / 39°0
50 °
Big Sandy, Wednesday, 28 October
Mostly clear. High 50°, low 39°.
Pressure30.09 inHg
Wind13.9 mph N
Humidity41%
Visibility—
Dew point23°
Thu, 2945° / 36°0
45 °
Big Sandy, Thursday, 29 October
Overcast. High 45°, low 36°.
Pressure30.03 inHg
Wind11.7 mph SE
Humidity65%
Visibility—
Dew point30°
Fri, 3055° / 35°0
55 °
Big Sandy, Friday, 30 October
Partly cloudy. High 55°, low 35°.
Pressure30.03 inHg
Wind7.6 mph SE
Humidity47%
Visibility—
Dew point27°
Sat, 3161° / 41°0
61 °
Big Sandy, Saturday, 31 October
Clear. High 61°, low 41°.
Pressure30.03 inHg
Wind11.9 mph SW
Humidity38%
Visibility—
Dew point26°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0148° / 31°0.02
48 °
Big Sandy, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.02 in
Chance of precipitation15%
Record high72° (2025)
Record low-12° (1984)
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)
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.