Monthly outlook for Plains, MT: average high 61.3°, average low 39.2°. That is 1.7° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 0.9 inches. The warmest day looks like 17 October (74.3°), the coolest 13 October (25.7°).
61.3°/39.2°
Average high / low
+1.7°
Above normal
2 / 5
Wet days / normal
0.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
58.8°
59.3°
-0.3°
20 October – 29 October
65.5°
54.7°
+6°
30 October – 8 November
at normal
48.4°
—
October records over 66 years
85.8°1 October 1997All-time high
0.1°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Paradise (6 mi).
Sun, 1142° / 34°0.12
42 °
Plains, Sunday, 11 October
Snow. High 42°, low 34°.
Pressure30.03 inHg
Wind5.2 mph N
Humidity88%
Visibility4.8 mi
Dew point27°
Mon, 1246° / 31°0.02
46 °
Plains, Monday, 12 October
Light snow. High 46°, low 31°.
Pressure30.12 inHg
Wind1.2 mph E
Humidity80%
Visibility6.2 mi
Dew point27°
Tue, 1353° / 26°0
53 °
Plains, Tuesday, 13 October
Clear. High 53°, low 26°.
Pressure30.18 inHg
Wind1.6 mph SW
Humidity59%
Visibility6.2 mi
Dew point30°
Wed, 1459° / 32°0
59 °
Plains, Wednesday, 14 October
Overcast. High 59°, low 32°.
Pressure30.24 inHg
Wind1.7 mph S
Humidity49%
Visibility6.2 mi
Dew point31°
Thu, 1560° / 33°0
60 °
Plains, Thursday, 15 October
Clear. High 60°, low 33°.
Pressure30.47 inHg
Wind3.8 mph E
Humidity52%
Visibility—
Dew point34°
Fri, 1664° / 37°0
64 °
Plains, Friday, 16 October
Mostly clear. High 64°, low 37°.
Pressure30.36 inHg
Wind2.8 mph NE
Humidity53%
Visibility—
Dew point36°
Sat, 1774° / 44°0
74 °
Plains, Saturday, 17 October
Overcast. High 74°, low 44°.
Pressure30.12 inHg
Wind10.8 mph SW
Humidity33%
Visibility—
Dew point34°
Sun, 1873° / 47°0
73 °
Plains, Sunday, 18 October
Partly cloudy. High 73°, low 47°.
Pressure30.06 inHg
Wind10.1 mph W
Humidity31%
Visibility—
Dew point34°
Mon, 1969° / 48°0
69 °
Plains, Monday, 19 October
Mostly clear. High 69°, low 48°.
Pressure30.03 inHg
Wind11 mph W
Humidity33%
Visibility—
Dew point35°
Tue, 2059° / 45°0
59 °
Plains, Tuesday, 20 October
Overcast. High 59°, low 45°.
Pressure30.06 inHg
Wind12.7 mph SW
Humidity43%
Visibility—
Dew point34°
Wed, 2159° / 37°0
59 °
Plains, Wednesday, 21 October
Overcast. High 59°, low 37°.
Pressure30.18 inHg
Wind3.5 mph E
Humidity41%
Visibility—
Dew point29°
Thu, 2265° / 39°0
65 °
Plains, Thursday, 22 October
Overcast. High 65°, low 39°.
Pressure30.21 inHg
Wind4.1 mph E
Humidity37%
Visibility—
Dew point28°
Fri, 2368° / 42°0
68 °
Plains, Friday, 23 October
Partly cloudy. High 68°, low 42°.
Pressure30.18 inHg
Wind3.3 mph E
Humidity39%
Visibility—
Dew point33°
Sat, 2472° / 42°0
72 °
Plains, Saturday, 24 October
Clear. High 72°, low 42°.
Pressure30.12 inHg
Wind3.2 mph E
Humidity41%
Visibility—
Dew point35°
Sun, 2570° / 47°0
70 °
Plains, Sunday, 25 October
Overcast. High 70°, low 47°.
Pressure30.00 inHg
Wind7.8 mph W
Humidity35%
Visibility—
Dew point34°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2653° / 36°0.07
53 °
Plains, Monday, 26 October
Climate normal for this date — 60-year average.
Average high53°
Average low36°
Average precipitation0.07 in
Chance of precipitation40%
Record high71° (1986)
Record low0° (2020)
Tue, 2752° / 35°0.07
52 °
Plains, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high52°
Average low35°
Average precipitation0.07 in
Chance of precipitation37%
Record high67° (1985)
Record low13° (2020)
Wed, 2852° / 35°0.07
52 °
Plains, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high52°
Average low35°
Average precipitation0.07 in
Chance of precipitation37%
Record high69° (2008)
Record low18° (1971)
Thu, 2951° / 35°0.07
51 °
Plains, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.07 in
Chance of precipitation43%
Record high70° (1987)
Record low16° (1961)
Fri, 3050° / 34°0.06
50 °
Plains, Friday, 30 October
Climate normal for this date — 60-year average.
Average high50°
Average low34°
Average precipitation0.06 in
Chance of precipitation28%
Record high70° (2008)
Record low10° (2002)
Sat, 3149° / 35°0.1
49 °
Plains, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.1 in
Chance of precipitation42%
Record high69° (1988)
Record low16° (2002)
Sun, 0150° / 34°0.09
50 °
Plains, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high50°
Average low34°
Average precipitation0.09 in
Chance of precipitation37%
Record high68° (1965)
Record low8° (1984)
Mon, 0249° / 34°0.09
49 °
Plains, Monday, 2 November
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.09 in
Chance of precipitation37%
Record high65° (1981)
Record low3° (1961)
Tue, 0349° / 34°0.04
49 °
Plains, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.04 in
Chance of precipitation25%
Record high67° (2020)
Record low6° (1973)
Wed, 0449° / 35°0.1
49 °
Plains, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.1 in
Chance of precipitation48%
Record high65° (1980)
Record low6° (1961)
Thu, 0548° / 34°0.09
48 °
Plains, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.09 in
Chance of precipitation47%
Record high67° (1980)
Record low1° (1961)
Fri, 0647° / 33°0.11
47 °
Plains, Friday, 6 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.11 in
Chance of precipitation48%
Record high66° (2012)
Record low12° (1971)
Sat, 0746° / 33°0.13
46 °
Plains, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.13 in
Chance of precipitation42%
Record high61° (1978)
Record low12° (2017)
Sun, 0846° / 32°0.08
46 °
Plains, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.08 in
Chance of precipitation52%
Record high63° (2016)
Record low10° (1994)
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 Plains, 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 Plains, 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.