Monthly outlook for Amherst, MT: average high 56.2°, average low 36.5°. That is 1.8° above the climate normal for October. Precipitation is expected on 1 day (about 1.4 inches), against a normal of 4 days and 0.7 inches. The warmest day looks like 22 October (72.3°), the coolest 25 October (23.2°).
56.2°/36.5°
Average high / low
+1.8°
Above normal
1 / 4
Wet days / normal
1.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
59.5°
54.9°
+2.6°
26 October – 4 November
50.7°
48.7°
+1.1°
5 November – 14 November
at normal
43.9°
—
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 (11 mi).
Sat, 1772° / 45°0
72 °
Amherst, Saturday, 17 October
Overcast. High 72°, low 45°.
Pressure29.91 inHg
Wind11 mph S
Humidity23%
Visibility6.2 mi
Dew point30°
Sun, 1862° / 40°0
62 °
Amherst, Sunday, 18 October
Clear. High 62°, low 40°.
Pressure30.12 inHg
Wind3.3 mph SE
Humidity42%
Visibility6.2 mi
Dew point35°
Mon, 1971° / 40°0
71 °
Amherst, Monday, 19 October
Mostly clear. High 71°, low 40°.
Pressure29.85 inHg
Wind10.6 mph S
Humidity36%
Visibility6.2 mi
Dew point38°
Tue, 2058° / 44°0
58 °
Amherst, Tuesday, 20 October
Overcast. High 58°, low 44°.
Pressure30.03 inHg
Wind7.2 mph NW
Humidity60%
Visibility6.2 mi
Dew point41°
Wed, 2166° / 39°0
66 °
Amherst, Wednesday, 21 October
Clear. High 66°, low 39°.
Pressure30.09 inHg
Wind9.6 mph S
Humidity52%
Visibility—
Dew point40°
Thu, 2272° / 50°0
72 °
Amherst, Thursday, 22 October
Mostly clear. High 72°, low 50°.
Pressure29.83 inHg
Wind10 mph S
Humidity40%
Visibility—
Dew point40°
Fri, 2352° / 33°1.37
52 °
Amherst, Friday, 23 October
Snow. High 52°, low 33°.
Pressure30.12 inHg
Wind13.1 mph NW
Humidity99%
Visibility—
Dew point34°
Sat, 2436° / 25°0
36 °
Amherst, Saturday, 24 October
Overcast. High 36°, low 25°.
Pressure30.53 inHg
Wind6.6 mph S
Humidity80%
Visibility—
Dew point28°
Sun, 2538° / 23°0
38 °
Amherst, Sunday, 25 October
Overcast. High 38°, low 23°.
Pressure30.21 inHg
Wind6.9 mph S
Humidity83%
Visibility—
Dew point30°
Mon, 2647° / 32°0
47 °
Amherst, Monday, 26 October
Overcast. High 47°, low 32°.
Pressure30.15 inHg
Wind10.3 mph W
Humidity65%
Visibility—
Dew point31°
Tue, 2749° / 34°0
49 °
Amherst, Tuesday, 27 October
Clear. High 49°, low 34°.
Pressure30.09 inHg
Wind6.8 mph SE
Humidity65%
Visibility—
Dew point34°
Wed, 2848° / 39°0
48 °
Amherst, Wednesday, 28 October
Partly cloudy. High 48°, low 39°.
Pressure30.03 inHg
Wind11.6 mph N
Humidity56%
Visibility—
Dew point31°
Thu, 2941° / 35°0
41 °
Amherst, Thursday, 29 October
Overcast. High 41°, low 35°.
Pressure30.00 inHg
Wind7.5 mph SE
Humidity72%
Visibility—
Dew point30°
Fri, 3057° / 35°0
57 °
Amherst, Friday, 30 October
Clear. High 57°, low 35°.
Pressure30.00 inHg
Wind9.8 mph S
Humidity48%
Visibility—
Dew point30°
Sat, 3162° / 40°0
62 °
Amherst, Saturday, 31 October
Clear. High 62°, low 40°.
Pressure30.00 inHg
Wind8.6 mph S
Humidity36%
Visibility—
Dew point28°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0147° / 30°0.03
47 °
Amherst, 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 °
Amherst, 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 °
Amherst, 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 °
Amherst, 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 °
Amherst, 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 °
Amherst, 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 °
Amherst, 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)
Sun, 0844° / 27°0.06
44 °
Amherst, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high44°
Average low27°
Average precipitation0.06 in
Chance of precipitation30%
Record high68° (1999)
Record low-2° (2022)
Mon, 0943° / 26°0.05
43 °
Amherst, Monday, 9 November
Climate normal for this date — 60-year average.
Average high43°
Average low26°
Average precipitation0.05 in
Chance of precipitation22%
Record high69° (2016)
Record low-4° (2022)
Tue, 1042° / 26°0.04
42 °
Amherst, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high42°
Average low26°
Average precipitation0.04 in
Chance of precipitation22%
Record high64° (2025)
Record low-8° (1986)
Wed, 1142° / 24°0.03
42 °
Amherst, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high42°
Average low24°
Average precipitation0.03 in
Chance of precipitation22%
Record high67° (1990)
Record low-8° (2012)
Thu, 1244° / 25°0.04
44 °
Amherst, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high44°
Average low25°
Average precipitation0.04 in
Chance of precipitation23%
Record high70° (1990)
Record low-22° (1986)
Fri, 1343° / 26°0.04
43 °
Amherst, Friday, 13 November
Climate normal for this date — 60-year average.
Average high43°
Average low26°
Average precipitation0.04 in
Chance of precipitation22%
Record high65° (2025)
Record low-8° (1986)
Sat, 1444° / 26°0.04
44 °
Amherst, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high44°
Average low26°
Average precipitation0.04 in
Chance of precipitation27%
Record high67° (1999)
Record low-2° (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 Amherst, 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 Amherst, 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.