Monthly outlook for Amherst, MT: average high 61°, average low 41.3°. That is 4.8° above the climate normal for October. Precipitation is expected on 2 days (about 0.9 inches), against a normal of 4 days and 0.7 inches. The warmest day looks like 22 October (75.1°), the coolest 24 October (30.8°).
61°/41.3°
Average high / low
+4.8°
Above normal
2 / 4
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
62.8°
54.6°
+4.6°
27 October – 5 November
57.9°
48.2°
+5.4°
6 November – 15 November
at normal
43.7°
—
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).
Sun, 1862° / 40°0
62 °
Amherst, Sunday, 18 October
Overcast. High 62°, low 40°.
Pressure30.15 inHg
Wind2.1 mph NE
Humidity44%
Visibility6.2 mi
Dew point34°
Mon, 1971° / 39°0
71 °
Amherst, Monday, 19 October
Clear. High 71°, low 39°.
Pressure29.88 inHg
Wind11.1 mph S
Humidity36%
Visibility6.2 mi
Dew point38°
Tue, 2058° / 43°0
58 °
Amherst, Tuesday, 20 October
Overcast. High 58°, low 43°.
Pressure30.09 inHg
Wind6.6 mph NW
Humidity61%
Visibility6.2 mi
Dew point41°
Wed, 2168° / 39°0
68 °
Amherst, Wednesday, 21 October
Clear. High 68°, low 39°.
Pressure30.03 inHg
Wind6.4 mph S
Humidity46%
Visibility6.2 mi
Dew point41°
Thu, 2275° / 50°0
75 °
Amherst, Thursday, 22 October
Partly cloudy. High 75°, low 50°.
Pressure29.80 inHg
Wind9.1 mph S
Humidity43%
Visibility—
Dew point44°
Fri, 2353° / 42°0.87
53 °
Amherst, Friday, 23 October
Rain. High 53°, low 42°.
Pressure29.77 inHg
Wind12.6 mph NW
Humidity77%
Visibility—
Dew point44°
Sat, 2444° / 31°0
44 °
Amherst, Saturday, 24 October
Clear. High 44°, low 31°.
Pressure30.53 inHg
Wind7.3 mph SE
Humidity57%
Visibility—
Dew point25°
Sun, 2559° / 34°0
59 °
Amherst, Sunday, 25 October
Clear. High 59°, low 34°.
Pressure30.15 inHg
Wind10.6 mph S
Humidity43%
Visibility—
Dew point29°
Mon, 2666° / 42°0
66 °
Amherst, Monday, 26 October
Clear. High 66°, low 42°.
Pressure29.85 inHg
Wind11.4 mph S
Humidity27%
Visibility—
Dew point25°
Tue, 2769° / 46°0
69 °
Amherst, Tuesday, 27 October
Clear. High 69°, low 46°.
Pressure29.62 inHg
Wind11 mph NW
Humidity22%
Visibility—
Dew point22°
Wed, 2860° / 48°0
60 °
Amherst, Wednesday, 28 October
Overcast. High 60°, low 48°.
Pressure29.62 inHg
Wind18.9 mph W
Humidity31%
Visibility—
Dew point28°
Thu, 2954° / 40°0
54 °
Amherst, Thursday, 29 October
Overcast. High 54°, low 40°.
Pressure29.83 inHg
Wind21.7 mph W
Humidity34%
Visibility—
Dew point22°
Fri, 3060° / 42°0
60 °
Amherst, Friday, 30 October
Overcast. High 60°, low 42°.
Pressure29.44 inHg
Wind23.5 mph SW
Humidity32%
Visibility—
Dew point25°
Sat, 3148° / 38°0.02
48 °
Amherst, Saturday, 31 October
Snow. High 48°, low 38°.
Pressure29.56 inHg
Wind19.2 mph SW
Humidity27%
Visibility—
Dew point13°
Sun, 0155° / 42°0.05
55 °
Amherst, Sunday, 1 November
Light rain. High 55°, low 42°.
Pressure29.44 inHg
Wind23.3 mph W
Humidity40%
Visibility—
Dew point29°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Sun, 1544° / 26°0.03
44 °
Amherst, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high44°
Average low26°
Average precipitation0.03 in
Chance of precipitation18%
Record high65° (1999)
Record low-9° (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.