Monthly outlook for Hamilton, MT: average high 55.3°, average low 37.8°. That is 1.3° below the climate normal for October. Precipitation is expected on 5 days (about 1.3 inches), against a normal of 5 days and 0.9 inches. The warmest day looks like 9 October (71.5°), the coolest 13 October (24.5°).
55.3°/37.8°
Average high / low
−1.3°
Below normal
5 / 5
Wet days / normal
1.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
54.8°
58.4°
-2°
19 October – 28 October
56.1°
54.5°
+0.9°
29 October – 7 November
at normal
47.9°
—
October records over 66 years
88.3°3 October 2010All-time high
-5.4°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Corvallis (5 mi).
Sat, 1050° / 35°0.48
50 °
Hamilton, Saturday, 10 October
Rain. High 50°, low 35°.
Pressure29.74 inHg
Wind2.5 mph NE
Humidity86%
Visibility4.0 mi
Dew point41°
Sun, 1137° / 32°0.42
37 °
Hamilton, Sunday, 11 October
Snow. High 37°, low 32°.
Pressure29.94 inHg
Wind9.1 mph N
Humidity90%
Visibility3.4 mi
Dew point27°
Mon, 1237° / 30°0.11
37 °
Hamilton, Monday, 12 October
Light snow. High 37°, low 30°.
Pressure30.09 inHg
Wind1.7 mph N
Humidity90%
Visibility6.2 mi
Dew point28°
Tue, 1346° / 25°0
46 °
Hamilton, Tuesday, 13 October
Clear. High 46°, low 25°.
Pressure30.15 inHg
Wind3.2 mph W
Humidity73%
Visibility—
Dew point29°
Wed, 1450° / 28°0
50 °
Hamilton, Wednesday, 14 October
Overcast. High 50°, low 28°.
Pressure30.09 inHg
Wind5.1 mph SW
Humidity56%
Visibility—
Dew point31°
Thu, 1555° / 38°0.01
55 °
Hamilton, Thursday, 15 October
Light rain. High 55°, low 38°.
Pressure30.30 inHg
Wind5.5 mph NE
Humidity47%
Visibility—
Dew point32°
Fri, 1663° / 34°0
63 °
Hamilton, Friday, 16 October
Overcast. High 63°, low 34°.
Pressure30.39 inHg
Wind3.5 mph SW
Humidity39%
Visibility—
Dew point26°
Sat, 1770° / 46°0
70 °
Hamilton, Saturday, 17 October
Partly cloudy. High 70°, low 46°.
Pressure30.18 inHg
Wind4.5 mph SW
Humidity23%
Visibility—
Dew point24°
Sun, 1868° / 50°0
68 °
Hamilton, Sunday, 18 October
Overcast. High 68°, low 50°.
Pressure30.03 inHg
Wind3.8 mph SW
Humidity27%
Visibility—
Dew point27°
Mon, 1965° / 48°0
65 °
Hamilton, Monday, 19 October
Overcast. High 65°, low 48°.
Pressure29.94 inHg
Wind4.4 mph N
Humidity35%
Visibility—
Dew point30°
Tue, 2053° / 42°0.24
53 °
Hamilton, Tuesday, 20 October
Light rain. High 53°, low 42°.
Pressure29.88 inHg
Wind5.2 mph NW
Humidity74%
Visibility—
Dew point43°
Wed, 2147° / 38°0.05
47 °
Hamilton, Wednesday, 21 October
Snow. High 47°, low 38°.
Pressure30.27 inHg
Wind5.4 mph NE
Humidity82%
Visibility—
Dew point38°
Thu, 2254° / 34°0
54 °
Hamilton, Thursday, 22 October
Clear. High 54°, low 34°.
Pressure30.15 inHg
Wind2.8 mph N
Humidity61%
Visibility—
Dew point33°
Fri, 2358° / 37°0
58 °
Hamilton, Friday, 23 October
Clear. High 58°, low 37°.
Pressure29.97 inHg
Wind3.2 mph E
Humidity60%
Visibility—
Dew point36°
Sat, 2460° / 41°0
60 °
Hamilton, Saturday, 24 October
Clear. High 60°, low 41°.
Pressure29.94 inHg
Wind4.5 mph N
Humidity46%
Visibility—
Dew point33°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 2553° / 34°0.09
53 °
Hamilton, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high53°
Average low34°
Average precipitation0.09 in
Chance of precipitation33%
Record high72° (2005)
Record low-1° (2020)
Mon, 2652° / 33°0.08
52 °
Hamilton, Monday, 26 October
Climate normal for this date — 60-year average.
Average high52°
Average low33°
Average precipitation0.08 in
Chance of precipitation37%
Record high70° (2024)
Record low-5° (2020)
Tue, 2752° / 32°0.07
52 °
Hamilton, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high52°
Average low32°
Average precipitation0.07 in
Chance of precipitation28%
Record high66° (2024)
Record low8° (1996)
Wed, 2851° / 32°0.07
51 °
Hamilton, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high51°
Average low32°
Average precipitation0.07 in
Chance of precipitation32%
Record high67° (1987)
Record low9° (1971)
Thu, 2950° / 32°0.06
50 °
Hamilton, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high50°
Average low32°
Average precipitation0.06 in
Chance of precipitation27%
Record high68° (1964)
Record low6° (1971)
Fri, 3049° / 31°0.04
49 °
Hamilton, Friday, 30 October
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.04 in
Chance of precipitation28%
Record high67° (2008)
Record low5° (1991)
Sat, 3148° / 31°0.08
48 °
Hamilton, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.08 in
Chance of precipitation28%
Record high67° (2008)
Record low0° (1996)
Sun, 0149° / 31°0.07
49 °
Hamilton, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.07 in
Chance of precipitation33%
Record high69° (2025)
Record low6° (1991)
Mon, 0248° / 30°0.08
48 °
Hamilton, Monday, 2 November
Climate normal for this date — 60-year average.
Average high48°
Average low30°
Average precipitation0.08 in
Chance of precipitation40%
Record high67° (2020)
Record low-13° (1991)
Tue, 0348° / 29°0.05
48 °
Hamilton, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high48°
Average low29°
Average precipitation0.05 in
Chance of precipitation23%
Record high67° (2020)
Record low1° (1973)
Wed, 0448° / 30°0.07
48 °
Hamilton, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high48°
Average low30°
Average precipitation0.07 in
Chance of precipitation47%
Record high64° (2021)
Record low1° (1973)
Thu, 0548° / 30°0.08
48 °
Hamilton, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high48°
Average low30°
Average precipitation0.08 in
Chance of precipitation37%
Record high68° (2020)
Record low0° (1961)
Fri, 0646° / 30°0.09
46 °
Hamilton, Friday, 6 November
Climate normal for this date — 60-year average.
Average high46°
Average low30°
Average precipitation0.09 in
Chance of precipitation48%
Record high65° (2012)
Record low1° (1971)
Sat, 0746° / 29°0.09
46 °
Hamilton, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.09 in
Chance of precipitation47%
Record high59° (2016)
Record low2° (1990)
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 Hamilton, 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 Hamilton, 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.