Monthly outlook for Eureka, MT: average high 54.5°, average low 38.1°. That is 2.3° above the climate normal for October. Precipitation is expected on 4 days (about 1.0 inches), against a normal of 5 days and 1.0 inches. The warmest day looks like 17 October (64.9°), the coolest 25 October (31.7°).
54.5°/38.1°
Average high / low
+2.3°
Above normal
4 / 5
Wet days / normal
1.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
15 October – 24 October
57.1°
52.5°
+2.6°
25 October – 3 November
50.2°
45.6°
+2.5°
4 November – 13 November
at normal
41°
—
October records over 66 years
84.2°2 October 1992All-time high
0.3°30 October 1991All-time low
Fri, 1662° / 39°0
62 °
Eureka, Friday, 16 October
Overcast. High 62°, low 39°.
Pressure30.39 inHg
Wind4 mph SE
Humidity41%
Visibility6.2 mi
Dew point34°
Sat, 1765° / 44°0
65 °
Eureka, Saturday, 17 October
Overcast. High 65°, low 44°.
Pressure29.91 inHg
Wind10.4 mph SE
Humidity32%
Visibility6.2 mi
Dew point33°
Sun, 1858° / 41°0
58 °
Eureka, Sunday, 18 October
Mostly clear. High 58°, low 41°.
Pressure30.12 inHg
Wind2 mph E
Humidity52%
Visibility6.2 mi
Dew point36°
Mon, 1957° / 39°0
57 °
Eureka, Monday, 19 October
Overcast. High 57°, low 39°.
Pressure29.91 inHg
Wind2.1 mph NW
Humidity67%
Visibility—
Dew point38°
Tue, 2059° / 44°0
59 °
Eureka, Tuesday, 20 October
Overcast. High 59°, low 44°.
Pressure29.94 inHg
Wind3.6 mph E
Humidity50%
Visibility—
Dew point37°
Wed, 2159° / 42°0
59 °
Eureka, Wednesday, 21 October
Overcast. High 59°, low 42°.
Pressure29.94 inHg
Wind2.1 mph NE
Humidity58%
Visibility—
Dew point35°
Thu, 2256° / 43°0.01
56 °
Eureka, Thursday, 22 October
Light rain. High 56°, low 43°.
Pressure29.83 inHg
Wind5.3 mph S
Humidity61%
Visibility—
Dew point39°
Fri, 2351° / 41°0.04
51 °
Eureka, Friday, 23 October
Light rain. High 51°, low 41°.
Pressure30.00 inHg
Wind5.7 mph S
Humidity58%
Visibility—
Dew point36°
Sat, 2445° / 37°0.1
45 °
Eureka, Saturday, 24 October
Snow. High 45°, low 37°.
Pressure30.47 inHg
Wind3.3 mph S
Humidity73%
Visibility—
Dew point34°
Sun, 2550° / 32°0
50 °
Eureka, Sunday, 25 October
Partly cloudy. High 50°, low 32°.
Pressure30.45 inHg
Wind2.9 mph S
Humidity60%
Visibility—
Dew point30°
Mon, 2650° / 34°0
50 °
Eureka, Monday, 26 October
Overcast. High 50°, low 34°.
Pressure30.12 inHg
Wind8.3 mph S
Humidity51%
Visibility—
Dew point27°
Tue, 2747° / 36°0.19
47 °
Eureka, Tuesday, 27 October
Light rain. High 47°, low 36°.
Pressure29.97 inHg
Wind4.6 mph SE
Humidity74%
Visibility—
Dew point37°
Wed, 2851° / 37°0.65
51 °
Eureka, Wednesday, 28 October
Rain. High 51°, low 37°.
Pressure29.91 inHg
Wind7.2 mph SW
Humidity73%
Visibility—
Dew point41°
Thu, 2953° / 33°0
53 °
Eureka, Thursday, 29 October
Clear. High 53°, low 33°.
Pressure30.33 inHg
Wind4.9 mph S
Humidity53%
Visibility—
Dew point29°
Fri, 3051° / 33°0
51 °
Eureka, Friday, 30 October
Mostly clear. High 51°, low 33°.
Pressure30.39 inHg
Wind3.2 mph SE
Humidity61%
Visibility—
Dew point29°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 3144° / 32°0.1
44 °
Eureka, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high44°
Average low32°
Average precipitation0.1 in
Chance of precipitation38%
Record high63° (2008)
Record low2° (1984)
Sun, 0144° / 32°0.09
44 °
Eureka, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high44°
Average low32°
Average precipitation0.09 in
Chance of precipitation38%
Record high61° (2008)
Record low0° (1991)
Mon, 0244° / 31°0.1
44 °
Eureka, Monday, 2 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.1 in
Chance of precipitation37%
Record high60° (2020)
Record low-1° (1991)
Tue, 0344° / 32°0.06
44 °
Eureka, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high44°
Average low32°
Average precipitation0.06 in
Chance of precipitation32%
Record high60° (1981)
Record low11° (1991)
Wed, 0443° / 33°0.11
43 °
Eureka, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high43°
Average low33°
Average precipitation0.11 in
Chance of precipitation47%
Record high62° (1975)
Record low9° (2017)
Thu, 0543° / 31°0.07
43 °
Eureka, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high43°
Average low31°
Average precipitation0.07 in
Chance of precipitation43%
Record high62° (1975)
Record low8° (1967)
Fri, 0642° / 30°0.1
42 °
Eureka, Friday, 6 November
Climate normal for this date — 60-year average.
Average high42°
Average low30°
Average precipitation0.1 in
Chance of precipitation47%
Record high56° (2010)
Record low7° (1971)
Sat, 0741° / 29°0.09
41 °
Eureka, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high41°
Average low29°
Average precipitation0.09 in
Chance of precipitation48%
Record high55° (1999)
Record low6° (2017)
Sun, 0841° / 29°0.07
41 °
Eureka, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high41°
Average low29°
Average precipitation0.07 in
Chance of precipitation40%
Record high56° (2016)
Record low0° (2022)
Mon, 0941° / 29°0.08
41 °
Eureka, Monday, 9 November
Climate normal for this date — 60-year average.
Average high41°
Average low29°
Average precipitation0.08 in
Chance of precipitation42%
Record high59° (2016)
Record low1° (1986)
Tue, 1039° / 28°0.07
39 °
Eureka, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high39°
Average low28°
Average precipitation0.07 in
Chance of precipitation40%
Record high57° (2016)
Record low-4° (1986)
Wed, 1140° / 27°0.07
40 °
Eureka, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high40°
Average low27°
Average precipitation0.07 in
Chance of precipitation42%
Record high55° (2016)
Record low-7° (1985)
Thu, 1240° / 29°0.09
40 °
Eureka, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high40°
Average low29°
Average precipitation0.09 in
Chance of precipitation40%
Record high56° (2016)
Record low-5° (1986)
Fri, 1340° / 29°0.07
40 °
Eureka, Friday, 13 November
Climate normal for this date — 60-year average.
Average high40°
Average low29°
Average precipitation0.07 in
Chance of precipitation45%
Record high59° (2025)
Record low9° (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 Eureka, 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 Eureka, 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.