Monthly outlook for Eureka, MT: average high 55.4°, average low 39.3°. That is 1.9° above the climate normal for October. Precipitation is expected on 1 day (about 0.2 inches), against a normal of 5 days and 1.0 inches. The warmest day looks like 16 October (67.6°), the coolest 12 October (32.9°).
55.4°/39.3°
Average high / low
+1.9°
Above normal
1 / 5
Wet days / normal
0.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
57.6°
53.5°
+2.2°
22 October – 31 October
51.8°
47.7°
+2.3°
1 November – 10 November
at normal
42.2°
—
October records over 66 years
84.2°2 October 1992All-time high
0.3°30 October 1991All-time low
Tue, 1353° / 34°0
53 °
Eureka, Tuesday, 13 October
Mostly clear. High 53°, low 34°.
Pressure30.18 inHg
Wind1.9 mph SE
Humidity56%
Visibility6.2 mi
Dew point32°
Wed, 1459° / 38°0
59 °
Eureka, Wednesday, 14 October
Mostly clear. High 59°, low 38°.
Pressure30.21 inHg
Wind4.1 mph SE
Humidity51%
Visibility4.8 mi
Dew point35°
Thu, 1560° / 39°0
60 °
Eureka, Thursday, 15 October
Mostly clear. High 60°, low 39°.
Pressure30.62 inHg
Wind1.9 mph NW
Humidity72%
Visibility1.6 mi
Dew point41°
Fri, 1668° / 42°0
68 °
Eureka, Friday, 16 October
Mostly clear. High 68°, low 42°.
Pressure30.33 inHg
Wind3.9 mph E
Humidity42%
Visibility6.2 mi
Dew point36°
Sat, 1766° / 47°0
66 °
Eureka, Saturday, 17 October
Clear. High 66°, low 47°.
Pressure29.85 inHg
Wind8.2 mph SE
Humidity35%
Visibility—
Dew point34°
Sun, 1861° / 43°0
61 °
Eureka, Sunday, 18 October
Partly cloudy. High 61°, low 43°.
Pressure30.00 inHg
Wind4 mph S
Humidity53%
Visibility—
Dew point38°
Mon, 1963° / 45°0
63 °
Eureka, Monday, 19 October
Overcast. High 63°, low 45°.
Pressure29.59 inHg
Wind3.6 mph SE
Humidity45%
Visibility—
Dew point35°
Tue, 2052° / 42°0.1
52 °
Eureka, Tuesday, 20 October
Light rain. High 52°, low 42°.
Pressure29.77 inHg
Wind5.5 mph S
Humidity95%
Visibility—
Dew point43°
Wed, 2146° / 39°0.02
46 °
Eureka, Wednesday, 21 October
Snow. High 46°, low 39°.
Pressure30.00 inHg
Wind3.8 mph S
Humidity80%
Visibility—
Dew point38°
Thu, 2245° / 36°0.04
45 °
Eureka, Thursday, 22 October
Snow. High 45°, low 36°.
Pressure29.94 inHg
Wind4.3 mph S
Humidity93%
Visibility—
Dew point40°
Fri, 2348° / 39°0.03
48 °
Eureka, Friday, 23 October
Snow. High 48°, low 39°.
Pressure30.33 inHg
Wind3.4 mph SW
Humidity71%
Visibility—
Dew point36°
Sat, 2448° / 35°0
48 °
Eureka, Saturday, 24 October
Overcast. High 48°, low 35°.
Pressure30.59 inHg
Wind3.6 mph S
Humidity71%
Visibility—
Dew point34°
Sun, 2552° / 41°0
52 °
Eureka, Sunday, 25 October
Overcast. High 52°, low 41°.
Pressure30.59 inHg
Wind3.5 mph NE
Humidity67%
Visibility—
Dew point37°
Mon, 2657° / 37°0
57 °
Eureka, Monday, 26 October
Clear. High 57°, low 37°.
Pressure30.59 inHg
Wind2.7 mph NE
Humidity67%
Visibility—
Dew point37°
Tue, 2761° / 38°0
61 °
Eureka, Tuesday, 27 October
Mostly clear. High 61°, low 38°.
Pressure30.42 inHg
Wind1.8 mph N
Humidity60%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2846° / 33°0.08
46 °
Eureka, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.08 in
Chance of precipitation48%
Record high60° (2017)
Record low1° (1971)
Thu, 2945° / 32°0.08
45 °
Eureka, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.08 in
Chance of precipitation32%
Record high62° (1974)
Record low1° (1991)
Fri, 3044° / 31°0.06
44 °
Eureka, Friday, 30 October
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.06 in
Chance of precipitation32%
Record high64° (1983)
Record low0° (1991)
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)
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.