As of 10:46 MDT

Weather in Eureka, MT

57°

Eureka, Saturday, 17 October, 10:46

Overcast. Feels like 54°. High 62°, low 39°.

Pressure29.94 inHg

Wind11 mph SE

Humidity36%

Visibility6.2 mi

Dew point30°

See detailed hourly forecast

Monthly outlook for Eureka, MT: average high 52.4°, average low 38.4°. That is 1.8° above the climate normal for October. Precipitation is expected on 6 days (about 1.3 inches), against a normal of 6 days and 1.1 inches. The warmest day looks like 21 October (66.3°), the coolest 30 October (27.8°).

52.4°/38.4°

Average high / low

+1.8°

Above normal

6 / 6

Wet days / normal

1.3 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
17 October – 26 October	58.9°	51.5°	+4.1°
27 October – 5 November	41.5°	44.5°	-1.6°
6 November – 15 November	at normal	40.3°	—

October records over 66 years

84.2°2 October 1992All-time high

0.3°30 October 1991All-time low

Sun, 1858° / 33°

58 °

Eureka, Sunday, 18 October

Clear. High 58°, low 33°.

Pressure30.15 inHg

Wind1.1 mph NE

Humidity55%

Visibility6.2 mi

Dew point37°

Mon, 1960° / 38°

60 °

Eureka, Monday, 19 October

Overcast. High 60°, low 38°.

Pressure29.97 inHg

Wind2.1 mph NW

Humidity65%

Visibility0.8 mi

Dew point39°

Tue, 2063° / 46°

63 °

Eureka, Tuesday, 20 October

Clear. High 63°, low 46°.

Pressure30.09 inHg

Wind1.5 mph NW

Humidity62%

Visibility6.2 mi

Dew point41°

Wed, 2166° / 45°

66 °

Eureka, Wednesday, 21 October

Clear. High 66°, low 45°.

Pressure30.00 inHg

Wind4 mph E

Humidity51%

Visibility—

Dew point38°

Thu, 2266° / 47°

66 °

Eureka, Thursday, 22 October

Light rain. High 66°, low 47°.

Pressure29.83 inHg

Wind5.6 mph SE

Humidity52%

Visibility—

Dew point41°

Fri, 2360° / 46°

60 °

Eureka, Friday, 23 October

Overcast. High 60°, low 46°.

Pressure29.85 inHg

Wind4.2 mph NW

Humidity63%

Visibility—

Dew point42°

Sat, 2459° / 41°

59 °

Eureka, Saturday, 24 October

Overcast. High 59°, low 41°.

Pressure29.97 inHg

Wind4.5 mph SE

Humidity50%

Visibility—

Dew point34°

Sun, 2549° / 44°

0.25

49 °

Eureka, Sunday, 25 October

Light rain. High 49°, low 44°.

Pressure29.83 inHg

Wind3.3 mph NW

Humidity93%

Visibility—

Dew point43°

Mon, 2644° / 41°

0.09

44 °

Eureka, Monday, 26 October

Light rain. High 44°, low 41°.

Pressure29.71 inHg

Wind6.9 mph SE

Humidity89%

Visibility—

Dew point40°

Tue, 2742° / 39°

0.6

42 °

Eureka, Tuesday, 27 October

Snow. High 42°, low 39°.

Pressure29.59 inHg

Wind6.8 mph SE

Humidity88%

Visibility—

Dew point39°

Wed, 2842° / 34°

0.13

42 °

Eureka, Wednesday, 28 October

Snow. High 42°, low 34°.

Pressure29.91 inHg

Wind9.5 mph S

Humidity89%

Visibility—

Dew point36°

Thu, 2942° / 35°

0.14

42 °

Eureka, Thursday, 29 October

Snow. High 42°, low 35°.

Pressure29.80 inHg

Wind7 mph S

Humidity89%

Visibility—

Dew point36°

Fri, 3041° / 28°

0.11

41 °

Eureka, Friday, 30 October

Light snow. High 41°, low 28°.

Pressure29.97 inHg

Wind4.5 mph S

Humidity82%

Visibility—

Dew point31°

Sat, 3141° / 29°

41 °

Eureka, Saturday, 31 October

Overcast. High 41°, low 29°.

Pressure29.71 inHg

Wind5.2 mph S

Humidity80%

Visibility—

Dew point31°

Sun, 0142° / 30°

42 °

Eureka, Sunday, 1 November

Overcast. High 42°, low 30°.

Pressure29.91 inHg

Wind4.8 mph NW

Humidity84%

Visibility—

Dew point34°

From day 17 onward the outlook is built from 60-year climate statistics

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)

Sat, 1439° / 28°

0.1

39 °

Eureka, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high39°

Average low28°

Average precipitation0.1 in

Chance of precipitation43%

Record high60° (1999)

Record low6° (2014)

Sun, 1540° / 27°

0.06

40 °

Eureka, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high40°

Average low27°

Average precipitation0.06 in

Chance of precipitation32%

Record high57° (1999)

Record low8° (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.