As of 15:37 MDT

Weather in Eureka, MT

58°

Eureka, Sunday, 18 October, 15:37

Partly cloudy. Feels like 56°. High 58°, low 33°.

Pressure30.03 inHg

Wind1.3 mph SE

Humidity40%

Visibility2.7 mi

Dew point34°

See detailed hourly forecast

Monthly outlook for Eureka, MT: average high 47.1°, average low 33.2°. That is 0.7° below the climate normal for October. Precipitation is expected on 5 days (about 1.4 inches), against a normal of 6 days and 1.2 inches. The warmest day looks like 20 October (62°), the coolest 1 November (22.2°).

47.1°/33.2°

Average high / low

−0.7°

Below normal

5 / 6

Wet days / normal

1.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
18 October – 27 October	52.1°	50.8°	+0.8°
28 October – 6 November	38.8°	44°	-2.8°
7 November – 16 November	at normal	40°	—

October records over 66 years

84.2°2 October 1992All-time high

0.3°30 October 1991All-time low

Mon, 1962° / 34°

62 °

Eureka, Monday, 19 October

Overcast. High 62°, low 34°.

Pressure29.94 inHg

Wind1.5 mph NE

Humidity57%

Visibility—

Dew point38°

Tue, 2062° / 37°

62 °

Eureka, Tuesday, 20 October

Partly cloudy. High 62°, low 37°.

Pressure30.12 inHg

Wind2.4 mph NW

Humidity61%

Visibility0.1 mi

Dew point40°

Wed, 2161° / 42°

61 °

Eureka, Wednesday, 21 October

Partly cloudy. High 61°, low 42°.

Pressure30.03 inHg

Wind1.3 mph N

Humidity65%

Visibility—

Dew point41°

Thu, 2256° / 45°

0.19

56 °

Eureka, Thursday, 22 October

Rain. High 56°, low 45°.

Pressure29.80 inHg

Wind1.3 mph NW

Humidity76%

Visibility—

Dew point44°

Fri, 2349° / 42°

0.36

49 °

Eureka, Friday, 23 October

Rain. High 49°, low 42°.

Pressure29.91 inHg

Wind4.7 mph SW

Humidity85%

Visibility—

Dew point42°

Sat, 2449° / 35°

49 °

Eureka, Saturday, 24 October

Partly cloudy. High 49°, low 35°.

Pressure30.24 inHg

Wind5.7 mph SE

Humidity70%

Visibility—

Dew point34°

Sun, 2541° / 35°

0.16

41 °

Eureka, Sunday, 25 October

Snow. High 41°, low 35°.

Pressure30.18 inHg

Wind4.3 mph N

Humidity94%

Visibility—

Dew point39°

Mon, 2640° / 26°

40 °

Eureka, Monday, 26 October

Overcast. High 40°, low 26°.

Pressure30.33 inHg

Wind4 mph NW

Humidity66%

Visibility—

Dew point24°

Tue, 2742° / 28°

42 °

Eureka, Tuesday, 27 October

Overcast. High 42°, low 28°.

Pressure30.15 inHg

Wind4.9 mph NW

Humidity68%

Visibility—

Dew point26°

Wed, 2838° / 32°

0.65

38 °

Eureka, Wednesday, 28 October

Snow. High 38°, low 32°.

Pressure30.03 inHg

Wind2.6 mph N

Humidity90%

Visibility—

Dew point34°

Thu, 2938° / 30°

0.04

38 °

Eureka, Thursday, 29 October

Light snow. High 38°, low 30°.

Pressure30.24 inHg

Wind2.7 mph W

Humidity89%

Visibility—

Dew point33°

Fri, 3039° / 33°

39 °

Eureka, Friday, 30 October

Overcast. High 39°, low 33°.

Pressure30.18 inHg

Wind2.6 mph E

Humidity90%

Visibility—

Dew point34°

Sat, 3139° / 28°

39 °

Eureka, Saturday, 31 October

Overcast. High 39°, low 28°.

Pressure30.21 inHg

Wind5.4 mph NW

Humidity88%

Visibility—

Dew point35°

Sun, 0140° / 22°

40 °

Eureka, Sunday, 1 November

Overcast. High 40°, low 22°.

Pressure30.50 inHg

Wind2.5 mph SE

Humidity80%

Visibility—

Dew point28°

Mon, 0239° / 28°

0.02

39 °

Eureka, Monday, 2 November

Snow. High 39°, low 28°.

Pressure30.39 inHg

Wind5.5 mph NE

Humidity88%

Visibility—

Dew point34°

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

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)

Mon, 1639° / 28°

0.1

39 °

Eureka, Monday, 16 November

Climate normal for this date — 60-year average.

Average high39°

Average low28°

Average precipitation0.1 in

Chance of precipitation50%

Record high55° (2025)

Record low7° (1961)

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.