As of 16:16 MDT

Weather in Eureka, MT

42°

Eureka, Sunday, 11 October, 16:16

Overcast. Feels like 38°. High 42°, low 36°.

Pressure29.97 inHg

Wind7 mph NW

Humidity55%

Visibility6.2 mi

Dew point28°

See detailed hourly forecast

Monthly outlook for Eureka, MT: average high 54.6°, average low 39.1°. That is 1.2° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 1.0 inches. The warmest day looks like 17 October (71.7°), the coolest 12 October (30°).

54.6°/39.1°

Average high / low

+1.2°

Above normal

2 / 5

Wet days / normal

0.2 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
11 October – 20 October	57°	53.8°	+1.7°
21 October – 30 October	50.5°	48.4°	+1.2°
31 October – 9 November	at normal	42.7°	—

October records over 66 years

84.2°2 October 1992All-time high

0.3°30 October 1991All-time low

Mon, 1246° / 30°

46 °

Eureka, Monday, 12 October

Partly cloudy. High 46°, low 30°.

Pressure30.12 inHg

Wind0.7 mph W

Humidity72%

Visibility6.2 mi

Dew point29°

Tue, 1355° / 34°

55 °

Eureka, Tuesday, 13 October

Clear. High 55°, low 34°.

Pressure30.18 inHg

Wind1.2 mph E

Humidity57%

Visibility6.2 mi

Dew point33°

Wed, 1458° / 40°

58 °

Eureka, Wednesday, 14 October

Partly cloudy. High 58°, low 40°.

Pressure30.21 inHg

Wind3.8 mph SE

Humidity50%

Visibility6.2 mi

Dew point34°

Thu, 1560° / 41°

60 °

Eureka, Thursday, 15 October

Partly cloudy. High 60°, low 41°.

Pressure30.59 inHg

Wind1.3 mph NW

Humidity72%

Visibility0.2 mi

Dew point41°

Fri, 1669° / 44°

69 °

Eureka, Friday, 16 October

Clear. High 69°, low 44°.

Pressure30.30 inHg

Wind6.2 mph SE

Humidity43%

Visibility—

Dew point36°

Sat, 1772° / 47°

72 °

Eureka, Saturday, 17 October

Overcast. High 72°, low 47°.

Pressure29.91 inHg

Wind8 mph SW

Humidity36%

Visibility—

Dew point35°

Sun, 1861° / 45°

61 °

Eureka, Sunday, 18 October

Partly cloudy. High 61°, low 45°.

Pressure29.97 inHg

Wind6.9 mph SW

Humidity35%

Visibility—

Dew point29°

Mon, 1959° / 42°

59 °

Eureka, Monday, 19 October

Overcast. High 59°, low 42°.

Pressure29.88 inHg

Wind3.1 mph N

Humidity41%

Visibility—

Dew point29°

Tue, 2048° / 43°

0.04

48 °

Eureka, Tuesday, 20 October

Light rain. High 48°, low 43°.

Pressure29.80 inHg

Wind6 mph S

Humidity94%

Visibility—

Dew point42°

Wed, 2149° / 41°

0.02

49 °

Eureka, Wednesday, 21 October

Light rain. High 49°, low 41°.

Pressure29.88 inHg

Wind6 mph S

Humidity79%

Visibility—

Dew point38°

Thu, 2246° / 41°

0.13

46 °

Eureka, Thursday, 22 October

Light rain. High 46°, low 41°.

Pressure30.21 inHg

Wind1.7 mph S

Humidity91%

Visibility—

Dew point40°

Fri, 2348° / 34°

48 °

Eureka, Friday, 23 October

Overcast. High 48°, low 34°.

Pressure30.65 inHg

Wind2.4 mph E

Humidity75%

Visibility—

Dew point35°

Sat, 2456° / 34°

56 °

Eureka, Saturday, 24 October

Mostly clear. High 56°, low 34°.

Pressure30.53 inHg

Wind2.8 mph SE

Humidity58%

Visibility—

Dew point33°

Sun, 2557° / 37°

57 °

Eureka, Sunday, 25 October

Partly cloudy. High 57°, low 37°.

Pressure30.39 inHg

Wind4.9 mph NE

Humidity52%

Visibility—

Dew point32°

Mon, 2647° / 37°

47 °

Eureka, Monday, 26 October

Overcast. High 47°, low 37°.

Pressure30.36 inHg

Wind2.3 mph E

Humidity53%

Visibility—

Dew point28°

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

Tue, 2747° / 34°

0.06

47 °

Eureka, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high47°

Average low34°

Average precipitation0.06 in

Chance of precipitation35%

Record high62° (1965)

Record low12° (1971)

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)

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.