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Eureka, MT Weather Forecast

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Overcast

44°F

Updated	5:44 am
Feels Like	38°F
Humidity	95%
Wind	N 0 mph
Barometer	29.95 in
Dew Point	43°F

Overcast

7°C

Updated	5:44 am
Feels Like	3°C
Humidity	95%
Wind	N 0 km/h
Barometer	101.4 kPa
Dew Point	6°C

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Cloud Cover	100%
Wind Chill	44°F 7°C
Sunrise	7:16 AM
Sunset	7:55 PM
Moonrise	11:41 AM
Moonset	8:52 PM

Civil Twilight
6:40 AM to 7:12 AM
7:55 PM to 8:27 PM
Eureka MT Weather - Waxing Crescent Moon

Waxing Crescent Moon

Eureka Weather Forecast

TODAY	TONIGHT	TUESDAY	TUESDAY NIGHT	WEDNESDAY	WEDNESDAY NIGHT	THURSDAY	THURSDAY NIGHT	FRIDAY	FRIDAY NIGHT	SATURDAY	SATURDAY NIGHT

Rain	Chance of Rain	Chance of Rain	Chance of Rain	Patchy Fog	Clear	Mostly Sunny	Mostly Clear	Mostly Sunny	Mostly Clear	Mostly Sunny	Mostly Clear
Hi: 60°FHi: 16°C	Lo: 40°FLo: 4°C	Hi: 60°FHi: 16°C	Lo: 45°FLo: 7°C	Hi: 70°FHi: 21°C	Lo: 40°FLo: 4°C	Hi: 76°FHi: 24°C	Lo: 45°FLo: 7°C	Hi: 75°FHi: 24°C	Lo: 45°FLo: 7°C	Hi: 75°FHi: 24°C	Lo: 45°FLo: 7°C
POP: 50%	POP: 20%	POP: 40%	POP: 30%

POP = Probability of Precipitation.

Weather Outlook Updated: 1222 AM MDT Mon Sep 14 2026 Eureka, MT Weather - WeatherWorld.com

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Meteorlogic Glosserator
Instant definitions for any meteorological term.

Issued: 208 AM MDT Mon Sep 14 2026

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KEY MESSAGES:

Widespread rain showers, high elevation snow and breezy conditions today
Drying and warming conditions by mid-week.
Trending wetter late Thursday into Friday.

A low pressure system moving along the northwest Montana and Canadian border will slowly shift eastward today. This system is producing widespread rain showers across all of western Montana and north-central Idaho, with heavier showers focusing on northwest Montana and north-central Idaho today. Snow levels droppe...

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Weather 101: Term of the Day

Tsunami

A series of long-period waves (on the order of tens of minutes) that are usually generated by an impulsive disturbance that displaces massive amounts of water, such as an earthquake occurring on or near the sea floor. Underwater volcanic eruptions and landslides can also cause tsunami. The resultant waves much the same as waves propagating in a calm pond after a rock is tossed. While traveling in the deep oceans, tsunami have extremely long wavelengths, often exceeding 50 nm, with small amplitudes (a few tens of centimeters) and negligible wave steepness, which in the open ocean would cause nothing more than a gentle rise and fall for most vessels, and possibly go unnoticed. Tsunami travel at very high speeds, sometimes in excess of 400 knots. Across the open oceans, these high-speed waves lose very little energy. As tsunami reach the shallow waters near the coast, they begin to slow down while gradually growing steeper, due to the decreasing water depth. The building walls of destruction can become extremely large in height, reaching tens of meters 30 feet or more as they reach the shoreline. The effects can be further amplified where a bay, harbor, or lagoon funnels the waves as they move inland. Large tsunami have been known to rise to over 100 feet! The amount of water and energy contained in tsunami can have devastating effects on coastal areas.