Climate and monthly weather forecast
Eureka, MT

Weather in January

January, like December, is another subzero cold winter month in Eureka, Montana, with an average temperature fluctuating between 14.2°F (-9.9°C) and 27.3°F (-2.6°C). In January, the average high-temperature is practically the same as in December - a still subzero cold 27.3°F (-2.6°C). Weather in January »

Weather in February

February, the last month of the winter in Eureka, is also a subzero cold month, with an average temperature fluctuating between 13.8°F (-10.1°C) and 28.8°F (-1.8°C). In Eureka, the average high-temperature in February is relatively the same as in January - a still freezing cold 28.8°F (-1.8°C). Weather in February »

Weather in March

March, the first month of the spring in Eureka, is a wintry month, with temperature in the range of an average high of 36.3°F (2.4°C) and an average low of 21.2°F (-6°C). In Eureka, Montana, the average high-temperature in March slightly increases from a subzero cold 28.8°F (-1.8°C) in February to a wintry 36.3°F (2.4°C). Weather in March »

Weather in April

April is a chilly spring month in Eureka, Montana, with an average temperature fluctuating between 46.4°F (8°C) and 27°F (-2.8°C). In Eureka, Montana, the average high-temperature in April rises from a cold 36.3°F (2.4°C) in March to a frosty 46.4°F (8°C). Weather in April »

Weather in May

May, the last month of the spring in Eureka, is a moderate month, with an average temperature fluctuating between 34.5°F (1.4°C) and 59.7°F (15.4°C). In Eureka, the average high-temperature in May increases from a frosty 46.4°F (8°C) in April to a moderate 59.7°F (15.4°C). Weather in May »

Weather in June

The first month of the summer, June, is an enjoyable month in Eureka, Montana, with temperature in the range of an average low of 40.5°F (4.7°C) and an average high of 66.6°F (19.2°C). In June, the average high-temperature marginally rises from a mild 59.7°F (15.4°C) in May to a comfortable 66.6°F (19.2°C). Weather in June »

Weather in July

July is a warm summer month in Eureka, Montana, with temperature in the range of an average high of 77.4°F (25.2°C) and an average low of 44.4°F (6.9°C). The warmest month is July, with an average high-temperature of 77.4°F (25.2°C) and an average low-temperature of 44.4°F (6.9°C). Weather in July »

Weather in August

August, the last month of the summer in Eureka, is also a moderately hot month, with an average temperature fluctuating between 45.1°F (7.3°C) and 77.2°F (25.1°C). In Eureka, the average high-temperature in August is essentially the same as in July - a still moderately hot 77.2°F (25.1°C). Weather in August »

Weather in September

September, the first month of the autumn in Eureka, is still a comfortable month, with an average temperature fluctuating between 65.8°F (18.8°C) and 38.7°F (3.7°C). In September, the average high-temperature decreases from a warm 77.2°F (25.1°C) in August to an enjoyable 65.8°F (18.8°C). Weather in September »

Weather in October

October, like September, is a frosty autumn month in Eureka, Montana, with an average temperature fluctuating between 49.1°F (9.5°C) and 30.6°F (-0.8°C). In Eureka, the average high-temperature in October significantly decreases from a comfortable 65.8°F (18.8°C) in September to a frosty 49.1°F (9.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Eureka, is also a wintry month, with an average temperature fluctuating between 34.7°F (1.5°C) and 22.1°F (-5.5°C). In Eureka, the average high-temperature in November declines considerably from a chilly 49.1°F (9.5°C) in October to a cold 34.7°F (1.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a subzero cold month in Eureka, Montana, with an average temperature ranging between max 25.5°F (-3.6°C) and min 13.1°F (-10.5°C). December is the coldest month, with an average high-temperature of 25.5°F (-3.6°C) and an average low-temperature of 13.1°F (-10.5°C). Weather in December »
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FAQ

What is the most humid month in Eureka?

With an average relative humidity of 95%, January is the most humid month.

How many days does it rain in Eureka?

In Eureka, during the entire year, the rain falls for 136.3 days and collects up to 15.35" (390mm) of precipitation.

When does it snow in Eureka?

Months with snowfall in Eureka, Montana, are January through May, September through December.

How much does it snow in Eureka?

In Eureka, during the entire year, snow falls for 110.7 days and aggregates up to 46.81" (1189mm) of snow.

What is the month with the least sunshine in Eureka?

January has the least sunshine of the year, with an average of 3.1h of sunshine.

What are the months with the lowest UV index in Eureka?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Eureka, Montana.

What is the snowiest month in Eureka?

The month with the most snowfall is February, when snow falls for 20.5 days and typically aggregates up to 10" (254mm) of snow.

What is the rainiest month in Eureka?

The month with the most rainfall is March, when the rain falls for 16.8 days and typically aggregates up to 1.85" (47mm) of precipitation.

When is Daylight Saving Time (DST) in Eureka?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from MDT to MST.

When it does not snow in Eureka?

In Eureka, Montana, snow does not fall in June through August.

When are the longest days in Eureka?

The month with the longest days in Eureka is June, with an average of 16h and 7min of daylight.

What is the warmest month in Eureka?

The warmest month in Eureka is July, with an average high-temperature of 77.4°F (25.2°C) and an average low-temperature of 44.4°F (6.9°C).

What is the month with the highest UV index in Eureka?

The month with the highest UV index in Eureka is July, with an average maximum UV index of 6.

What is the least humid month in Eureka?

August is the least humid month, with an average relative humidity of 55%.

What is the driest month in Eureka?

August is the month with the least rainfall. Rain falls for 6.1 days and accumulates 0.39" (10mm) of precipitation.

What month has the most sunshine in Eureka?

August has the most sunshine of the year in Eureka, with an average of 11.7h of sunshine.

What is the coldest month in Eureka?

December is the coldest month in Eureka, with an average high-temperature of 25.5°F (-3.6°C) and an average low-temperature of 13.1°F (-10.5°C).

What is the month with the shortest days in Eureka?

The month with the shortest days in Eureka is December, with an average of 8h and 20min of daylight.

Average temperature
Eureka, MT

Average temperature - Eureka, MT

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is December (25.5°F).

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).

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Average pressure
Eureka, MT

Average pressure - Eureka, MT

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed
Eureka, MT

Average wind speed - Eureka, MT

The windiest month (with the highest average wind speed) is June (4.4mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).

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Average rainfall
Eureka, MT

Average rainfall - Eureka, MT

The wettest month (with the highest rainfall) is March (1.85").
The driest month (with the least rainfall) is August (0.39").

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Average rainfall days
Eureka, MT

Average rainfall days - Eureka, MT

The month with the highest number of rainy days is April (17 days).
The month with the least rainy days is August (6.1 days).

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Average snowfall
Eureka, MT

Average snowfall - Eureka, MT

The month with the highest snowfall is February (10").
The months with the least snowfall are June, July and August (0").

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Average snowfall days
Eureka, MT

Average snowfall days - Eureka, MT

The month with the highest number of snowfall days is December (22.1 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight / Average sunshine
Eureka, MT

Average daylight / Average sunshine - Eureka, MT

The month with the longest days is June (Average daylight: 16h and 7min).
The month with the shortest days is December (Average daylight: 8h and 20min).

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).

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Average sunshine days
Eureka, MT

Average sunshine days - Eureka, MT

The month with the most sunshine days is August (21.6 days).
The month with the least sunshine days is March (6.3 days).

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