Climate and monthly weather forecast
Sidney, MT

Weather in January

January, the same as December, in Sidney, Montana, is a freezing cold winter month, with an average temperature ranging between min 9.9°F (-12.3°C) and max 23.4°F (-4.8°C). With an average high-temperature of 23.4°F (-4.8°C) and an average low-temperature of 9.9°F (-12.3°C), January is the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Sidney, Montana, with an average temperature fluctuating between 23.9°F (-4.5°C) and 10.2°F (-12.1°C). In February, the average high-temperature is relatively the same as in January - a still freezing cold 23.9°F (-4.5°C). Weather in February »

Weather in March

March, the first month of the spring in Sidney, is a wintry month, with temperature in the range of an average low of 24.8°F (-4°C) and an average high of 39.7°F (4.3°C). In March, the average high-temperature soars, from a subzero cold 23.9°F (-4.5°C) in February, to a cold 39.7°F (4.3°C). Weather in March »

Weather in April

April in Sidney, Montana, is a cool spring month, with an average temperature fluctuating between 36.1°F (2.3°C) and 52.5°F (11.4°C). In Sidney, Montana, the average high-temperature in April rises from a wintry 39.7°F (4.3°C) in March to a cool 52.5°F (11.4°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Sidney, Montana, with an average temperature ranging between max 65.3°F (18.5°C) and min 46.8°F (8.2°C). In Sidney, the average high-temperature in May rises from a fresh 52.5°F (11.4°C) in April to an enjoyable 65.3°F (18.5°C). Weather in May »

Weather in June

June, the first month of the summer in Sidney, is a warm month, with temperature in the range of an average high of 75.7°F (24.3°C) and an average low of 56.3°F (13.5°C). In Sidney, Montana, the average high-temperature in June increases from a comfortable 65.3°F (18.5°C) in May to a warm 75.7°F (24.3°C). Weather in June »

Weather in July

July, like June, in Sidney, Montana, is a moderately hot summer month, with an average temperature fluctuating between 84.2°F (29°C) and 63°F (17.2°C). The warmest month is July, with an average high-temperature of 84.2°F (29°C) and an average low-temperature of 63°F (17.2°C). In July, the average heat index is computed to be 84.2°F (29°C). Weather in July »

Weather in August

August, the last month of the summer in Sidney, is also a moderately hot month, with an average temperature varying between 62.2°F (16.8°C) and 82.8°F (28.2°C). In Sidney, the average high-temperature in August is relatively the same as in July - a still warm 82.8°F (28.2°C). Weather in August »

Weather in September

September, the first month of the autumn in Sidney, is still a pleasant month, with temperature in the range of an average low of 54.3°F (12.4°C) and an average high of 72.3°F (22.4°C). In Sidney, the average high-temperature in September decreases from a warm 82.8°F (28.2°C) in August to an agreeable 72.3°F (22.4°C). Weather in September »

Weather in October

October, like September, in Sidney, Montana, is a cool autumn month, with an average temperature varying between 55°F (12.8°C) and 39.9°F (4.4°C). In Sidney, Montana, the average high-temperature in October declines considerably from a pleasant 72.3°F (22.4°C) in September to a fresh 55°F (12.8°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cold month in Sidney, Montana, with an average temperature fluctuating between 25.9°F (-3.4°C) and 39.4°F (4.1°C). In Sidney, the average high-temperature in November significantly decreases from a cool 55°F (12.8°C) in October to a wintry 39.4°F (4.1°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Sidney, Montana, with an average temperature ranging between max 24.6°F (-4.1°C) and min 12.7°F (-10.7°C). In December, the average high-temperature plummets from a wintry 39.4°F (4.1°C) in November to a subzero cold 24.6°F (-4.1°C). Weather in December »
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FAQ

What is the coldest month in Sidney?

The coldest month is January, with an average high-temperature of 23.4°F (-4.8°C) and an average low-temperature of 9.9°F (-12.3°C).

What is the most humid month in Sidney?

The most humid month in Sidney is January, with an average relative humidity of 87%.

What is the driest month in Sidney?

January is the month with the least rainfall in Sidney, Montana. Rain falls for 3.2 days and accumulates 0.24" (6mm) of precipitation.

How much does it rain in Sidney?

In Sidney, Montana, during the entire year, the rain falls for 85.7 days and collects up to 8.5" (216mm) of precipitation.

When does it snow in Sidney?

January through May, October through December are months with snowfall.

How many days does it snow in Sidney?

In Sidney, Montana, during the entire year, snow falls for 56.1 days and aggregates up to 8.94" (227mm) of snow.

When is the lowest UV index in Sidney?

The months with the lowest UV index in Sidney, Montana, are January and February, with an average maximum UV index of 1.

When does it snow the most in Sidney?

The month with the most snowfall in Sidney, Montana, is February, when snow falls for 12 days and typically aggregates up to 1.77" (45mm) of snow.

What is the month with the least sunshine in Sidney?

February has the least sunshine of the year in Sidney, with an average of 4.3h of sunshine.

When is Daylight Saving Time (DST) in Sidney?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Sidney, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from MDT to MST.

When it does not snow in Sidney?

June through September are months without snowfall in Sidney.

When are the longest days in Sidney?

The month with the longest days is June, with an average of 15h and 56min of daylight.

What is the warmest month in Sidney?

With an average high-temperature of 84.2°F (29°C) and an average low-temperature of 63°F (17.2°C), July is the warmest month in Sidney.

What is the rainiest month in Sidney?

July is the month with the most rainfall. Rain falls for 9.7 days and accumulates 1.34" (34mm) of precipitation.

What month has the most sunshine in Sidney?

With an average of 11.7h of sunshine, July has the most sunshine of the year in Sidney, Montana.

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

The month with the highest UV index in Sidney, Montana, is July, with an average maximum UV index of 7.

What is the least humid month in Sidney?

August is the least humid month in Sidney, Montana, with an average relative humidity of 45%.

What is the month with the shortest days in Sidney?

With an average of 8h and 29min of daylight, December has the shortest days of the year.

Average pressure
Sidney, MT

Average pressure - Sidney, MT

The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).

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Average wind speed
Sidney, MT

Average wind speed - Sidney, MT

The windiest months (with the highest average wind speed) are April and October (11.1mph).
The calmest month (with the lowest average wind speed) is February (9.2mph).

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Average rainfall
Sidney, MT

Average rainfall - Sidney, MT

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is January (0.24").

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Average rainfall days
Sidney, MT

Average rainfall days - Sidney, MT

The month with the highest number of rainy days is June (11.4 days).
The months with the least rainy days are January and February (3.2 days).

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Average snowfall
Sidney, MT

Average snowfall - Sidney, MT

The month with the highest snowfall is February (1.77").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Sidney, MT

Average snowfall days - Sidney, MT

The month with the highest number of snowfall days is February (12 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Sidney, MT

Average daylight / Average sunshine - Sidney, MT

The month with the longest days is June (Average daylight: 15h and 56min).
The month with the shortest days is December (Average daylight: 8h and 29min).

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

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Average sunshine days
Sidney, MT

Average sunshine days - Sidney, MT

The month with the most sunshine days is September (20.7 days).
The month with the least sunshine days is April (15.8 days).

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Average visibility
Sidney, MT

Average visibility - Sidney, MT

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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