May weather forecast
Big Sky, MT

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Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana
Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana

Weather in May

May arrives in Big Sky heralding the arrival of warmer temperatures. The landscape begins to shed its winter coverage, showcasing its vibrant spring flora. Rain becomes the preferred form of precipitation, replacing the snow that dominated the previous months. This shift in weather trends signifies the wrapping up of winter sports and the starting up of trekking, hiking, and other outdoor spring activities. The Big Sky in May dresses differently, wearing the colors of blossoming nature and the bright sunshine overhead.

Temperature

In Big Sky, the onset of May comes with an increased average high-temperature, moving from April's wintry 40.1°F (4.5°C) to a fresh 52°F (11.1°C). During the month of May, the nighttime temperature in Big Sky falls to an average of 30.6°F (-0.8°C).

Humidity

In May, the average relative humidity is 74%.

Rainfall

The wettest months in Big Sky are April and May, with an average 2.91" (74mm) of rainfall.

Snowfall

January through December are months with snowfall. In May, it is snowing for 13.5 days. Throughout May, 10.16" (258mm) of snow is accumulated. Throughout the year, there are 151.6 snowfall days, and 124.06" (3151mm) of snow is accumulated.

Daylight

The average length of the day in May in Big Sky, Montana, is 14h and 54min.
On the first day of the month, sunrise is at 6:12 am and sunset at 8:32 pm. On the last day of May, sunrise is at 5:40 am and sunset at 9:05 pm MDT.

Sunshine

In Big Sky, the average sunshine in May is 9.5h.

UV index

The average daily maximum UV index in May is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 3 during May translates into the following directions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Always opt for UVA and UVB-resistant sunglasses on radiant days. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
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Frequently asked questions

What is the usual temperature for Big Sky in May?

In Big Sky, in May, the average high-temperature is 52°F (11.1°C), and the average low-temperature is 30.6°F (-0.8°C).

What is the average humidity in May in Big Sky?

The average relative humidity in May in Big Sky is 74%.

What is the wettest month in Big Sky?

The wettest months in Big Sky, Montana, are April and May, with an average 2.91" (74mm) of rainfall.

How many days does it rain in May in Big Sky?

In May, in Big Sky, the rain falls for 16.3 days. Throughout May, 2.91" (74mm) of precipitation is accumulated.

How many days does it snow in May in Big Sky?

In Big Sky, in May, during 13.5 snowfall days, 10.16" (258mm) of snow is typically accumulated.

How many hours of daylight does Big Sky have in May?

The average day length in May in Big Sky, Montana, is 14h and 54min.

When is the sunrise / sunset in May in Big Sky?

On the first day of May, sunrise is at 6:12 am and sunset at 8:32 pm. On the last day of the month, sunrise is at 5:40 am and sunset at 9:05 pm MDT.

How many hours of sunshine does Big Sky have in May?

In Big Sky, Montana, the average sunshine duration in May is 9.5h.

How high is the UV index in May in Big Sky?

In May, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Big Sky, MT

Average temperature in May - Big Sky, MT
  • Average high temperature in May: 52°F

The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (22.5°F).

  • Average low temperature in May: 30.6°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 (7.9°F).

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Average pressure in May
Big Sky, MT

Average pressure in May - Big Sky, MT
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in May
Big Sky, MT

Average wind speed in May - Big Sky, MT
  • Average wind speed in May: 5mph

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in May
Big Sky, MT

Average humidity in May - Big Sky, MT
  • Average humidity in May: 74%

The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is August (51%).

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Average rainfall in May
Big Sky, MT

Average rainfall in May - Big Sky, MT
  • Average rainfall in May: 2.91"

The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is July (1.18").

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Average rainfall days in May
Big Sky, MT

Average rainfall days in May - Big Sky, MT
  • Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in May
Big Sky, MT

Average snowfall in May - Big Sky, MT
  • Average snowfall in May: 10.16"

The month with the highest snowfall is April (19.88").
The month with the least snowfall is August (0.08").

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Average snowfall days in May
Big Sky, MT

Average snowfall days in May - Big Sky, MT
  • Average snowfall days in May: 13.5 days

The month with the highest number of snowfall days is March (21 days).
The month with the least snowfall days is August (0.3 days).

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Average daylight in May /
Average sunshine in May
Big Sky, MT

Average daylight in May / Average sunshine in May - Big Sky, MT
  • Average daylight in May: 14h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in May: 9h and 3min

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

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Average sunshine days in May
Big Sky, MT

Average sunshine days in May - Big Sky, MT
  • Average sunshine days in May: 5.7 days

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is May (5.7 days).

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Average UV index in May
Big Sky, MT

Average UV index in May - Big Sky, MT
  • Average UV index in May: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).

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Average cloud cover in May
Big Sky, MT

Average cloud cover in May - Big Sky, MT
  • Average cloud cover in May: 40

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 17).

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Average visibility in May
Big Sky, MT

Average visibility in May - Big Sky, MT
  • Average visibility in May: 5mi

The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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Big Sky, Montana, USA

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