May weather forecast
West Yellowstone, MT

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Weather in May

The temperature in May takes a significant leap with highs reaching an average of 49.8°F (9.9°C). It signals the start of a warmer season in West Yellowstone, Montana. Weather conditions become increasingly pleasant, with the last vestiges of the snowy season finally melting away. The change in climate heralds the blossoming of various plant species, covering the city with colors and fragrance, projecting the true essence of spring.

Temperature

West Yellowstone's May weather brings a rise in high-temperatures, moving from an icy 37.2°F (2.9°C) in April to a chilly 49.8°F (9.9°C). West Yellowstone records a mean low-temperature of 28.9°F (-1.7°C) in May.

Humidity

In May, the average relative humidity is 76%.

Rainfall

May is the month with the most rainfall in West Yellowstone. Rain falls for 17.4 days and accumulates 2.8" (71mm) of precipitation.

Snowfall

Months with snowfall in West Yellowstone are January through July, September through December. In May, in West Yellowstone, it is snowing for 10.3 days. Throughout May, 8.23" (209mm) of snow is accumulated. Throughout the year, there are 159.3 snowfall days, and 120.47" (3060mm) of snow is accumulated.

Daylight

The average length of the day in May is 14h and 50min.
On the first day of May, sunrise is at 6:13 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:42 am and sunset at 9:02 pm MDT.

Sunshine

In May, the average sunshine is 9.6h.

UV index

The average daily maximum UV index in May in West Yellowstone is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 3 in May interprets into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature in West Yellowstone?

In West Yellowstone, in May, the average high-temperature is 49.8°F (9.9°C), and the average low-temperature is 28.9°F (-1.7°C).

What is the average humidity in May in West Yellowstone?

The average relative humidity in May in West Yellowstone is 76%.

What is the wettest month in West Yellowstone?

The month with the most rainfall is May, when the rain falls for 17.4 days and typically aggregates up to 2.8" (71mm) of precipitation.

How many days does it rain in May in West Yellowstone?

In West Yellowstone, in May, during 17.4 rainfall days, 2.8" (71mm) of precipitation is typically accumulated.

How many days does it snow in May in West Yellowstone?

In West Yellowstone, in May, during 10.3 snowfall days, 8.23" (209mm) of snow is typically accumulated.

How many hours of daylight does West Yellowstone have in May?

In May, the average day length is 14h and 50min.

What time are sunrise and sunset in May in West Yellowstone?

On the first day of May, sunrise is at 6:13 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:42 am and sunset at 9:02 pm MDT.

How many hours of sunshine does West Yellowstone have in May?

The average sunshine duration in May in West Yellowstone is 9.6h.

What is the UV index reading in May in West Yellowstone?

In May, the average daily maximum UV index in West Yellowstone is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
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
West Yellowstone, MT

Average temperature in May - West Yellowstone, MT
  • Average high temperature in May: 49.8°F

The warmest month (with the highest average high temperature) is July (72.9°F).
The month with the lowest average high temperature is December (20.1°F).

  • Average low temperature in May: 28.9°F

The month with the highest average low temperature is August (43.7°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).

Average pressure in May
West Yellowstone, MT

Average pressure in May - West Yellowstone, MT
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in May
West Yellowstone, MT

Average wind speed in May - West Yellowstone, MT
  • Average wind speed in May: 6mph

The windiest month (with the highest average wind speed) is June (6.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

Average humidity in May
West Yellowstone, MT

Average humidity in May - West Yellowstone, MT
  • Average humidity in May: 76%

The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is August (50%).

Average rainfall in May
West Yellowstone, MT

Average rainfall in May - West Yellowstone, MT
  • Average rainfall in May: 2.8"

The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is July (0.91").

Average rainfall days in May
West Yellowstone, MT

Average rainfall days in May - West Yellowstone, MT
  • Average rainfall days in May: 17.4 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (2.2 days).

Average snowfall in May
West Yellowstone, MT

Average snowfall in May - West Yellowstone, MT
  • Average snowfall in May: 8.23"

The month with the highest snowfall is February (17.83").
The month with the least snowfall is August (0").

Average snowfall days in May
West Yellowstone, MT

Average snowfall days in May - West Yellowstone, MT
  • Average snowfall days in May: 10.3 days

The month with the highest number of snowfall days is March (24.4 days).
The months with the least snowfall days are July and August (0.2 days).

Average daylight in May /
Average sunshine in May
West Yellowstone, MT

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

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in May: 9h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 18min).

Average sunshine days in May
West Yellowstone, MT

Average sunshine days in May - West Yellowstone, MT
  • Average sunshine days in May: 5.5 days

The months with the most sunshine days are July and September (14.7 days).
The month with the least sunshine days is February (5.3 days).

Average UV index in May
West Yellowstone, MT

Average UV index in May - West Yellowstone, 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, February, March, April, October, November and December (UV index 1).

Average cloud cover in May
West Yellowstone, MT

Average cloud cover in May - West Yellowstone, MT
  • Average cloud cover in May: 39

The month with the most cloud cover is February (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 16).

Average visibility in May
West Yellowstone, MT

Average visibility in May - West Yellowstone, MT
  • Average visibility in May: 5mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).

West Yellowstone, Montana, USA

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