May weather forecast
Missoula, MT

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The scenic area surrounding the iconic Higgins Street Bridge in Missoula, Montana
The scenic area surrounding the iconic Higgins Street Bridge in Missoula, Montana

Weather in May

May signals the start of pleasant weather in Missoula, with an appreciable increase in daylight and sunshine hours. It precedes a warmer and drier June, with slightly higher relative humidity and rainfall levels in comparison. A near complete departure from snowfall is observed, distinguishing May from the preceding colder months. As the month progresses, a significant increase in temperature and daylight hours lays the groundwork for the upcoming summer season. Temperatures range from mild lows of 34.2°F (1.2°C) to highs of 60.3°F (15.7°C), a stark contrast from the cooler weather that characterized the winter months.

Temperature

In May, the meteorological conditions change with the average high-temperature moving from a frosty 47.8°F (8.8°C) in April to a refreshing 60.3°F (15.7°C). Missoula experiences a significant reduction from daytime highs with an average low-temperature of 34.2°F (1.2°C) in May.

Humidity

The average relative humidity in May is 68%.

Rainfall

In Missoula, in May, it is raining for 6.5 days, with typically 0.39" (10mm) of accumulated precipitation. Throughout the year, there are 67.5 rainfall days, and 3.27" (83mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Missoula are January through May, September through December. May is the last month it regularly snows in Missoula. During 0.8 snowfall days, in May, Missoula aggregates 0.04" (1mm) of snow. Throughout the year, there are 44 snowfall days, and 8.07" (205mm) of snow is accumulated.

Daylight

The average length of the day in May is 15h and 5min.
On the first day of May, sunrise is at 6:19 am and sunset at 8:46 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 9:22 pm MDT.

Sunshine

In May, the average sunshine in Missoula, Montana, is 10.3h.

UV index

In Missoula, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 4 in May interprets into the following advice:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Missoula in May?

In Missoula, 60.3°F (15.7°C) is the average high-temperature and 34.2°F (1.2°C) is the average low-temperature during May.

What is the average humidity in May in Missoula?

In Missoula, the average relative humidity in May is 68%.

How much does it rain in Missoula in May?

In Missoula, Montana, during May, the rain falls for 6.5 days and regularly aggregates up to 0.39" (10mm) of precipitation.

What is the last month it snows in Missoula?

May is the last month it regularly snows. During 0.8 snowfall days, in May, Missoula aggregates 0.04" (1mm) of snow.

How many hours of daylight does Missoula have in May?

The average day length in May is 15h and 5min.

When are sunrise and sunset in May in Missoula?

In May, on the first day of the month, sunrise is at 6:19 am and sunset at 8:46 pm. On the last day of the month, in Missoula, Montana, sunrise is at 5:45 am and sunset at 9:22 pm MDT.

How many hours of sunshine does Missoula have in May?

In May, the average sunshine duration is 10.3h.

What is the UV index reading in May in Missoula?

In May, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe 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
Missoula, MT

Average temperature in May - Missoula, MT
  • Average high temperature in May: 60.3°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (28°F).

  • Average low temperature in May: 34.2°F

The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (15.4°F).

Average pressure in May
Missoula, MT

Average pressure in May - Missoula, MT
  • Average pressure in May: 29.96"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in May
Missoula, MT

Average wind speed in May - Missoula, MT
  • Average wind speed in May: 4.5mph

The windiest month (with the highest average wind speed) is April (5mph).
The calmest month (with the lowest average wind speed) is August (4mph).

Average humidity in May
Missoula, MT

Average humidity in May - Missoula, MT
  • Average humidity in May: 68%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is July (50%).

Average rainfall in May
Missoula, MT

Average rainfall in May - Missoula, MT
  • Average rainfall in May: 0.39"

The wettest month (with the highest rainfall) is April (0.47").
The driest months (with the least rainfall) are July and December (0.16").

Average rainfall days in May
Missoula, MT

Average rainfall days in May - Missoula, MT
  • Average rainfall days in May: 6.5 days

The month with the highest number of rainy days is April (8.8 days).
The month with the least rainy days is August (3.3 days).

Average snowfall in May
Missoula, MT

Average snowfall in May - Missoula, MT
  • Average snowfall in May: 0.04"

The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July and August (0").

Average snowfall days in May
Missoula, MT

Average snowfall days in May - Missoula, MT
  • Average snowfall days in May: 0.8 days

The month with the highest number of snowfall days is December (9 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in May /
Average sunshine in May
Missoula, MT

Average daylight in May / Average sunshine in May - Missoula, MT
  • Average daylight in May: 15h and 1min

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

  • Average sunshine in May: 10h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in May
Missoula, MT

Average sunshine days in May - Missoula, MT
  • Average sunshine days in May: 20.7 days

The month with the most sunshine days is July (27 days).
The month with the least sunshine days is April (17.8 days).

Average UV index in May
Missoula, MT

Average UV index in May - Missoula, MT
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February and December (UV index 1).

Average cloud cover in May
Missoula, MT

Average cloud cover in May - Missoula, MT
  • Average cloud cover in May: 35

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 14).

Average visibility in May
Missoula, MT

Average visibility in May - Missoula, MT
  • Average visibility in May: 6mi

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

Missoula, Montana, USA

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