August 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 August

August maintains the warm and dry conditions that characterized July, making it another peak summer month in Missoula. The month displays a reduction in humidity relative to the more humid September, while boasting lower cloud cover and more sunshine hours and days. The absence of snowfall and low levels of rainfall solidify the summer atmosphere. The refreshing conditions of the month beckon outdoor enthusiasts to take advantage of the pleasant weather. Despite a minor decrease, temperatures remain high between 46.9°F (8.3°C) and 79.7°F (26.5°C), reinforcing the summer experience.

Temperature

The shift into August in Missoula reveals an average high-temperature of a still warm 79.7°F (26.5°C), closely mirroring July's climate. Missoula documents a substantial deviation from daytime highs with a consistent low-temperature of 46.9°F (8.3°C) during August nights.

Humidity

The average relative humidity in August is 51%.

Rainfall

In August, in Missoula, the rain falls for 3.3 days. Throughout August, 0.24" (6mm) of precipitation is accumulated. In Missoula, during the entire year, the rain falls for 67.5 days and collects up to 3.27" (83mm) of precipitation.

Snowfall

In Missoula, snow does not fall in June through August.

Daylight

In Missoula, the average length of the day in August is 14h and 9min.
On the first day of August, sunrise is at 6:16 am and sunset at 9:07 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 8:16 pm MDT.

Sunshine

In Missoula, the average sunshine in August is 11.6h.

UV index

In Missoula, the average daily maximum UV index in August is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: A typical high UV index of 4 in August suggests the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
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 August?

In Missoula, 79.7°F (26.5°C) is the average high-temperature and 46.9°F (8.3°C) is the average low-temperature during August.

What is the average humidity in August in Missoula?

In Missoula, the average relative humidity in August is 51%.

How many days does it rain in August in Missoula?

In Missoula, in August, it is raining for 3.3 days, with typically 0.24" (6mm) of accumulated precipitation.

When it does not snow in Missoula?

June through August are months without snowfall in Missoula, Montana.

Does it snow in Missoula in August?

In Missoula, Montana, in August, it doesn't snow. In September, it regularly snows.

How many hours of daylight does Missoula have in August?

The average day length in August is 14h and 9min.

When is the sunrise / sunset in August in Missoula?

In August, on the first day of the month, sunrise is at 6:16 am and sunset at 9:07 pm. On the last day of the month, in Missoula, sunrise is at 6:55 am and sunset at 8:16 pm MDT.

How many hours of sunshine does Missoula have in August?

In Missoula, the average sunshine duration in August is 11.6h.

How high is the UV index in August in Missoula?

The average daily maximum UV index in August is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Missoula, MT

Average temperature in August - Missoula, MT
  • Average high temperature in August: 79.7°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 August: 46.9°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 August
Missoula, MT

Average pressure in August - Missoula, MT
  • Average pressure in August: 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 August
Missoula, MT

Average wind speed in August - Missoula, MT
  • Average wind speed in August: 4mph

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 August
Missoula, MT

Average humidity in August - Missoula, MT
  • Average humidity in August: 51%

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

Average rainfall in August
Missoula, MT

Average rainfall in August - Missoula, MT
  • Average rainfall in August: 0.24"

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 August
Missoula, MT

Average rainfall days in August - Missoula, MT
  • Average rainfall days in August: 3.3 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 August
Missoula, MT

Average snowfall in August - Missoula, MT
  • Average snowfall in August: 0"

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 August
Missoula, MT

Average snowfall days in August - Missoula, MT
  • Average snowfall days in August: 0 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 August /
Average sunshine in August
Missoula, MT

Average daylight in August / Average sunshine in August - Missoula, MT
  • Average daylight in August: 14h 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 August: 11h and 4min

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 August
Missoula, MT

Average sunshine days in August - Missoula, MT
  • Average sunshine days in August: 25.6 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 August
Missoula, MT

Average UV index in August - Missoula, MT
  • Average UV index in August: 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 August
Missoula, MT

Average cloud cover in August - Missoula, MT
  • Average cloud cover in August: 15

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 August
Missoula, MT

Average visibility in August - Missoula, MT
  • Average visibility in August: 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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