Missoula Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Missoula, Montana during each month of the year.

The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in Missoula, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Missoula, 2010 to 2019
High °F Low °F   High °C Low °C
32 18 January 0 -8
36 20 February 2 -7
49 27 March 9 -3
57 33 April 14 0
67 40 May 20 5
75 47 June 24 8
87 52 July 31 11
86 51 August 30 10
73 43 September 23 6
57 33 October 14 1
41 24 November 5 -4
31 18 December 0 -8
58 34 Year 14 1
30-year temperature averages for Missoula, 1991 to 2020
High °F Low °F   High °C Low °C
32 18 January 0 -8
37 21 February 3 -6
48 27 March 9 -3
56 32 April 13 0
66 40 May 19 4
73 46 June 23 8
85 52 July 30 11
84 50 August 29 10
73 42 September 23 6
56 32 October 13 0
40 25 November 4 -4
31 18 December -1 -8
57 34 Year 14 1

Days of Hot Weather in Missoula

While Missoula doesn't experience long periods of hot weather, its heat can get intense. Temperatures in the 90s Fahrenheit are mainly confined to July and August, with a day or two in June and September. Usually a couple of days in summer make it to 100 °F (38 °C) or more.

Number of days in Missoula of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 0 0 0
March 0 0 0
April 3 0 0
May 12 4 0
June 20 10 2
July 29 24 12
August 29 24 11
September 19 10 1
October 4 0 0
November 0 0 0
December 0 0 0
Year 117 73 27

How Often Missoula Has Cold Temperatures

Freezing temperatures at night are the norm in Missoula from October into April. Usually May and September also get a few nights of frost. The coldest nights of winter drop to 0 °F or below.

On an average of 43 days annually the thermometer here never rises above freezing. Days that chilly can occur anytime during October to March.

Days per month on average in Missoula when the minimum temperature drops to 32, 20 or 10 °F or below
  0 °F
-18 °C
10 °F
-12 °C
20 °F
-8 °C
January 3 7 16
February 1 4 11
March 0 1 4
April 0 0 1
May 0 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 2
November 1 2 8
December 2 6 17
Year 7 20 59
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

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