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.
| 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 |
| 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.
| 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.
| 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.