Missoula, MT Climate & Monthly Averages
The climate of Missoula
A 26°C spread between its warmest and coolest months puts Missoula among the more strongly seasonal places we cover. July averages 86°F (30°C) by day; January averages 35°F (2°C), with nights at 19°F (-7°C).
Climate quick facts
- Hottest month: July - highs near 86°F (30°C)
- Coldest month: January - highs near 35°F (2°C)
- Decade extremes (2015-2024): 103°F (40°C) high · -35°F (-37°C) low
- Wettest month: May (10 rainy days) · Sunniest: July (14.2 h sun/day)
- Climate type: semi-arid
- Annual swing: 26°C between the average warmest and coolest month · day to night: 12°C
- Snow: about 34 days a year
- Months averaging 30°C or hotter: 1
- Average humidity: 59%
Temperatures through the year
January bottoms out at 35°F (2°C) in daylight, 19°F (-7°C) after dark. Warmth peaks in July: highs of 86°F (30°C), lows of 59°F (15°C). Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 103°F (40°C) and the lowest daily minimum -35°F (-37°C). Sunshine averages 9.4 hours a day over the year, peaking in July at 14.2 hours.
Rain, sun and snow
Three of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is May through June. Relative humidity averages 59% across the year, drier than about 86% of the cities we track. Between the average July and the average January lie 26°C, a wider spread than roughly 87% of the cities we track. Snow falls on roughly 34 days a year, mostly October through April.
How Missoula compares
- Missoula averages 47°F (9°C) across the year - cooler than all but 5% of the 3496 cities we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 35° | 19° | 10 | 1.5 in | 5.7 h/day | 72% |
| February | 37° | 20° | 12 | 2.0 in | 6.5 h/day | 68% |
| March | 47° | 28° | 10 | 1.6 in | 8.9 h/day | 62% |
| April | 56° | 34° | 10 | 1.8 in | 10.3 h/day | 57% |
| May | 66° | 43° | 10 | 2.2 in | 11.8 h/day | 58% |
| June | 75° | 51° | 8 | 1.8 in | 12.9 h/day | 53% |
| July | 86° | 59° | 2 | 0.5 in | 14.2 h/day | 39% |
| August | 85° | 58° | 3 | 0.7 in | 12.5 h/day | 41% |
| September | 73° | 48° | 6 | 1.5 in | 10.3 h/day | 53% |
| October | 58° | 37° | 10 | 2.0 in | 8.1 h/day | 63% |
| November | 44° | 28° | 10 | 1.8 in | 6.2 h/day | 67% |
| December | 36° | 22° | 12 | 2.0 in | 4.9 h/day | 70% |
Missoula month by month
Missoula weather in January
January brings highs around 35°F (2°C), lows near 19°F (-7°C), about 10 wet days and roughly 7 snowy days - typically the coldest month of the year in Missoula.
Missoula weather in February
February brings highs around 37°F (3°C), lows near 20°F (-7°C), about 12 wet days and roughly 7 snowy days.
Missoula weather in March
March brings highs around 47°F (8°C), lows near 28°F (-2°C), about 10 wet days and roughly 4 snowy days.
Missoula weather in April
April brings highs around 56°F (13°C), lows near 34°F (1°C), about 10 wet days and roughly 3 snowy days.
Missoula weather in May
May brings highs around 66°F (19°C), lows near 43°F (6°C), about 10 wet days - typically the wettest month of the year in Missoula.
Missoula weather in June
June brings highs around 75°F (24°C), lows near 51°F (11°C), about 8 wet days.
Missoula weather in July
July brings highs around 86°F (30°C), lows near 59°F (15°C), about 2 wet days - typically the hottest month and the driest month and the sunniest month of the year in Missoula.
Missoula weather in August
August brings highs around 85°F (29°C), lows near 58°F (14°C), about 3 wet days.
Missoula weather in September
September brings highs around 73°F (23°C), lows near 48°F (9°C), about 6 wet days.
Missoula weather in October
October brings highs around 58°F (14°C), lows near 37°F (3°C), about 10 wet days and roughly 1 snowy days.
Missoula weather in November
November brings highs around 44°F (6°C), lows near 28°F (-2°C), about 10 wet days and roughly 4 snowy days.
Missoula weather in December
December brings highs around 36°F (2°C), lows near 22°F (-6°C), about 12 wet days and roughly 8 snowy days.
Seasons in Missoula
Spring (March through May)
Spring stays on the cool side of mild here - highs near 56°F (14°C), nights near 35°F (2°C), and expect showers on roughly 30 days across the season, plus about 7 snowy days. Daylight is generous - around 10.3 hours of sun a day.
Summer (June through August)
Summer in Missoula brings hot afternoons, with daytime highs averaging 82°F (28°C) and nights around 56°F (13°C); rain comes on about 14 days over the three months. Daylight is generous - around 13.2 hours of sun a day.
Fall (September through November)
Fall in Missoula runs cool rather than cold, with daytime highs averaging 58°F (15°C) and nights around 38°F (3°C); expect showers on roughly 26 days across the season, plus about 6 snowy days.
Winter (December through February)
Through winter, Missoula brings deep cold: 36°F (2°C) by day, 20°F (-7°C) after dark, and rain falls on around 34 of the 90 days, plus about 22 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Climate questions, answered
Does it rain a lot in Missoula?
Does it freeze in Missoula?
Is Missoula hot in summer?
Is Missoula warmer or cooler than most cities?
Best time to visit Missoula
Aim for April to September if you get the choice: temperatures sit either side of the peak heat rather than in it, and highs average 73°F (23°C) against roughly 6 wet days a month. For the same question asked the other way round, see where else is warm in April.
Pack for Missoula with light clothing for the warm months, a heavy insulated coat, hat and gloves for winter and a compact umbrella or rain shell. July nights average 59°F (15°C), so evenings rarely match the afternoons.
Missoula temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.