June is one of the warmer months of the year in Missoula, with average highs near 18.9°C and lows around 5.5°C (mean 12.2°C). It is a relatively wet time of year, averaging 75 mm of rainfall and 70% relative humidity across the period.
June is one of the warmer months of the year in Missoula. Across 45 years of records, the warmest June in Missoula was 2015 — when the month averaged 16.1°C — while the coldest was 1981 at 9.3°C. Typical June days reach 18.9°C with nights near 5.5°C. The long-term June temperature trend is broadly flat.
June is a relatively wet time of year in Missoula, averaging 75 mm of rainfall. The wettest June on record was 2020 with 195 mm, while the driest was 2019 at 28 mm.
Relative humidity in Missoula during June averages 70%. The most humid June was 2020 at 78%, and the least humid was 1985 at 59%.
June receives about 6.3 kWh/m²/day of solar energy in Missoula. The sunniest June was 2015 at 7.6 kWh/m²/day, and the cloudiest was 1993 at 4.9.
Average wind speed in Missoula during June is 0.2 m/s. The windiest Junes were 1996, 2015 and 2021, among others at 0.3 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.8°C | 11.6°C | 12.0°C | 12.1°C | 13.1°C | +0.3°C |
| Avg High | 20.0°C | 18.2°C | 18.6°C | 18.4°C | 19.7°C | -0.3°C |
| Avg Low | 5.6°C | 5.0°C | 5.3°C | 5.7°C | 6.5°C | +0.9°C |
| Avg Rain | 61 mm | 78 mm | 73 mm | 78 mm | 92 mm | +31 mm |
June temperatures in Missoula have risen by about 2°C between 1981–1985 and 2021–2025.
June has ranged from a record low of -4.3°C (1984) to a record high of 35.5°C (1988).
Rainfall in June is a relatively wet time of year, averaging 75 mm, with a wettest year of 195 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.3°C per decade, narrowing the gap between day and night.
One of the best times to visit Missoula
June is one of the best times to visit Missoula. Expect days averaging 18.9°C and nights around 5.5°C (mean 12.2°C) — warmer than Missoula's yearly average — with moderate rainfall (75 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 21.5°C | 14.5°C | 7.5°C | 31.0°C | 1.4°C | 46 mm | 61% | 0.2 m/s | 6.9 |
| 2024 | 19.5°C | 12.6°C | 5.7°C | 29.3°C | 0.7°C | 60 mm | 65% | 0.2 m/s | 6.6 |
| 2023 | 19.0°C | 13.1°C | 7.2°C | 25.9°C | 0.0°C | 111 mm | 74% | 0.2 m/s | 5.9 |
| 2022 | 18.0°C | 11.7°C | 5.4°C | 28.8°C | 1.8°C | 104 mm | 75% | 0.2 m/s | 5.7 |
| 2021 | 22.9°C | 15.3°C | 7.8°C | 34.2°C | -1.9°C | 35 mm | 65% | 0.3 m/s | 7.4 |
| 2020 🌧️ | 17.1°C | 11.2°C | 5.3°C | 26.4°C | -2.5°C | 195 mm | 78% | 0.2 m/s | 5.3 |
| 2019 | 18.2°C | 12.1°C | 6.0°C | 25.4°C | -0.9°C | 28 mm | 72% | 0.2 m/s | 6.6 |
| 2018 | 17.4°C | 11.4°C | 5.4°C | 22.9°C | -2.4°C | 107 mm | 75% | 0.2 m/s | 6.1 |
| 2017 | 19.3°C | 12.5°C | 5.8°C | 28.7°C | -0.1°C | 88 mm | 72% | 0.2 m/s | 6.6 |
| 2016 | 20.8°C | 13.7°C | 6.5°C | 28.7°C | 0.9°C | 37 mm | 65% | 0.2 m/s | 7.1 |
| 2015 🔥 | 22.8°C | 16.1°C | 9.4°C | 34.6°C | 3.6°C | 29 mm | 63% | 0.3 m/s | 7.6 |
| 2014 | 16.5°C | 10.6°C | 4.7°C | 22.9°C | 0.0°C | 89 mm | 75% | 0.2 m/s | 6.2 |
| 2013 | 18.8°C | 12.2°C | 5.7°C | 28.0°C | 0.6°C | 65 mm | 73% | 0.2 m/s | 6.6 |
| 2012 | 17.9°C | 11.3°C | 4.6°C | 26.7°C | -1.2°C | 83 mm | 74% | 0.2 m/s | 6 |
| 2011 | 16.1°C | 10.1°C | 4.0°C | 26.2°C | -2.2°C | 122 mm | 76% | 0.2 m/s | 5.4 |
| 2010 | 16.6°C | 10.7°C | 4.7°C | 27.6°C | -0.3°C | 129 mm | 76% | 0.2 m/s | 5.9 |
| 2009 | 17.9°C | 11.1°C | 4.3°C | 23.3°C | -3.0°C | 55 mm | 70% | 0.2 m/s | 6.4 |
| 2008 | 17.0°C | 10.6°C | 4.2°C | 31.0°C | -2.3°C | 81 mm | 71% | 0.2 m/s | 6.7 |
| 2007 | 19.7°C | 12.8°C | 6.0°C | 29.1°C | 1.9°C | 69 mm | 70% | 0.2 m/s | 6.6 |
| 2006 | 20.3°C | 13.8°C | 7.2°C | 28.6°C | 1.9°C | 79 mm | 70% | 0.2 m/s | 6.4 |
| 2005 | 16.6°C | 10.5°C | 4.4°C | 29.6°C | -0.9°C | 113 mm | 77% | 0.2 m/s | 5.5 |
| 2004 | 18.7°C | 12.0°C | 5.3°C | 25.9°C | -1.2°C | 56 mm | 70% | 0.2 m/s | 6.7 |
| 2003 | 19.7°C | 13.0°C | 6.2°C | 31.1°C | 0.4°C | 38 mm | 68% | 0.2 m/s | 7.1 |
| 2002 | 18.3°C | 12.1°C | 5.9°C | 29.6°C | 0.0°C | 96 mm | 73% | 0.2 m/s | 6.3 |
| 2001 | 18.0°C | 11.2°C | 4.3°C | 28.6°C | -2.6°C | 99 mm | 67% | 0.2 m/s | 6.2 |
| 2000 | 19.7°C | 12.4°C | 5.0°C | 28.2°C | -0.5°C | 41 mm | 66% | 0.2 m/s | 6.6 |
| 1999 | 17.1°C | 10.8°C | 4.5°C | 24.8°C | -1.2°C | 77 mm | 72% | 0.2 m/s | 5.8 |
| 1998 | 15.9°C | 10.1°C | 4.2°C | 24.5°C | -0.9°C | 127 mm | 76% | 0.2 m/s | 5.7 |
| 1997 | 17.6°C | 11.7°C | 5.9°C | 22.1°C | 1.4°C | 82 mm | 76% | 0.2 m/s | 5.9 |
| 1996 | 18.6°C | 11.7°C | 4.9°C | 27.6°C | -1.7°C | 65 mm | 71% | 0.3 m/s | 6.7 |
| 1995 | 18.3°C | 11.6°C | 4.8°C | 25.0°C | -1.0°C | 76 mm | 72% | 0.2 m/s | 5.4 |
| 1994 | 19.3°C | 12.1°C | 4.9°C | 29.3°C | -0.8°C | 54 mm | 63% | 0.2 m/s | 6.2 |
| 1993 | 17.0°C | 10.7°C | 4.4°C | 29.4°C | -0.2°C | 82 mm | 72% | 0.2 m/s | 4.9 |
| 1992 | 22.5°C | 15.4°C | 8.3°C | 30.4°C | 1.6°C | 75 mm | 62% | 0.2 m/s | 6.1 |
| 1991 | 16.8°C | 10.4°C | 4.1°C | 23.0°C | -1.0°C | 100 mm | 73% | 0.2 m/s | 5.4 |
| 1990 | 18.6°C | 11.5°C | 4.4°C | 31.0°C | -2.8°C | 42 mm | 71% | 0.2 m/s | 6.1 |
| 1989 | 19.8°C | 12.6°C | 5.5°C | 27.7°C | 0.9°C | 42 mm | 69% | 0.2 m/s | 6.6 |
| 1988 | 24.1°C | 16.0°C | 7.8°C | 35.5°C | 1.5°C | 44 mm | 62% | 0.2 m/s | 6.1 |
| 1987 | 22.2°C | 14.5°C | 6.9°C | 33.1°C | -2.4°C | 47 mm | 60% | 0.3 m/s | 6.6 |
| 1986 | 22.5°C | 15.1°C | 7.7°C | 30.8°C | 1.7°C | 74 mm | 65% | 0.3 m/s | 6.7 |
| 1985 | 20.1°C | 12.3°C | 4.5°C | 29.9°C | 0.9°C | 30 mm | 59% | 0.2 m/s | 6.8 |
| 1984 | 17.4°C | 10.7°C | 3.9°C | 29.9°C | -4.3°C | 67 mm | 71% | 0.2 m/s | 6.1 |
| 1983 | 18.5°C | 11.5°C | 4.4°C | 27.5°C | -0.5°C | 74 mm | 68% | 0.2 m/s | — |
| 1982 | 19.7°C | 13.1°C | 6.6°C | 26.6°C | -0.5°C | 74 mm | 73% | 0.2 m/s | — |
| 1981 ❄️ | 15.4°C | 9.3°C | 3.1°C | 25.9°C | 0.2°C | 93 mm | 74% | 0.2 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 18.9°C with lows near 5.5°C (mean 12.2°C), based on 45 years of NASA POWER data.
June averages 75 mm of rainfall in Missoula, a relatively wet time of year. The wettest on record was 195 mm in 2020.
The hottest June reached 35.5°C in 1988. The coldest dipped to -4.3°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2°C. Daytime highs moved from 18.2°C to 20.2°C and overnight lows from 4.5°C to 6.7°C over the same span.
June is one of the warmer months of the year in Missoula and a relatively wet time of year, so plan for around 18.9°C daytime highs and 5.5°C at night.
Not quite — June is the 10th coolest month in Missoula, averaging 12.2°C.
For June in Missoula, pack warm layers and a jacket for chilly mornings, with typical highs of 18.9°C and lows of 5.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 70% — moderately humid.
Average wind speed in June is 0.2 m/s. The windiest June on record averaged 0.3 m/s (1986).
The wettest June on record was 2020 with 195 mm. On average, June sees 75 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Missoula behaves each June, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for June specifically, along with year-by-year records and how the month has changed over the decades.
