April is one of the cooler months of the year in Missoula, with average highs near 8.3°C and lows around -3°C (mean 2.7°C). It is about average for rainfall, averaging 59 mm of rainfall and 77% relative humidity across the period.
April is one of the cooler months of the year in Missoula. Across 45 years of records, the warmest April in Missoula was 1987 — when the month averaged 6.6°C — while the coldest was 2008 at -1.9°C. Typical April days reach 8.3°C with nights near -3°C. The long-term trend is cooling, about 0.2°C per decade.
April is about average for rainfall in Missoula, averaging 59 mm of rainfall. The wettest Aprils on record were 1996 and 2018 with 98 mm, while the driest were 1999 and 2015 at 26 mm.
Relative humidity in Missoula during April averages 77%. The most humid April was 1997 at 87%, and the least humid was 1983 at 70%.
April receives about 4.5 kWh/m²/day of solar energy in Missoula. The sunniest April was 2021 at 5.4 kWh/m²/day, and the cloudiest was 2011 at 3.7.
Average wind speed in Missoula during April is 0.3 m/s. The windiest Aprils were 2021, 2022 and 2023, among others at 0.4 m/s, while the calmest were 2019, 2024 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 3.1°C | 2.8°C | 2.4°C | 2.6°C | 2.4°C | -0.7°C |
| Avg High | 9.1°C | 8.3°C | 8.1°C | 7.9°C | 8.2°C | -0.9°C |
| Avg Low | -2.9°C | -2.7°C | -3.3°C | -2.8°C | -3.4°C | -0.5°C |
| Avg Rain | 47 mm | 61 mm | 58 mm | 72 mm | 51 mm | +4 mm |
April temperatures in Missoula have risen by about 0.4°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -15.9°C (2009) to a record high of 25.3°C (1987).
Rainfall in April is about average for rainfall, averaging 59 mm, with a wettest year of 98 mm.
A good time to visit Missoula
April is a good time to visit Missoula, with days averaging 8.3°C and nights around -3°C (mean 2.7°C, cooler than Missoula's yearly average) and moderate rainfall. July and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 9.6°C | 3.6°C | -2.4°C | 17.3°C | -6.6°C | 46 mm | 76% | 0.3 m/s | 4.9 |
| 2024 | 10.0°C | 4.1°C | -1.8°C | 20.8°C | -5.9°C | 63 mm | 75% | 0.3 m/s | 4.6 |
| 2023 | 7.6°C | 2.1°C | -3.4°C | 23.8°C | -10.5°C | 42 mm | 76% | 0.4 m/s | 4.4 |
| 2022 | 5.1°C | 0.0°C | -5.2°C | 15.5°C | -13.5°C | 45 mm | 74% | 0.4 m/s | 4.2 |
| 2021 | 9.1°C | 2.9°C | -3.4°C | 18.8°C | -7.6°C | 38 mm | 73% | 0.4 m/s | 5.4 |
| 2020 | 7.6°C | 1.7°C | -4.3°C | 19.6°C | -13.2°C | 72 mm | 78% | 0.4 m/s | 5 |
| 2019 | 8.3°C | 3.2°C | -1.9°C | 17.3°C | -5.9°C | 89 mm | 80% | 0.3 m/s | 3.8 |
| 2018 | 6.5°C | 1.4°C | -3.7°C | 21.7°C | -11.9°C | 98 mm | 84% | 0.3 m/s | 4.2 |
| 2017 | 8.2°C | 3.0°C | -2.3°C | 14.4°C | -6.0°C | 73 mm | 80% | 0.3 m/s | 3.9 |
| 2016 | 12.8°C | 6.1°C | -0.6°C | 23.3°C | -4.6°C | 55 mm | 75% | 0.4 m/s | 4.9 |
| 2015 | 9.6°C | 3.6°C | -2.4°C | 20.8°C | -4.8°C | 26 mm | 73% | 0.4 m/s | 5 |
| 2014 | 6.2°C | 1.2°C | -3.7°C | 15.5°C | -9.9°C | 67 mm | 82% | 0.3 m/s | 4.7 |
| 2013 | 6.3°C | 1.1°C | -4.0°C | 15.6°C | -11.1°C | 74 mm | 79% | 0.3 m/s | 4.5 |
| 2012 | 10.3°C | 4.6°C | -1.2°C | 23.2°C | -6.4°C | 76 mm | 78% | 0.3 m/s | 4.4 |
| 2011 | 3.6°C | -0.7°C | -5.0°C | 9.3°C | -8.3°C | 83 mm | 84% | 0.3 m/s | 3.7 |
| 2010 | 7.4°C | 2.1°C | -3.2°C | 19.8°C | -9.5°C | 82 mm | 79% | 0.3 m/s | 4.2 |
| 2009 | 5.8°C | 0.6°C | -4.5°C | 15.9°C | -15.9°C | 54 mm | 82% | 0.4 m/s | 4.7 |
| 2008 ❄️ | 3.1°C | -1.9°C | -7.0°C | 14.2°C | -15.0°C | 47 mm | 86% | 0.4 m/s | 4.6 |
| 2007 | 9.0°C | 3.3°C | -2.5°C | 17.5°C | -8.1°C | 54 mm | 78% | 0.4 m/s | 4.6 |
| 2006 | 9.5°C | 3.9°C | -1.7°C | 18.5°C | -5.8°C | 86 mm | 77% | 0.3 m/s | 4.4 |
| 2005 | 9.2°C | 2.7°C | -3.7°C | 18.5°C | -10.3°C | 79 mm | 76% | 0.3 m/s | 4.5 |
| 2004 | 11.6°C | 5.1°C | -1.4°C | 18.9°C | -6.2°C | 47 mm | 72% | 0.4 m/s | 5.1 |
| 2003 | 9.3°C | 3.5°C | -2.2°C | 17.6°C | -6.2°C | 59 mm | 78% | 0.3 m/s | 4.2 |
| 2002 | 6.5°C | 1.1°C | -4.4°C | 12.9°C | -14.8°C | 53 mm | 78% | 0.3 m/s | 4.5 |
| 2001 | 7.1°C | 2.0°C | -3.2°C | 20.9°C | -8.6°C | 62 mm | 78% | 0.3 m/s | 4 |
| 2000 | 10.3°C | 4.0°C | -2.4°C | 20.0°C | -6.5°C | 43 mm | 76% | 0.4 m/s | 4.7 |
| 1999 | 7.4°C | 1.6°C | -4.3°C | 16.4°C | -12.9°C | 26 mm | 75% | 0.3 m/s | 4.7 |
| 1998 | 10.1°C | 4.4°C | -1.2°C | 20.6°C | -5.0°C | 47 mm | 72% | 0.4 m/s | 4.8 |
| 1997 | 4.2°C | -0.9°C | -6.1°C | 13.3°C | -15.5°C | 70 mm | 87% | 0.3 m/s | 4.4 |
| 1996 🌧️ | 8.2°C | 3.1°C | -2.0°C | 18.9°C | -4.6°C | 98 mm | 79% | 0.4 m/s | 4.2 |
| 1995 | 7.3°C | 2.0°C | -3.3°C | 13.1°C | -5.8°C | 50 mm | 77% | 0.3 m/s | 4.7 |
| 1994 | 10.5°C | 4.6°C | -1.4°C | 19.3°C | -5.6°C | 77 mm | 75% | 0.3 m/s | 4.3 |
| 1993 | 7.7°C | 2.6°C | -2.4°C | 14.9°C | -5.8°C | 68 mm | 79% | 0.3 m/s | 4.1 |
| 1992 | 10.6°C | 4.7°C | -1.3°C | 22.4°C | -5.9°C | 72 mm | 76% | 0.4 m/s | 4.3 |
| 1991 | 6.5°C | 1.8°C | -3.0°C | 15.3°C | -6.1°C | 40 mm | 79% | 0.3 m/s | 4.4 |
| 1990 | 10.7°C | 4.5°C | -1.8°C | 18.7°C | -5.9°C | 62 mm | 77% | 0.3 m/s | 4.7 |
| 1989 | 9.3°C | 3.1°C | -3.1°C | 20.3°C | -8.3°C | 56 mm | 76% | 0.4 m/s | 4.9 |
| 1988 | 11.4°C | 4.8°C | -1.9°C | 21.3°C | -5.8°C | 46 mm | 72% | 0.3 m/s | 4.3 |
| 1987 🔥 | 13.6°C | 6.6°C | -0.3°C | 25.3°C | -5.4°C | 32 mm | 72% | 0.4 m/s | 5.2 |
| 1986 | 8.4°C | 2.5°C | -3.4°C | 17.2°C | -7.0°C | 41 mm | 75% | 0.3 m/s | 4.4 |
| 1985 | 9.5°C | 3.7°C | -2.1°C | 19.3°C | -8.5°C | 38 mm | 76% | 0.4 m/s | 4.8 |
| 1984 | 7.4°C | 2.0°C | -3.5°C | 22.4°C | -6.2°C | 73 mm | 76% | 0.3 m/s | 4.3 |
| 1983 | 8.7°C | 2.7°C | -3.3°C | 16.7°C | -9.6°C | 31 mm | 70% | 0.3 m/s | — |
| 1982 | 4.8°C | -0.5°C | -5.9°C | 14.0°C | -15.1°C | 56 mm | 78% | 0.4 m/s | — |
| 1981 | 8.5°C | 2.8°C | -2.8°C | 21.6°C | -8.3°C | 47 mm | 76% | 0.3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 8.3°C with lows near -3°C (mean 2.7°C), based on 45 years of NASA POWER data.
April averages 59 mm of rainfall in Missoula, about average for rainfall. The wettest on record was 98 mm in 1996.
The hottest April reached 25.3°C in 1987. The coldest dipped to -15.9°C in 2009.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.4°C. Daytime highs moved from 7.8°C to 8.3°C and overnight lows from -3.5°C to -3.2°C over the same span.
April is one of the cooler months of the year in Missoula and about average for rainfall, so plan for around 8.3°C daytime highs and -3°C at night.
Not quite — April is the 6th coolest month in Missoula, averaging 2.7°C.
For April in Missoula, pack warm layers and a jacket for chilly mornings, with typical highs of 8.3°C and lows of -3°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 77% — quite humid.
Average wind speed in April is 0.3 m/s. The windiest April on record averaged 0.4 m/s (1982).
The wettest April on record was 1996 with 98 mm. On average, April sees 59 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
