May is one of the warmer months of the year in Bozeman, with average highs near 13.4°C and lows around -0.1°C (mean 6.7°C). It is a relatively wet time of year, averaging 86 mm of rainfall and 69% relative humidity across the period.
May is one of the warmer months of the year in Bozeman. Across 45 years of records, the warmest May in Bozeman was 2023 — when the month averaged 9.9°C — while the coldest was 2010 at 3°C. Typical May days reach 13.4°C with nights near -0.1°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Bozeman, averaging 86 mm of rainfall. The wettest May on record was 1981 with 172 mm, while the driest was 2001 at 24 mm.
Relative humidity in Bozeman during May averages 69%. The most humid May was 2018 at 78%, and the least humid was 2001 at 52%.
May receives about 5.7 kWh/m²/day of solar energy in Bozeman. The sunniest May was 2001 at 6.7 kWh/m²/day, and the cloudiest were 2008, 2015 and 2019 at 5.
Average wind speed in Bozeman during May is 0.7 m/s. The windiest Mays were 1986, 2001 and 2009, among others at 0.8 m/s, while the calmest were 2019, 2023 and 2025, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.6°C | 6.7°C | 6.9°C | 6.2°C | 6.8°C | +0.2°C |
| Avg High | 13.6°C | 13.6°C | 13.8°C | 12.6°C | 13.5°C | -0.1°C |
| Avg Low | -0.5°C | -0.1°C | 0.0°C | -0.2°C | 0.2°C | +0.7°C |
| Avg Rain | 88 mm | 88 mm | 76 mm | 91 mm | 89 mm | +1 mm |
May temperatures in Bozeman have risen by about 1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -11.2°C (2010) to a record high of 28.3°C (1987).
Rainfall in May is a relatively wet time of year, averaging 86 mm, with a wettest year of 172 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Bozeman
May is a good time to visit Bozeman, with days averaging 13.4°C and nights around -0.1°C (mean 6.7°C, warmer than Bozeman's yearly average) and higher rainfall. July and August are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.4°C | 8.3°C | 1.1°C | 27.2°C | -4.7°C | 77 mm | 69% | 0.6 m/s | 6 |
| 2024 | 11.0°C | 4.9°C | -1.2°C | 22.3°C | -6.6°C | 114 mm | 71% | 0.7 m/s | 5.5 |
| 2023 🔥 | 16.8°C | 9.9°C | 3.0°C | 23.0°C | -3.3°C | 51 mm | 70% | 0.6 m/s | 5.7 |
| 2022 | 10.3°C | 4.6°C | -1.2°C | 20.8°C | -6.6°C | 140 mm | 72% | 0.7 m/s | 5.1 |
| 2021 | 13.4°C | 6.2°C | -1.1°C | 22.5°C | -6.3°C | 81 mm | 67% | 0.7 m/s | 5.8 |
| 2020 | 13.9°C | 7.1°C | 0.3°C | 25.9°C | -4.4°C | 74 mm | 71% | 0.7 m/s | 5.8 |
| 2019 | 11.4°C | 5.6°C | -0.3°C | 19.8°C | -9.4°C | 64 mm | 76% | 0.6 m/s | 5 |
| 2018 | 15.0°C | 8.9°C | 2.8°C | 22.0°C | -2.2°C | 94 mm | 78% | 0.6 m/s | 5.5 |
| 2017 | 14.0°C | 7.0°C | -0.1°C | 22.6°C | -6.2°C | 59 mm | 69% | 0.7 m/s | 6.1 |
| 2016 | 13.0°C | 6.3°C | -0.4°C | 20.8°C | -8.3°C | 87 mm | 72% | 0.7 m/s | 5.4 |
| 2015 | 13.4°C | 6.9°C | 0.4°C | 21.7°C | -4.7°C | 107 mm | 74% | 0.6 m/s | 5 |
| 2014 | 14.2°C | 7.5°C | 0.8°C | 22.8°C | -6.4°C | 62 mm | 70% | 0.6 m/s | 6.1 |
| 2013 | 14.2°C | 7.4°C | 0.6°C | 24.7°C | -7.1°C | 93 mm | 68% | 0.6 m/s | 5.4 |
| 2012 | 12.3°C | 5.8°C | -0.8°C | 23.9°C | -7.3°C | 92 mm | 68% | 0.7 m/s | 5.7 |
| 2011 | 9.2°C | 3.7°C | -1.8°C | 16.6°C | -9.3°C | 117 mm | 77% | 0.7 m/s | 5.1 |
| 2010 ❄️ | 8.9°C | 3.0°C | -2.8°C | 20.2°C | -11.2°C | 135 mm | 76% | 0.7 m/s | 5.1 |
| 2009 | 13.9°C | 7.0°C | 0.1°C | 23.5°C | -9.5°C | 71 mm | 67% | 0.8 m/s | 6.4 |
| 2008 | 11.3°C | 5.3°C | -0.8°C | 22.2°C | -7.1°C | 118 mm | 75% | 0.7 m/s | 5 |
| 2007 | 15.0°C | 7.6°C | 0.3°C | 23.4°C | -6.1°C | 88 mm | 67% | 0.7 m/s | 6 |
| 2006 | 15.3°C | 7.9°C | 0.5°C | 24.7°C | -5.8°C | 55 mm | 65% | 0.7 m/s | 6.3 |
| 2005 | 12.9°C | 6.1°C | -0.6°C | 19.7°C | -8.1°C | 66 mm | 71% | 0.7 m/s | 5.4 |
| 2004 | 12.9°C | 6.3°C | -0.3°C | 21.6°C | -6.7°C | 95 mm | 66% | 0.7 m/s | 5.2 |
| 2003 | 13.3°C | 6.8°C | 0.3°C | 27.5°C | -6.5°C | 74 mm | 71% | 0.7 m/s | 5.8 |
| 2002 | 13.5°C | 6.3°C | -0.8°C | 25.9°C | -7.4°C | 78 mm | 61% | 0.7 m/s | 5.6 |
| 2001 | 16.7°C | 8.8°C | 0.8°C | 26.0°C | -6.4°C | 24 mm | 52% | 0.8 m/s | 6.7 |
| 2000 | 13.3°C | 6.9°C | 0.5°C | 21.0°C | -5.3°C | 95 mm | 69% | 0.7 m/s | 5.3 |
| 1999 | 11.7°C | 5.4°C | -0.9°C | 23.3°C | -6.9°C | 95 mm | 70% | 0.7 m/s | 5.8 |
| 1998 | 14.4°C | 7.1°C | -0.1°C | 21.6°C | -4.3°C | 60 mm | 66% | 0.7 m/s | 6.6 |
| 1997 | 13.9°C | 7.0°C | 0.1°C | 20.1°C | -7.3°C | 100 mm | 72% | 0.7 m/s | 6.2 |
| 1996 | 10.4°C | 4.7°C | -1.0°C | 15.6°C | -4.8°C | 143 mm | 77% | 0.6 m/s | 5.4 |
| 1995 | 11.0°C | 4.7°C | -1.5°C | 19.9°C | -7.8°C | 80 mm | 74% | 0.6 m/s | 5.9 |
| 1994 | 17.2°C | 9.7°C | 2.2°C | 24.8°C | -2.4°C | 52 mm | 60% | 0.7 m/s | 5.7 |
| 1993 | 16.1°C | 8.7°C | 1.4°C | 23.6°C | -5.2°C | 84 mm | 69% | 0.6 m/s | 6 |
| 1992 | 17.3°C | 9.3°C | 1.4°C | 24.8°C | -4.6°C | 65 mm | 56% | 0.7 m/s | 5.9 |
| 1991 | 11.9°C | 5.4°C | -1.1°C | 19.5°C | -8.2°C | 117 mm | 73% | 0.7 m/s | 5.2 |
| 1990 | 11.9°C | 5.1°C | -1.7°C | 21.0°C | -9.5°C | 85 mm | 69% | 0.7 m/s | 5.3 |
| 1989 | 13.4°C | 6.3°C | -0.8°C | 21.0°C | -4.4°C | 89 mm | 67% | 0.7 m/s | 5.5 |
| 1988 | 15.5°C | 7.7°C | 0.0°C | 24.5°C | -7.3°C | 100 mm | 63% | 0.7 m/s | 6.2 |
| 1987 | 17.4°C | 9.7°C | 2.0°C | 28.3°C | -4.2°C | 118 mm | 61% | 0.7 m/s | 5.5 |
| 1986 | 13.7°C | 6.4°C | -0.9°C | 26.3°C | -6.3°C | 62 mm | 65% | 0.8 m/s | 6 |
| 1985 | 16.7°C | 8.7°C | 0.7°C | 24.4°C | -7.8°C | 55 mm | 56% | 0.7 m/s | 6.2 |
| 1984 | 11.9°C | 5.3°C | -1.3°C | 24.5°C | -7.5°C | 61 mm | 70% | 0.8 m/s | 5.7 |
| 1983 | 11.2°C | 4.8°C | -1.6°C | 23.7°C | -8.5°C | 59 mm | 67% | 0.7 m/s | — |
| 1982 | 11.2°C | 4.6°C | -2.0°C | 20.8°C | -6.4°C | 78 mm | 71% | 0.7 m/s | — |
| 1981 🌧️ | 11.8°C | 5.7°C | -0.4°C | 21.3°C | -6.7°C | 172 mm | 77% | 0.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 13.4°C with lows near -0.1°C (mean 6.7°C), based on 45 years of NASA POWER data.
May averages 86 mm of rainfall in Bozeman, a relatively wet time of year. The wettest on record was 172 mm in 1981.
The hottest May reached 28.3°C in 1987. The coldest dipped to -11.2°C in 2010.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1°C. Daytime highs moved from 12.6°C to 13.4°C and overnight lows from -0.9°C to 0.1°C over the same span.
May is one of the warmer months of the year in Bozeman and a relatively wet time of year, so plan for around 13.4°C daytime highs and -0.1°C at night.
Not quite — May is the 8th coolest month in Bozeman, averaging 6.7°C.
For May in Bozeman, pack warm layers and a jacket for chilly mornings, with typical highs of 13.4°C and lows of -0.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 69% — moderately humid.
Average wind speed in May is 0.7 m/s. The windiest May on record averaged 0.8 m/s (1984).
The wettest May on record was 1981 with 172 mm. On average, May sees 86 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 Bozeman behaves each May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
