May is one of the warmer months of the year in Billings, with average highs near 19.6°C and lows around 5.7°C (mean 12.7°C). It is a relatively wet time of year, averaging 72 mm of rainfall and 56% relative humidity across the period.
May is one of the warmer months of the year in Billings. Across 45 years of records, the warmest May in Billings was 2023 — when the month averaged 16.2°C — while the coldest was 2011 at 8.9°C. Typical May days reach 19.6°C with nights near 5.7°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Billings, averaging 72 mm of rainfall. The wettest May on record was 2011 with 197 mm, while the driest was 2001 at 11 mm.
Relative humidity in Billings during May averages 56%. The most humid May was 2011 at 71%, and the least humid was 2001 at 39%.
May receives about 5.8 kWh/m²/day of solar energy in Billings. The sunniest May was 1998 at 6.9 kWh/m²/day, and the cloudiest was 2011 at 4.6.
Average wind speed in Billings during May is 2.9 m/s. The windiest Mays were 2011 and 2024 at 3.4 m/s, while the calmest was 2023 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.9°C | 12.6°C | 12.8°C | 12.1°C | 13.0°C | +0.1°C |
| Avg High | 20.1°C | 19.8°C | 20.0°C | 18.6°C | 19.7°C | -0.4°C |
| Avg Low | 5.8°C | 5.5°C | 5.7°C | 5.5°C | 6.3°C | +0.5°C |
| Avg Rain | 76 mm | 60 mm | 62 mm | 93 mm | 71 mm | -5 mm |
May temperatures in Billings have risen by about 0.8°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5°C (2005) to a record high of 34.1°C (1984).
Rainfall in May is a relatively wet time of year, averaging 72 mm, with a wettest year of 197 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A good time to visit Billings
May is a good time to visit Billings, with days averaging 19.6°C and nights around 5.7°C (mean 12.7°C, warmer than Billings's yearly average) and moderate rainfall. August and July 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 | 21.6°C | 14.5°C | 7.5°C | 31.4°C | 2.1°C | 61 mm | 58% | 2.7 m/s | 6.1 |
| 2024 | 17.7°C | 11.4°C | 5.1°C | 27.7°C | -2.5°C | 116 mm | 59% | 3.4 m/s | 5.4 |
| 2023 🔥 | 23.1°C | 16.2°C | 9.2°C | 30.4°C | 3.2°C | 74 mm | 60% | 2.2 m/s | 5.7 |
| 2022 | 17.4°C | 11.1°C | 4.7°C | 27.0°C | -2.0°C | 67 mm | 56% | 3.1 m/s | 5.5 |
| 2021 | 18.6°C | 12.0°C | 5.5°C | 30.4°C | -1.3°C | 45 mm | 55% | 3 m/s | 5.8 |
| 2020 | 19.5°C | 12.7°C | 6.0°C | 32.5°C | 0.1°C | 60 mm | 58% | 3 m/s | 5.7 |
| 2019 | 16.0°C | 10.1°C | 4.2°C | 27.3°C | -3.8°C | 101 mm | 67% | 2.9 m/s | 4.8 |
| 2018 | 21.4°C | 15.0°C | 8.6°C | 29.9°C | 2.7°C | 128 mm | 67% | 2.5 m/s | 5.6 |
| 2017 | 21.1°C | 13.7°C | 6.3°C | 31.7°C | 0.4°C | 44 mm | 55% | 2.9 m/s | 6.1 |
| 2016 | 19.8°C | 12.9°C | 5.9°C | 30.3°C | -0.4°C | 66 mm | 55% | 3 m/s | 5.6 |
| 2015 | 18.1°C | 11.6°C | 5.2°C | 26.4°C | -1.8°C | 82 mm | 61% | 2.8 m/s | 4.9 |
| 2014 | 19.5°C | 12.6°C | 5.7°C | 33.3°C | -4.7°C | 57 mm | 62% | 2.5 m/s | 5.9 |
| 2013 | 20.3°C | 13.7°C | 7.1°C | 33.8°C | -4.5°C | 121 mm | 54% | 3 m/s | 5.5 |
| 2012 | 19.3°C | 12.1°C | 5.0°C | 30.8°C | 0.3°C | 52 mm | 51% | 3 m/s | 5.8 |
| 2011 ❄️ 🌧️ | 14.5°C | 8.9°C | 3.4°C | 23.2°C | -1.8°C | 197 mm | 71% | 3.4 m/s | 4.6 |
| 2010 | 16.3°C | 9.9°C | 3.5°C | 28.4°C | -4.5°C | 78 mm | 57% | 3.3 m/s | 5.3 |
| 2009 | 20.9°C | 13.2°C | 5.6°C | 33.5°C | -3.8°C | 21 mm | 52% | 3 m/s | 6.5 |
| 2008 | 17.6°C | 11.4°C | 5.2°C | 31.0°C | -0.5°C | 146 mm | 60% | 3.3 m/s | 5 |
| 2007 | 21.2°C | 13.8°C | 6.4°C | 32.4°C | 0.3°C | 117 mm | 57% | 3.1 m/s | 6 |
| 2006 | 21.9°C | 14.4°C | 7.0°C | 32.7°C | -1.6°C | 47 mm | 49% | 2.8 m/s | 6.4 |
| 2005 | 18.2°C | 11.4°C | 4.6°C | 28.1°C | -5.0°C | 80 mm | 61% | 2.9 m/s | 5.6 |
| 2004 | 18.8°C | 11.9°C | 5.1°C | 28.6°C | -4.3°C | 46 mm | 54% | 3.2 m/s | 5.5 |
| 2003 | 19.1°C | 12.6°C | 6.0°C | 33.3°C | -1.3°C | 56 mm | 57% | 2.7 m/s | 5.9 |
| 2002 | 19.3°C | 11.6°C | 3.9°C | 30.8°C | -4.5°C | 42 mm | 49% | 3.1 m/s | 5.8 |
| 2001 | 22.9°C | 14.8°C | 6.8°C | 33.4°C | -1.6°C | 11 mm | 39% | 3.3 m/s | 6.8 |
| 2000 | 20.1°C | 13.3°C | 6.5°C | 28.7°C | -0.7°C | 56 mm | 53% | 3.1 m/s | 5.5 |
| 1999 | 18.8°C | 12.0°C | 5.2°C | 31.5°C | -0.7°C | 44 mm | 54% | 2.9 m/s | 5.8 |
| 1998 | 21.9°C | 14.1°C | 6.3°C | 31.8°C | 0.7°C | 31 mm | 46% | 2.9 m/s | 6.9 |
| 1997 | 20.3°C | 12.9°C | 5.6°C | 31.3°C | -2.9°C | 54 mm | 56% | 2.7 m/s | 6.1 |
| 1996 | 15.4°C | 9.6°C | 3.7°C | 22.2°C | -2.3°C | 106 mm | 66% | 2.6 m/s | 5.1 |
| 1995 | 17.0°C | 10.3°C | 3.7°C | 27.5°C | -4.6°C | 94 mm | 63% | 2.5 m/s | 5.5 |
| 1994 | 23.0°C | 15.2°C | 7.4°C | 31.1°C | 1.8°C | 40 mm | 50% | 2.8 m/s | 6.3 |
| 1993 | 22.0°C | 14.5°C | 7.1°C | 30.4°C | 0.1°C | 28 mm | 52% | 2.7 m/s | 6.4 |
| 1992 | 22.7°C | 14.8°C | 6.9°C | 33.1°C | 1.1°C | 45 mm | 47% | 2.7 m/s | 6.1 |
| 1991 | 18.1°C | 11.5°C | 5.0°C | 26.8°C | -3.6°C | 95 mm | 64% | 2.8 m/s | 5.3 |
| 1990 | 18.3°C | 11.4°C | 4.5°C | 29.8°C | -2.9°C | 62 mm | 56% | 2.7 m/s | 5.7 |
| 1989 | 19.4°C | 12.1°C | 4.8°C | 28.7°C | -1.1°C | 65 mm | 59% | 3 m/s | 6 |
| 1988 | 23.0°C | 15.1°C | 7.2°C | 32.2°C | -1.2°C | 67 mm | 48% | 3.1 m/s | 6.2 |
| 1987 | 23.4°C | 16.1°C | 8.8°C | 33.1°C | 1.6°C | 101 mm | 51% | 2.7 m/s | 5.8 |
| 1986 | 20.0°C | 12.2°C | 4.4°C | 32.1°C | -2.0°C | 61 mm | 54% | 3.2 m/s | 6.2 |
| 1985 | 23.3°C | 15.5°C | 7.8°C | 31.8°C | -1.6°C | 36 mm | 44% | 2.7 m/s | 6.5 |
| 1984 | 19.1°C | 12.0°C | 5.0°C | 34.1°C | -2.6°C | 33 mm | 52% | 3 m/s | 5.6 |
| 1983 | 17.5°C | 10.9°C | 4.3°C | 29.5°C | -4.6°C | 57 mm | 55% | 2.9 m/s | — |
| 1982 | 17.1°C | 10.3°C | 3.6°C | 26.9°C | -1.6°C | 77 mm | 58% | 3.2 m/s | — |
| 1981 | 18.3°C | 12.2°C | 6.1°C | 30.2°C | 0.8°C | 187 mm | 65% | 2.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 19.6°C with lows near 5.7°C (mean 12.7°C), based on 45 years of NASA POWER data.
May averages 72 mm of rainfall in Billings, a relatively wet time of year. The wettest on record was 197 mm in 2011.
The hottest May reached 34.1°C in 1984. The coldest dipped to -5°C in 2005.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.8°C. Daytime highs moved from 19.1°C to 19.7°C and overnight lows from 5.4°C to 6.4°C over the same span.
May is one of the warmer months of the year in Billings and a relatively wet time of year, so plan for around 19.6°C daytime highs and 5.7°C at night.
Not quite — May is the 8th coolest month in Billings, averaging 12.7°C.
For May in Billings, pack warm layers and a jacket for chilly mornings, with typical highs of 19.6°C and lows of 5.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 56% — moderately humid.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 3.4 m/s (2011).
The wettest May on record was 2011 with 197 mm. On average, May sees 72 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 Billings 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.
