May is one of the warmer months of the year in Gallatin, with average highs near 23.9°C and lows around 13.5°C (mean 18.7°C). It is a relatively wet time of year, averaging 137 mm of rainfall and 80% relative humidity across the period.
May is one of the warmer months of the year in Gallatin. Across 45 years of records, the warmest May in Gallatin was 2018 — when the month averaged 22.1°C — while the coldest was 1997 at 16°C. Typical May days reach 23.9°C with nights near 13.5°C. The long-term trend is warming, about 0.4°C per decade.
May is a relatively wet time of year in Gallatin, averaging 137 mm of rainfall. The wettest May on record was 2010 with 310 mm, while the driest was 2005 at 47 mm.
Relative humidity in Gallatin during May averages 80%. The most humid Mays were 1991 and 2003 at 85%, and the least humid were 1988 and 2007 at 70%.
May receives about 5.7 kWh/m²/day of solar energy in Gallatin. The sunniest May was 2005 at 6.7 kWh/m²/day, and the cloudiest was 1990 at 4.8.
Average wind speed in Gallatin during May is 1.7 m/s. The windiest May was 1983 at 2.2 m/s, while the calmest were 1982, 1987 and 2012 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.0°C | 18.4°C | 18.7°C | 19.6°C | 18.8°C | +0.8°C |
| Avg High | 23.5°C | 23.6°C | 24.0°C | 24.6°C | 23.9°C | +0.4°C |
| Avg Low | 12.5°C | 13.1°C | 13.4°C | 14.6°C | 13.7°C | +1.2°C |
| Avg Rain | 145 mm | 129 mm | 134 mm | 134 mm | 151 mm | +6 mm |
May temperatures in Gallatin have risen by about 1.4°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 1.3°C (2020) to a record high of 32.5°C (2011).
Rainfall in May is a relatively wet time of year, averaging 137 mm, with a wettest year of 310 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
A good time to visit Gallatin
May is a good time to visit Gallatin, with days averaging 23.9°C and nights around 13.5°C (mean 18.7°C, warmer than Gallatin's yearly average) and higher rainfall. September and June 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 | 23.0°C | 18.6°C | 14.2°C | 27.2°C | 7.6°C | 181 mm | 83% | 1.7 m/s | 5 |
| 2024 | 25.5°C | 20.7°C | 15.9°C | 29.0°C | 10.2°C | 283 mm | 83% | 1.6 m/s | 5.3 |
| 2023 | 24.0°C | 18.6°C | 13.2°C | 28.1°C | 5.3°C | 113 mm | 80% | 1.5 m/s | 5.9 |
| 2022 | 25.3°C | 20.0°C | 14.7°C | 29.9°C | 7.7°C | 98 mm | 81% | 1.8 m/s | 6 |
| 2021 | 22.9°C | 17.3°C | 11.8°C | 29.6°C | 5.4°C | 119 mm | 78% | 1.7 m/s | 5.7 |
| 2020 | 22.6°C | 17.3°C | 12.1°C | 29.1°C | 1.3°C | 113 mm | 82% | 1.7 m/s | 5.6 |
| 2019 | 25.4°C | 20.6°C | 15.8°C | 30.1°C | 6.2°C | 74 mm | 82% | 1.6 m/s | 5.7 |
| 2018 🔥 | 26.9°C | 22.1°C | 17.3°C | 30.6°C | 8.3°C | 128 mm | 84% | 1.4 m/s | 6.1 |
| 2017 | 24.1°C | 18.8°C | 13.5°C | 29.3°C | 4.0°C | 164 mm | 80% | 1.9 m/s | 6 |
| 2016 | 23.0°C | 17.8°C | 12.7°C | 28.6°C | 4.4°C | 136 mm | 81% | 1.7 m/s | 5.6 |
| 2015 | 24.9°C | 19.7°C | 14.5°C | 28.1°C | 3.8°C | 73 mm | 80% | 1.6 m/s | 5.8 |
| 2014 | 24.5°C | 19.4°C | 14.2°C | 28.2°C | 6.1°C | 71 mm | 81% | 1.7 m/s | 6.2 |
| 2013 | 23.0°C | 18.2°C | 13.4°C | 28.3°C | 4.7°C | 134 mm | 82% | 1.7 m/s | 5.6 |
| 2012 | 26.3°C | 21.1°C | 16.0°C | 32.0°C | 7.7°C | 112 mm | 78% | 1.3 m/s | 6.3 |
| 2011 | 23.2°C | 18.3°C | 13.3°C | 32.5°C | 3.3°C | 138 mm | 84% | 1.7 m/s | 5.2 |
| 2010 🌧️ | 24.8°C | 20.1°C | 15.4°C | 28.9°C | 4.1°C | 310 mm | 84% | 1.8 m/s | 5.5 |
| 2009 | 22.8°C | 18.2°C | 13.5°C | 26.7°C | 3.8°C | 201 mm | 85% | 1.7 m/s | 5.1 |
| 2008 | 23.3°C | 17.7°C | 12.2°C | 28.6°C | 5.4°C | 136 mm | 79% | 2 m/s | 5.6 |
| 2007 | 26.2°C | 20.1°C | 14.0°C | 30.5°C | 6.2°C | 78 mm | 70% | 1.4 m/s | 6.6 |
| 2006 | 23.1°C | 17.8°C | 12.5°C | 31.9°C | 5.8°C | 111 mm | 81% | 1.6 m/s | 5.5 |
| 2005 | 23.0°C | 17.2°C | 11.4°C | 28.0°C | 3.2°C | 47 mm | 77% | 1.4 m/s | 6.7 |
| 2004 | 25.3°C | 20.8°C | 16.3°C | 28.8°C | 5.0°C | 188 mm | 84% | 1.8 m/s | 5.7 |
| 2003 | 23.3°C | 18.8°C | 14.3°C | 27.5°C | 8.0°C | 197 mm | 85% | 2.1 m/s | 4.9 |
| 2002 | 23.0°C | 17.4°C | 11.8°C | 28.5°C | 2.5°C | 132 mm | 81% | 1.9 m/s | 5.3 |
| 2001 | 24.7°C | 19.2°C | 13.7°C | 28.8°C | 8.0°C | 113 mm | 75% | 1.6 m/s | 6 |
| 2000 | 24.9°C | 19.5°C | 14.0°C | 28.8°C | 7.5°C | 136 mm | 79% | 2 m/s | 5.6 |
| 1999 | 24.5°C | 18.7°C | 12.9°C | 27.5°C | 8.1°C | 100 mm | 76% | 1.7 m/s | 6.6 |
| 1998 | 25.5°C | 20.6°C | 15.8°C | 30.2°C | 9.6°C | 119 mm | 82% | 1.6 m/s | 5.9 |
| 1997 ❄️ | 21.8°C | 16.0°C | 10.2°C | 27.7°C | 3.7°C | 153 mm | 79% | 2.1 m/s | 5.7 |
| 1996 | 24.8°C | 19.9°C | 15.0°C | 31.0°C | 4.4°C | 146 mm | 83% | 1.9 m/s | 6 |
| 1995 | 23.9°C | 18.8°C | 13.7°C | 27.6°C | 5.3°C | 208 mm | 81% | 1.9 m/s | 5.3 |
| 1994 | 22.0°C | 16.1°C | 10.2°C | 28.0°C | 3.1°C | 93 mm | 79% | 1.8 m/s | 6 |
| 1993 | 23.2°C | 18.1°C | 13.0°C | 28.2°C | 6.6°C | 111 mm | 81% | 1.6 m/s | 5.5 |
| 1992 | 22.3°C | 17.1°C | 11.8°C | 27.0°C | 3.5°C | 102 mm | 79% | 1.6 m/s | 5.5 |
| 1991 | 25.6°C | 21.3°C | 16.9°C | 29.5°C | 6.7°C | 127 mm | 85% | 1.4 m/s | 5.2 |
| 1990 | 22.2°C | 17.1°C | 11.9°C | 26.8°C | 5.2°C | 129 mm | 82% | 1.9 m/s | 4.8 |
| 1989 | 21.7°C | 16.2°C | 10.7°C | 29.2°C | 2.0°C | 129 mm | 79% | 1.9 m/s | 5.8 |
| 1988 | 24.3°C | 17.8°C | 11.3°C | 31.4°C | 5.8°C | 56 mm | 70% | 1.6 m/s | 6.5 |
| 1987 | 25.8°C | 20.8°C | 15.8°C | 29.4°C | 8.1°C | 85 mm | 81% | 1.3 m/s | 6.2 |
| 1986 | 24.6°C | 19.3°C | 13.9°C | 29.3°C | 2.3°C | 148 mm | 75% | 1.6 m/s | 5.3 |
| 1985 | 24.1°C | 18.7°C | 13.2°C | 29.6°C | 6.5°C | 78 mm | 79% | 1.8 m/s | 5.7 |
| 1984 | 21.8°C | 16.1°C | 10.4°C | 27.1°C | 4.4°C | 259 mm | 82% | 2 m/s | 5.5 |
| 1983 | 21.8°C | 16.5°C | 11.2°C | 25.6°C | 4.6°C | 299 mm | 83% | 2.2 m/s | — |
| 1982 | 25.4°C | 20.3°C | 15.1°C | 28.2°C | 8.1°C | 126 mm | 81% | 1.3 m/s | — |
| 1981 | 22.3°C | 16.5°C | 10.6°C | 27.2°C | 4.9°C | 125 mm | 78% | 1.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 23.9°C with lows near 13.5°C (mean 18.7°C), based on 45 years of NASA POWER data.
May averages 137 mm of rainfall in Gallatin, a relatively wet time of year. The wettest on record was 310 mm in 2010.
The hottest May reached 32.5°C in 2011. The coldest dipped to 1.3°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.4°C. Daytime highs moved from 23.1°C to 24.1°C and overnight lows from 12.1°C to 14°C over the same span.
May is one of the warmer months of the year in Gallatin and a relatively wet time of year, so plan for around 23.9°C daytime highs and 13.5°C at night.
Not quite — May is the 8th coolest month in Gallatin, averaging 18.7°C.
For May in Gallatin, pack light layers you can adjust through the day, with typical highs of 23.9°C and lows of 13.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 80% — quite humid.
Average wind speed in May is 1.7 m/s. The windiest May on record averaged 2.2 m/s (1983).
The wettest May on record was 2010 with 310 mm. On average, May sees 137 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 Gallatin 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.
