May is one of the warmer months of the year in Butler, with average highs near 20.6°C and lows around 8.5°C (mean 14.6°C). It is a relatively wet time of year, averaging 98 mm of rainfall and 78% relative humidity across the period.
May is one of the warmer months of the year in Butler. Across 45 years of records, the warmest May in Butler was 2018 — when the month averaged 18.5°C — while the coldest was 1997 at 10.4°C. Typical May days reach 20.6°C with nights near 8.5°C. The long-term trend is warming, about 0.4°C per decade.
May is a relatively wet time of year in Butler, averaging 98 mm of rainfall. The wettest May on record was 1989 with 176 mm, while the driest was 2023 at 39 mm.
Relative humidity in Butler during May averages 78%. The most humid May was 2011 at 85%, and the least humid was 2023 at 71%.
May receives about 5.3 kWh/m²/day of solar energy in Butler. The sunniest May was 2007 at 6.6 kWh/m²/day, and the cloudiest were 1984 and 1989 at 4.2.
Average wind speed in Butler during May is 0.1 m/s. The windiest Mays were 2022, 2023 and 2024, among others at 0.1 m/s, while the calmest were 2019, 2020 and 2025, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.9°C | 13.8°C | 14.2°C | 16.0°C | 14.7°C | +0.8°C |
| Avg High | 20.0°C | 19.9°C | 20.4°C | 21.9°C | 20.6°C | +0.6°C |
| Avg Low | 7.9°C | 7.7°C | 8.0°C | 10.0°C | 8.8°C | +0.9°C |
| Avg Rain | 112 mm | 91 mm | 99 mm | 96 mm | 92 mm | -21 mm |
May temperatures in Butler have risen by about 1.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.2°C (2020) to a record high of 33.3°C (2006).
Rainfall in May is a relatively wet time of year, averaging 98 mm, with a wettest year of 176 mm.
A good time to visit Butler
May is a good time to visit Butler, with days averaging 20.6°C and nights around 8.5°C (mean 14.6°C, warmer than Butler's yearly average) and higher 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 | 19.9°C | 14.5°C | 9.1°C | 27.1°C | -0.3°C | 136 mm | 81% | 0 m/s | 4.7 |
| 2024 | 23.1°C | 17.4°C | 11.6°C | 29.3°C | 4.5°C | 102 mm | 79% | 0.1 m/s | 5.5 |
| 2023 | 20.5°C | 13.8°C | 7.1°C | 28.5°C | 0.9°C | 39 mm | 71% | 0.1 m/s | 6.1 |
| 2022 | 21.8°C | 15.9°C | 10.1°C | 29.1°C | 1.9°C | 123 mm | 80% | 0.1 m/s | 5.4 |
| 2021 | 20.1°C | 13.8°C | 7.6°C | 29.0°C | -2.0°C | 85 mm | 73% | 0.1 m/s | 5.3 |
| 2020 | 18.1°C | 12.6°C | 7.1°C | 28.7°C | -5.2°C | 65 mm | 79% | 0 m/s | 5.3 |
| 2019 | 21.9°C | 16.1°C | 10.3°C | 27.6°C | 3.6°C | 116 mm | 83% | 0 m/s | 5 |
| 2018 🔥 | 24.3°C | 18.5°C | 12.6°C | 32.3°C | 1.9°C | 87 mm | 82% | 0.1 m/s | 5.3 |
| 2017 | 19.5°C | 14.0°C | 8.5°C | 27.0°C | -2.5°C | 129 mm | 79% | 0.1 m/s | 5 |
| 2016 | 20.1°C | 14.5°C | 8.8°C | 29.4°C | -0.7°C | 61 mm | 79% | 0.1 m/s | 5.1 |
| 2015 | 23.8°C | 17.3°C | 10.8°C | 29.2°C | 0.5°C | 79 mm | 76% | 0.1 m/s | 5.9 |
| 2014 | 20.8°C | 14.7°C | 8.6°C | 26.8°C | -0.4°C | 94 mm | 79% | 0.1 m/s | 5.2 |
| 2013 | 21.2°C | 15.1°C | 9.0°C | 28.5°C | -1.3°C | 49 mm | 77% | 0 m/s | 5.8 |
| 2012 | 24.1°C | 17.8°C | 11.4°C | 30.0°C | 1.8°C | 91 mm | 78% | 0.1 m/s | 5.8 |
| 2011 | 21.0°C | 15.7°C | 10.5°C | 29.8°C | -0.3°C | 134 mm | 85% | 0 m/s | 4.8 |
| 2010 | 22.2°C | 16.0°C | 9.8°C | 30.4°C | -1.4°C | 120 mm | 79% | 0.1 m/s | 5.4 |
| 2009 | 20.4°C | 14.5°C | 8.6°C | 26.8°C | -0.8°C | 83 mm | 76% | 0.1 m/s | 5.4 |
| 2008 | 18.2°C | 12.2°C | 6.2°C | 26.1°C | 1.6°C | 88 mm | 78% | 0.1 m/s | 4.9 |
| 2007 | 22.9°C | 15.5°C | 8.2°C | 31.0°C | 1.6°C | 52 mm | 74% | 0.1 m/s | 6.6 |
| 2006 | 20.0°C | 13.8°C | 7.6°C | 33.3°C | -0.6°C | 106 mm | 77% | 0.1 m/s | 5.3 |
| 2005 | 18.2°C | 12.3°C | 6.3°C | 25.7°C | -1.8°C | 66 mm | 77% | 0.1 m/s | 5.5 |
| 2004 | 22.9°C | 16.9°C | 10.8°C | 27.9°C | -2.4°C | 145 mm | 82% | 0 m/s | 5.2 |
| 2003 | 19.2°C | 13.8°C | 8.4°C | 24.4°C | 2.6°C | 154 mm | 82% | 0 m/s | 4.3 |
| 2002 | 19.1°C | 12.5°C | 6.0°C | 26.2°C | -2.0°C | 124 mm | 77% | 0.1 m/s | 5.2 |
| 2001 | 21.3°C | 14.9°C | 8.5°C | 28.7°C | 1.2°C | 80 mm | 73% | 0.1 m/s | 5.3 |
| 2000 | 21.9°C | 15.6°C | 9.4°C | 27.7°C | 1.9°C | 95 mm | 77% | 0 m/s | 5.2 |
| 1999 | 22.3°C | 15.4°C | 8.5°C | 28.9°C | 4.4°C | 72 mm | 73% | 0.1 m/s | 6.3 |
| 1998 | 22.6°C | 16.7°C | 10.9°C | 32.6°C | 4.0°C | 72 mm | 80% | 0.1 m/s | 5.7 |
| 1997 ❄️ | 16.3°C | 10.4°C | 4.5°C | 24.3°C | -0.8°C | 127 mm | 78% | 0 m/s | 5.5 |
| 1996 | 18.9°C | 13.2°C | 7.5°C | 27.7°C | -2.1°C | 106 mm | 81% | 0.1 m/s | 4.7 |
| 1995 | 19.1°C | 13.3°C | 7.6°C | 24.9°C | -0.2°C | 165 mm | 79% | 0.1 m/s | 5 |
| 1994 | 17.9°C | 11.5°C | 5.0°C | 26.2°C | -0.8°C | 62 mm | 77% | 0.1 m/s | 5.3 |
| 1993 | 20.6°C | 14.1°C | 7.5°C | 29.3°C | 2.5°C | 50 mm | 76% | 0.1 m/s | 5.4 |
| 1992 | 19.8°C | 13.2°C | 6.5°C | 27.4°C | 0.3°C | 59 mm | 76% | 0.1 m/s | 5.6 |
| 1991 | 23.9°C | 18.0°C | 12.0°C | 29.7°C | 3.1°C | 60 mm | 79% | 0.1 m/s | 5.8 |
| 1990 | 17.9°C | 12.3°C | 6.7°C | 23.0°C | 1.4°C | 138 mm | 80% | 0 m/s | 4.6 |
| 1989 🌧️ | 17.4°C | 12.5°C | 7.6°C | 26.0°C | 0.5°C | 176 mm | 83% | 0 m/s | 4.2 |
| 1988 | 21.2°C | 14.7°C | 8.1°C | 29.2°C | 0.6°C | 80 mm | 76% | 0.1 m/s | 5.6 |
| 1987 | 22.2°C | 15.5°C | 8.8°C | 29.0°C | -1.0°C | 87 mm | 78% | 0.1 m/s | 5.8 |
| 1986 | 20.7°C | 14.6°C | 8.6°C | 27.0°C | -3.5°C | 77 mm | 79% | 0.1 m/s | 5.4 |
| 1985 | 20.7°C | 14.5°C | 8.3°C | 27.1°C | 0.2°C | 133 mm | 79% | 0 m/s | 5.7 |
| 1984 | 17.5°C | 12.0°C | 6.5°C | 25.9°C | 0.1°C | 148 mm | 81% | 0 m/s | 4.2 |
| 1983 | 18.0°C | 11.8°C | 5.6°C | 23.7°C | -5.1°C | 132 mm | 80% | 0 m/s | — |
| 1982 | 23.2°C | 16.9°C | 10.6°C | 28.3°C | 2.6°C | 103 mm | 78% | 0.1 m/s | — |
| 1981 | 19.4°C | 13.0°C | 6.6°C | 26.0°C | -2.5°C | 75 mm | 75% | 0.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 20.6°C with lows near 8.5°C (mean 14.6°C), based on 45 years of NASA POWER data.
May averages 98 mm of rainfall in Butler, a relatively wet time of year. The wettest on record was 176 mm in 1989.
The hottest May reached 33.3°C in 2006. The coldest dipped to -5.2°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.5°C. Daytime highs moved from 19.8°C to 21.1°C and overnight lows from 7.5°C to 9.1°C over the same span.
May is one of the warmer months of the year in Butler and a relatively wet time of year, so plan for around 20.6°C daytime highs and 8.5°C at night.
Not quite — May is the 8th coolest month in Butler, averaging 14.6°C.
For May in Butler, pack light layers you can adjust through the day, with typical highs of 20.6°C and lows of 8.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 78% — quite humid.
Average wind speed in May is 0.1 m/s. The windiest May on record averaged 0.1 m/s (1981).
The wettest May on record was 1989 with 176 mm. On average, May sees 98 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 Butler 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.
