May is one of the warmer months of the year in Greensburg, with average highs near 20.6°C and lows around 8.9°C (mean 14.8°C). It is a relatively wet time of year, averaging 106 mm of rainfall and 78% relative humidity across the period.
May is one of the warmer months of the year in Greensburg. Across 45 years of records, the warmest May in Greensburg was 2018 — when the month averaged 18.7°C — while the coldest was 1997 at 10.9°C. Typical May days reach 20.6°C with nights near 8.9°C. The long-term trend is warming, about 0.5°C per decade.
May is a relatively wet time of year in Greensburg, averaging 106 mm of rainfall. The wettest May on record was 2025 with 184 mm, while the driest was 2007 at 50 mm.
Relative humidity in Greensburg during May averages 78%. The most humid May was 2011 at 84%, and the least humid was 2023 at 71%.
May receives about 5.3 kWh/m²/day of solar energy in Greensburg. 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 Greensburg 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 | 14.1°C | 14.0°C | 14.5°C | 16.3°C | 14.8°C | +0.7°C |
| Avg High | 20.0°C | 20.0°C | 20.5°C | 21.9°C | 20.6°C | +0.6°C |
| Avg Low | 8.2°C | 8.1°C | 8.6°C | 10.7°C | 9.1°C | +0.9°C |
| Avg Rain | 119 mm | 95 mm | 102 mm | 106 mm | 110 mm | -9 mm |
May temperatures in Greensburg have risen by about 1.4°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.1°C (2020) to a record high of 33.8°C (2006).
Rainfall in May is a relatively wet time of year, averaging 106 mm, with a wettest year of 184 mm.
A good time to visit Greensburg
May is a good time to visit Greensburg, with days averaging 20.6°C and nights around 8.9°C (mean 14.8°C, warmer than Greensburg'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 🌧️ | 20.1°C | 14.8°C | 9.5°C | 26.9°C | 0.7°C | 184 mm | 81% | 0 m/s | 4.7 |
| 2024 | 22.7°C | 17.4°C | 12.0°C | 29.4°C | 6.3°C | 120 mm | 80% | 0.1 m/s | 5.5 |
| 2023 | 20.5°C | 13.9°C | 7.4°C | 28.6°C | 1.7°C | 53 mm | 71% | 0.1 m/s | 6.1 |
| 2022 | 21.8°C | 16.0°C | 10.2°C | 29.0°C | 1.2°C | 146 mm | 80% | 0.1 m/s | 5.4 |
| 2021 | 20.2°C | 14.1°C | 8.0°C | 29.0°C | -1.4°C | 100 mm | 74% | 0.1 m/s | 5.3 |
| 2020 | 18.3°C | 12.8°C | 7.3°C | 28.6°C | -5.1°C | 57 mm | 78% | 0 m/s | 5.3 |
| 2019 | 22.1°C | 16.8°C | 11.5°C | 27.9°C | 2.9°C | 147 mm | 83% | 0 m/s | 5 |
| 2018 🔥 | 24.1°C | 18.7°C | 13.2°C | 30.3°C | 2.4°C | 102 mm | 84% | 0.1 m/s | 5.3 |
| 2017 | 19.7°C | 14.4°C | 9.1°C | 27.3°C | -2.1°C | 140 mm | 79% | 0.1 m/s | 5 |
| 2016 | 20.2°C | 14.7°C | 9.2°C | 29.5°C | 0.4°C | 80 mm | 79% | 0.1 m/s | 5.1 |
| 2015 | 23.5°C | 17.5°C | 11.5°C | 28.8°C | 1.9°C | 55 mm | 77% | 0.1 m/s | 5.9 |
| 2014 | 20.8°C | 15.1°C | 9.4°C | 26.6°C | 1.0°C | 99 mm | 79% | 0.1 m/s | 5.2 |
| 2013 | 21.1°C | 15.1°C | 9.1°C | 28.6°C | -1.0°C | 61 mm | 77% | 0 m/s | 5.8 |
| 2012 | 23.9°C | 18.1°C | 12.3°C | 30.7°C | 1.7°C | 120 mm | 79% | 0.1 m/s | 5.8 |
| 2011 | 21.4°C | 16.3°C | 11.2°C | 29.6°C | 0.6°C | 118 mm | 84% | 0 m/s | 4.8 |
| 2010 | 22.1°C | 16.1°C | 10.2°C | 29.5°C | -1.3°C | 132 mm | 79% | 0.1 m/s | 5.4 |
| 2009 | 20.4°C | 14.7°C | 9.1°C | 26.4°C | -1.1°C | 109 mm | 77% | 0.1 m/s | 5.4 |
| 2008 | 18.4°C | 12.6°C | 6.8°C | 25.8°C | 1.1°C | 130 mm | 78% | 0.1 m/s | 4.9 |
| 2007 | 23.0°C | 16.0°C | 9.0°C | 30.4°C | 2.0°C | 50 mm | 73% | 0.1 m/s | 6.6 |
| 2006 | 19.9°C | 13.9°C | 7.8°C | 33.8°C | -0.4°C | 92 mm | 77% | 0.1 m/s | 5.3 |
| 2005 | 18.3°C | 12.5°C | 6.7°C | 25.8°C | -0.7°C | 66 mm | 76% | 0.1 m/s | 5.5 |
| 2004 | 23.3°C | 17.5°C | 11.7°C | 27.9°C | -1.5°C | 127 mm | 82% | 0 m/s | 5.2 |
| 2003 | 18.9°C | 13.9°C | 8.9°C | 24.6°C | 2.8°C | 147 mm | 83% | 0 m/s | 4.3 |
| 2002 | 19.7°C | 13.3°C | 6.9°C | 27.0°C | -2.0°C | 130 mm | 77% | 0.1 m/s | 5.2 |
| 2001 | 21.3°C | 15.0°C | 8.7°C | 28.3°C | 1.3°C | 74 mm | 72% | 0.1 m/s | 5.3 |
| 2000 | 22.0°C | 16.0°C | 10.0°C | 27.6°C | 2.8°C | 99 mm | 77% | 0.1 m/s | 5.2 |
| 1999 | 22.0°C | 15.3°C | 8.6°C | 28.7°C | 4.2°C | 72 mm | 73% | 0.1 m/s | 6.3 |
| 1998 | 22.3°C | 16.7°C | 11.1°C | 29.6°C | 4.2°C | 95 mm | 80% | 0.1 m/s | 5.7 |
| 1997 ❄️ | 16.9°C | 10.9°C | 5.0°C | 25.3°C | 0.1°C | 142 mm | 75% | 0.1 m/s | 5.5 |
| 1996 | 19.1°C | 13.6°C | 8.1°C | 27.6°C | -2.3°C | 116 mm | 81% | 0.1 m/s | 4.7 |
| 1995 | 19.5°C | 13.8°C | 8.1°C | 25.0°C | -0.2°C | 139 mm | 79% | 0.1 m/s | 5 |
| 1994 | 17.9°C | 11.6°C | 5.4°C | 26.1°C | -0.1°C | 73 mm | 77% | 0.1 m/s | 5.3 |
| 1993 | 20.7°C | 14.6°C | 8.4°C | 28.7°C | 1.8°C | 56 mm | 76% | 0.1 m/s | 5.4 |
| 1992 | 19.6°C | 13.3°C | 7.0°C | 26.6°C | 0.9°C | 61 mm | 76% | 0.1 m/s | 5.6 |
| 1991 | 23.7°C | 18.0°C | 12.3°C | 29.0°C | 4.0°C | 57 mm | 79% | 0.1 m/s | 5.8 |
| 1990 | 18.0°C | 12.5°C | 7.1°C | 23.6°C | 2.3°C | 144 mm | 79% | 0 m/s | 4.6 |
| 1989 | 17.6°C | 12.7°C | 7.7°C | 26.3°C | 0.9°C | 173 mm | 84% | 0 m/s | 4.2 |
| 1988 | 20.9°C | 14.8°C | 8.7°C | 27.9°C | 0.8°C | 110 mm | 76% | 0.1 m/s | 5.6 |
| 1987 | 22.0°C | 15.7°C | 9.3°C | 28.8°C | -0.7°C | 102 mm | 79% | 0.1 m/s | 5.8 |
| 1986 | 20.8°C | 14.8°C | 8.9°C | 26.6°C | -3.2°C | 69 mm | 78% | 0.1 m/s | 5.4 |
| 1985 | 20.8°C | 14.7°C | 8.7°C | 26.8°C | 0.2°C | 149 mm | 79% | 0 m/s | 5.7 |
| 1984 | 17.5°C | 12.3°C | 7.0°C | 25.9°C | 0.0°C | 140 mm | 81% | 0 m/s | 4.2 |
| 1983 | 18.3°C | 12.2°C | 6.2°C | 23.7°C | -4.4°C | 143 mm | 79% | 0.1 m/s | — |
| 1982 | 22.9°C | 16.9°C | 10.8°C | 28.7°C | 2.9°C | 110 mm | 78% | 0.1 m/s | — |
| 1981 | 19.6°C | 13.1°C | 6.7°C | 25.6°C | -2.2°C | 76 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 8.9°C (mean 14.8°C), based on 45 years of NASA POWER data.
May averages 106 mm of rainfall in Greensburg, a relatively wet time of year. The wettest on record was 184 mm in 2025.
The hottest May reached 33.8°C in 2006. The coldest dipped to -5.1°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 19.8°C to 21.1°C and overnight lows from 7.9°C to 9.4°C over the same span.
May is one of the warmer months of the year in Greensburg and a relatively wet time of year, so plan for around 20.6°C daytime highs and 8.9°C at night.
Not quite — May is the 8th coolest month in Greensburg, averaging 14.8°C.
For May in Greensburg, pack light layers you can adjust through the day, with typical highs of 20.6°C and lows of 8.9°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 2025 with 184 mm. On average, May sees 106 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 Greensburg 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.
