May is one of the warmer months of the year in Maryville, with average highs near 22.4°C and lows around 11.4°C (mean 16.9°C). It is about average for rainfall, averaging 121 mm of rainfall and 79% relative humidity across the period.
May is one of the warmer months of the year in Maryville. Across 45 years of records, the warmest May in Maryville was 2018 — when the month averaged 19.8°C — while the coldest was 1989 at 13.9°C. Typical May days reach 22.4°C with nights near 11.4°C. The long-term trend is warming, about 0.4°C per decade.
May is about average for rainfall in Maryville, averaging 121 mm of rainfall. The wettest May on record was 2003 with 245 mm, while the driest was 2007 at 37 mm.
Relative humidity in Maryville during May averages 79%. The most humid Mays were 2003 and 2009 at 84%, and the least humid was 2007 at 65%.
May receives about 5.7 kWh/m²/day of solar energy in Maryville. The sunniest May was 2007 at 6.6 kWh/m²/day, and the cloudiest was 2025 at 4.8.
Average wind speed in Maryville during May is 0.4 m/s. The windiest May was 1988 at 0.5 m/s, while the calmest were 2022, 2023 and 2024, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.2°C | 16.6°C | 17.0°C | 17.9°C | 17.0°C | +0.8°C |
| Avg High | 21.9°C | 22.0°C | 22.6°C | 23.2°C | 22.2°C | +0.3°C |
| Avg Low | 10.5°C | 11.1°C | 11.4°C | 12.5°C | 11.7°C | +1.2°C |
| Avg Rain | 130 mm | 114 mm | 119 mm | 108 mm | 143 mm | +13 mm |
May temperatures in Maryville have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -0.8°C (2011) to a record high of 32°C (1988).
Rainfall in May is about average for rainfall, averaging 121 mm, with a wettest year of 245 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
A good time to visit Maryville
May is a good time to visit Maryville, with days averaging 22.4°C and nights around 11.4°C (mean 16.9°C, warmer than Maryville's yearly average) and higher rainfall. August 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 | 21.6°C | 17.0°C | 12.4°C | 25.8°C | 6.5°C | 210 mm | 83% | 0.4 m/s | 4.8 |
| 2024 | 23.3°C | 18.4°C | 13.4°C | 26.9°C | 8.2°C | 202 mm | 83% | 0.3 m/s | 5.4 |
| 2023 | 21.9°C | 16.4°C | 11.0°C | 26.4°C | 3.6°C | 70 mm | 80% | 0.3 m/s | 5.6 |
| 2022 | 24.2°C | 18.5°C | 12.7°C | 28.8°C | 7.9°C | 141 mm | 79% | 0.3 m/s | 5.9 |
| 2021 | 21.4°C | 16.0°C | 10.5°C | 27.5°C | 2.8°C | 110 mm | 78% | 0.4 m/s | 5.7 |
| 2020 | 20.8°C | 15.5°C | 10.1°C | 26.6°C | 0.6°C | 124 mm | 81% | 0.3 m/s | 5.7 |
| 2019 | 24.6°C | 19.4°C | 14.2°C | 28.9°C | 5.5°C | 114 mm | 80% | 0.4 m/s | 6.4 |
| 2018 🔥 | 24.6°C | 19.8°C | 15.0°C | 28.3°C | 5.5°C | 168 mm | 82% | 0.3 m/s | 5.6 |
| 2017 | 22.4°C | 17.1°C | 11.7°C | 27.6°C | 4.3°C | 154 mm | 80% | 0.4 m/s | 5.7 |
| 2016 | 21.8°C | 16.5°C | 11.2°C | 27.4°C | 1.6°C | 78 mm | 79% | 0.3 m/s | 5.9 |
| 2015 | 24.1°C | 18.4°C | 12.6°C | 27.2°C | 5.2°C | 64 mm | 78% | 0.3 m/s | 6.3 |
| 2014 | 23.0°C | 17.4°C | 11.8°C | 27.3°C | 3.6°C | 90 mm | 79% | 0.3 m/s | 6.1 |
| 2013 | 21.1°C | 15.8°C | 10.5°C | 26.8°C | 1.8°C | 118 mm | 81% | 0.3 m/s | 5.8 |
| 2012 | 23.9°C | 18.9°C | 13.8°C | 29.1°C | 4.6°C | 108 mm | 80% | 0.3 m/s | 5.9 |
| 2011 | 22.5°C | 17.0°C | 11.4°C | 30.8°C | -0.8°C | 59 mm | 79% | 0.4 m/s | 5.8 |
| 2010 | 24.0°C | 18.6°C | 13.2°C | 28.4°C | 3.5°C | 125 mm | 80% | 0.3 m/s | 5.7 |
| 2009 | 21.9°C | 17.0°C | 12.1°C | 25.1°C | 1.8°C | 211 mm | 84% | 0.3 m/s | 5.2 |
| 2008 | 21.7°C | 16.0°C | 10.4°C | 26.8°C | 5.2°C | 84 mm | 77% | 0.4 m/s | 5.9 |
| 2007 | 24.9°C | 18.1°C | 11.2°C | 30.0°C | 2.6°C | 37 mm | 65% | 0.4 m/s | 6.6 |
| 2006 | 21.8°C | 16.4°C | 11.0°C | 29.9°C | 4.6°C | 100 mm | 78% | 0.4 m/s | 5.6 |
| 2005 | 21.0°C | 15.3°C | 9.6°C | 26.7°C | 0.3°C | 74 mm | 77% | 0.4 m/s | 6 |
| 2004 | 24.3°C | 18.8°C | 13.3°C | 28.1°C | 1.8°C | 107 mm | 79% | 0.4 m/s | 5.5 |
| 2003 🌧️ | 21.9°C | 17.2°C | 12.5°C | 26.1°C | 6.6°C | 245 mm | 84% | 0.4 m/s | 5 |
| 2002 | 22.3°C | 16.2°C | 10.1°C | 26.4°C | 0.8°C | 127 mm | 78% | 0.4 m/s | 5.8 |
| 2001 | 22.7°C | 16.9°C | 11.1°C | 27.3°C | 6.2°C | 101 mm | 76% | 0.4 m/s | 5.6 |
| 2000 | 23.7°C | 17.9°C | 12.2°C | 27.0°C | 6.0°C | 104 mm | 78% | 0.4 m/s | 5.7 |
| 1999 | 22.2°C | 16.3°C | 10.3°C | 25.2°C | 1.8°C | 121 mm | 77% | 0.4 m/s | 6.5 |
| 1998 | 23.9°C | 18.8°C | 13.7°C | 28.9°C | 6.0°C | 92 mm | 81% | 0.4 m/s | 5.8 |
| 1997 | 19.9°C | 14.0°C | 8.2°C | 26.1°C | 2.4°C | 138 mm | 78% | 0.4 m/s | 6.1 |
| 1996 | 23.3°C | 17.9°C | 12.5°C | 29.3°C | 0.9°C | 146 mm | 82% | 0.4 m/s | 6 |
| 1995 | 22.5°C | 17.0°C | 11.4°C | 27.1°C | 4.0°C | 112 mm | 79% | 0.4 m/s | 5.4 |
| 1994 | 20.5°C | 14.6°C | 8.7°C | 26.1°C | 3.2°C | 74 mm | 78% | 0.4 m/s | 6.3 |
| 1993 | 21.8°C | 16.6°C | 11.3°C | 26.3°C | 4.5°C | 95 mm | 80% | 0.4 m/s | 5.3 |
| 1992 | 20.3°C | 15.2°C | 10.1°C | 25.9°C | 2.3°C | 90 mm | 80% | 0.3 m/s | 5.3 |
| 1991 | 24.3°C | 19.2°C | 14.2°C | 28.4°C | 4.4°C | 121 mm | 83% | 0.3 m/s | 5.1 |
| 1990 | 21.2°C | 15.9°C | 10.7°C | 25.5°C | 3.3°C | 154 mm | 80% | 0.4 m/s | 5.4 |
| 1989 ❄️ | 19.5°C | 13.9°C | 8.4°C | 27.1°C | -0.3°C | 158 mm | 81% | 0.4 m/s | 5 |
| 1988 | 21.9°C | 15.8°C | 9.7°C | 32.0°C | 2.5°C | 62 mm | 70% | 0.5 m/s | 6 |
| 1987 | 24.0°C | 18.7°C | 13.4°C | 28.4°C | 6.2°C | 121 mm | 82% | 0.3 m/s | 5.8 |
| 1986 | 23.5°C | 17.3°C | 11.2°C | 27.5°C | 0.0°C | 101 mm | 73% | 0.3 m/s | 5.3 |
| 1985 | 22.5°C | 16.6°C | 10.7°C | 28.4°C | 3.9°C | 75 mm | 76% | 0.4 m/s | 5.3 |
| 1984 | 20.5°C | 14.9°C | 9.2°C | 26.2°C | 1.7°C | 232 mm | 80% | 0.4 m/s | 5.4 |
| 1983 | 21.0°C | 15.3°C | 9.6°C | 25.0°C | 2.8°C | 169 mm | 79% | 0.4 m/s | — |
| 1982 | 23.5°C | 18.1°C | 12.8°C | 26.8°C | 5.2°C | 115 mm | 79% | 0.4 m/s | — |
| 1981 | 21.1°C | 15.2°C | 9.2°C | 26.3°C | 3.1°C | 138 mm | 74% | 0.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 22.4°C with lows near 11.4°C (mean 16.9°C), based on 45 years of NASA POWER data.
May averages 121 mm of rainfall in Maryville, about average for rainfall. The wettest on record was 245 mm in 2003.
The hottest May reached 32°C in 1988. The coldest dipped to -0.8°C in 2011.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.3°C. Daytime highs moved from 21.7°C to 22.5°C and overnight lows from 10.3°C to 12°C over the same span.
May is one of the warmer months of the year in Maryville and about average for rainfall, so plan for around 22.4°C daytime highs and 11.4°C at night.
Not quite — May is the 8th coolest month in Maryville, averaging 16.9°C.
For May in Maryville, pack light layers you can adjust through the day, with typical highs of 22.4°C and lows of 11.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 79% — quite humid.
Average wind speed in May is 0.4 m/s. The windiest May on record averaged 0.5 m/s (1988).
The wettest May on record was 2003 with 245 mm. On average, May sees 121 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 Maryville 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.
