May is one of the warmer months of the year in Morrisville, with average highs near 21.8°C and lows around 10.2°C (mean 16°C). It is about average for rainfall, averaging 102 mm of rainfall and 79% relative humidity across the period.
May is one of the warmer months of the year in Morrisville. Across 45 years of records, the warmest May in Morrisville was 2004 — when the month averaged 19°C — while the coldest was 1997 at 13.4°C. Typical May days reach 21.8°C with nights near 10.2°C. The long-term trend is warming, about 0.4°C per decade.
May is about average for rainfall in Morrisville, averaging 102 mm of rainfall. The wettest May on record was 1984 with 196 mm, while the driest was 2023 at 13 mm.
Relative humidity in Morrisville during May averages 79%. The most humid May was 2003 at 84%, and the least humid was 2002 at 71%.
May receives about 5.4 kWh/m²/day of solar energy in Morrisville. The sunniest May was 2007 at 6.7 kWh/m²/day, and the cloudiest was 2003 at 3.9.
Average wind speed in Morrisville during May is 1.9 m/s. The windiest May was 1997 at 2.3 m/s, while the calmest were 1982 and 2023 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.5°C | 15.2°C | 15.9°C | 17.0°C | 16.2°C | +0.7°C |
| Avg High | 21.4°C | 21.2°C | 21.8°C | 22.5°C | 21.8°C | +0.4°C |
| Avg Low | 9.6°C | 9.2°C | 10.0°C | 11.6°C | 10.5°C | +0.9°C |
| Avg Rain | 122 mm | 98 mm | 87 mm | 108 mm | 96 mm | -26 mm |
May temperatures in Morrisville have risen by about 1.2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 0.2°C (2020) to a record high of 32.1°C (2022).
Rainfall in May is about average for rainfall, averaging 102 mm, with a wettest year of 196 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 Morrisville
May is a good time to visit Morrisville, with days averaging 21.8°C and nights around 10.2°C (mean 16°C, warmer than Morrisville's yearly average) and higher rainfall. June and August 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 | 22.1°C | 17.0°C | 11.9°C | 27.8°C | 6.4°C | 194 mm | 80% | 2 m/s | 4.7 |
| 2024 | 22.8°C | 17.6°C | 12.4°C | 28.7°C | 5.7°C | 76 mm | 83% | 1.7 m/s | 5.2 |
| 2023 | 21.6°C | 15.3°C | 8.9°C | 27.6°C | 3.5°C | 13 mm | 73% | 1.6 m/s | 6.5 |
| 2022 | 22.8°C | 17.1°C | 11.5°C | 32.1°C | 4.5°C | 129 mm | 79% | 2 m/s | 5.2 |
| 2021 | 21.7°C | 15.8°C | 9.9°C | 30.3°C | 3.5°C | 98 mm | 76% | 1.8 m/s | 5.7 |
| 2020 | 20.0°C | 14.3°C | 8.7°C | 27.6°C | 0.2°C | 65 mm | 77% | 2.2 m/s | 5.9 |
| 2019 | 22.2°C | 17.1°C | 12.0°C | 28.9°C | 4.1°C | 168 mm | 83% | 1.9 m/s | 5.1 |
| 2018 | 23.9°C | 18.5°C | 13.0°C | 29.3°C | 3.9°C | 149 mm | 83% | 1.8 m/s | 5 |
| 2017 | 20.8°C | 15.6°C | 10.3°C | 31.1°C | 3.8°C | 145 mm | 79% | 2.1 m/s | 5 |
| 2016 | 20.3°C | 15.3°C | 10.3°C | 29.4°C | 2.2°C | 134 mm | 82% | 1.7 m/s | 4.9 |
| 2015 | 24.2°C | 18.1°C | 12.1°C | 29.2°C | 6.0°C | 34 mm | 79% | 1.7 m/s | 6 |
| 2014 | 22.0°C | 16.3°C | 10.6°C | 27.3°C | 5.0°C | 90 mm | 81% | 1.7 m/s | 5.2 |
| 2013 | 21.5°C | 15.9°C | 10.3°C | 31.2°C | 1.3°C | 82 mm | 80% | 2 m/s | 5.7 |
| 2012 | 23.7°C | 18.5°C | 13.2°C | 31.1°C | 5.8°C | 109 mm | 81% | 1.7 m/s | 5 |
| 2011 | 23.2°C | 17.8°C | 12.4°C | 31.6°C | 4.8°C | 82 mm | 82% | 1.8 m/s | 5.2 |
| 2010 | 23.0°C | 17.3°C | 11.5°C | 30.9°C | 1.4°C | 83 mm | 79% | 1.9 m/s | 5.8 |
| 2009 | 21.9°C | 16.6°C | 11.2°C | 27.7°C | 3.4°C | 118 mm | 80% | 1.8 m/s | 4.9 |
| 2008 | 20.6°C | 14.6°C | 8.6°C | 27.5°C | 2.5°C | 118 mm | 79% | 2.1 m/s | 5.4 |
| 2007 | 22.9°C | 16.5°C | 10.2°C | 29.8°C | 3.1°C | 47 mm | 77% | 1.7 m/s | 6.7 |
| 2006 | 22.4°C | 16.3°C | 10.2°C | 31.1°C | 4.3°C | 66 mm | 74% | 1.8 m/s | 5.8 |
| 2005 | 19.4°C | 13.6°C | 7.9°C | 25.9°C | 2.1°C | 53 mm | 78% | 1.8 m/s | 5.7 |
| 2004 🔥 | 24.6°C | 19.0°C | 13.3°C | 29.5°C | 3.8°C | 90 mm | 82% | 1.8 m/s | 5.5 |
| 2003 | 19.2°C | 14.2°C | 9.2°C | 25.5°C | 3.7°C | 101 mm | 84% | 1.8 m/s | 3.9 |
| 2002 | 22.5°C | 15.8°C | 9.1°C | 30.3°C | 2.2°C | 103 mm | 71% | 2.1 m/s | 6 |
| 2001 | 22.5°C | 16.3°C | 10.1°C | 30.5°C | 2.8°C | 82 mm | 76% | 1.7 m/s | 5.6 |
| 2000 | 22.1°C | 16.3°C | 10.6°C | 31.3°C | 3.4°C | 94 mm | 79% | 1.9 m/s | 5.1 |
| 1999 | 22.7°C | 16.1°C | 9.5°C | 31.0°C | 3.2°C | 71 mm | 74% | 1.9 m/s | 5.7 |
| 1998 | 22.3°C | 16.9°C | 11.5°C | 29.8°C | 4.1°C | 163 mm | 83% | 1.9 m/s | 5.4 |
| 1997 ❄️ | 19.6°C | 13.4°C | 7.3°C | 28.0°C | 1.1°C | 86 mm | 76% | 2.3 m/s | 5.7 |
| 1996 | 20.0°C | 14.3°C | 8.6°C | 30.7°C | 2.2°C | 86 mm | 81% | 1.9 m/s | 5.3 |
| 1995 | 21.2°C | 15.1°C | 9.0°C | 27.6°C | 2.4°C | 87 mm | 76% | 1.9 m/s | 5 |
| 1994 | 20.1°C | 13.9°C | 7.6°C | 28.9°C | 2.7°C | 91 mm | 78% | 2.1 m/s | 6.1 |
| 1993 | 22.1°C | 16.1°C | 10.1°C | 27.9°C | 5.8°C | 51 mm | 79% | 1.7 m/s | 5.6 |
| 1992 | 20.2°C | 14.1°C | 7.9°C | 30.4°C | 1.8°C | 99 mm | 76% | 1.9 m/s | 5.3 |
| 1991 | 24.6°C | 18.3°C | 12.0°C | 30.5°C | 4.5°C | 59 mm | 80% | 1.7 m/s | 6.3 |
| 1990 | 19.7°C | 14.2°C | 8.7°C | 26.4°C | 4.3°C | 183 mm | 79% | 2.1 m/s | 4.9 |
| 1989 | 20.5°C | 15.1°C | 9.7°C | 28.2°C | 3.2°C | 196 mm | 83% | 2.1 m/s | 4.6 |
| 1988 | 21.4°C | 15.6°C | 9.9°C | 30.0°C | 2.8°C | 123 mm | 82% | 1.8 m/s | 4.9 |
| 1987 | 21.0°C | 15.2°C | 9.4°C | 31.1°C | 2.0°C | 74 mm | 82% | 1.8 m/s | 5.3 |
| 1986 | 22.6°C | 16.3°C | 10.0°C | 29.4°C | 0.4°C | 30 mm | 77% | 1.8 m/s | 6.2 |
| 1985 | 22.6°C | 16.4°C | 10.3°C | 28.1°C | 1.8°C | 136 mm | 75% | 2.1 m/s | 5.9 |
| 1984 🌧️ | 20.0°C | 14.5°C | 9.1°C | 27.2°C | 2.4°C | 196 mm | 82% | 2.2 m/s | 4.2 |
| 1983 | 20.2°C | 14.5°C | 8.8°C | 25.5°C | 0.5°C | 148 mm | 82% | 2.1 m/s | — |
| 1982 | 22.5°C | 16.4°C | 10.4°C | 27.8°C | 5.6°C | 86 mm | 79% | 1.6 m/s | — |
| 1981 | 22.0°C | 15.4°C | 8.9°C | 28.7°C | 1.6°C | 111 mm | 75% | 2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 21.8°C with lows near 10.2°C (mean 16°C), based on 45 years of NASA POWER data.
May averages 102 mm of rainfall in Morrisville, about average for rainfall. The wettest on record was 196 mm in 1984.
The hottest May reached 32.1°C in 2022. The coldest dipped to 0.2°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.2°C. Daytime highs moved from 21.5°C to 22.2°C and overnight lows from 9.5°C to 10.9°C over the same span.
May is one of the warmer months of the year in Morrisville and about average for rainfall, so plan for around 21.8°C daytime highs and 10.2°C at night.
Not quite — May is the 8th coolest month in Morrisville, averaging 16°C.
For May in Morrisville, pack light layers you can adjust through the day, with typical highs of 21.8°C and lows of 10.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 79% — quite humid.
Average wind speed in May is 1.9 m/s. The windiest May on record averaged 2.3 m/s (1997).
The wettest May on record was 1984 with 196 mm. On average, May sees 102 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 Morrisville 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.
