May is one of the warmer months of the year in Newton Mearns, with average highs near 12.9°C and lows around 5.6°C (mean 9.3°C). It is one of the drier months, averaging 86 mm of rainfall and 84% relative humidity across the period.
May is one of the warmer months of the year in Newton Mearns. Across 45 years of records, the warmest May in Newton Mearns was 2024 — when the month averaged 12.6°C — while the coldest was 1996 at 6.7°C. Typical May days reach 12.9°C with nights near 5.6°C. The long-term trend is warming, about 0.3°C per decade.
May is one of the drier months in Newton Mearns, averaging 86 mm of rainfall. The wettest May on record was 1986 with 188 mm, while the driest was 1984 at 25 mm.
Relative humidity in Newton Mearns during May averages 84%. The most humid May was 2003 at 88%, and the least humid was 1984 at 78%.
May receives about 4.8 kWh/m²/day of solar energy in Newton Mearns. The sunniest May was 2025 at 5.9 kWh/m²/day, and the cloudiest were 1986 and 2003 at 4.
Average wind speed in Newton Mearns during May is 3.4 m/s. The windiest May was 2011 at 5 m/s, while the calmest were 1984 and 1990 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.8°C | 9.0°C | 9.4°C | 9.1°C | 10.3°C | +1.5°C |
| Avg High | 12.5°C | 12.7°C | 13.0°C | 12.8°C | 14.1°C | +1.6°C |
| Avg Low | 5.0°C | 5.3°C | 5.9°C | 5.5°C | 6.5°C | +1.5°C |
| Avg Rain | 90 mm | 72 mm | 93 mm | 91 mm | 81 mm | -9 mm |
May temperatures in Newton Mearns have risen by about 1.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -1.9°C (1981) to a record high of 23.1°C (2012).
Rainfall in May is one of the drier months, averaging 86 mm, with a wettest year of 188 mm.
A good time to visit Newton Mearns
May is a good time to visit Newton Mearns, with days averaging 12.9°C and nights around 5.6°C (mean 9.3°C, warmer than Newton Mearns's yearly average) and higher rainfall. July 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 | 15.6°C | 10.8°C | 6.0°C | 20.0°C | 0.9°C | 58 mm | 80% | 3.1 m/s | 5.9 |
| 2024 🔥 | 16.2°C | 12.6°C | 9.1°C | 21.6°C | 6.2°C | 104 mm | 87% | 2.7 m/s | 4.3 |
| 2023 | 14.6°C | 10.7°C | 6.7°C | 20.3°C | 3.8°C | 43 mm | 85% | 2.6 m/s | 5 |
| 2022 | 13.3°C | 10.3°C | 7.2°C | 17.4°C | 4.2°C | 112 mm | 86% | 4 m/s | 4.2 |
| 2021 | 11.2°C | 7.8°C | 4.4°C | 19.2°C | -1.6°C | 106 mm | 85% | 2.9 m/s | 4.6 |
| 2020 | 13.6°C | 9.5°C | 5.5°C | 21.0°C | -1.6°C | 61 mm | 82% | 3.3 m/s | 5.3 |
| 2019 | 12.5°C | 8.8°C | 5.1°C | 19.7°C | -0.5°C | 94 mm | 81% | 2.8 m/s | 4.9 |
| 2018 | 14.8°C | 10.7°C | 6.6°C | 21.3°C | 1.4°C | 51 mm | 85% | 3.2 m/s | 5 |
| 2017 | 14.9°C | 10.7°C | 6.6°C | 22.4°C | 1.4°C | 73 mm | 83% | 3.3 m/s | 5.2 |
| 2016 | 13.5°C | 9.7°C | 5.9°C | 18.7°C | 0.8°C | 77 mm | 85% | 3.5 m/s | 5.1 |
| 2015 | 10.3°C | 7.2°C | 4.2°C | 13.3°C | -1.8°C | 131 mm | 85% | 4.4 m/s | 4.5 |
| 2014 | 12.9°C | 9.7°C | 6.6°C | 18.4°C | 0.9°C | 104 mm | 87% | 3.1 m/s | 4.1 |
| 2013 | 11.7°C | 8.2°C | 4.7°C | 18.5°C | 1.4°C | 103 mm | 86% | 4 m/s | 4.4 |
| 2012 | 12.8°C | 8.8°C | 4.8°C | 23.1°C | -1.7°C | 74 mm | 84% | 3 m/s | 5.2 |
| 2011 | 11.8°C | 9.0°C | 6.1°C | 16.9°C | 1.0°C | 163 mm | 86% | 5 m/s | 4.3 |
| 2010 | 12.3°C | 8.4°C | 4.5°C | 20.2°C | -0.5°C | 43 mm | 83% | 2.6 m/s | 5.2 |
| 2009 | 12.4°C | 9.1°C | 5.8°C | 20.7°C | 1.7°C | 113 mm | 86% | 4.3 m/s | 4.6 |
| 2008 | 15.0°C | 11.0°C | 6.9°C | 20.0°C | 1.9°C | 42 mm | 83% | 3.2 m/s | 5.1 |
| 2007 | 12.0°C | 8.7°C | 5.5°C | 17.6°C | 1.2°C | 97 mm | 85% | 3.6 m/s | 5.1 |
| 2006 | 12.7°C | 9.0°C | 5.2°C | 19.5°C | 1.1°C | 122 mm | 84% | 3.8 m/s | 4.7 |
| 2005 | 11.8°C | 8.3°C | 4.8°C | 15.3°C | -1.0°C | 117 mm | 84% | 3.4 m/s | 5 |
| 2004 | 13.7°C | 10.1°C | 6.5°C | 18.6°C | 3.5°C | 61 mm | 84% | 2.7 m/s | 4.9 |
| 2003 | 11.8°C | 9.0°C | 6.3°C | 19.9°C | 3.2°C | 153 mm | 88% | 3.8 m/s | 4 |
| 2002 | 12.7°C | 9.4°C | 6.0°C | 17.8°C | 1.6°C | 131 mm | 86% | 3.7 m/s | 4.1 |
| 2001 | 14.7°C | 10.4°C | 6.0°C | 21.5°C | 1.3°C | 41 mm | 83% | 2.9 m/s | 5 |
| 2000 | 13.4°C | 9.4°C | 5.5°C | 20.0°C | 3.1°C | 58 mm | 84% | 3.1 m/s | 5.4 |
| 1999 | 13.0°C | 9.9°C | 6.8°C | 17.5°C | 3.3°C | 119 mm | 86% | 3.6 m/s | 4.5 |
| 1998 | 13.7°C | 9.8°C | 6.0°C | 20.1°C | 1.5°C | 52 mm | 86% | 3.4 m/s | 5 |
| 1997 | 12.6°C | 8.9°C | 5.2°C | 19.9°C | -1.8°C | 89 mm | 84% | 3.2 m/s | 4.9 |
| 1996 ❄️ | 10.3°C | 6.7°C | 3.1°C | 15.0°C | -1.6°C | 82 mm | 84% | 3.4 m/s | 4.5 |
| 1995 | 12.0°C | 8.4°C | 4.8°C | 17.5°C | -1.5°C | 81 mm | 84% | 3.3 m/s | 4.8 |
| 1994 | 12.0°C | 8.0°C | 4.0°C | 16.6°C | -0.4°C | 31 mm | 81% | 3.9 m/s | 5 |
| 1993 | 12.1°C | 8.4°C | 4.8°C | 16.2°C | 1.0°C | 120 mm | 86% | 3.7 m/s | 4.2 |
| 1992 | 13.9°C | 10.1°C | 6.3°C | 20.8°C | 0.9°C | 65 mm | 85% | 4.3 m/s | 5.3 |
| 1991 | 13.0°C | 9.1°C | 5.2°C | 17.4°C | 0.7°C | 30 mm | 84% | 3.1 m/s | 4.7 |
| 1990 | 14.4°C | 10.4°C | 6.5°C | 21.6°C | 2.6°C | 53 mm | 81% | 2.3 m/s | 5.1 |
| 1989 | 13.5°C | 9.3°C | 5.1°C | 20.8°C | 1.3°C | 47 mm | 83% | 3.4 m/s | 5.1 |
| 1988 | 13.4°C | 9.4°C | 5.5°C | 19.4°C | 1.4°C | 67 mm | 84% | 3.3 m/s | 4.8 |
| 1987 | 11.9°C | 8.1°C | 4.3°C | 16.5°C | 1.0°C | 72 mm | 83% | 3.4 m/s | 4.9 |
| 1986 🌧️ | 11.0°C | 8.2°C | 5.4°C | 15.4°C | 2.8°C | 188 mm | 88% | 4.8 m/s | 4 |
| 1985 | 12.4°C | 8.6°C | 4.7°C | 17.6°C | -0.4°C | 93 mm | 83% | 3.3 m/s | 4.3 |
| 1984 | 13.5°C | 9.2°C | 4.8°C | 19.7°C | -0.9°C | 25 mm | 78% | 2.3 m/s | 5.4 |
| 1983 | 11.2°C | 8.0°C | 4.8°C | 14.4°C | 2.1°C | 116 mm | 85% | 3.1 m/s | — |
| 1982 | 12.6°C | 8.7°C | 4.9°C | 19.3°C | -1.8°C | 83 mm | 83% | 3.4 m/s | — |
| 1981 | 13.0°C | 9.4°C | 5.8°C | 19.1°C | -1.9°C | 118 mm | 85% | 3.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 12.9°C with lows near 5.6°C (mean 9.3°C), based on 45 years of NASA POWER data.
May averages 86 mm of rainfall in Newton Mearns, one of the drier months. The wettest on record was 188 mm in 1986.
The hottest May reached 23.1°C in 2012. The coldest dipped to -1.9°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.6°C. Daytime highs moved from 12.5°C to 14.2°C and overnight lows from 5°C to 6.7°C over the same span.
May is one of the warmer months of the year in Newton Mearns and one of the drier months, so plan for around 12.9°C daytime highs and 5.6°C at night.
Not quite — May is the 8th coolest month in Newton Mearns, averaging 9.3°C.
For May in Newton Mearns, pack warm layers and a jacket for chilly mornings, with typical highs of 12.9°C and lows of 5.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 84% — quite humid.
Average wind speed in May is 3.4 m/s. The windiest May on record averaged 5 m/s (2011).
The wettest May on record was 1986 with 188 mm. On average, May sees 86 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 Newton Mearns 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.
