May is one of the cooler months of the year in Glencoe, with average highs near 11°C and lows around 3.8°C (mean 7.4°C). It is a relatively wet time of year, averaging 111 mm of rainfall and 89% relative humidity across the period.
May is one of the cooler months of the year in Glencoe. Across 45 years of records, the warmest Mays in Glencoe were 1999, 2019 and 2023 — when the month averaged 9.6°C — while the coldest was 1992 at 4.7°C. Typical May days reach 11°C with nights near 3.8°C. The long-term trend is warming, about 0.3°C per decade.
May is a relatively wet time of year in Glencoe, averaging 111 mm of rainfall. The wettest May on record was 2009 with 174 mm, while the driest was 2020 at 37 mm.
Relative humidity in Glencoe during May averages 89%. The most humid May was 2001 at 92%, and the least humid was 1999 at 86%.
May receives about 1.4 kWh/m²/day of solar energy in Glencoe. The sunniest Mays were 2020, 2021 and 2025, among others at 1.5 kWh/m²/day, and the cloudiest were 1998, 2001 and 2011 at 1.2.
Average wind speed in Glencoe during May is 2.9 m/s. The windiest May was 1990 at 4 m/s, while the calmest were 1981 and 2008 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.8°C | 7.4°C | 7.2°C | 7.7°C | 8.3°C | +1.5°C |
| Avg High | 10.4°C | 10.8°C | 10.7°C | 11.5°C | 12.1°C | +1.7°C |
| Avg Low | 3.2°C | 3.9°C | 3.8°C | 4.0°C | 4.4°C | +1.2°C |
| Avg Rain | 112 mm | 107 mm | 121 mm | 114 mm | 94 mm | -18 mm |
May temperatures in Glencoe have risen by about 1.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -4.1°C (1988) to a record high of 21.2°C (2023).
Rainfall in May is a relatively wet time of year, averaging 111 mm, with a wettest year of 174 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A quieter season to visit Glencoe
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Glencoe. That said, May — with days averaging 11°C and nights around 3.8°C (mean 7.4°C) and higher rainfall (111 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 12.7°C | 9.0°C | 5.3°C | 18.9°C | 1.1°C | 77 mm | 87% | 3.2 m/s | 1.5 |
| 2024 | 8.9°C | 5.8°C | 2.6°C | 15.5°C | -2.5°C | 91 mm | 91% | 2.9 m/s | 1.4 |
| 2023 | 13.3°C | 9.6°C | 5.9°C | 21.2°C | 1.2°C | 156 mm | 89% | 2.4 m/s | 1.4 |
| 2022 | 13.1°C | 9.2°C | 5.4°C | 20.0°C | -1.3°C | 92 mm | 87% | 2.6 m/s | 1.4 |
| 2021 | 11.8°C | 7.5°C | 3.3°C | 17.1°C | -3.4°C | 111 mm | 88% | 2.6 m/s | 1.5 |
| 2020 | 12.6°C | 8.4°C | 4.1°C | 19.2°C | -1.0°C | 37 mm | 89% | 2.1 m/s | 1.5 |
| 2019 | 13.4°C | 9.6°C | 5.9°C | 18.7°C | 1.2°C | 134 mm | 88% | 3 m/s | 1.3 |
| 2018 | 10.5°C | 6.8°C | 3.0°C | 19.0°C | -1.9°C | 91 mm | 88% | 2.8 m/s | 1.4 |
| 2017 | 11.4°C | 7.3°C | 3.3°C | 17.8°C | -1.3°C | 81 mm | 90% | 2.3 m/s | 1.5 |
| 2016 | 12.2°C | 8.6°C | 5.0°C | 20.1°C | -0.3°C | 149 mm | 88% | 3 m/s | 1.3 |
| 2015 | 11.0°C | 7.3°C | 3.6°C | 18.3°C | -1.1°C | 81 mm | 88% | 3.3 m/s | 1.3 |
| 2014 | 11.8°C | 7.8°C | 3.8°C | 17.9°C | -1.1°C | 165 mm | 88% | 2.9 m/s | 1.4 |
| 2013 | 11.3°C | 7.6°C | 3.9°C | 18.8°C | -0.5°C | 119 mm | 90% | 2.7 m/s | 1.3 |
| 2012 | 11.2°C | 7.2°C | 3.2°C | 16.9°C | -1.1°C | 101 mm | 88% | 2.6 m/s | 1.4 |
| 2011 | 11.5°C | 8.2°C | 4.9°C | 15.8°C | 1.5°C | 121 mm | 89% | 3.1 m/s | 1.2 |
| 2010 | 10.8°C | 7.1°C | 3.4°C | 16.2°C | -1.1°C | 99 mm | 91% | 2.2 m/s | 1.4 |
| 2009 🌧️ | 8.7°C | 5.4°C | 2.1°C | 13.2°C | -1.7°C | 174 mm | 90% | 2.6 m/s | 1.4 |
| 2008 | 9.8°C | 6.0°C | 2.2°C | 15.3°C | -3.0°C | 106 mm | 91% | 2 m/s | 1.4 |
| 2007 | 12.7°C | 9.0°C | 5.4°C | 17.8°C | 1.7°C | 100 mm | 87% | 3.8 m/s | 1.5 |
| 2006 | 10.6°C | 7.1°C | 3.7°C | 14.7°C | -1.0°C | 95 mm | 91% | 2.2 m/s | 1.5 |
| 2005 | 10.9°C | 7.1°C | 3.3°C | 16.5°C | -2.8°C | 117 mm | 88% | 2.7 m/s | 1.5 |
| 2004 | 11.1°C | 7.5°C | 3.9°C | 16.7°C | 0.3°C | 118 mm | 89% | 2.7 m/s | 1.4 |
| 2003 | 10.3°C | 7.3°C | 4.3°C | 17.6°C | -1.6°C | 142 mm | 90% | 3.5 m/s | 1.3 |
| 2002 | 10.4°C | 7.5°C | 4.6°C | 17.0°C | -1.0°C | 107 mm | 90% | 3.9 m/s | 1.3 |
| 2001 | 10.5°C | 7.1°C | 3.7°C | 18.4°C | -3.0°C | 120 mm | 92% | 2.6 m/s | 1.2 |
| 2000 | 12.3°C | 8.4°C | 4.4°C | 16.9°C | -2.0°C | 131 mm | 88% | 2.8 m/s | 1.3 |
| 1999 🔥 | 13.4°C | 9.6°C | 5.8°C | 18.9°C | 2.0°C | 89 mm | 86% | 3.4 m/s | 1.4 |
| 1998 | 10.7°C | 7.5°C | 4.2°C | 15.3°C | -2.7°C | 69 mm | 90% | 3 m/s | 1.2 |
| 1997 | 11.8°C | 8.1°C | 4.3°C | 19.1°C | 1.0°C | 94 mm | 89% | 2.5 m/s | 1.4 |
| 1996 | 10.7°C | 7.2°C | 3.7°C | 17.5°C | -0.8°C | 123 mm | 89% | 3.6 m/s | 1.3 |
| 1995 | 11.3°C | 7.8°C | 4.2°C | 16.9°C | 0.5°C | 148 mm | 89% | 2.7 m/s | 1.5 |
| 1994 | 9.8°C | 6.6°C | 3.3°C | 17.8°C | 0.2°C | 136 mm | 90% | 2.9 m/s | 1.5 |
| 1993 | 11.1°C | 7.5°C | 3.8°C | 16.3°C | 0.9°C | 90 mm | 89% | 3 m/s | 1.5 |
| 1992 ❄️ | 8.3°C | 4.7°C | 1.2°C | 12.4°C | -2.2°C | 62 mm | 90% | 3 m/s | 1.5 |
| 1991 | 10.0°C | 7.0°C | 4.1°C | 14.2°C | 1.7°C | 100 mm | 91% | 3.4 m/s | 1.4 |
| 1990 | 10.7°C | 7.7°C | 4.6°C | 15.8°C | 0.9°C | 157 mm | 89% | 4 m/s | 1.4 |
| 1989 | 10.7°C | 6.9°C | 3.2°C | 16.9°C | -2.5°C | 65 mm | 89% | 2.5 m/s | 1.5 |
| 1988 | 8.2°C | 4.8°C | 1.5°C | 16.7°C | -4.1°C | 160 mm | 89% | 3.4 m/s | 1.3 |
| 1987 | 11.7°C | 8.0°C | 4.3°C | 18.2°C | -0.5°C | 60 mm | 88% | 3.1 m/s | 1.4 |
| 1986 | 11.1°C | 7.5°C | 4.0°C | 17.6°C | -1.5°C | 140 mm | 88% | 3 m/s | 1.5 |
| 1985 | 10.9°C | 7.1°C | 3.3°C | 17.2°C | -1.5°C | 112 mm | 88% | 2.2 m/s | 1.5 |
| 1984 | 9.3°C | 5.9°C | 2.5°C | 15.0°C | -1.9°C | 111 mm | 90% | 2.9 m/s | 1.5 |
| 1983 | 9.1°C | 5.8°C | 2.5°C | 14.8°C | -2.2°C | 126 mm | 90% | 3.4 m/s | — |
| 1982 | 11.0°C | 7.5°C | 4.1°C | 17.2°C | -0.2°C | 162 mm | 88% | 3.4 m/s | — |
| 1981 | 11.4°C | 7.4°C | 3.5°C | 17.4°C | -1.3°C | 75 mm | 88% | 2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 11°C with lows near 3.8°C (mean 7.4°C), based on 45 years of NASA POWER data.
May averages 111 mm of rainfall in Glencoe, a relatively wet time of year. The wettest on record was 174 mm in 2009.
The hottest May reached 21.2°C in 2023. The coldest dipped to -4.1°C in 1988.
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 10.3°C to 12°C and overnight lows from 3.2°C to 4.5°C over the same span.
May is one of the cooler months of the year in Glencoe and a relatively wet time of year, so plan for around 11°C daytime highs and 3.8°C at night.
Not quite — May is the 4th coolest month in Glencoe, averaging 7.4°C.
For May in Glencoe, pack warm layers and a jacket for chilly mornings, with typical highs of 11°C and lows of 3.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 89% — quite humid.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 4 m/s (1990).
The wettest May on record was 2009 with 174 mm. On average, May sees 111 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 Glencoe 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.
