May is one of the warmer months of the year in Greenock, with average highs near 12.6°C and lows around 6.3°C (mean 9.5°C). It is one of the drier months, averaging 89 mm of rainfall and 84% relative humidity across the period.
May is one of the warmer months of the year in Greenock. Across 45 years of records, the warmest May in Greenock was 2024 — when the month averaged 12.7°C — while the coldest was 1996 at 7.1°C. Typical May days reach 12.6°C with nights near 6.3°C. The long-term trend is warming, about 0.3°C per decade.
May is one of the drier months in Greenock, averaging 89 mm of rainfall. The wettest May on record was 1986 with 197 mm, while the driest was 1984 at 22 mm.
Relative humidity in Greenock 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 Greenock. The sunniest May was 2025 at 5.9 kWh/m²/day, and the cloudiest were 1986 and 2003 at 4.
Average wind speed in Greenock during May is 3.8 m/s. The windiest May was 2011 at 5.7 m/s, while the calmest was 1990 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.0°C | 9.2°C | 9.7°C | 9.3°C | 10.5°C | +1.5°C |
| Avg High | 12.2°C | 12.4°C | 12.8°C | 12.4°C | 13.7°C | +1.5°C |
| Avg Low | 5.8°C | 6.0°C | 6.6°C | 6.2°C | 7.3°C | +1.5°C |
| Avg Rain | 90 mm | 74 mm | 99 mm | 99 mm | 82 mm | -8 mm |
May temperatures in Greenock have risen by about 1.7°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -0.6°C (1982) to a record high of 21.8°C (2012).
Rainfall in May is one of the drier months, averaging 89 mm, with a wettest year of 197 mm.
A good time to visit Greenock
May is a good time to visit Greenock, with days averaging 12.6°C and nights around 6.3°C (mean 9.5°C, warmer than Greenock'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 | 15.3°C | 11.2°C | 7.1°C | 20.2°C | 2.4°C | 63 mm | 80% | 3.3 m/s | 5.9 |
| 2024 🔥 | 15.8°C | 12.7°C | 9.6°C | 20.4°C | 7.4°C | 88 mm | 87% | 3 m/s | 4.3 |
| 2023 | 14.1°C | 10.8°C | 7.5°C | 19.9°C | 5.3°C | 42 mm | 85% | 3 m/s | 5 |
| 2022 | 12.9°C | 10.4°C | 7.8°C | 16.9°C | 5.2°C | 127 mm | 86% | 4.4 m/s | 4.2 |
| 2021 | 11.1°C | 8.2°C | 5.3°C | 18.2°C | 0.2°C | 100 mm | 84% | 3.5 m/s | 4.6 |
| 2020 | 13.0°C | 9.7°C | 6.4°C | 19.2°C | -0.2°C | 72 mm | 82% | 3.7 m/s | 5.3 |
| 2019 | 12.2°C | 9.0°C | 5.8°C | 18.3°C | 0.8°C | 95 mm | 81% | 3.1 m/s | 4.9 |
| 2018 | 14.2°C | 10.8°C | 7.3°C | 21.4°C | 3.0°C | 58 mm | 85% | 3.6 m/s | 5 |
| 2017 | 14.5°C | 10.8°C | 7.1°C | 21.1°C | 2.7°C | 64 mm | 83% | 3.6 m/s | 5.2 |
| 2016 | 13.3°C | 10.0°C | 6.7°C | 18.7°C | 3.1°C | 87 mm | 84% | 3.8 m/s | 5.1 |
| 2015 | 10.0°C | 7.5°C | 5.0°C | 13.1°C | -0.3°C | 147 mm | 85% | 5 m/s | 4.5 |
| 2014 | 12.6°C | 9.9°C | 7.2°C | 17.1°C | 1.9°C | 117 mm | 87% | 3.3 m/s | 4.1 |
| 2013 | 11.3°C | 8.3°C | 5.4°C | 16.8°C | 2.4°C | 120 mm | 86% | 4.5 m/s | 4.4 |
| 2012 | 12.6°C | 9.2°C | 5.7°C | 21.8°C | -0.3°C | 72 mm | 83% | 3.4 m/s | 5.2 |
| 2011 | 11.5°C | 9.2°C | 6.8°C | 15.9°C | 2.6°C | 189 mm | 86% | 5.7 m/s | 4.3 |
| 2010 | 11.9°C | 8.6°C | 5.3°C | 19.1°C | 1.1°C | 43 mm | 83% | 3 m/s | 5.2 |
| 2009 | 12.2°C | 9.3°C | 6.4°C | 20.3°C | 2.8°C | 122 mm | 86% | 4.7 m/s | 4.6 |
| 2008 | 14.9°C | 11.3°C | 7.7°C | 19.6°C | 3.4°C | 40 mm | 82% | 3.4 m/s | 5.1 |
| 2007 | 11.9°C | 9.1°C | 6.2°C | 18.1°C | 2.6°C | 103 mm | 84% | 3.9 m/s | 5.1 |
| 2006 | 12.4°C | 9.2°C | 6.0°C | 19.4°C | 2.5°C | 132 mm | 84% | 4.3 m/s | 4.7 |
| 2005 | 11.6°C | 8.6°C | 5.6°C | 15.5°C | 0.6°C | 125 mm | 84% | 3.9 m/s | 5 |
| 2004 | 13.2°C | 10.2°C | 7.2°C | 18.4°C | 4.5°C | 64 mm | 85% | 3 m/s | 4.9 |
| 2003 | 11.5°C | 9.2°C | 6.8°C | 18.8°C | 3.7°C | 162 mm | 88% | 4.3 m/s | 4 |
| 2002 | 12.6°C | 9.7°C | 6.7°C | 16.7°C | 2.5°C | 135 mm | 86% | 4.1 m/s | 4.1 |
| 2001 | 14.3°C | 10.6°C | 6.9°C | 20.8°C | 2.3°C | 45 mm | 84% | 3.2 m/s | 5 |
| 2000 | 13.2°C | 9.8°C | 6.3°C | 20.1°C | 4.3°C | 60 mm | 83% | 3.5 m/s | 5.4 |
| 1999 | 12.9°C | 10.1°C | 7.3°C | 17.0°C | 3.9°C | 129 mm | 86% | 4 m/s | 4.5 |
| 1998 | 13.4°C | 10.1°C | 6.8°C | 19.7°C | 2.8°C | 53 mm | 86% | 3.7 m/s | 5 |
| 1997 | 12.5°C | 9.3°C | 6.1°C | 18.8°C | -0.3°C | 90 mm | 84% | 3.5 m/s | 4.9 |
| 1996 ❄️ | 10.2°C | 7.1°C | 3.9°C | 14.0°C | -0.3°C | 86 mm | 83% | 3.7 m/s | 4.5 |
| 1995 | 11.4°C | 8.5°C | 5.6°C | 17.0°C | 0.0°C | 80 mm | 84% | 3.9 m/s | 4.8 |
| 1994 | 11.9°C | 8.4°C | 4.8°C | 16.6°C | 1.3°C | 37 mm | 81% | 4.3 m/s | 5 |
| 1993 | 12.0°C | 8.8°C | 5.6°C | 16.3°C | 2.3°C | 109 mm | 85% | 4 m/s | 4.2 |
| 1992 | 13.5°C | 10.3°C | 7.0°C | 19.5°C | 2.0°C | 69 mm | 85% | 4.8 m/s | 5.3 |
| 1991 | 12.6°C | 9.3°C | 5.9°C | 17.9°C | 1.4°C | 31 mm | 84% | 3.5 m/s | 4.7 |
| 1990 | 14.0°C | 10.6°C | 7.2°C | 20.2°C | 3.6°C | 51 mm | 81% | 2.6 m/s | 5.1 |
| 1989 | 13.0°C | 9.4°C | 5.8°C | 19.5°C | 2.4°C | 49 mm | 83% | 3.8 m/s | 5.1 |
| 1988 | 13.1°C | 9.7°C | 6.2°C | 18.7°C | 2.7°C | 65 mm | 83% | 3.8 m/s | 4.8 |
| 1987 | 11.7°C | 8.4°C | 5.2°C | 16.2°C | 1.7°C | 76 mm | 83% | 3.8 m/s | 4.9 |
| 1986 🌧️ | 10.8°C | 8.4°C | 6.0°C | 14.5°C | 4.2°C | 197 mm | 88% | 5.3 m/s | 4 |
| 1985 | 12.1°C | 8.8°C | 5.4°C | 16.3°C | 0.8°C | 90 mm | 82% | 3.6 m/s | 4.3 |
| 1984 | 13.1°C | 9.3°C | 5.6°C | 19.7°C | 0.6°C | 22 mm | 78% | 2.7 m/s | 5.4 |
| 1983 | 11.1°C | 8.4°C | 5.6°C | 14.6°C | 3.1°C | 107 mm | 84% | 3.5 m/s | — |
| 1982 | 12.2°C | 9.0°C | 5.8°C | 17.9°C | -0.6°C | 87 mm | 83% | 3.9 m/s | — |
| 1981 | 12.7°C | 9.6°C | 6.5°C | 19.3°C | -0.4°C | 117 mm | 85% | 3.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 12.6°C with lows near 6.3°C (mean 9.5°C), based on 45 years of NASA POWER data.
May averages 89 mm of rainfall in Greenock, one of the drier months. The wettest on record was 197 mm in 1986.
The hottest May reached 21.8°C in 2012. The coldest dipped to -0.6°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.7°C. Daytime highs moved from 12.2°C to 13.8°C and overnight lows from 5.8°C to 7.5°C over the same span.
May is one of the warmer months of the year in Greenock and one of the drier months, so plan for around 12.6°C daytime highs and 6.3°C at night.
Not quite — May is the 8th coolest month in Greenock, averaging 9.5°C.
For May in Greenock, pack warm layers and a jacket for chilly mornings, with typical highs of 12.6°C and lows of 6.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 84% — quite humid.
Average wind speed in May is 3.8 m/s. The windiest May on record averaged 5.7 m/s (2011).
The wettest May on record was 1986 with 197 mm. On average, May sees 89 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 Greenock 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.
