May is one of the warmer months of the year in Barry, with average highs near 15.3°C and lows around 7.7°C (mean 11.5°C). It is one of the drier months, averaging 64 mm of rainfall and 82% relative humidity across the period.
May is one of the warmer months of the year in Barry. Across 45 years of records, the warmest May in Barry was 2025 — when the month averaged 13.2°C — while the coldest was 1996 at 8.9°C. Typical May days reach 15.3°C with nights near 7.7°C. The long-term trend is warming, about 0.3°C per decade.
May is one of the drier months in Barry, averaging 64 mm of rainfall. The wettest May on record was 2021 with 143 mm, while the driest were 1991 and 2020 at 11 mm.
Relative humidity in Barry during May averages 82%. The most humid May was 1981 at 87%, and the least humid was 1990 at 78%.
May receives about 5 kWh/m²/day of solar energy in Barry. The sunniest May was 2020 at 6.4 kWh/m²/day, and the cloudiest was 1993 at 4.2.
Average wind speed in Barry during May is 3.5 m/s. The windiest May was 2011 at 4.7 m/s, while the calmest was 2004 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.7°C | 11.4°C | 11.7°C | 11.5°C | 12.3°C | +1.6°C |
| Avg High | 14.5°C | 15.4°C | 15.3°C | 15.2°C | 16.2°C | +1.7°C |
| Avg Low | 7.0°C | 7.5°C | 8.1°C | 7.7°C | 8.3°C | +1.3°C |
| Avg Rain | 63 mm | 51 mm | 77 mm | 65 mm | 67 mm | +4 mm |
May temperatures in Barry have risen by about 1.9°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 1.3°C (1996) to a record high of 24.2°C (1989).
Rainfall in May is one of the drier months, averaging 64 mm, with a wettest year of 143 mm.
A good time to visit Barry
May is a good time to visit Barry, with days averaging 15.3°C and nights around 7.7°C (mean 11.5°C, warmer than Barry's yearly average) and moderate 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 🔥 | 17.6°C | 13.2°C | 8.7°C | 22.5°C | 3.1°C | 33 mm | 80% | 3.3 m/s | 5.8 |
| 2024 | 16.8°C | 13.1°C | 9.5°C | 21.1°C | 5.8°C | 89 mm | 84% | 2.8 m/s | 4.8 |
| 2023 | 16.8°C | 12.5°C | 8.2°C | 19.5°C | 5.0°C | 49 mm | 83% | 3.1 m/s | 5.8 |
| 2022 | 16.1°C | 12.5°C | 8.8°C | 19.7°C | 6.9°C | 76 mm | 84% | 3.2 m/s | 5 |
| 2021 🌧️ | 13.2°C | 10.1°C | 7.1°C | 19.9°C | 2.4°C | 143 mm | 83% | 3.9 m/s | 4.7 |
| 2020 | 16.8°C | 12.1°C | 7.5°C | 22.1°C | 1.5°C | 11 mm | 78% | 3.4 m/s | 6.4 |
| 2019 | 15.3°C | 11.2°C | 7.1°C | 18.6°C | 2.1°C | 38 mm | 81% | 2.9 m/s | 5.1 |
| 2018 | 16.8°C | 12.6°C | 8.4°C | 22.0°C | 2.6°C | 54 mm | 82% | 2.6 m/s | 5.4 |
| 2017 | 16.5°C | 12.6°C | 8.6°C | 22.6°C | 4.0°C | 56 mm | 84% | 3.3 m/s | 5 |
| 2016 | 16.0°C | 11.9°C | 7.9°C | 19.4°C | 3.5°C | 71 mm | 83% | 3.2 m/s | 5.2 |
| 2015 | 13.9°C | 10.7°C | 7.5°C | 18.6°C | 4.7°C | 92 mm | 83% | 4.3 m/s | 4.9 |
| 2014 | 15.2°C | 11.9°C | 8.6°C | 19.3°C | 4.2°C | 105 mm | 84% | 3.3 m/s | 4.6 |
| 2013 | 13.5°C | 9.9°C | 6.2°C | 18.7°C | 2.4°C | 76 mm | 83% | 3.9 m/s | 4.9 |
| 2012 | 15.5°C | 11.6°C | 7.8°C | 22.9°C | 2.5°C | 60 mm | 83% | 3.2 m/s | 5.1 |
| 2011 | 15.0°C | 11.6°C | 8.2°C | 18.8°C | 2.7°C | 56 mm | 82% | 4.7 m/s | 4.9 |
| 2010 | 14.6°C | 10.7°C | 6.7°C | 22.3°C | 1.7°C | 42 mm | 81% | 2.8 m/s | 5.1 |
| 2009 | 15.2°C | 11.6°C | 8.0°C | 21.4°C | 4.7°C | 48 mm | 83% | 4.2 m/s | 5.1 |
| 2008 | 16.8°C | 12.8°C | 8.9°C | 22.6°C | 4.0°C | 87 mm | 84% | 3.4 m/s | 4.6 |
| 2007 | 15.2°C | 11.8°C | 8.4°C | 19.7°C | 4.6°C | 116 mm | 83% | 4.1 m/s | 4.9 |
| 2006 | 15.1°C | 11.7°C | 8.3°C | 20.1°C | 5.0°C | 116 mm | 85% | 3.8 m/s | 4.6 |
| 2005 | 14.4°C | 10.7°C | 7.0°C | 21.3°C | 2.3°C | 39 mm | 81% | 4 m/s | 5.3 |
| 2004 | 15.8°C | 12.1°C | 8.4°C | 20.7°C | 4.8°C | 45 mm | 82% | 2.5 m/s | 5 |
| 2003 | 14.7°C | 11.4°C | 8.1°C | 22.6°C | 4.5°C | 74 mm | 84% | 3.9 m/s | 4.6 |
| 2002 | 14.7°C | 11.4°C | 8.1°C | 20.6°C | 4.0°C | 113 mm | 84% | 4.2 m/s | 4.5 |
| 2001 | 16.1°C | 11.8°C | 7.5°C | 20.6°C | 2.5°C | 38 mm | 83% | 3.1 m/s | 5.1 |
| 2000 | 15.2°C | 11.5°C | 7.9°C | 20.2°C | 4.9°C | 89 mm | 85% | 3.6 m/s | 4.8 |
| 1999 | 15.9°C | 12.5°C | 9.1°C | 20.1°C | 6.0°C | 58 mm | 85% | 3.7 m/s | 4.3 |
| 1998 | 16.7°C | 12.7°C | 8.8°C | 21.9°C | 3.2°C | 34 mm | 83% | 3.2 m/s | 6.2 |
| 1997 | 15.2°C | 11.1°C | 7.1°C | 21.3°C | 2.5°C | 73 mm | 83% | 3.5 m/s | 5 |
| 1996 ❄️ | 12.7°C | 8.9°C | 5.1°C | 18.0°C | 1.3°C | 79 mm | 80% | 4.1 m/s | 4.5 |
| 1995 | 15.1°C | 11.1°C | 7.0°C | 22.4°C | 2.0°C | 49 mm | 80% | 3.3 m/s | 5 |
| 1994 | 13.9°C | 10.4°C | 6.8°C | 16.9°C | 2.9°C | 81 mm | 83% | 3.3 m/s | 4.6 |
| 1993 | 14.9°C | 11.1°C | 7.4°C | 20.3°C | 2.1°C | 73 mm | 83% | 4.3 m/s | 4.2 |
| 1992 | 17.2°C | 12.7°C | 8.2°C | 22.9°C | 3.4°C | 34 mm | 80% | 3.4 m/s | 5.8 |
| 1991 | 15.3°C | 11.1°C | 6.9°C | 19.7°C | 2.4°C | 11 mm | 81% | 3.1 m/s | 4.6 |
| 1990 | 17.3°C | 12.7°C | 8.1°C | 23.2°C | 5.8°C | 21 mm | 78% | 2.8 m/s | 5.5 |
| 1989 | 17.5°C | 13.1°C | 8.6°C | 24.2°C | 5.0°C | 14 mm | 81% | 2.8 m/s | 5.6 |
| 1988 | 15.4°C | 11.5°C | 7.7°C | 20.7°C | 4.4°C | 60 mm | 82% | 3.4 m/s | 5 |
| 1987 | 13.9°C | 10.0°C | 6.1°C | 18.5°C | 2.1°C | 37 mm | 82% | 3.7 m/s | 4.5 |
| 1986 | 13.3°C | 10.1°C | 6.9°C | 16.9°C | 4.4°C | 86 mm | 85% | 4.5 m/s | 4.5 |
| 1985 | 14.5°C | 10.6°C | 6.7°C | 18.6°C | 2.7°C | 54 mm | 83% | 3.2 m/s | 4.6 |
| 1984 | 14.0°C | 10.0°C | 6.0°C | 19.7°C | 2.1°C | 61 mm | 80% | 3.2 m/s | 4.7 |
| 1983 | 12.9°C | 9.8°C | 6.6°C | 16.9°C | 4.6°C | 111 mm | 86% | 3.4 m/s | — |
| 1982 | 14.7°C | 10.8°C | 6.8°C | 20.5°C | 1.6°C | 29 mm | 81% | 3.2 m/s | — |
| 1981 | 13.9°C | 10.8°C | 7.7°C | 19.5°C | 3.5°C | 114 mm | 87% | 3.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 15.3°C with lows near 7.7°C (mean 11.5°C), based on 45 years of NASA POWER data.
May averages 64 mm of rainfall in Barry, one of the drier months. The wettest on record was 143 mm in 2021.
The hottest May reached 24.2°C in 1989. The coldest dipped to 1.3°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.9°C. Daytime highs moved from 14°C to 16.1°C and overnight lows from 6.8°C to 8.5°C over the same span.
May is one of the warmer months of the year in Barry and one of the drier months, so plan for around 15.3°C daytime highs and 7.7°C at night.
Not quite — May is the 8th coolest month in Barry, averaging 11.5°C.
For May in Barry, pack warm layers and a jacket for chilly mornings, with typical highs of 15.3°C and lows of 7.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 82% — quite humid.
Average wind speed in May is 3.5 m/s. The windiest May on record averaged 4.7 m/s (2011).
The wettest May on record was 2021 with 143 mm. On average, May sees 64 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 Barry 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.
