May is one of the warmer months of the year in Berwyn, with average highs near 14.8°C and lows around 8.4°C (mean 11.6°C). It is a relatively wet time of year, averaging 106 mm of rainfall and 82% relative humidity across the period.
May is one of the warmer months of the year in Berwyn. Across 45 years of records, the warmest May in Berwyn was 2024 — when the month averaged 15°C — while the coldest were 1996 and 1997 at 8.8°C. Typical May days reach 14.8°C with nights near 8.4°C. The long-term trend is warming, about 0.6°C per decade.
May is a relatively wet time of year in Berwyn, averaging 106 mm of rainfall. The wettest May on record was 1996 with 226 mm, while the driest was 1992 at 16 mm.
Relative humidity in Berwyn during May averages 82%. The most humid May was 1991 at 89%, and the least humid was 2023 at 75%.
May receives about 5.4 kWh/m²/day of solar energy in Berwyn. The sunniest May was 1994 at 6.7 kWh/m²/day, and the cloudiest was 1996 at 4.4.
Average wind speed in Berwyn during May is 3.6 m/s. The windiest Mays were 1997 and 2002 at 4.1 m/s, while the calmest was 1982 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.8°C | 10.9°C | 11.4°C | 12.5°C | 12.7°C | +1.9°C |
| Avg High | 14.2°C | 14.1°C | 14.7°C | 15.6°C | 15.8°C | +1.6°C |
| Avg Low | 7.5°C | 7.7°C | 8.1°C | 9.3°C | 9.7°C | +2.2°C |
| Avg Rain | 101 mm | 104 mm | 104 mm | 125 mm | 91 mm | -10 mm |
May temperatures in Berwyn have risen by about 2.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 0°C (1989) to a record high of 29°C (2018).
Rainfall in May is a relatively wet time of year, averaging 106 mm, with a wettest year of 226 mm.
A good time to visit Berwyn
May is a good time to visit Berwyn, with days averaging 14.8°C and nights around 8.4°C (mean 11.6°C, warmer than Berwyn's yearly average) and higher rainfall. August and July 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 | 14.0°C | 11.3°C | 8.6°C | 20.8°C | 5.5°C | 54 mm | 83% | 3.7 m/s | 5.6 |
| 2024 🔥 | 18.3°C | 15.0°C | 11.7°C | 23.3°C | 8.7°C | 114 mm | 80% | 3.5 m/s | 6.1 |
| 2023 | 16.2°C | 12.7°C | 9.2°C | 25.7°C | 3.4°C | 27 mm | 75% | 3.4 m/s | 6.1 |
| 2022 | 15.9°C | 13.2°C | 10.5°C | 23.0°C | 4.4°C | 92 mm | 84% | 3.9 m/s | 5.1 |
| 2021 | 15.9°C | 12.8°C | 9.8°C | 26.3°C | 2.4°C | 64 mm | 75% | 3.6 m/s | 5.4 |
| 2020 | 14.3°C | 11.2°C | 8.2°C | 24.0°C | 0.8°C | 198 mm | 84% | 3.5 m/s | 5.6 |
| 2019 | 14.4°C | 11.2°C | 7.9°C | 20.4°C | 4.6°C | 174 mm | 85% | 3.6 m/s | 4.8 |
| 2018 | 18.0°C | 14.5°C | 10.9°C | 29.0°C | 5.8°C | 167 mm | 85% | 3.1 m/s | 5.7 |
| 2017 | 13.7°C | 11.1°C | 8.5°C | 20.6°C | 4.1°C | 87 mm | 84% | 4 m/s | 5.6 |
| 2016 | 15.6°C | 12.6°C | 9.6°C | 24.0°C | 3.2°C | 109 mm | 80% | 3.5 m/s | 5.6 |
| 2015 | 16.1°C | 12.9°C | 9.6°C | 22.3°C | 3.8°C | 107 mm | 82% | 3.7 m/s | 5 |
| 2014 | 15.2°C | 11.8°C | 8.4°C | 23.8°C | 3.3°C | 123 mm | 82% | 3.5 m/s | 5.7 |
| 2013 | 15.5°C | 12.5°C | 9.5°C | 24.3°C | 3.3°C | 104 mm | 84% | 3.5 m/s | 5.3 |
| 2012 | 18.0°C | 14.7°C | 11.5°C | 27.8°C | 6.7°C | 77 mm | 78% | 3.6 m/s | 6.3 |
| 2011 | 13.4°C | 10.6°C | 7.9°C | 22.0°C | 2.7°C | 146 mm | 89% | 3.9 m/s | 4.7 |
| 2010 | 15.8°C | 12.7°C | 9.6°C | 26.7°C | 3.5°C | 152 mm | 83% | 3.4 m/s | 5.2 |
| 2009 | 14.9°C | 11.4°C | 7.9°C | 19.8°C | 3.8°C | 89 mm | 81% | 3.3 m/s | 5.6 |
| 2008 | 12.7°C | 9.6°C | 6.6°C | 21.9°C | 3.7°C | 83 mm | 82% | 3.7 m/s | 5.2 |
| 2007 | 16.7°C | 13.0°C | 9.4°C | 23.3°C | 4.7°C | 53 mm | 81% | 3.5 m/s | 5.8 |
| 2006 | 15.2°C | 12.1°C | 9.1°C | 23.7°C | 3.7°C | 95 mm | 82% | 3.2 m/s | 5.4 |
| 2005 | 14.5°C | 11.1°C | 7.8°C | 19.7°C | 1.3°C | 42 mm | 77% | 3.5 m/s | 5.6 |
| 2004 | 15.8°C | 12.3°C | 8.8°C | 24.3°C | 2.8°C | 180 mm | 86% | 3.7 m/s | 5 |
| 2003 | 12.3°C | 9.3°C | 6.3°C | 19.0°C | 2.7°C | 119 mm | 85% | 3.8 m/s | 5.2 |
| 2002 | 13.3°C | 9.9°C | 6.4°C | 20.5°C | 2.2°C | 131 mm | 82% | 4.1 m/s | 5.3 |
| 2001 | 15.1°C | 11.9°C | 8.7°C | 23.3°C | 4.8°C | 114 mm | 81% | 3.6 m/s | 5 |
| 2000 | 16.8°C | 13.3°C | 9.9°C | 21.4°C | 5.3°C | 138 mm | 82% | 3.7 m/s | 4.5 |
| 1999 | 16.2°C | 12.9°C | 9.7°C | 23.6°C | 6.4°C | 86 mm | 81% | 3.7 m/s | 5.7 |
| 1998 | 17.3°C | 14.3°C | 11.2°C | 25.5°C | 7.1°C | 93 mm | 83% | 3.1 m/s | 5.9 |
| 1997 | 12.1°C | 8.8°C | 5.6°C | 19.9°C | 2.9°C | 103 mm | 79% | 4.1 m/s | 5.2 |
| 1996 ❄️ 🌧️ | 12.3°C | 8.8°C | 5.4°C | 22.2°C | 1.9°C | 226 mm | 85% | 3.5 m/s | 4.4 |
| 1995 | 13.1°C | 10.2°C | 7.2°C | 19.8°C | 3.6°C | 112 mm | 81% | 3.4 m/s | 4.9 |
| 1994 | 13.4°C | 9.8°C | 6.2°C | 22.2°C | 1.2°C | 28 mm | 76% | 3.1 m/s | 6.7 |
| 1993 | 14.0°C | 10.7°C | 7.5°C | 20.3°C | 3.5°C | 70 mm | 84% | 3.5 m/s | 5.4 |
| 1992 | 13.6°C | 10.3°C | 6.9°C | 20.4°C | 2.9°C | 16 mm | 77% | 3.4 m/s | 5.9 |
| 1991 | 16.9°C | 14.1°C | 11.3°C | 23.6°C | 3.3°C | 127 mm | 89% | 3.2 m/s | 5.3 |
| 1990 | 12.2°C | 9.3°C | 6.4°C | 17.6°C | 2.2°C | 175 mm | 83% | 3.9 m/s | 5 |
| 1989 | 13.5°C | 10.2°C | 6.9°C | 21.7°C | 0.0°C | 102 mm | 79% | 3.4 m/s | 5.4 |
| 1988 | 14.8°C | 11.0°C | 7.3°C | 25.3°C | 3.6°C | 38 mm | 77% | 3.4 m/s | 6.4 |
| 1987 | 16.3°C | 12.9°C | 9.6°C | 21.5°C | 3.8°C | 127 mm | 83% | 3.3 m/s | 5.9 |
| 1986 | 13.7°C | 10.7°C | 7.7°C | 21.9°C | 2.8°C | 101 mm | 85% | 3.4 m/s | 5.1 |
| 1985 | 15.0°C | 11.6°C | 8.1°C | 22.3°C | 3.9°C | 69 mm | 79% | 3.7 m/s | 5.7 |
| 1984 | 12.2°C | 8.9°C | 5.6°C | 18.5°C | 2.4°C | 135 mm | 83% | 3.6 m/s | 5 |
| 1983 | 12.4°C | 9.4°C | 6.4°C | 18.6°C | 1.8°C | 119 mm | 84% | 3.8 m/s | — |
| 1982 | 16.4°C | 12.7°C | 8.9°C | 21.7°C | 4.2°C | 104 mm | 86% | 2.9 m/s | — |
| 1981 | 13.1°C | 10.0°C | 7.0°C | 19.8°C | 2.8°C | 119 mm | 79% | 4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 14.8°C with lows near 8.4°C (mean 11.6°C), based on 45 years of NASA POWER data.
May averages 106 mm of rainfall in Berwyn, a relatively wet time of year. The wettest on record was 226 mm in 1996.
The hottest May reached 29°C in 2018. The coldest dipped to 0°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.5°C. Daytime highs moved from 13.8°C to 16.1°C and overnight lows from 7.2°C to 10°C over the same span.
May is one of the warmer months of the year in Berwyn and a relatively wet time of year, so plan for around 14.8°C daytime highs and 8.4°C at night.
Not quite — May is the 7th coolest month in Berwyn, averaging 11.6°C.
For May in Berwyn, pack light layers you can adjust through the day, with typical highs of 14.8°C and lows of 8.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 82% — quite humid.
Average wind speed in May is 3.6 m/s. The windiest May on record averaged 4.1 m/s (1997).
The wettest May on record was 1996 with 226 mm. On average, May sees 106 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 Berwyn 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.
