May is one of the warmer months of the year in St. Clements, with average highs near 17°C and lows around 7.2°C (mean 12.1°C). It is a relatively wet time of year, averaging 68 mm of rainfall and 67% relative humidity across the period.
May is one of the warmer months of the year in St. Clements. Across 45 years of records, the warmest May in St. Clements was 2023 — when the month averaged 15.7°C — while the coldest was 2004 at 8.2°C. Typical May days reach 17°C with nights near 7.2°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in St. Clements, averaging 68 mm of rainfall. The wettest May on record was 2010 with 169 mm, while the driest were 2020 and 2023 at 24 mm.
Relative humidity in St. Clements during May averages 67%. The most humid May was 2022 at 76%, and the least humid was 2003 at 59%.
May receives about 5.6 kWh/m²/day of solar energy in St. Clements. The sunniest May was 2025 at 6.5 kWh/m²/day, and the cloudiest was 2022 at 4.5.
Average wind speed in St. Clements during May is 4 m/s. The windiest May was 1999 at 4.9 m/s, while the calmest was 1995 at 3.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.6°C | 12.0°C | 11.2°C | 12.1°C | 12.8°C | +0.2°C |
| Avg High | 17.8°C | 17.1°C | 16.0°C | 16.8°C | 17.7°C | -0.1°C |
| Avg Low | 7.4°C | 6.9°C | 6.4°C | 7.5°C | 7.9°C | +0.5°C |
| Avg Rain | 53 mm | 63 mm | 82 mm | 78 mm | 62 mm | +9 mm |
May temperatures in St. Clements have risen by about 1.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.7°C (1989) to a record high of 30.8°C (1988).
Rainfall in May is a relatively wet time of year, averaging 68 mm, with a wettest year of 169 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A good time to visit St. Clements
May is a good time to visit St. Clements, with days averaging 17°C and nights around 7.2°C (mean 12.1°C, warmer than St. Clements'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 | 20.3°C | 14.5°C | 8.8°C | 29.8°C | 0.5°C | 27 mm | 63% | 4 m/s | 6.5 |
| 2024 | 16.3°C | 12.0°C | 7.7°C | 25.2°C | 3.0°C | 94 mm | 73% | 4 m/s | 4.8 |
| 2023 🔥 | 20.8°C | 15.7°C | 10.7°C | 28.9°C | 2.1°C | 24 mm | 67% | 4 m/s | 5.7 |
| 2022 | 15.6°C | 11.2°C | 6.8°C | 22.0°C | -1.0°C | 148 mm | 76% | 4.6 m/s | 4.5 |
| 2021 | 16.8°C | 11.5°C | 6.2°C | 27.7°C | 0.4°C | 57 mm | 65% | 4 m/s | 6.1 |
| 2020 | 16.2°C | 11.6°C | 7.0°C | 26.3°C | -2.3°C | 24 mm | 65% | 4.3 m/s | 6.1 |
| 2019 | 15.0°C | 10.3°C | 5.7°C | 22.9°C | -1.4°C | 34 mm | 65% | 3.8 m/s | 6.3 |
| 2018 | 20.1°C | 14.9°C | 9.8°C | 28.0°C | 1.2°C | 61 mm | 66% | 3.5 m/s | 6 |
| 2017 | 16.1°C | 11.7°C | 7.2°C | 21.0°C | 1.6°C | 39 mm | 69% | 4.1 m/s | 5.6 |
| 2016 | 18.6°C | 13.8°C | 9.0°C | 28.5°C | -1.7°C | 61 mm | 69% | 3.9 m/s | 5.5 |
| 2015 | 16.3°C | 11.3°C | 6.3°C | 25.8°C | -0.2°C | 74 mm | 69% | 3.9 m/s | 5.8 |
| 2014 | 15.9°C | 11.5°C | 7.2°C | 28.0°C | -0.4°C | 66 mm | 72% | 3.7 m/s | 5.1 |
| 2013 | 15.9°C | 11.3°C | 6.7°C | 23.0°C | -3.4°C | 81 mm | 69% | 4.3 m/s | 5.3 |
| 2012 | 16.9°C | 12.5°C | 8.0°C | 25.3°C | 3.0°C | 115 mm | 68% | 4.2 m/s | 5.3 |
| 2011 | 16.0°C | 11.5°C | 7.0°C | 23.8°C | -2.4°C | 83 mm | 73% | 4.2 m/s | 5.1 |
| 2010 🌧️ | 16.8°C | 12.6°C | 8.4°C | 26.4°C | -0.3°C | 169 mm | 70% | 4 m/s | 4.9 |
| 2009 | 13.5°C | 8.7°C | 4.0°C | 20.6°C | -1.9°C | 77 mm | 70% | 4.2 m/s | 5.8 |
| 2008 | 14.4°C | 9.6°C | 4.8°C | 23.3°C | -1.8°C | 43 mm | 64% | 3.8 m/s | 6.2 |
| 2007 | 18.0°C | 13.0°C | 8.0°C | 27.4°C | 2.0°C | 111 mm | 71% | 4.5 m/s | 4.8 |
| 2006 | 17.3°C | 13.0°C | 8.6°C | 26.0°C | 1.3°C | 73 mm | 71% | 3.8 m/s | 5.1 |
| 2005 | 15.1°C | 10.9°C | 6.7°C | 24.4°C | -2.6°C | 89 mm | 72% | 4 m/s | 4.9 |
| 2004 ❄️ | 12.6°C | 8.2°C | 3.9°C | 22.0°C | -1.7°C | 140 mm | 67% | 4.5 m/s | 5 |
| 2003 | 19.7°C | 14.1°C | 8.6°C | 25.3°C | -0.7°C | 65 mm | 59% | 3.9 m/s | 6 |
| 2002 | 14.2°C | 9.0°C | 3.7°C | 26.3°C | -1.9°C | 49 mm | 62% | 4.5 m/s | 6.1 |
| 2001 | 18.0°C | 13.3°C | 8.7°C | 25.6°C | 3.9°C | 107 mm | 71% | 4.6 m/s | 5.4 |
| 2000 | 16.8°C | 12.0°C | 7.3°C | 25.6°C | 1.2°C | 60 mm | 67% | 3.8 m/s | 5.2 |
| 1999 | 16.8°C | 12.5°C | 8.2°C | 27.0°C | 2.1°C | 105 mm | 68% | 4.9 m/s | 4.8 |
| 1998 | 19.3°C | 13.9°C | 8.5°C | 26.1°C | 3.3°C | 118 mm | 65% | 3.9 m/s | 6 |
| 1997 | 14.2°C | 9.1°C | 4.0°C | 26.3°C | -1.9°C | 44 mm | 66% | 4.1 m/s | 5.8 |
| 1996 | 15.4°C | 10.4°C | 5.5°C | 24.0°C | -1.0°C | 66 mm | 64% | 3.5 m/s | 5.9 |
| 1995 | 16.3°C | 11.4°C | 6.5°C | 29.0°C | 0.3°C | 66 mm | 67% | 3.4 m/s | 5.8 |
| 1994 | 18.6°C | 13.1°C | 7.7°C | 27.7°C | -1.2°C | 47 mm | 64% | 4.3 m/s | 5.8 |
| 1993 | 17.0°C | 12.0°C | 7.0°C | 26.5°C | 1.4°C | 30 mm | 62% | 4 m/s | 5.7 |
| 1992 | 17.5°C | 12.0°C | 6.5°C | 28.8°C | -0.1°C | 35 mm | 67% | 4.2 m/s | 6 |
| 1991 | 19.5°C | 14.6°C | 9.7°C | 27.1°C | -1.4°C | 67 mm | 68% | 3.7 m/s | 5.3 |
| 1990 | 16.1°C | 10.7°C | 5.3°C | 25.8°C | -3.3°C | 52 mm | 64% | 3.6 m/s | 6.2 |
| 1989 | 19.0°C | 13.2°C | 7.5°C | 28.3°C | -5.7°C | 52 mm | 63% | 3.9 m/s | 6.3 |
| 1988 | 19.7°C | 14.4°C | 9.1°C | 30.8°C | 1.2°C | 45 mm | 65% | 4.3 m/s | 5.6 |
| 1987 | 20.5°C | 14.8°C | 9.2°C | 28.5°C | 0.8°C | 35 mm | 63% | 4.1 m/s | 5.8 |
| 1986 | 18.8°C | 13.6°C | 8.4°C | 30.6°C | -2.8°C | 39 mm | 70% | 4.1 m/s | 5.9 |
| 1985 | 18.6°C | 13.6°C | 8.5°C | 25.5°C | 3.0°C | 114 mm | 67% | 4 m/s | 5.8 |
| 1984 | 15.0°C | 10.2°C | 5.4°C | 28.3°C | -4.0°C | 48 mm | 65% | 4.2 m/s | 5.4 |
| 1983 | 13.6°C | 8.6°C | 3.5°C | 21.3°C | -4.0°C | 43 mm | 66% | 4.4 m/s | — |
| 1982 | 17.8°C | 13.2°C | 8.6°C | 27.0°C | 0.8°C | 56 mm | 72% | 3.9 m/s | — |
| 1981 | 17.6°C | 12.1°C | 6.5°C | 26.3°C | -3.2°C | 46 mm | 61% | 3.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 17°C with lows near 7.2°C (mean 12.1°C), based on 45 years of NASA POWER data.
May averages 68 mm of rainfall in St. Clements, a relatively wet time of year. The wettest on record was 169 mm in 2010.
The hottest May reached 30.8°C in 1988. The coldest dipped to -5.7°C in 1989.
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 16.5°C to 18°C and overnight lows from 6.5°C to 8°C over the same span.
May is one of the warmer months of the year in St. Clements and a relatively wet time of year, so plan for around 17°C daytime highs and 7.2°C at night.
Not quite — May is the 8th coolest month in St. Clements, averaging 12.1°C.
For May in St. Clements, pack warm layers and a jacket for chilly mornings, with typical highs of 17°C and lows of 7.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 67% — moderately humid.
Average wind speed in May is 4 m/s. The windiest May on record averaged 4.9 m/s (1999).
The wettest May on record was 2010 with 169 mm. On average, May sees 68 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 St. Clements 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.
