May is one of the warmer months of the year in Coleraine, with average highs near 13°C and lows around 7°C (mean 10°C). It is one of the drier months, averaging 78 mm of rainfall and 85% relative humidity across the period.
May is one of the warmer months of the year in Coleraine. Across 45 years of records, the warmest May in Coleraine was 2024 — when the month averaged 12.3°C — while the coldest was 1996 at 7.8°C. Typical May days reach 13°C with nights near 7°C. The long-term trend is warming, about 0.3°C per decade.
May is one of the drier months in Coleraine, averaging 78 mm of rainfall. The wettest May on record was 1981 with 137 mm, while the driest was 1991 at 22 mm.
Relative humidity in Coleraine during May averages 85%. The most humid May was 2014 at 88%, and the least humid was 1984 at 80%.
May receives about 4.9 kWh/m²/day of solar energy in Coleraine. The sunniest May was 2025 at 5.8 kWh/m²/day, and the cloudiest was 1986 at 4.1.
Average wind speed in Coleraine during May is 4 m/s. The windiest May was 2011 at 6.1 m/s, while the calmest was 1990 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.4°C | 9.8°C | 10.2°C | 9.9°C | 10.9°C | +1.5°C |
| Avg High | 12.4°C | 12.9°C | 13.1°C | 12.8°C | 14.1°C | +1.7°C |
| Avg Low | 6.4°C | 6.8°C | 7.2°C | 6.9°C | 7.9°C | +1.5°C |
| Avg Rain | 77 mm | 65 mm | 85 mm | 87 mm | 72 mm | -5 mm |
May temperatures in Coleraine have risen by about 1.8°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 0.8°C (1982) to a record high of 21.3°C (2012).
Rainfall in May is one of the drier months, averaging 78 mm, with a wettest year of 137 mm.
A good time to visit Coleraine
May is a good time to visit Coleraine, with days averaging 13°C and nights around 7°C (mean 10°C, warmer than Coleraine'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 | 15.3°C | 11.8°C | 8.3°C | 18.8°C | 4.6°C | 54 mm | 81% | 3.4 m/s | 5.8 |
| 2024 🔥 | 15.2°C | 12.3°C | 9.4°C | 19.2°C | 6.7°C | 65 mm | 87% | 3.4 m/s | 4.3 |
| 2023 | 14.5°C | 11.2°C | 7.9°C | 18.5°C | 5.8°C | 47 mm | 86% | 3.3 m/s | 4.9 |
| 2022 | 13.9°C | 11.1°C | 8.4°C | 16.7°C | 6.9°C | 100 mm | 85% | 4.5 m/s | 4.6 |
| 2021 | 11.7°C | 8.9°C | 6.2°C | 18.8°C | 1.9°C | 119 mm | 84% | 3.9 m/s | 5.2 |
| 2020 | 13.7°C | 10.4°C | 7.2°C | 19.8°C | 2.1°C | 47 mm | 82% | 4 m/s | 5.2 |
| 2019 | 12.3°C | 9.4°C | 6.4°C | 16.3°C | 2.2°C | 78 mm | 83% | 3.4 m/s | 4.8 |
| 2018 | 14.8°C | 11.2°C | 7.7°C | 20.6°C | 3.8°C | 66 mm | 85% | 3.7 m/s | 5 |
| 2017 | 15.0°C | 11.3°C | 7.7°C | 20.7°C | 4.3°C | 65 mm | 84% | 3.5 m/s | 5.1 |
| 2016 | 13.7°C | 10.4°C | 7.2°C | 18.9°C | 4.7°C | 61 mm | 85% | 3.9 m/s | 5.4 |
| 2015 | 10.8°C | 8.3°C | 5.8°C | 14.6°C | 2.4°C | 135 mm | 85% | 5.1 m/s | 4.5 |
| 2014 | 13.0°C | 10.6°C | 8.1°C | 17.2°C | 4.9°C | 124 mm | 88% | 3.5 m/s | 4.2 |
| 2013 | 11.5°C | 8.7°C | 6.0°C | 15.2°C | 1.9°C | 114 mm | 86% | 4.9 m/s | 4.3 |
| 2012 | 12.7°C | 9.7°C | 6.6°C | 21.3°C | 2.6°C | 65 mm | 84% | 3.6 m/s | 5.1 |
| 2011 | 12.4°C | 9.9°C | 7.4°C | 15.5°C | 4.8°C | 112 mm | 84% | 6.1 m/s | 4.8 |
| 2010 | 12.2°C | 9.4°C | 6.5°C | 20.5°C | 2.7°C | 51 mm | 83% | 3.6 m/s | 5.4 |
| 2009 | 12.9°C | 9.9°C | 6.8°C | 19.1°C | 3.7°C | 99 mm | 86% | 4.7 m/s | 4.8 |
| 2008 | 14.8°C | 11.5°C | 8.2°C | 19.1°C | 4.8°C | 35 mm | 84% | 3.6 m/s | 5.4 |
| 2007 | 12.8°C | 9.9°C | 7.0°C | 17.8°C | 4.5°C | 74 mm | 83% | 4.2 m/s | 5.5 |
| 2006 | 12.5°C | 9.7°C | 6.8°C | 19.1°C | 3.7°C | 122 mm | 85% | 4.7 m/s | 5 |
| 2005 | 11.9°C | 9.1°C | 6.3°C | 15.3°C | 2.7°C | 100 mm | 84% | 4.2 m/s | 5 |
| 2004 | 13.3°C | 10.3°C | 7.4°C | 17.2°C | 4.6°C | 58 mm | 85% | 3.5 m/s | 5 |
| 2003 | 12.1°C | 9.7°C | 7.3°C | 20.1°C | 3.2°C | 118 mm | 86% | 4.7 m/s | 4.2 |
| 2002 | 12.9°C | 10.2°C | 7.5°C | 17.9°C | 3.9°C | 120 mm | 86% | 4.2 m/s | 4.6 |
| 2001 | 14.4°C | 11.1°C | 7.8°C | 19.3°C | 4.5°C | 66 mm | 85% | 3.2 m/s | 5 |
| 2000 | 13.4°C | 10.1°C | 6.9°C | 18.7°C | 4.5°C | 57 mm | 84% | 3.6 m/s | 5.6 |
| 1999 | 13.4°C | 10.5°C | 7.7°C | 16.6°C | 4.7°C | 65 mm | 86% | 4.1 m/s | 4.7 |
| 1998 | 13.6°C | 10.6°C | 7.6°C | 19.9°C | 5.0°C | 61 mm | 87% | 3.8 m/s | 4.9 |
| 1997 | 13.4°C | 10.3°C | 7.2°C | 20.2°C | 2.3°C | 98 mm | 84% | 3.8 m/s | 5.1 |
| 1996 ❄️ | 10.6°C | 7.8°C | 5.0°C | 16.4°C | 1.4°C | 94 mm | 83% | 3.9 m/s | 5.2 |
| 1995 | 11.9°C | 9.2°C | 6.5°C | 18.5°C | 2.4°C | 69 mm | 85% | 4.3 m/s | 4.9 |
| 1994 | 11.9°C | 8.8°C | 5.8°C | 17.2°C | 3.4°C | 41 mm | 83% | 4.4 m/s | 5 |
| 1993 | 12.5°C | 9.4°C | 6.3°C | 16.4°C | 2.0°C | 95 mm | 85% | 4 m/s | 4.6 |
| 1992 | 14.0°C | 10.7°C | 7.4°C | 19.5°C | 2.5°C | 49 mm | 85% | 4.9 m/s | 4.7 |
| 1991 | 12.9°C | 9.8°C | 6.8°C | 16.6°C | 3.3°C | 22 mm | 86% | 3.8 m/s | 4.4 |
| 1990 | 14.5°C | 11.3°C | 8.1°C | 21.0°C | 5.5°C | 53 mm | 83% | 2.8 m/s | 5.5 |
| 1989 | 13.6°C | 10.1°C | 6.7°C | 20.4°C | 3.9°C | 37 mm | 84% | 3.9 m/s | 5.1 |
| 1988 | 13.2°C | 10.0°C | 6.8°C | 17.8°C | 3.9°C | 54 mm | 84% | 4 m/s | 4.8 |
| 1987 | 12.0°C | 9.1°C | 6.2°C | 16.0°C | 3.7°C | 52 mm | 84% | 4.5 m/s | 4.8 |
| 1986 | 11.4°C | 9.0°C | 6.5°C | 14.3°C | 3.4°C | 136 mm | 86% | 5.7 m/s | 4.1 |
| 1985 | 12.2°C | 9.2°C | 6.2°C | 16.2°C | 2.8°C | 78 mm | 84% | 3.6 m/s | 4.6 |
| 1984 | 12.6°C | 9.3°C | 5.9°C | 17.2°C | 3.0°C | 31 mm | 80% | 3.2 m/s | 5.4 |
| 1983 | 11.4°C | 8.7°C | 6.1°C | 15.4°C | 3.8°C | 81 mm | 85% | 4.1 m/s | — |
| 1982 | 12.6°C | 9.5°C | 6.4°C | 18.9°C | 0.8°C | 86 mm | 84% | 4.2 m/s | — |
| 1981 🌧️ | 12.7°C | 10.0°C | 7.2°C | 18.1°C | 2.4°C | 137 mm | 86% | 3.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 13°C with lows near 7°C (mean 10°C), based on 45 years of NASA POWER data.
May averages 78 mm of rainfall in Coleraine, one of the drier months. The wettest on record was 137 mm in 1981.
The hottest May reached 21.3°C in 2012. The coldest dipped to 0.8°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.8°C. Daytime highs moved from 12.3°C to 14.1°C and overnight lows from 6.4°C to 8°C over the same span.
May is one of the warmer months of the year in Coleraine and one of the drier months, so plan for around 13°C daytime highs and 7°C at night.
Not quite — May is the 8th coolest month in Coleraine, averaging 10°C.
For May in Coleraine, pack warm layers and a jacket for chilly mornings, with typical highs of 13°C and lows of 7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 85% — quite humid.
Average wind speed in May is 4 m/s. The windiest May on record averaged 6.1 m/s (2011).
The wettest May on record was 1981 with 137 mm. On average, May sees 78 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 Coleraine 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.
