May is one of the warmer months of the year in Bangor, with average highs near 13°C and lows around 9°C (mean 11°C). It is one of the drier months, averaging 69 mm of rainfall and 83% relative humidity across the period.
May is one of the warmer months of the year in Bangor. Across 45 years of records, the warmest May in Bangor was 2024 — when the month averaged 12.9°C — while the coldest was 1996 at 8.8°C. Typical May days reach 13°C with nights near 9°C. The long-term trend is warming, about 0.4°C per decade.
May is one of the drier months in Bangor, averaging 69 mm of rainfall. The wettest May on record was 2021 with 177 mm, while the driest was 2020 at 16 mm.
Relative humidity in Bangor during May averages 83%. The most humid May was 1986 at 86%, and the least humid was 2020 at 79%.
May receives about 5.2 kWh/m²/day of solar energy in Bangor. The sunniest Mays were 2020 and 2025 at 6.2 kWh/m²/day, and the cloudiest were 1985, 1993 and 2014 at 4.5.
Average wind speed in Bangor during May is 4.3 m/s. The windiest Mays were 1986 and 2011 at 6.3 m/s, while the calmest were 1990 and 2004 at 3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.2°C | 10.9°C | 11.2°C | 11.0°C | 12.0°C | +1.8°C |
| Avg High | 12.2°C | 13.0°C | 13.2°C | 12.9°C | 14.0°C | +1.8°C |
| Avg Low | 8.3°C | 8.7°C | 9.3°C | 9.0°C | 9.9°C | +1.6°C |
| Avg Rain | 58 mm | 61 mm | 87 mm | 70 mm | 70 mm | +12 mm |
May temperatures in Bangor have risen by about 2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 3.5°C (1996) to a record high of 22.2°C (1990).
Rainfall in May is one of the drier months, averaging 69 mm, with a wettest year of 177 mm.
A good time to visit Bangor
May is a good time to visit Bangor, with days averaging 13°C and nights around 9°C (mean 11°C, close to Bangor'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 | 15.1°C | 12.8°C | 10.5°C | 19.6°C | 6.7°C | 55 mm | 80% | 3.9 m/s | 6.2 |
| 2024 🔥 | 14.9°C | 12.9°C | 10.8°C | 19.8°C | 8.0°C | 78 mm | 85% | 3.3 m/s | 4.7 |
| 2023 | 14.3°C | 12.3°C | 10.2°C | 17.0°C | 8.2°C | 30 mm | 84% | 3.3 m/s | 5.9 |
| 2022 | 13.7°C | 12.0°C | 10.3°C | 17.2°C | 9.0°C | 65 mm | 86% | 4.3 m/s | 4.9 |
| 2021 🌧️ | 11.7°C | 10.1°C | 8.5°C | 18.9°C | 4.4°C | 177 mm | 82% | 4.4 m/s | 5.5 |
| 2020 | 14.2°C | 11.7°C | 9.2°C | 20.6°C | 4.8°C | 16 mm | 79% | 4.2 m/s | 6.2 |
| 2019 | 12.6°C | 10.8°C | 9.1°C | 17.5°C | 5.9°C | 47 mm | 81% | 3.5 m/s | 5.1 |
| 2018 | 14.4°C | 11.9°C | 9.4°C | 20.5°C | 5.9°C | 41 mm | 83% | 3.4 m/s | 5.4 |
| 2017 | 14.3°C | 12.1°C | 9.9°C | 21.3°C | 5.7°C | 54 mm | 84% | 4 m/s | 5.6 |
| 2016 | 13.6°C | 11.5°C | 9.4°C | 17.9°C | 6.9°C | 48 mm | 83% | 3.9 m/s | 5.3 |
| 2015 | 11.4°C | 9.9°C | 8.3°C | 13.4°C | 5.4°C | 134 mm | 84% | 5.4 m/s | 4.8 |
| 2014 | 13.4°C | 11.6°C | 9.8°C | 17.5°C | 7.7°C | 107 mm | 86% | 4.2 m/s | 4.5 |
| 2013 | 11.2°C | 9.6°C | 7.9°C | 15.9°C | 5.7°C | 71 mm | 84% | 5.2 m/s | 5.2 |
| 2012 | 12.9°C | 10.7°C | 8.6°C | 20.5°C | 4.2°C | 69 mm | 83% | 3.7 m/s | 5.3 |
| 2011 | 13.0°C | 11.3°C | 9.5°C | 15.5°C | 5.8°C | 90 mm | 83% | 6.3 m/s | 4.9 |
| 2010 | 12.2°C | 10.3°C | 8.4°C | 21.9°C | 5.2°C | 41 mm | 82% | 3.4 m/s | 5.7 |
| 2009 | 12.8°C | 10.9°C | 9.0°C | 20.1°C | 5.9°C | 90 mm | 85% | 5.4 m/s | 5 |
| 2008 | 15.2°C | 12.5°C | 9.9°C | 19.4°C | 6.9°C | 51 mm | 81% | 3.7 m/s | 5.3 |
| 2007 | 13.0°C | 11.3°C | 9.5°C | 16.4°C | 7.9°C | 94 mm | 83% | 4.7 m/s | 5.3 |
| 2006 | 13.1°C | 11.2°C | 9.2°C | 18.9°C | 6.8°C | 143 mm | 85% | 4.6 m/s | 4.7 |
| 2005 | 12.3°C | 10.5°C | 8.7°C | 20.2°C | 5.6°C | 59 mm | 82% | 5 m/s | 5.4 |
| 2004 | 12.9°C | 11.0°C | 9.2°C | 16.6°C | 6.5°C | 57 mm | 85% | 3 m/s | 5.6 |
| 2003 | 12.6°C | 11.0°C | 9.4°C | 20.5°C | 7.3°C | 130 mm | 85% | 5.6 m/s | 4.7 |
| 2002 | 12.8°C | 11.1°C | 9.5°C | 18.4°C | 6.9°C | 94 mm | 83% | 5.5 m/s | 5 |
| 2001 | 14.0°C | 11.5°C | 9.1°C | 19.4°C | 5.3°C | 69 mm | 83% | 3.5 m/s | 5.6 |
| 2000 | 13.7°C | 11.4°C | 9.1°C | 19.6°C | 6.3°C | 81 mm | 82% | 4.1 m/s | 5.7 |
| 1999 | 13.5°C | 11.6°C | 9.6°C | 18.3°C | 7.4°C | 69 mm | 86% | 4.7 m/s | 4.8 |
| 1998 | 14.2°C | 11.9°C | 9.7°C | 20.3°C | 6.7°C | 40 mm | 85% | 4 m/s | 5.4 |
| 1997 | 13.5°C | 11.2°C | 8.8°C | 21.4°C | 3.9°C | 91 mm | 82% | 4 m/s | 5.2 |
| 1996 ❄️ | 10.7°C | 8.8°C | 6.9°C | 15.8°C | 3.5°C | 73 mm | 81% | 4.8 m/s | 5.3 |
| 1995 | 12.2°C | 10.4°C | 8.5°C | 18.5°C | 4.6°C | 59 mm | 82% | 4.3 m/s | 5 |
| 1994 | 12.1°C | 10.1°C | 8.0°C | 16.0°C | 5.7°C | 42 mm | 82% | 4.4 m/s | 5.2 |
| 1993 | 12.7°C | 10.6°C | 8.5°C | 17.1°C | 5.4°C | 118 mm | 83% | 4.8 m/s | 4.5 |
| 1992 | 14.2°C | 11.8°C | 9.4°C | 21.0°C | 6.0°C | 69 mm | 83% | 4.6 m/s | 5.3 |
| 1991 | 12.2°C | 10.3°C | 8.4°C | 15.9°C | 5.9°C | 18 mm | 85% | 3.6 m/s | 4.9 |
| 1990 | 14.4°C | 12.0°C | 9.6°C | 22.2°C | 7.0°C | 32 mm | 80% | 3 m/s | 5.4 |
| 1989 | 13.8°C | 11.5°C | 9.2°C | 20.4°C | 5.1°C | 24 mm | 83% | 3.9 m/s | 5.6 |
| 1988 | 13.2°C | 11.1°C | 9.0°C | 18.8°C | 6.7°C | 52 mm | 82% | 3.7 m/s | 5.2 |
| 1987 | 11.5°C | 9.7°C | 8.0°C | 16.6°C | 5.5°C | 38 mm | 83% | 4.5 m/s | 4.9 |
| 1986 | 11.2°C | 9.6°C | 8.1°C | 14.7°C | 5.9°C | 78 mm | 86% | 6.3 m/s | 4.6 |
| 1985 | 12.1°C | 10.1°C | 8.0°C | 17.3°C | 5.5°C | 70 mm | 83% | 3.8 m/s | 4.5 |
| 1984 | 12.0°C | 9.7°C | 7.4°C | 14.1°C | 4.2°C | 42 mm | 80% | 3.6 m/s | 5.7 |
| 1983 | 11.2°C | 9.5°C | 7.7°C | 15.3°C | 5.2°C | 87 mm | 85% | 4.2 m/s | — |
| 1982 | 12.3°C | 10.2°C | 8.1°C | 17.9°C | 3.6°C | 43 mm | 82% | 4.3 m/s | — |
| 1981 | 12.5°C | 10.6°C | 8.8°C | 18.2°C | 4.9°C | 92 mm | 85% | 4.5 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 9°C (mean 11°C), based on 45 years of NASA POWER data.
May averages 69 mm of rainfall in Bangor, one of the drier months. The wettest on record was 177 mm in 2021.
The hottest May reached 22.2°C in 1990. The coldest dipped to 3.5°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2°C. Daytime highs moved from 12°C to 13.9°C and overnight lows from 8°C to 10.1°C over the same span.
May is one of the warmer months of the year in Bangor and one of the drier months, so plan for around 13°C daytime highs and 9°C at night.
Not quite — May is the 7th coolest month in Bangor, averaging 11°C.
For May in Bangor, pack light layers you can adjust through the day, with typical highs of 13°C and lows of 9°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 83% — quite humid.
Average wind speed in May is 4.3 m/s. The windiest May on record averaged 6.3 m/s (1986).
The wettest May on record was 2021 with 177 mm. On average, May sees 69 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 Bangor 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.
