May is one of the warmer months of the year in Prince Rupert, with average highs near 11.4°C and lows around 6.9°C (mean 9.2°C). It is one of the drier months, averaging 116 mm of rainfall and 81% relative humidity across the period.
May is one of the warmer months of the year in Prince Rupert. Across 45 years of records, the warmest May in Prince Rupert was 1993 — when the month averaged 11.5°C — while the coldest were 1999 and 2001 at 6.9°C. Typical May days reach 11.4°C with nights near 6.9°C. The long-term trend is warming, about 0.2°C per decade.
May is one of the drier months in Prince Rupert, averaging 116 mm of rainfall. The wettest May on record was 2001 with 310 mm, while the driest was 2015 at 20 mm.
Relative humidity in Prince Rupert during May averages 81%. The most humid May was 2025 at 84%, and the least humid was 1996 at 76%.
May receives about 4.8 kWh/m²/day of solar energy in Prince Rupert. The sunniest May was 1996 at 5.7 kWh/m²/day, and the cloudiest were 2001 and 2025 at 4.1.
Average wind speed in Prince Rupert during May is 2.9 m/s. The windiest May was 2025 at 4.5 m/s, while the calmest was 2015 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.7°C | 9.5°C | 8.9°C | 9.7°C | 9.1°C | +0.4°C |
| Avg High | 11.0°C | 11.9°C | 11.1°C | 11.9°C | 11.2°C | +0.2°C |
| Avg Low | 6.4°C | 7.1°C | 6.7°C | 7.5°C | 7.1°C | +0.7°C |
| Avg Rain | 129 mm | 97 mm | 125 mm | 111 mm | 124 mm | -5 mm |
May temperatures in Prince Rupert have stayed relatively stable across the record.
May has ranged from a record low of -0.2°C (2002) to a record high of 26.7°C (1983).
Rainfall in May is one of the drier months, averaging 116 mm, with a wettest year of 310 mm.
A good time to visit Prince Rupert
May is a good time to visit Prince Rupert, with days averaging 11.4°C and nights around 6.9°C (mean 9.2°C, warmer than Prince Rupert's yearly average) and higher 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 | 10.3°C | 8.7°C | 7.0°C | 13.2°C | 5.4°C | 257 mm | 84% | 4.5 m/s | 4.1 |
| 2024 | 10.5°C | 8.6°C | 6.7°C | 16.9°C | 4.4°C | 131 mm | 83% | 3.2 m/s | 4.6 |
| 2023 | 13.0°C | 10.6°C | 8.1°C | 20.1°C | 5.3°C | 66 mm | 82% | 2.6 m/s | 5.4 |
| 2022 | 10.3°C | 8.2°C | 6.1°C | 17.1°C | 3.9°C | 115 mm | 82% | 2.9 m/s | 4.8 |
| 2021 | 10.4°C | 8.6°C | 6.8°C | 13.5°C | 4.9°C | 109 mm | 84% | 2.9 m/s | 4.4 |
| 2020 | 12.6°C | 10.2°C | 7.8°C | 17.9°C | 4.5°C | 68 mm | 79% | 2.8 m/s | 5.2 |
| 2019 | 12.9°C | 10.5°C | 8.1°C | 19.9°C | 5.6°C | 47 mm | 83% | 2.3 m/s | 5.1 |
| 2018 | 12.2°C | 9.8°C | 7.5°C | 18.2°C | 4.8°C | 120 mm | 83% | 2.7 m/s | 4.6 |
| 2017 | 11.5°C | 9.3°C | 7.0°C | 18.0°C | 4.1°C | 165 mm | 82% | 2.9 m/s | 4.7 |
| 2016 | 12.7°C | 10.5°C | 8.4°C | 21.0°C | 5.4°C | 124 mm | 80% | 3.1 m/s | 5.1 |
| 2015 | 13.6°C | 11.2°C | 8.8°C | 18.3°C | 5.0°C | 20 mm | 81% | 1.8 m/s | 5.4 |
| 2014 | 12.3°C | 10.2°C | 8.1°C | 16.9°C | 5.2°C | 117 mm | 83% | 2.7 m/s | 4.6 |
| 2013 | 12.0°C | 9.7°C | 7.5°C | 15.6°C | 3.8°C | 136 mm | 82% | 2.8 m/s | 4.6 |
| 2012 | 9.1°C | 7.3°C | 5.6°C | 15.0°C | 2.7°C | 179 mm | 83% | 4.1 m/s | 4.4 |
| 2011 | 10.7°C | 8.5°C | 6.4°C | 19.4°C | 3.8°C | 132 mm | 82% | 2.9 m/s | 4.5 |
| 2010 | 11.8°C | 9.5°C | 7.1°C | 18.7°C | 2.7°C | 70 mm | 79% | 2.4 m/s | 5.1 |
| 2009 | 10.8°C | 8.5°C | 6.2°C | 16.5°C | 4.8°C | 114 mm | 79% | 2.6 m/s | 5 |
| 2008 | 11.1°C | 8.9°C | 6.7°C | 20.3°C | 2.8°C | 143 mm | 81% | 3 m/s | 4.4 |
| 2007 | 10.7°C | 8.5°C | 6.4°C | 16.0°C | 4.0°C | 64 mm | 79% | 2.7 m/s | 4.9 |
| 2006 | 11.1°C | 8.9°C | 6.8°C | 16.9°C | 2.5°C | 99 mm | 81% | 2.7 m/s | 4.8 |
| 2005 | 13.7°C | 11.2°C | 8.6°C | 20.0°C | 5.3°C | 102 mm | 79% | 2.6 m/s | 5.5 |
| 2004 | 13.1°C | 10.6°C | 8.2°C | 19.2°C | 6.0°C | 73 mm | 79% | 2.6 m/s | 5.5 |
| 2003 | 11.1°C | 8.9°C | 6.7°C | 16.3°C | 2.6°C | 110 mm | 77% | 3.1 m/s | 5.1 |
| 2002 | 10.3°C | 8.1°C | 5.8°C | 16.3°C | -0.2°C | 134 mm | 82% | 3.2 m/s | 4.2 |
| 2001 🌧️ | 8.6°C | 6.9°C | 5.2°C | 12.8°C | 3.0°C | 310 mm | 84% | 4.3 m/s | 4.1 |
| 2000 | 10.2°C | 8.1°C | 6.0°C | 16.1°C | 4.5°C | 105 mm | 79% | 2.9 m/s | 5.1 |
| 1999 ❄️ | 8.8°C | 6.9°C | 5.0°C | 13.2°C | 1.9°C | 198 mm | 84% | 3.8 m/s | 4.3 |
| 1998 | 12.6°C | 10.3°C | 8.0°C | 22.2°C | 5.6°C | 57 mm | 81% | 2.5 m/s | 5.4 |
| 1997 | 13.3°C | 10.4°C | 7.4°C | 17.5°C | 3.4°C | 72 mm | 79% | 2.6 m/s | 5.1 |
| 1996 | 11.0°C | 8.5°C | 6.0°C | 15.7°C | 2.0°C | 57 mm | 76% | 2.7 m/s | 5.7 |
| 1995 | 13.0°C | 10.4°C | 7.9°C | 18.5°C | 5.3°C | 53 mm | 80% | 2.2 m/s | 5.1 |
| 1994 | 11.8°C | 9.4°C | 6.9°C | 18.1°C | 4.8°C | 127 mm | 79% | 3.4 m/s | 4.3 |
| 1993 🔥 | 14.3°C | 11.5°C | 8.6°C | 23.3°C | 4.5°C | 81 mm | 80% | 2.4 m/s | 4.6 |
| 1992 | 11.0°C | 8.9°C | 6.8°C | 17.3°C | 3.8°C | 159 mm | 79% | 3.5 m/s | 4.7 |
| 1991 | 11.3°C | 8.8°C | 6.4°C | 16.9°C | 4.2°C | 90 mm | 81% | 3 m/s | 4.7 |
| 1990 | 12.3°C | 9.9°C | 7.5°C | 18.0°C | 4.5°C | 74 mm | 83% | 2.4 m/s | 4.8 |
| 1989 | 11.9°C | 9.5°C | 7.1°C | 20.7°C | 4.1°C | 65 mm | 80% | 2.2 m/s | 5 |
| 1988 | 11.3°C | 8.9°C | 6.4°C | 17.2°C | 3.0°C | 156 mm | 79% | 3.2 m/s | 4.2 |
| 1987 | 10.3°C | 8.4°C | 6.4°C | 13.5°C | 3.9°C | 189 mm | 84% | 3.8 m/s | 4.6 |
| 1986 | 9.9°C | 7.8°C | 5.8°C | 13.4°C | 2.7°C | 144 mm | 80% | 2.8 m/s | 4.3 |
| 1985 | 10.7°C | 8.3°C | 5.8°C | 17.9°C | 2.0°C | 108 mm | 81% | 2.8 m/s | 4.6 |
| 1984 | 10.2°C | 8.1°C | 6.0°C | 13.6°C | 4.0°C | 115 mm | 80% | 3.1 m/s | 4.6 |
| 1983 | 12.2°C | 9.8°C | 7.4°C | 26.7°C | 5.2°C | 146 mm | 81% | 2.8 m/s | — |
| 1982 | 9.6°C | 7.2°C | 4.9°C | 18.0°C | 2.1°C | 150 mm | 81% | 3.5 m/s | — |
| 1981 | 12.5°C | 10.0°C | 7.6°C | 16.7°C | 4.9°C | 88 mm | 79% | 2.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 11.4°C with lows near 6.9°C (mean 9.2°C), based on 45 years of NASA POWER data.
May averages 116 mm of rainfall in Prince Rupert, one of the drier months. The wettest on record was 310 mm in 2001.
The hottest May reached 26.7°C in 1983. The coldest dipped to -0.2°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.2°C — but days and nights have moved in opposite directions. Overnight lows rose from 6.3°C to 6.9°C while daytime highs eased from 11°C to 10.9°C, narrowing the gap between day and night.
May is one of the warmer months of the year in Prince Rupert and one of the drier months, so plan for around 11.4°C daytime highs and 6.9°C at night.
Not quite — May is the 8th coolest month in Prince Rupert, averaging 9.2°C.
For May in Prince Rupert, pack warm layers and a jacket for chilly mornings, with typical highs of 11.4°C and lows of 6.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 81% — quite humid.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 4.5 m/s (2025).
The wettest May on record was 2001 with 310 mm. On average, May sees 116 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 Prince Rupert 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.
