May is one of the warmer months of the year in Chilliwack, with average highs near 14.2°C and lows around 4.8°C (mean 9.5°C). It is one of the drier months, averaging 104 mm of rainfall and 80% relative humidity across the period.
May is one of the warmer months of the year in Chilliwack. Across 45 years of records, the warmest May in Chilliwack was 2023 — when the month averaged 13.1°C — while the coldest were 1984 and 1999 at 6.5°C. Typical May days reach 14.2°C with nights near 4.8°C. The long-term trend is warming, about 0.3°C per decade.
May is one of the drier months in Chilliwack, averaging 104 mm of rainfall. The wettest May on record was 1984 with 212 mm, while the driest was 2018 at 27 mm.
Relative humidity in Chilliwack during May averages 80%. The most humid May was 2011 at 86%, and the least humid was 1992 at 72%.
May receives about 5.4 kWh/m²/day of solar energy in Chilliwack. The sunniest May was 2009 at 6.2 kWh/m²/day, and the cloudiest were 2011 and 2022 at 4.6.
Average wind speed in Chilliwack during May is 0.2 m/s. The windiest Mays were 1995, 2006 and 2012, among others at 0.3 m/s, while the calmest was 1991 at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.9°C | 9.8°C | 9.3°C | 10.2°C | 9.5°C | +0.6°C |
| Avg High | 13.6°C | 14.5°C | 14.0°C | 14.9°C | 14.1°C | +0.5°C |
| Avg Low | 4.2°C | 5.0°C | 4.5°C | 5.4°C | 4.9°C | +0.7°C |
| Avg Rain | 124 mm | 96 mm | 103 mm | 92 mm | 109 mm | -15 mm |
May temperatures in Chilliwack have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -4.3°C (1999) to a record high of 35.4°C (1983).
Rainfall in May is one of the drier months, averaging 104 mm, with a wettest year of 212 mm.
A good time to visit Chilliwack
May is a good time to visit Chilliwack, with days averaging 14.2°C and nights around 4.8°C (mean 9.5°C, warmer than Chilliwack'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 | 13.0°C | 8.3°C | 3.6°C | 24.6°C | -0.2°C | 98 mm | 83% | 0.2 m/s | 5.7 |
| 2024 | 12.7°C | 8.5°C | 4.2°C | 23.4°C | 0.4°C | 114 mm | 84% | 0.2 m/s | 5 |
| 2023 🔥 | 18.2°C | 13.1°C | 8.0°C | 29.3°C | 3.9°C | 62 mm | 80% | 0.2 m/s | 5.8 |
| 2022 | 11.4°C | 7.4°C | 3.4°C | 17.6°C | 0.6°C | 154 mm | 85% | 0.2 m/s | 4.6 |
| 2021 | 13.9°C | 9.3°C | 4.7°C | 21.1°C | 1.0°C | 77 mm | 80% | 0.2 m/s | 5.5 |
| 2020 | 15.1°C | 10.3°C | 5.5°C | 24.5°C | -1.6°C | 152 mm | 81% | 0.2 m/s | 5.3 |
| 2019 | 17.6°C | 12.3°C | 7.0°C | 24.4°C | 2.5°C | 63 mm | 78% | 0.2 m/s | 5.5 |
| 2018 | 17.6°C | 12.4°C | 7.2°C | 25.8°C | 3.0°C | 27 mm | 79% | 0.2 m/s | 6.1 |
| 2017 | 15.3°C | 10.2°C | 5.1°C | 26.6°C | 0.6°C | 94 mm | 79% | 0.2 m/s | 5.7 |
| 2016 | 16.2°C | 11.3°C | 6.3°C | 25.6°C | 2.4°C | 71 mm | 78% | 0.2 m/s | 5.3 |
| 2015 | 17.2°C | 12.3°C | 7.4°C | 23.1°C | 0.6°C | 41 mm | 78% | 0.2 m/s | 5.7 |
| 2014 | 14.9°C | 10.5°C | 6.1°C | 24.2°C | 2.8°C | 125 mm | 81% | 0.2 m/s | 5.1 |
| 2013 | 15.2°C | 10.4°C | 5.7°C | 25.0°C | -3.5°C | 113 mm | 80% | 0.2 m/s | 5.5 |
| 2012 | 12.8°C | 8.0°C | 3.3°C | 21.4°C | -2.2°C | 92 mm | 78% | 0.3 m/s | 5.7 |
| 2011 | 10.5°C | 6.7°C | 2.9°C | 16.5°C | -1.4°C | 159 mm | 86% | 0.2 m/s | 4.6 |
| 2010 | 12.1°C | 7.7°C | 3.4°C | 20.0°C | -1.1°C | 138 mm | 82% | 0.2 m/s | 5 |
| 2009 | 14.3°C | 9.1°C | 3.9°C | 23.0°C | 0.4°C | 139 mm | 77% | 0.2 m/s | 6.2 |
| 2008 | 14.2°C | 9.3°C | 4.4°C | 26.3°C | -2.0°C | 80 mm | 82% | 0.2 m/s | 5.1 |
| 2007 | 14.6°C | 9.4°C | 4.3°C | 23.4°C | 0.1°C | 60 mm | 78% | 0.2 m/s | 6 |
| 2006 | 15.3°C | 10.1°C | 4.9°C | 28.4°C | -1.6°C | 96 mm | 76% | 0.3 m/s | 5.4 |
| 2005 | 16.5°C | 11.5°C | 6.5°C | 29.0°C | 2.7°C | 87 mm | 80% | 0.2 m/s | 5.3 |
| 2004 | 14.4°C | 10.3°C | 6.1°C | 21.5°C | 1.3°C | 120 mm | 81% | 0.2 m/s | 4.8 |
| 2003 | 13.0°C | 8.5°C | 4.1°C | 21.4°C | -0.7°C | 78 mm | 81% | 0.2 m/s | 4.9 |
| 2002 | 11.8°C | 7.4°C | 3.1°C | 20.4°C | -2.8°C | 97 mm | 82% | 0.2 m/s | 5.1 |
| 2001 | 13.8°C | 9.0°C | 4.1°C | 28.5°C | -1.6°C | 108 mm | 77% | 0.2 m/s | 5.5 |
| 2000 | 12.2°C | 8.0°C | 3.8°C | 18.6°C | -1.7°C | 161 mm | 83% | 0.2 m/s | 5.2 |
| 1999 | 10.9°C | 6.5°C | 2.1°C | 22.9°C | -4.3°C | 117 mm | 82% | 0.2 m/s | 5.5 |
| 1998 | 14.4°C | 10.0°C | 5.5°C | 27.2°C | 1.3°C | 102 mm | 83% | 0.2 m/s | 5.2 |
| 1997 | 15.7°C | 10.9°C | 6.1°C | 26.0°C | -3.0°C | 125 mm | 80% | 0.2 m/s | 5.6 |
| 1996 | 11.3°C | 7.2°C | 3.2°C | 20.3°C | -0.7°C | 149 mm | 83% | 0.2 m/s | 5.1 |
| 1995 | 16.7°C | 11.4°C | 6.1°C | 22.4°C | 1.9°C | 42 mm | 74% | 0.3 m/s | 6.1 |
| 1994 | 15.2°C | 10.3°C | 5.3°C | 23.8°C | 0.0°C | 62 mm | 78% | 0.2 m/s | 5.4 |
| 1993 | 17.7°C | 12.3°C | 7.0°C | 31.9°C | 0.9°C | 129 mm | 80% | 0.2 m/s | 5.7 |
| 1992 | 16.9°C | 11.5°C | 6.0°C | 26.4°C | -0.4°C | 43 mm | 72% | 0.3 m/s | 6 |
| 1991 | 12.9°C | 8.7°C | 4.5°C | 19.1°C | 0.8°C | 99 mm | 84% | 0.1 m/s | 5.1 |
| 1990 | 13.1°C | 8.8°C | 4.5°C | 22.7°C | 1.1°C | 96 mm | 82% | 0.2 m/s | 4.9 |
| 1989 | 13.8°C | 9.2°C | 4.6°C | 21.6°C | 1.0°C | 135 mm | 82% | 0.2 m/s | 5.3 |
| 1988 | 13.8°C | 8.7°C | 3.7°C | 25.1°C | -0.3°C | 154 mm | 80% | 0.2 m/s | 4.9 |
| 1987 | 15.2°C | 10.0°C | 4.7°C | 26.9°C | -0.3°C | 140 mm | 77% | 0.2 m/s | 5.7 |
| 1986 | 13.2°C | 8.8°C | 4.4°C | 27.2°C | -0.5°C | 154 mm | 81% | 0.2 m/s | 5.1 |
| 1985 | 14.0°C | 9.2°C | 4.5°C | 23.8°C | -1.0°C | 94 mm | 80% | 0.2 m/s | 5.4 |
| 1984 ❄️ 🌧️ | 10.3°C | 6.5°C | 2.7°C | 21.0°C | -0.2°C | 212 mm | 85% | 0.2 m/s | 5.1 |
| 1983 | 16.4°C | 11.0°C | 5.7°C | 35.4°C | 1.2°C | 60 mm | 77% | 0.2 m/s | — |
| 1982 | 12.6°C | 8.0°C | 3.4°C | 21.2°C | -1.5°C | 57 mm | 78% | 0.3 m/s | — |
| 1981 | 13.2°C | 8.8°C | 4.3°C | 21.4°C | -0.1°C | 111 mm | 82% | 0.2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 14.2°C with lows near 4.8°C (mean 9.5°C), based on 45 years of NASA POWER data.
May averages 104 mm of rainfall in Chilliwack, one of the drier months. The wettest on record was 212 mm in 1984.
The hottest May reached 35.4°C in 1983. The coldest dipped to -4.3°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.6°C. Daytime highs moved from 13.3°C to 13.8°C and overnight lows from 4.1°C to 4.8°C over the same span.
May is one of the warmer months of the year in Chilliwack and one of the drier months, so plan for around 14.2°C daytime highs and 4.8°C at night.
Not quite — May is the 8th coolest month in Chilliwack, averaging 9.5°C.
For May in Chilliwack, pack warm layers and a jacket for chilly mornings, with typical highs of 14.2°C and lows of 4.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 80% — quite humid.
Average wind speed in May is 0.2 m/s. The windiest May on record averaged 0.3 m/s (1982).
The wettest May on record was 1984 with 212 mm. On average, May sees 104 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 Chilliwack 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.
