May is one of the warmer months of the year in Bonney Lake, with average highs near 13.3°C and lows around 3.9°C (mean 8.6°C). It is one of the drier months, averaging 96 mm of rainfall and 82% relative humidity across the period.
May is one of the warmer months of the year in Bonney Lake. Across 45 years of records, the warmest May in Bonney Lake was 2023 — when the month averaged 11.7°C — while the coldest was 1999 at 5.9°C. Typical May days reach 13.3°C with nights near 3.9°C. The long-term trend is warming, about 0.2°C per decade.
May is one of the drier months in Bonney Lake, averaging 96 mm of rainfall. The wettest May on record was 1984 with 178 mm, while the driest was 1992 at 33 mm.
Relative humidity in Bonney Lake during May averages 82%. The most humid May was 1998 at 88%, and the least humid was 1992 at 74%.
May receives about 5.1 kWh/m²/day of solar energy in Bonney Lake. The sunniest May was 2023 at 6 kWh/m²/day, and the cloudiest were 1988 and 1991 at 4.3.
Average wind speed in Bonney Lake during May is 0.2 m/s. The windiest Mays were 2021, 2022 and 2023, among others at 0.2 m/s, while the calmest were 2005, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.0°C | 8.7°C | 8.5°C | 9.1°C | 8.6°C | +0.6°C |
| Avg High | 12.8°C | 13.3°C | 13.3°C | 13.8°C | 13.3°C | +0.5°C |
| Avg Low | 3.3°C | 4.0°C | 3.7°C | 4.4°C | 3.7°C | +0.4°C |
| Avg Rain | 102 mm | 95 mm | 92 mm | 92 mm | 100 mm | -1 mm |
May temperatures in Bonney Lake have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -3.5°C (1999) to a record high of 28.5°C (1983).
Rainfall in May is one of the drier months, averaging 96 mm, with a wettest year of 178 mm.
A good time to visit Bonney Lake
May is a good time to visit Bonney Lake, with days averaging 13.3°C and nights around 3.9°C (mean 8.6°C, warmer than Bonney Lake'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 | 13.3°C | 7.9°C | 2.4°C | 23.3°C | -2.6°C | 68 mm | 83% | 0.1 m/s | 5.8 |
| 2024 | 12.1°C | 7.5°C | 2.8°C | 23.2°C | -2.1°C | 101 mm | 84% | 0.1 m/s | 5.4 |
| 2023 🔥 | 16.7°C | 11.7°C | 6.6°C | 24.5°C | 2.6°C | 50 mm | 81% | 0.2 m/s | 6 |
| 2022 | 10.6°C | 6.5°C | 2.5°C | 17.9°C | -1.3°C | 169 mm | 86% | 0.2 m/s | 4.5 |
| 2021 | 13.1°C | 8.4°C | 3.6°C | 21.5°C | -0.1°C | 72 mm | 81% | 0.2 m/s | 5.6 |
| 2020 | 14.2°C | 9.3°C | 4.4°C | 25.4°C | -2.3°C | 142 mm | 82% | 0.2 m/s | 5.2 |
| 2019 | 15.5°C | 10.4°C | 5.3°C | 24.0°C | 0.4°C | 55 mm | 80% | 0.2 m/s | 5.5 |
| 2018 | 16.3°C | 11.5°C | 6.7°C | 25.0°C | 2.1°C | 37 mm | 82% | 0.2 m/s | 5.8 |
| 2017 | 14.9°C | 9.8°C | 4.6°C | 24.8°C | 0.0°C | 93 mm | 80% | 0.2 m/s | 5.5 |
| 2016 | 14.5°C | 9.9°C | 5.3°C | 21.9°C | 2.0°C | 71 mm | 81% | 0.2 m/s | 5.4 |
| 2015 | 15.0°C | 10.4°C | 5.9°C | 22.1°C | 1.2°C | 48 mm | 82% | 0.2 m/s | 5.4 |
| 2014 | 14.4°C | 9.9°C | 5.3°C | 24.4°C | 1.2°C | 102 mm | 82% | 0.2 m/s | 5.2 |
| 2013 | 14.3°C | 9.4°C | 4.5°C | 23.0°C | -2.2°C | 105 mm | 81% | 0.2 m/s | 5.1 |
| 2012 | 12.6°C | 7.7°C | 2.8°C | 23.8°C | -1.5°C | 108 mm | 79% | 0.2 m/s | 5.4 |
| 2011 | 10.5°C | 6.0°C | 1.6°C | 17.4°C | -2.1°C | 140 mm | 84% | 0.2 m/s | 4.7 |
| 2010 | 10.1°C | 6.1°C | 2.0°C | 17.7°C | -2.1°C | 160 mm | 86% | 0.2 m/s | 4.8 |
| 2009 | 13.7°C | 8.6°C | 3.5°C | 23.2°C | -1.1°C | 125 mm | 79% | 0.2 m/s | 5.7 |
| 2008 | 13.2°C | 8.5°C | 3.8°C | 25.3°C | -2.3°C | 82 mm | 84% | 0.2 m/s | 4.6 |
| 2007 | 14.0°C | 8.6°C | 3.2°C | 23.2°C | -1.3°C | 48 mm | 80% | 0.2 m/s | 5.8 |
| 2006 | 14.5°C | 9.2°C | 3.9°C | 25.2°C | -2.7°C | 90 mm | 79% | 0.2 m/s | 5.5 |
| 2005 | 14.8°C | 10.0°C | 5.3°C | 28.5°C | 2.3°C | 131 mm | 82% | 0.1 m/s | 4.9 |
| 2004 | 13.0°C | 9.0°C | 4.9°C | 18.5°C | 2.2°C | 118 mm | 85% | 0.2 m/s | 4.6 |
| 2003 | 12.2°C | 7.8°C | 3.4°C | 21.7°C | -1.3°C | 63 mm | 83% | 0.2 m/s | 5.1 |
| 2002 | 11.6°C | 7.1°C | 2.7°C | 19.4°C | -3.5°C | 79 mm | 82% | 0.2 m/s | 4.9 |
| 2001 | 14.3°C | 8.9°C | 3.5°C | 27.2°C | -2.2°C | 67 mm | 77% | 0.2 m/s | 5.8 |
| 2000 | 11.6°C | 7.4°C | 3.1°C | 17.8°C | -1.7°C | 113 mm | 84% | 0.2 m/s | 4.9 |
| 1999 ❄️ | 10.5°C | 5.9°C | 1.3°C | 23.2°C | -3.5°C | 109 mm | 82% | 0.2 m/s | 5.3 |
| 1998 | 11.7°C | 7.9°C | 4.0°C | 24.0°C | -0.8°C | 109 mm | 88% | 0.1 m/s | 4.7 |
| 1997 | 15.2°C | 10.3°C | 5.4°C | 25.0°C | -2.0°C | 83 mm | 82% | 0.2 m/s | 5.3 |
| 1996 | 10.3°C | 6.2°C | 2.2°C | 17.5°C | -1.9°C | 145 mm | 85% | 0.1 m/s | 4.6 |
| 1995 | 14.9°C | 10.1°C | 5.2°C | 22.5°C | -0.2°C | 61 mm | 79% | 0.2 m/s | 5.6 |
| 1994 | 14.2°C | 9.4°C | 4.6°C | 21.5°C | -0.7°C | 80 mm | 82% | 0.2 m/s | 4.8 |
| 1993 | 15.9°C | 10.8°C | 5.7°C | 26.0°C | -1.3°C | 116 mm | 82% | 0.2 m/s | 4.4 |
| 1992 | 16.9°C | 11.0°C | 5.1°C | 26.8°C | -0.5°C | 33 mm | 74% | 0.2 m/s | 5.8 |
| 1991 | 11.3°C | 7.2°C | 3.2°C | 15.2°C | -0.3°C | 100 mm | 85% | 0.1 m/s | 4.3 |
| 1990 | 12.2°C | 7.7°C | 3.3°C | 22.4°C | 0.2°C | 112 mm | 84% | 0.1 m/s | 4.6 |
| 1989 | 12.6°C | 8.1°C | 3.6°C | 21.9°C | 0.1°C | 89 mm | 84% | 0.2 m/s | 4.6 |
| 1988 | 12.5°C | 7.6°C | 2.6°C | 23.8°C | -1.8°C | 136 mm | 83% | 0.2 m/s | 4.3 |
| 1987 | 14.3°C | 9.2°C | 4.2°C | 26.4°C | 0.4°C | 100 mm | 80% | 0.2 m/s | 5.3 |
| 1986 | 12.7°C | 8.3°C | 3.8°C | 27.5°C | -1.1°C | 116 mm | 83% | 0.2 m/s | 4.4 |
| 1985 | 13.3°C | 8.5°C | 3.6°C | 22.2°C | -2.3°C | 66 mm | 81% | 0.2 m/s | 5 |
| 1984 🌧️ | 10.4°C | 6.2°C | 1.9°C | 24.6°C | -1.3°C | 178 mm | 85% | 0.2 m/s | 4.9 |
| 1983 | 14.8°C | 9.7°C | 4.6°C | 28.5°C | 0.0°C | 86 mm | 79% | 0.2 m/s | — |
| 1982 | 12.5°C | 7.5°C | 2.6°C | 21.4°C | -1.7°C | 52 mm | 81% | 0.2 m/s | — |
| 1981 | 11.7°C | 7.3°C | 2.9°C | 21.0°C | -1.0°C | 92 mm | 84% | 0.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 13.3°C with lows near 3.9°C (mean 8.6°C), based on 45 years of NASA POWER data.
May averages 96 mm of rainfall in Bonney Lake, one of the drier months. The wettest on record was 178 mm in 1984.
The hottest May reached 28.5°C in 1983. The coldest dipped to -3.5°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 12.5°C to 13.2°C and overnight lows from 3.1°C to 3.6°C over the same span.
May is one of the warmer months of the year in Bonney Lake and one of the drier months, so plan for around 13.3°C daytime highs and 3.9°C at night.
Not quite — May is the 8th coolest month in Bonney Lake, averaging 8.6°C.
For May in Bonney Lake, pack warm layers and a jacket for chilly mornings, with typical highs of 13.3°C and lows of 3.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 82% — quite humid.
Average wind speed in May is 0.2 m/s. The windiest May on record averaged 0.2 m/s (1982).
The wettest May on record was 1984 with 178 mm. On average, May sees 96 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 Bonney Lake 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.
