May is one of the warmer months of the year in Bothell, with average highs near 16.7°C and lows around 8°C (mean 12.4°C). It is one of the drier months, averaging 72 mm of rainfall and 79% relative humidity across the period.
May is one of the warmer months of the year in Bothell. Across 45 years of records, the warmest May in Bothell was 2023 — when the month averaged 15°C — while the coldest was 1999 at 10°C. Typical May days reach 16.7°C with nights near 8°C. The long-term May temperature trend is broadly flat.
May is one of the drier months in Bothell, averaging 72 mm of rainfall. The wettest May on record was 1984 with 138 mm, while the driest was 2018 at 17 mm.
Relative humidity in Bothell during May averages 79%. The most humid May was 1998 at 83%, and the least humid was 1992 at 73%.
May receives about 5.1 kWh/m²/day of solar energy in Bothell. The sunniest May was 2023 at 6 kWh/m²/day, and the cloudiest were 1988 and 1991 at 4.3.
Average wind speed in Bothell during May is 0.5 m/s. The windiest Mays were 1999, 2010 and 2022, among others at 0.6 m/s, while the calmest were 2019, 2023 and 2025, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.9°C | 12.6°C | 12.1°C | 12.8°C | 12.2°C | +0.3°C |
| Avg High | 16.4°C | 16.9°C | 16.5°C | 17.2°C | 16.5°C | +0.1°C |
| Avg Low | 7.5°C | 8.2°C | 7.7°C | 8.5°C | 7.9°C | +0.4°C |
| Avg Rain | 79 mm | 70 mm | 69 mm | 65 mm | 81 mm | +2 mm |
May temperatures in Bothell have stayed relatively stable across the record.
May has ranged from a record low of 0.9°C (2002) to a record high of 33.2°C (1983).
Rainfall in May is one of the drier months, averaging 72 mm, with a wettest year of 138 mm.
A good time to visit Bothell
May is a good time to visit Bothell, with days averaging 16.7°C and nights around 8°C (mean 12.4°C, warmer than Bothell's yearly average) and moderate 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 | 15.1°C | 10.9°C | 6.6°C | 24.0°C | 5.1°C | 65 mm | 83% | 0.4 m/s | 5.8 |
| 2024 | 15.5°C | 11.2°C | 7.0°C | 24.3°C | 3.7°C | 87 mm | 82% | 0.5 m/s | 5.4 |
| 2023 🔥 | 19.5°C | 15.0°C | 10.4°C | 30.1°C | 6.8°C | 49 mm | 79% | 0.4 m/s | 6 |
| 2022 | 14.4°C | 10.6°C | 6.8°C | 20.2°C | 3.1°C | 117 mm | 83% | 0.6 m/s | 4.5 |
| 2021 | 16.5°C | 12.1°C | 7.6°C | 21.9°C | 4.5°C | 49 mm | 79% | 0.5 m/s | 5.6 |
| 2020 | 17.7°C | 13.2°C | 8.7°C | 28.0°C | 5.0°C | 118 mm | 79% | 0.5 m/s | 5.2 |
| 2019 | 19.1°C | 14.4°C | 9.7°C | 26.6°C | 5.2°C | 39 mm | 77% | 0.4 m/s | 5.5 |
| 2018 | 18.8°C | 14.3°C | 9.8°C | 26.3°C | 7.0°C | 17 mm | 80% | 0.4 m/s | 5.8 |
| 2017 | 17.5°C | 12.9°C | 8.3°C | 26.0°C | 4.5°C | 72 mm | 80% | 0.5 m/s | 5.5 |
| 2016 | 18.2°C | 13.8°C | 9.4°C | 28.2°C | 6.6°C | 40 mm | 78% | 0.5 m/s | 5.4 |
| 2015 | 18.5°C | 14.1°C | 9.8°C | 25.0°C | 5.5°C | 23 mm | 79% | 0.4 m/s | 5.4 |
| 2014 | 18.2°C | 13.8°C | 9.4°C | 29.2°C | 6.4°C | 88 mm | 80% | 0.4 m/s | 5.2 |
| 2013 | 17.4°C | 13.0°C | 8.6°C | 29.0°C | 3.8°C | 74 mm | 80% | 0.4 m/s | 5.1 |
| 2012 | 15.7°C | 11.2°C | 6.7°C | 22.4°C | 2.5°C | 77 mm | 77% | 0.5 m/s | 5.4 |
| 2011 | 13.9°C | 10.1°C | 6.4°C | 18.2°C | 3.4°C | 110 mm | 83% | 0.5 m/s | 4.7 |
| 2010 | 14.6°C | 10.6°C | 6.6°C | 20.7°C | 2.5°C | 114 mm | 81% | 0.6 m/s | 4.8 |
| 2009 | 16.6°C | 11.8°C | 7.1°C | 24.6°C | 3.8°C | 92 mm | 78% | 0.5 m/s | 5.7 |
| 2008 | 16.6°C | 12.2°C | 7.9°C | 28.6°C | 3.7°C | 52 mm | 80% | 0.4 m/s | 4.6 |
| 2007 | 17.0°C | 12.1°C | 7.3°C | 27.2°C | 4.5°C | 38 mm | 77% | 0.5 m/s | 5.8 |
| 2006 | 17.1°C | 12.5°C | 7.8°C | 25.2°C | 3.2°C | 65 mm | 78% | 0.5 m/s | 5.5 |
| 2005 | 18.3°C | 14.0°C | 9.6°C | 32.3°C | 6.4°C | 95 mm | 80% | 0.5 m/s | 4.9 |
| 2004 | 17.0°C | 13.0°C | 9.0°C | 22.3°C | 6.8°C | 88 mm | 80% | 0.4 m/s | 4.6 |
| 2003 | 16.0°C | 11.7°C | 7.5°C | 24.5°C | 2.7°C | 46 mm | 79% | 0.5 m/s | 5.1 |
| 2002 | 15.0°C | 10.8°C | 6.5°C | 22.3°C | 0.9°C | 61 mm | 80% | 0.5 m/s | 4.9 |
| 2001 | 16.6°C | 11.9°C | 7.2°C | 27.4°C | 3.7°C | 59 mm | 75% | 0.5 m/s | 5.8 |
| 2000 | 15.2°C | 11.2°C | 7.2°C | 21.6°C | 3.5°C | 90 mm | 81% | 0.5 m/s | 4.9 |
| 1999 ❄️ | 14.1°C | 10.0°C | 5.9°C | 25.6°C | 1.8°C | 77 mm | 80% | 0.6 m/s | 5.3 |
| 1998 | 16.1°C | 12.3°C | 8.6°C | 27.9°C | 4.8°C | 78 mm | 83% | 0.4 m/s | 4.7 |
| 1997 | 18.6°C | 14.1°C | 9.5°C | 27.6°C | 3.1°C | 84 mm | 79% | 0.5 m/s | 5.3 |
| 1996 | 14.4°C | 10.5°C | 6.5°C | 19.7°C | 2.3°C | 114 mm | 80% | 0.5 m/s | 4.6 |
| 1995 | 18.5°C | 13.8°C | 9.1°C | 24.5°C | 5.7°C | 39 mm | 76% | 0.5 m/s | 5.6 |
| 1994 | 17.5°C | 12.9°C | 8.4°C | 22.5°C | 4.6°C | 48 mm | 77% | 0.5 m/s | 4.8 |
| 1993 | 19.1°C | 14.3°C | 9.6°C | 27.6°C | 5.0°C | 106 mm | 80% | 0.5 m/s | 4.4 |
| 1992 | 19.6°C | 14.3°C | 9.0°C | 28.7°C | 4.5°C | 23 mm | 73% | 0.5 m/s | 5.8 |
| 1991 | 15.4°C | 11.3°C | 7.3°C | 19.3°C | 3.6°C | 57 mm | 81% | 0.5 m/s | 4.3 |
| 1990 | 16.1°C | 12.0°C | 7.8°C | 22.2°C | 4.2°C | 75 mm | 79% | 0.5 m/s | 4.6 |
| 1989 | 16.5°C | 12.2°C | 7.9°C | 23.1°C | 4.2°C | 73 mm | 78% | 0.5 m/s | 4.6 |
| 1988 | 16.2°C | 11.7°C | 7.2°C | 27.0°C | 2.6°C | 107 mm | 79% | 0.5 m/s | 4.3 |
| 1987 | 17.5°C | 12.8°C | 8.1°C | 25.9°C | 3.3°C | 77 mm | 77% | 0.6 m/s | 5.3 |
| 1986 | 15.8°C | 11.6°C | 7.3°C | 26.6°C | 3.1°C | 100 mm | 81% | 0.6 m/s | 4.4 |
| 1985 | 16.6°C | 12.0°C | 7.4°C | 26.7°C | 2.6°C | 56 mm | 78% | 0.5 m/s | 5 |
| 1984 🌧️ | 14.1°C | 10.2°C | 6.2°C | 26.1°C | 3.4°C | 138 mm | 81% | 0.6 m/s | 4.9 |
| 1983 | 18.3°C | 13.6°C | 9.0°C | 33.2°C | 4.1°C | 61 mm | 77% | 0.5 m/s | — |
| 1982 | 16.2°C | 11.6°C | 7.0°C | 24.1°C | 3.1°C | 25 mm | 76% | 0.5 m/s | — |
| 1981 | 16.0°C | 11.7°C | 7.5°C | 27.4°C | 4.2°C | 69 mm | 80% | 0.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16.7°C with lows near 8°C (mean 12.4°C), based on 45 years of NASA POWER data.
May averages 72 mm of rainfall in Bothell, one of the drier months. The wettest on record was 138 mm in 1984.
The hottest May reached 33.2°C in 1983. The coldest dipped to 0.9°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. Daytime highs moved from 16.2°C to 16.2°C and overnight lows from 7.4°C to 7.7°C over the same span.
May is one of the warmer months of the year in Bothell and one of the drier months, so plan for around 16.7°C daytime highs and 8°C at night.
Not quite — May is the 8th coolest month in Bothell, averaging 12.4°C.
For May in Bothell, pack light layers you can adjust through the day, with typical highs of 16.7°C and lows of 8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 79% — quite humid.
Average wind speed in May is 0.5 m/s. The windiest May on record averaged 0.6 m/s (1984).
The wettest May on record was 1984 with 138 mm. On average, May sees 72 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 Bothell 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.
