May is one of the warmer months of the year in Snohomish, with average highs near 15.4°C and lows around 6.3°C (mean 10.9°C). It is one of the drier months, averaging 105 mm of rainfall and 81% relative humidity across the period.
May is one of the warmer months of the year in Snohomish. Across 45 years of records, the warmest May in Snohomish was 2023 — when the month averaged 13.9°C — while the coldest was 1984 at 8.3°C. Typical May days reach 15.4°C with nights near 6.3°C. The long-term trend is warming, about 0.2°C per decade.
May is one of the drier months in Snohomish, averaging 105 mm of rainfall. The wettest May on record was 1984 with 216 mm, while the driest was 2018 at 30 mm.
Relative humidity in Snohomish during May averages 81%. The most humid May was 1998 at 86%, and the least humid was 1992 at 74%.
May receives about 5.1 kWh/m²/day of solar energy in Snohomish. The sunniest May was 2023 at 6 kWh/m²/day, and the cloudiest were 1988 and 1991 at 4.3.
Average wind speed in Snohomish during May is 0.2 m/s. The windiest Mays were 2001, 2017 and 2021, among others at 0.3 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.4°C | 11.0°C | 10.7°C | 11.4°C | 10.6°C | +0.2°C |
| Avg High | 14.9°C | 15.6°C | 15.3°C | 16.0°C | 15.1°C | +0.2°C |
| Avg Low | 5.8°C | 6.5°C | 6.1°C | 6.8°C | 6.2°C | +0.4°C |
| Avg Rain | 115 mm | 100 mm | 102 mm | 93 mm | 120 mm | +5 mm |
May temperatures in Snohomish have stayed relatively stable across the record.
May has ranged from a record low of -2.2°C (1999) to a record high of 33°C (1983).
Rainfall in May is one of the drier months, averaging 105 mm, with a wettest year of 216 mm.
A good time to visit Snohomish
May is a good time to visit Snohomish, with days averaging 15.4°C and nights around 6.3°C (mean 10.9°C, warmer than Snohomish'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 | 13.8°C | 9.2°C | 4.6°C | 24.5°C | 1.1°C | 89 mm | 84% | 0.2 m/s | 5.8 |
| 2024 | 13.7°C | 9.5°C | 5.3°C | 24.1°C | 0.5°C | 127 mm | 84% | 0.2 m/s | 5.4 |
| 2023 🔥 | 18.8°C | 13.9°C | 9.1°C | 29.7°C | 3.7°C | 63 mm | 81% | 0.2 m/s | 6 |
| 2022 | 12.8°C | 9.0°C | 5.2°C | 19.2°C | 1.8°C | 186 mm | 85% | 0.2 m/s | 4.5 |
| 2021 | 15.0°C | 10.6°C | 6.1°C | 22.2°C | 2.2°C | 87 mm | 81% | 0.3 m/s | 5.6 |
| 2020 | 16.4°C | 11.7°C | 7.0°C | 27.1°C | 0.7°C | 166 mm | 81% | 0.2 m/s | 5.2 |
| 2019 | 17.9°C | 12.9°C | 8.0°C | 24.3°C | 3.4°C | 57 mm | 80% | 0.2 m/s | 5.5 |
| 2018 | 18.1°C | 13.3°C | 8.5°C | 26.9°C | 5.1°C | 30 mm | 80% | 0.2 m/s | 5.8 |
| 2017 | 16.7°C | 11.6°C | 6.5°C | 25.8°C | 0.8°C | 97 mm | 80% | 0.3 m/s | 5.5 |
| 2016 | 16.7°C | 12.3°C | 7.8°C | 26.5°C | 4.8°C | 68 mm | 81% | 0.2 m/s | 5.4 |
| 2015 | 17.3°C | 12.8°C | 8.2°C | 24.0°C | 3.3°C | 34 mm | 80% | 0.2 m/s | 5.4 |
| 2014 | 16.6°C | 12.2°C | 7.8°C | 28.0°C | 4.4°C | 127 mm | 81% | 0.2 m/s | 5.2 |
| 2013 | 16.3°C | 11.5°C | 6.8°C | 27.3°C | -0.2°C | 96 mm | 81% | 0.2 m/s | 5.1 |
| 2012 | 14.6°C | 9.8°C | 4.9°C | 24.7°C | -0.8°C | 115 mm | 78% | 0.2 m/s | 5.4 |
| 2011 | 12.7°C | 8.6°C | 4.4°C | 18.9°C | 0.2°C | 146 mm | 85% | 0.2 m/s | 4.7 |
| 2010 | 12.9°C | 8.8°C | 4.6°C | 19.9°C | -0.3°C | 162 mm | 83% | 0.2 m/s | 4.8 |
| 2009 | 15.3°C | 10.4°C | 5.5°C | 23.8°C | 1.6°C | 137 mm | 79% | 0.2 m/s | 5.7 |
| 2008 | 15.5°C | 10.9°C | 6.3°C | 27.5°C | 1.5°C | 88 mm | 82% | 0.2 m/s | 4.6 |
| 2007 | 15.9°C | 10.7°C | 5.5°C | 26.3°C | 1.9°C | 59 mm | 79% | 0.2 m/s | 5.8 |
| 2006 | 16.2°C | 11.2°C | 6.2°C | 25.9°C | 0.5°C | 97 mm | 79% | 0.2 m/s | 5.5 |
| 2005 | 17.3°C | 12.6°C | 8.0°C | 31.7°C | 4.8°C | 116 mm | 81% | 0.2 m/s | 4.9 |
| 2004 | 15.3°C | 11.3°C | 7.4°C | 21.0°C | 4.5°C | 137 mm | 83% | 0.2 m/s | 4.6 |
| 2003 | 14.5°C | 10.1°C | 5.7°C | 24.6°C | 0.7°C | 70 mm | 81% | 0.2 m/s | 5.1 |
| 2002 | 13.6°C | 9.2°C | 4.8°C | 20.4°C | -0.7°C | 95 mm | 82% | 0.2 m/s | 4.9 |
| 2001 | 15.4°C | 10.5°C | 5.7°C | 28.2°C | 0.1°C | 95 mm | 77% | 0.3 m/s | 5.8 |
| 2000 | 13.7°C | 9.7°C | 5.6°C | 20.7°C | 1.3°C | 128 mm | 84% | 0.2 m/s | 4.9 |
| 1999 | 12.9°C | 8.4°C | 4.0°C | 25.0°C | -2.2°C | 120 mm | 82% | 0.2 m/s | 5.3 |
| 1998 | 14.5°C | 10.6°C | 6.7°C | 26.9°C | 1.4°C | 109 mm | 86% | 0.2 m/s | 4.7 |
| 1997 | 17.3°C | 12.5°C | 7.6°C | 25.6°C | 0.1°C | 105 mm | 81% | 0.2 m/s | 5.3 |
| 1996 | 12.5°C | 8.6°C | 4.7°C | 18.8°C | 0.8°C | 161 mm | 83% | 0.2 m/s | 4.6 |
| 1995 | 17.4°C | 12.5°C | 7.5°C | 22.8°C | 2.2°C | 56 mm | 77% | 0.3 m/s | 5.6 |
| 1994 | 16.2°C | 11.5°C | 6.7°C | 22.6°C | 0.3°C | 70 mm | 79% | 0.3 m/s | 4.8 |
| 1993 | 18.0°C | 13.1°C | 8.2°C | 28.6°C | 3.1°C | 139 mm | 81% | 0.2 m/s | 4.4 |
| 1992 | 18.5°C | 13.1°C | 7.6°C | 27.5°C | 1.7°C | 43 mm | 74% | 0.3 m/s | 5.8 |
| 1991 | 13.7°C | 9.7°C | 5.6°C | 18.0°C | 2.0°C | 92 mm | 84% | 0.2 m/s | 4.3 |
| 1990 | 14.6°C | 10.3°C | 6.0°C | 24.3°C | 2.5°C | 106 mm | 82% | 0.2 m/s | 4.6 |
| 1989 | 14.9°C | 10.4°C | 6.0°C | 23.4°C | 2.6°C | 112 mm | 82% | 0.2 m/s | 4.6 |
| 1988 | 14.9°C | 10.2°C | 5.4°C | 26.6°C | 0.7°C | 141 mm | 81% | 0.2 m/s | 4.3 |
| 1987 | 16.4°C | 11.4°C | 6.5°C | 28.7°C | 1.4°C | 121 mm | 78% | 0.2 m/s | 5.3 |
| 1986 | 14.5°C | 10.2°C | 5.8°C | 27.0°C | 1.3°C | 143 mm | 83% | 0.2 m/s | 4.4 |
| 1985 | 15.4°C | 10.7°C | 5.9°C | 26.0°C | -0.2°C | 81 mm | 80% | 0.2 m/s | 5 |
| 1984 ❄️ 🌧️ | 12.3°C | 8.3°C | 4.4°C | 25.0°C | 0.8°C | 216 mm | 84% | 0.2 m/s | 4.9 |
| 1983 | 16.8°C | 12.0°C | 7.2°C | 33.0°C | 2.5°C | 74 mm | 78% | 0.2 m/s | — |
| 1982 | 14.9°C | 10.1°C | 5.3°C | 23.3°C | 1.3°C | 47 mm | 78% | 0.2 m/s | — |
| 1981 | 14.2°C | 10.0°C | 5.7°C | 25.6°C | 2.0°C | 100 mm | 83% | 0.2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 15.4°C with lows near 6.3°C (mean 10.9°C), based on 45 years of NASA POWER data.
May averages 105 mm of rainfall in Snohomish, one of the drier months. The wettest on record was 216 mm in 1984.
The hottest May reached 33°C in 1983. The coldest dipped to -2.2°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.2°C. Daytime highs moved from 14.7°C to 14.8°C and overnight lows from 5.7°C to 6.1°C over the same span.
May is one of the warmer months of the year in Snohomish and one of the drier months, so plan for around 15.4°C daytime highs and 6.3°C at night.
Not quite — May is the 8th coolest month in Snohomish, averaging 10.9°C.
For May in Snohomish, pack warm layers and a jacket for chilly mornings, with typical highs of 15.4°C and lows of 6.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 81% — quite humid.
Average wind speed in May is 0.2 m/s. The windiest May on record averaged 0.3 m/s (1992).
The wettest May on record was 1984 with 216 mm. On average, May sees 105 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 Snohomish 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.
