August is one of the warmer months of the year in Snohomish, with average highs near 21.8°C and lows around 12°C (mean 16.9°C). It is one of the drier months, averaging 45 mm of rainfall and 78% relative humidity across the period.
August is one of the warmer months of the year in Snohomish. Across 45 years of records, the warmest August in Snohomish was 2022 — when the month averaged 19.4°C — while the coldest was 1995 at 14.2°C. Typical August days reach 21.8°C with nights near 12°C. The long-term trend is warming, about 0.3°C per decade.
August is one of the drier months in Snohomish, averaging 45 mm of rainfall. The wettest August on record was 2004 with 156 mm, while the driest was 2012 at 4 mm.
Relative humidity in Snohomish during August averages 78%. The most humid August was 2025 at 85%, and the least humid was 2017 at 72%.
August receives about 5.4 kWh/m²/day of solar energy in Snohomish. The sunniest August was 1998 at 6.1 kWh/m²/day, and the cloudiest was 1995 at 4.6.
Average wind speed in Snohomish during August is 0.2 m/s. The windiest Augusts were 2019, 2020 and 2022, 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 | 16.5°C | 16.7°C | 16.6°C | 17.4°C | 17.4°C | +0.9°C |
| Avg High | 21.6°C | 21.5°C | 21.4°C | 22.3°C | 22.3°C | +0.7°C |
| Avg Low | 11.5°C | 11.9°C | 11.7°C | 12.5°C | 12.5°C | +1°C |
| Avg Rain | 40 mm | 51 mm | 49 mm | 36 mm | 51 mm | +11 mm |
August temperatures in Snohomish have risen by about 1.1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 5.1°C (2010) to a record high of 35.8°C (1981).
Rainfall in August is one of the drier months, averaging 45 mm, with a wettest year of 156 mm.
One of the best times to visit Snohomish
August is one of the best times to visit Snohomish. Expect days averaging 21.8°C and nights around 12°C (mean 16.9°C) — warmer than Snohomish's yearly average — with moderate rainfall (45 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 20.9°C | 16.0°C | 11.2°C | 33.7°C | 7.0°C | 103 mm | 85% | 0.2 m/s | 5.2 |
| 2024 | 21.7°C | 16.8°C | 12.0°C | 30.8°C | 6.5°C | 85 mm | 81% | 0.2 m/s | 4.8 |
| 2023 | 23.5°C | 18.5°C | 13.6°C | 31.3°C | 8.9°C | 39 mm | 76% | 0.2 m/s | 5.5 |
| 2022 🔥 | 24.7°C | 19.4°C | 14.1°C | 33.1°C | 8.2°C | 17 mm | 76% | 0.3 m/s | 5.9 |
| 2021 | 21.9°C | 17.2°C | 12.6°C | 33.2°C | 7.8°C | 37 mm | 79% | 0.2 m/s | 5.3 |
| 2020 | 21.3°C | 16.4°C | 11.5°C | 35.3°C | 6.8°C | 25 mm | 80% | 0.3 m/s | 5.9 |
| 2019 | 22.5°C | 17.7°C | 12.9°C | 28.0°C | 9.3°C | 25 mm | 77% | 0.3 m/s | 5.2 |
| 2018 | 22.6°C | 17.7°C | 12.7°C | 30.0°C | 7.9°C | 19 mm | 73% | 0.3 m/s | 5.2 |
| 2017 | 24.2°C | 19.0°C | 13.9°C | 30.7°C | 9.6°C | 9 mm | 72% | 0.3 m/s | 5.9 |
| 2016 | 22.4°C | 17.5°C | 12.5°C | 31.5°C | 9.6°C | 19 mm | 76% | 0.3 m/s | 5.7 |
| 2015 | 22.6°C | 17.6°C | 12.7°C | 29.1°C | 9.6°C | 79 mm | 72% | 0.3 m/s | 5.4 |
| 2014 | 22.6°C | 18.0°C | 13.4°C | 32.9°C | 10.3°C | 67 mm | 79% | 0.3 m/s | 5.5 |
| 2013 | 22.0°C | 17.4°C | 12.8°C | 26.8°C | 9.8°C | 70 mm | 81% | 0.2 m/s | 5 |
| 2012 | 22.5°C | 17.3°C | 12.1°C | 32.3°C | 7.6°C | 4 mm | 77% | 0.3 m/s | 5.6 |
| 2011 | 20.4°C | 15.8°C | 11.3°C | 27.7°C | 7.7°C | 14 mm | 80% | 0.2 m/s | 5.5 |
| 2010 | 20.8°C | 16.0°C | 11.1°C | 31.7°C | 5.1°C | 56 mm | 80% | 0.2 m/s | 5.3 |
| 2009 | 21.3°C | 16.5°C | 11.7°C | 32.1°C | 7.3°C | 38 mm | 78% | 0.2 m/s | 4.9 |
| 2008 | 21.2°C | 16.4°C | 11.5°C | 32.8°C | 6.8°C | 106 mm | 81% | 0.2 m/s | 4.8 |
| 2007 | 20.0°C | 15.5°C | 11.0°C | 29.3°C | 8.1°C | 36 mm | 81% | 0.2 m/s | 5 |
| 2006 | 21.1°C | 16.1°C | 11.2°C | 26.5°C | 7.3°C | 12 mm | 75% | 0.3 m/s | 5.8 |
| 2005 | 22.4°C | 17.3°C | 12.1°C | 30.3°C | 9.1°C | 25 mm | 75% | 0.3 m/s | 5.8 |
| 2004 🌧️ | 23.0°C | 18.3°C | 13.7°C | 32.4°C | 10.2°C | 156 mm | 78% | 0.2 m/s | 5.1 |
| 2003 | 22.5°C | 17.4°C | 12.2°C | 28.5°C | 8.9°C | 10 mm | 73% | 0.3 m/s | 5.8 |
| 2002 | 20.9°C | 16.1°C | 11.3°C | 29.4°C | 7.9°C | 15 mm | 78% | 0.2 m/s | 5.8 |
| 2001 | 21.4°C | 16.7°C | 11.9°C | 30.5°C | 8.6°C | 64 mm | 80% | 0.3 m/s | 5 |
| 2000 | 19.8°C | 15.2°C | 10.6°C | 25.6°C | 6.4°C | 29 mm | 81% | 0.2 m/s | 5.5 |
| 1999 | 21.2°C | 16.7°C | 12.3°C | 29.6°C | 6.9°C | 48 mm | 83% | 0.2 m/s | 5.1 |
| 1998 | 22.5°C | 17.4°C | 12.3°C | 30.0°C | 8.3°C | 11 mm | 78% | 0.2 m/s | 6.1 |
| 1997 | 22.5°C | 17.7°C | 12.9°C | 28.3°C | 10.0°C | 42 mm | 80% | 0.3 m/s | 5.6 |
| 1996 | 21.8°C | 16.8°C | 11.7°C | 31.8°C | 6.8°C | 53 mm | 77% | 0.3 m/s | 5.3 |
| 1995 ❄️ | 18.5°C | 14.2°C | 9.9°C | 23.4°C | 5.6°C | 105 mm | 82% | 0.2 m/s | 4.6 |
| 1994 | 21.3°C | 16.5°C | 11.7°C | 26.7°C | 9.4°C | 20 mm | 77% | 0.2 m/s | 5.1 |
| 1993 | 20.9°C | 16.0°C | 11.2°C | 31.2°C | 6.7°C | 34 mm | 80% | 0.3 m/s | 4.9 |
| 1992 | 22.4°C | 17.3°C | 12.2°C | 30.8°C | 7.1°C | 38 mm | 75% | 0.3 m/s | 5.5 |
| 1991 | 21.3°C | 16.9°C | 12.5°C | 26.6°C | 8.3°C | 83 mm | 83% | 0.2 m/s | 4.9 |
| 1990 | 22.2°C | 17.4°C | 12.5°C | 31.8°C | 7.8°C | 77 mm | 79% | 0.2 m/s | 5.1 |
| 1989 | 19.8°C | 15.3°C | 10.7°C | 25.3°C | 8.3°C | 61 mm | 82% | 0.2 m/s | 5 |
| 1988 | 21.2°C | 15.9°C | 10.7°C | 31.4°C | 7.0°C | 22 mm | 78% | 0.3 m/s | 5.2 |
| 1987 | 21.8°C | 16.6°C | 11.4°C | 31.7°C | 7.5°C | 21 mm | 74% | 0.3 m/s | 5.6 |
| 1986 | 24.1°C | 18.7°C | 13.3°C | 34.2°C | 10.3°C | 10 mm | 74% | 0.3 m/s | 5.6 |
| 1985 | 21.1°C | 15.7°C | 10.2°C | 28.4°C | 7.1°C | 34 mm | 73% | 0.3 m/s | 5.4 |
| 1984 | 20.3°C | 15.5°C | 10.7°C | 27.1°C | 6.4°C | 46 mm | 79% | 0.2 m/s | 5.3 |
| 1983 | 21.3°C | 16.6°C | 11.9°C | 28.1°C | 9.8°C | 78 mm | 80% | 0.2 m/s | — |
| 1982 | 21.1°C | 16.3°C | 11.5°C | 31.3°C | 7.5°C | 61 mm | 78% | 0.2 m/s | — |
| 1981 | 23.8°C | 18.3°C | 12.8°C | 35.8°C | 8.0°C | 31 mm | 75% | 0.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 21.8°C with lows near 12°C (mean 16.9°C), based on 45 years of NASA POWER data.
August averages 45 mm of rainfall in Snohomish, one of the drier months. The wettest on record was 156 mm in 2004.
The hottest August reached 35.8°C in 1981. The coldest dipped to 5.1°C in 2010.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.1°C. Daytime highs moved from 21.5°C to 22.5°C and overnight lows from 11.4°C to 12.7°C over the same span.
August is one of the warmer months of the year in Snohomish and one of the drier months, so plan for around 21.8°C daytime highs and 12°C at night.
Not quite — August is the 12th coolest month in Snohomish, averaging 16.9°C.
For August in Snohomish, pack light layers you can adjust through the day, with typical highs of 21.8°C and lows of 12°C.
Relative humidity in August averages 78% — quite humid.
Average wind speed in August is 0.2 m/s. The windiest August on record averaged 0.3 m/s (1981).
The wettest August on record was 2004 with 156 mm. On average, August sees 45 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
