August is one of the warmer months of the year in Bothell, with average highs near 23°C and lows around 13.2°C (mean 18.1°C). It is one of the drier months, averaging 33 mm of rainfall and 75% relative humidity across the period.
August is one of the warmer months of the year in Bothell. Across 45 years of records, the warmest August in Bothell was 2022 — when the month averaged 20.2°C — while the coldest was 1995 at 15.7°C. Typical August days reach 23°C with nights near 13.2°C. The long-term trend is warming, about 0.2°C per decade.
August is one of the drier months in Bothell, averaging 33 mm of rainfall. The wettest August on record was 2004 with 110 mm, while the driest was 2012 at 3 mm.
Relative humidity in Bothell during August averages 75%. The most humid August was 2025 at 85%, and the least humid was 1985 at 69%.
August receives about 5.4 kWh/m²/day of solar energy in Bothell. The sunniest August was 1998 at 6.1 kWh/m²/day, and the cloudiest was 1995 at 4.6.
Average wind speed in Bothell during August is 0.4 m/s. The windiest Augusts were 2023, 2024 and 2025, among others at 0.4 m/s, while the calmest were 2023, 2024 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 | 17.9°C | 18.0°C | 17.9°C | 18.4°C | 18.5°C | +0.6°C |
| Avg High | 23.0°C | 22.7°C | 22.8°C | 23.3°C | 23.3°C | +0.3°C |
| Avg Low | 12.7°C | 13.2°C | 13.0°C | 13.6°C | 13.7°C | +1°C |
| Avg Rain | 28 mm | 39 mm | 35 mm | 26 mm | 39 mm | +11 mm |
August temperatures in Bothell have risen by about 0.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 7.8°C (1984) to a record high of 36°C (1981).
Rainfall in August is one of the drier months, averaging 33 mm, with a wettest year of 110 mm.
One of the best times to visit Bothell
August is one of the best times to visit Bothell. Expect days averaging 23°C and nights around 13.2°C (mean 18.1°C) — warmer than Bothell's yearly average — with moderate rainfall (33 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 | 16.6°C | 12.2°C | 29.2°C | 9.1°C | 85 mm | 85% | 0.4 m/s | 5.2 |
| 2024 | 22.6°C | 18.0°C | 13.4°C | 29.7°C | 9.7°C | 70 mm | 79% | 0.4 m/s | 4.8 |
| 2023 | 24.2°C | 19.3°C | 14.5°C | 30.8°C | 11.3°C | 34 mm | 75% | 0.4 m/s | 5.5 |
| 2022 🔥 | 25.3°C | 20.2°C | 15.1°C | 32.1°C | 11.0°C | 8 mm | 76% | 0.4 m/s | 5.9 |
| 2021 | 23.7°C | 18.7°C | 13.7°C | 31.3°C | 9.9°C | 19 mm | 74% | 0.4 m/s | 5.3 |
| 2020 | 22.9°C | 17.9°C | 13.0°C | 35.3°C | 10.0°C | 19 mm | 76% | 0.4 m/s | 5.9 |
| 2019 | 23.9°C | 19.0°C | 14.1°C | 28.3°C | 11.0°C | 20 mm | 74% | 0.4 m/s | 5.2 |
| 2018 | 23.7°C | 18.8°C | 14.0°C | 30.5°C | 10.6°C | 12 mm | 73% | 0.4 m/s | 5.2 |
| 2017 | 24.3°C | 19.2°C | 14.2°C | 30.5°C | 10.8°C | 5 mm | 75% | 0.4 m/s | 5.9 |
| 2016 | 23.8°C | 18.7°C | 13.7°C | 32.4°C | 11.4°C | 12 mm | 74% | 0.4 m/s | 5.7 |
| 2015 | 23.5°C | 18.6°C | 13.8°C | 28.4°C | 11.4°C | 62 mm | 72% | 0.4 m/s | 5.4 |
| 2014 | 24.1°C | 19.2°C | 14.3°C | 32.1°C | 11.0°C | 52 mm | 75% | 0.4 m/s | 5.5 |
| 2013 | 23.2°C | 18.6°C | 13.9°C | 26.3°C | 11.7°C | 49 mm | 79% | 0.4 m/s | 5 |
| 2012 | 23.0°C | 18.0°C | 13.1°C | 32.1°C | 9.5°C | 3 mm | 76% | 0.4 m/s | 5.6 |
| 2011 | 21.6°C | 16.9°C | 12.3°C | 25.2°C | 9.4°C | 10 mm | 77% | 0.4 m/s | 5.5 |
| 2010 | 22.2°C | 17.4°C | 12.6°C | 31.7°C | 8.5°C | 38 mm | 76% | 0.4 m/s | 5.3 |
| 2009 | 23.1°C | 18.1°C | 13.1°C | 33.5°C | 9.9°C | 27 mm | 74% | 0.4 m/s | 4.9 |
| 2008 | 22.2°C | 17.5°C | 12.8°C | 30.4°C | 8.8°C | 72 mm | 78% | 0.4 m/s | 4.8 |
| 2007 | 21.6°C | 17.0°C | 12.3°C | 28.3°C | 10.2°C | 25 mm | 77% | 0.4 m/s | 5 |
| 2006 | 22.3°C | 17.2°C | 12.2°C | 26.9°C | 9.2°C | 6 mm | 73% | 0.4 m/s | 5.8 |
| 2005 | 24.0°C | 18.8°C | 13.6°C | 29.2°C | 11.1°C | 20 mm | 71% | 0.4 m/s | 5.8 |
| 2004 🌧️ | 24.1°C | 19.4°C | 14.6°C | 32.3°C | 12.0°C | 110 mm | 76% | 0.4 m/s | 5.1 |
| 2003 | 23.6°C | 18.6°C | 13.5°C | 27.1°C | 10.5°C | 9 mm | 72% | 0.4 m/s | 5.8 |
| 2002 | 22.5°C | 17.5°C | 12.6°C | 28.9°C | 10.1°C | 8 mm | 73% | 0.4 m/s | 5.8 |
| 2001 | 22.8°C | 18.0°C | 13.2°C | 29.9°C | 10.2°C | 55 mm | 76% | 0.4 m/s | 5 |
| 2000 | 21.7°C | 16.9°C | 12.2°C | 26.8°C | 8.6°C | 21 mm | 76% | 0.4 m/s | 5.5 |
| 1999 | 22.1°C | 17.7°C | 13.4°C | 25.7°C | 8.1°C | 40 mm | 82% | 0.4 m/s | 5.1 |
| 1998 | 23.3°C | 18.4°C | 13.5°C | 27.7°C | 10.8°C | 8 mm | 76% | 0.4 m/s | 6.1 |
| 1997 | 23.3°C | 18.8°C | 14.4°C | 28.3°C | 12.1°C | 40 mm | 78% | 0.4 m/s | 5.6 |
| 1996 | 22.2°C | 17.4°C | 12.5°C | 30.9°C | 9.0°C | 31 mm | 76% | 0.4 m/s | 5.3 |
| 1995 ❄️ | 20.0°C | 15.7°C | 11.4°C | 24.9°C | 8.9°C | 77 mm | 79% | 0.4 m/s | 4.6 |
| 1994 | 23.2°C | 18.3°C | 13.4°C | 27.8°C | 11.5°C | 13 mm | 72% | 0.4 m/s | 5.1 |
| 1993 | 22.5°C | 17.6°C | 12.8°C | 33.5°C | 8.8°C | 24 mm | 76% | 0.4 m/s | 4.9 |
| 1992 | 23.7°C | 18.5°C | 13.3°C | 31.9°C | 9.8°C | 27 mm | 72% | 0.4 m/s | 5.5 |
| 1991 | 22.7°C | 18.2°C | 13.8°C | 27.6°C | 10.2°C | 80 mm | 79% | 0.4 m/s | 4.9 |
| 1990 | 23.8°C | 18.9°C | 13.9°C | 32.6°C | 10.5°C | 52 mm | 74% | 0.4 m/s | 5.1 |
| 1989 | 21.9°C | 17.1°C | 12.3°C | 25.2°C | 9.8°C | 41 mm | 77% | 0.4 m/s | 5 |
| 1988 | 22.3°C | 17.1°C | 12.0°C | 29.1°C | 9.7°C | 17 mm | 73% | 0.4 m/s | 5.2 |
| 1987 | 23.3°C | 17.9°C | 12.5°C | 30.7°C | 9.6°C | 16 mm | 71% | 0.4 m/s | 5.6 |
| 1986 | 25.3°C | 19.9°C | 14.4°C | 34.0°C | 11.6°C | 5 mm | 71% | 0.4 m/s | 5.6 |
| 1985 | 23.0°C | 17.5°C | 11.9°C | 30.8°C | 9.0°C | 25 mm | 69% | 0.4 m/s | 5.4 |
| 1984 | 21.7°C | 16.9°C | 12.1°C | 27.2°C | 7.8°C | 27 mm | 76% | 0.4 m/s | 5.3 |
| 1983 | 22.2°C | 17.6°C | 12.9°C | 25.4°C | 10.5°C | 63 mm | 78% | 0.4 m/s | — |
| 1982 | 22.3°C | 17.3°C | 12.4°C | 27.6°C | 9.4°C | 41 mm | 76% | 0.4 m/s | — |
| 1981 | 24.8°C | 19.4°C | 13.9°C | 36.0°C | 9.8°C | 21 mm | 73% | 0.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 23°C with lows near 13.2°C (mean 18.1°C), based on 45 years of NASA POWER data.
August averages 33 mm of rainfall in Bothell, one of the drier months. The wettest on record was 110 mm in 2004.
The hottest August reached 36°C in 1981. The coldest dipped to 7.8°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.9°C. Daytime highs moved from 22.8°C to 23.3°C and overnight lows from 12.6°C to 13.8°C over the same span.
August is one of the warmer months of the year in Bothell and one of the drier months, so plan for around 23°C daytime highs and 13.2°C at night.
Not quite — August is the 12th coolest month in Bothell, averaging 18.1°C.
For August in Bothell, pack light layers you can adjust through the day, with typical highs of 23°C and lows of 13.2°C.
Relative humidity in August averages 75% — quite humid.
Average wind speed in August is 0.4 m/s. The windiest August on record averaged 0.4 m/s (1981).
The wettest August on record was 2004 with 110 mm. On average, August sees 33 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 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.
