August is one of the warmer months of the year in Bonney Lake, with average highs near 21.6°C and lows around 9.8°C (mean 15.7°C). It is one of the drier months, averaging 33 mm of rainfall and 73% relative humidity across the period.
August is one of the warmer months of the year in Bonney Lake. Across 45 years of records, the warmest August in Bonney Lake was 2017 — when the month averaged 18.5°C — while the coldest was 1995 at 12.6°C. Typical August days reach 21.6°C with nights near 9.8°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Bonney Lake, averaging 33 mm of rainfall. The wettest August on record was 2004 with 144 mm, while the driest was 2012 at 3 mm.
Relative humidity in Bonney Lake during August averages 73%. The most humid August was 1999 at 83%, and the least humid was 2017 at 64%.
August receives about 5.4 kWh/m²/day of solar energy in Bonney Lake. The sunniest August was 1998 at 6.1 kWh/m²/day, and the cloudiest was 1995 at 4.6.
Average wind speed in Bonney Lake during August is 0.2 m/s. The windiest Augusts were 2017, 2018 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 | 15.3°C | 15.2°C | 15.6°C | 16.3°C | 16.5°C | +1.2°C |
| Avg High | 21.4°C | 20.9°C | 21.4°C | 22.2°C | 22.6°C | +1.2°C |
| Avg Low | 9.2°C | 9.5°C | 9.7°C | 10.5°C | 10.4°C | +1.2°C |
| Avg Rain | 29 mm | 38 mm | 38 mm | 27 mm | 31 mm | +2 mm |
August temperatures in Bonney Lake have risen by about 1.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3.1°C (2000) to a record high of 35.2°C (1981).
Rainfall in August is one of the drier months, averaging 33 mm, with a wettest year of 144 mm.
One of the best times to visit Bonney Lake
August is one of the best times to visit Bonney Lake. Expect days averaging 21.6°C and nights around 9.8°C (mean 15.7°C) — warmer than Bonney Lake'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 | 21.9°C | 15.7°C | 9.6°C | 32.7°C | 3.8°C | 64 mm | 73% | 0.2 m/s | 5.2 |
| 2024 | 21.5°C | 15.6°C | 9.8°C | 31.8°C | 6.6°C | 50 mm | 75% | 0.2 m/s | 4.8 |
| 2023 | 24.1°C | 17.8°C | 11.4°C | 34.6°C | 6.2°C | 34 mm | 68% | 0.2 m/s | 5.5 |
| 2022 | 24.5°C | 18.1°C | 11.7°C | 33.3°C | 6.0°C | 8 mm | 70% | 0.3 m/s | 5.9 |
| 2021 | 22.6°C | 16.5°C | 10.3°C | 33.8°C | 4.8°C | 13 mm | 69% | 0.2 m/s | 5.3 |
| 2020 | 20.7°C | 15.0°C | 9.3°C | 33.9°C | 5.7°C | 16 mm | 76% | 0.2 m/s | 5.9 |
| 2019 | 22.7°C | 16.6°C | 10.6°C | 30.8°C | 5.9°C | 26 mm | 73% | 0.2 m/s | 5.2 |
| 2018 | 23.4°C | 17.1°C | 10.9°C | 32.7°C | 7.5°C | 16 mm | 65% | 0.3 m/s | 5.2 |
| 2017 🔥 | 25.0°C | 18.5°C | 12.0°C | 31.3°C | 6.6°C | 7 mm | 64% | 0.3 m/s | 5.9 |
| 2016 | 21.9°C | 15.9°C | 10.0°C | 29.3°C | 4.9°C | 19 mm | 72% | 0.3 m/s | 5.7 |
| 2015 | 23.4°C | 16.9°C | 10.3°C | 30.4°C | 6.4°C | 52 mm | 64% | 0.2 m/s | 5.4 |
| 2014 | 21.9°C | 16.6°C | 11.4°C | 32.6°C | 7.3°C | 54 mm | 76% | 0.2 m/s | 5.5 |
| 2013 | 21.7°C | 16.2°C | 10.8°C | 27.2°C | 6.9°C | 47 mm | 77% | 0.2 m/s | 5 |
| 2012 | 22.2°C | 16.2°C | 10.2°C | 33.0°C | 5.4°C | 3 mm | 74% | 0.2 m/s | 5.6 |
| 2011 | 19.8°C | 14.5°C | 9.3°C | 26.9°C | 5.8°C | 8 mm | 77% | 0.2 m/s | 5.5 |
| 2010 | 19.8°C | 14.4°C | 9.0°C | 29.7°C | 3.1°C | 34 mm | 77% | 0.2 m/s | 5.3 |
| 2009 | 21.5°C | 15.7°C | 9.8°C | 32.9°C | 4.3°C | 25 mm | 73% | 0.2 m/s | 4.9 |
| 2008 | 20.6°C | 15.2°C | 9.7°C | 33.3°C | 4.1°C | 72 mm | 77% | 0.2 m/s | 4.8 |
| 2007 | 20.0°C | 14.4°C | 8.9°C | 29.5°C | 5.1°C | 27 mm | 77% | 0.2 m/s | 5 |
| 2006 | 21.8°C | 15.5°C | 9.3°C | 29.3°C | 6.0°C | 8 mm | 69% | 0.2 m/s | 5.8 |
| 2005 | 22.5°C | 16.2°C | 10.0°C | 30.0°C | 6.2°C | 17 mm | 69% | 0.2 m/s | 5.8 |
| 2004 🌧️ | 22.8°C | 17.4°C | 11.9°C | 32.6°C | 7.1°C | 144 mm | 74% | 0.2 m/s | 5.1 |
| 2003 | 23.1°C | 16.6°C | 10.2°C | 30.6°C | 5.7°C | 7 mm | 67% | 0.2 m/s | 5.8 |
| 2002 | 21.0°C | 15.1°C | 9.2°C | 29.3°C | 4.6°C | 15 mm | 73% | 0.2 m/s | 5.8 |
| 2001 | 21.3°C | 15.6°C | 9.9°C | 30.1°C | 6.3°C | 44 mm | 76% | 0.2 m/s | 5 |
| 2000 | 19.2°C | 13.8°C | 8.3°C | 27.9°C | 3.1°C | 16 mm | 77% | 0.2 m/s | 5.5 |
| 1999 | 20.1°C | 15.0°C | 10.0°C | 28.7°C | 4.4°C | 48 mm | 83% | 0.2 m/s | 5.1 |
| 1998 | 22.3°C | 16.2°C | 10.1°C | 31.3°C | 6.8°C | 12 mm | 75% | 0.2 m/s | 6.1 |
| 1997 | 21.5°C | 16.0°C | 10.4°C | 26.2°C | 7.4°C | 34 mm | 78% | 0.2 m/s | 5.6 |
| 1996 | 21.7°C | 15.7°C | 9.7°C | 32.1°C | 4.8°C | 34 mm | 72% | 0.2 m/s | 5.3 |
| 1995 ❄️ | 17.9°C | 12.6°C | 7.3°C | 24.6°C | 3.2°C | 66 mm | 80% | 0.2 m/s | 4.6 |
| 1994 | 21.0°C | 15.1°C | 9.2°C | 26.1°C | 5.6°C | 14 mm | 75% | 0.2 m/s | 5.1 |
| 1993 | 19.6°C | 14.1°C | 8.6°C | 34.3°C | 4.3°C | 21 mm | 79% | 0.2 m/s | 4.9 |
| 1992 | 23.1°C | 16.4°C | 9.7°C | 32.1°C | 4.1°C | 30 mm | 66% | 0.3 m/s | 5.5 |
| 1991 | 20.6°C | 15.4°C | 10.2°C | 26.9°C | 5.7°C | 53 mm | 82% | 0.2 m/s | 4.9 |
| 1990 | 21.2°C | 15.6°C | 9.9°C | 31.0°C | 6.1°C | 71 mm | 78% | 0.2 m/s | 5.1 |
| 1989 | 19.4°C | 14.1°C | 8.8°C | 26.4°C | 6.2°C | 44 mm | 79% | 0.2 m/s | 5 |
| 1988 | 21.2°C | 14.8°C | 8.5°C | 31.2°C | 4.5°C | 16 mm | 72% | 0.2 m/s | 5.2 |
| 1987 | 22.1°C | 15.5°C | 9.0°C | 33.0°C | 3.8°C | 13 mm | 69% | 0.2 m/s | 5.6 |
| 1986 | 24.4°C | 17.9°C | 11.4°C | 32.8°C | 6.9°C | 10 mm | 66% | 0.2 m/s | 5.6 |
| 1985 | 20.8°C | 14.5°C | 8.1°C | 28.6°C | 3.8°C | 33 mm | 67% | 0.2 m/s | 5.4 |
| 1984 | 19.9°C | 14.2°C | 8.5°C | 26.4°C | 3.5°C | 21 mm | 76% | 0.2 m/s | 5.3 |
| 1983 | 19.8°C | 14.6°C | 9.4°C | 30.2°C | 5.9°C | 65 mm | 82% | 0.2 m/s | — |
| 1982 | 20.9°C | 14.9°C | 9.0°C | 31.0°C | 4.6°C | 33 mm | 74% | 0.2 m/s | — |
| 1981 | 23.7°C | 17.1°C | 10.5°C | 35.2°C | 5.8°C | 25 mm | 69% | 0.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 21.6°C with lows near 9.8°C (mean 15.7°C), based on 45 years of NASA POWER data.
August averages 33 mm of rainfall in Bonney Lake, one of the drier months. The wettest on record was 144 mm in 2004.
The hottest August reached 35.2°C in 1981. The coldest dipped to 3.1°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.6°C. Daytime highs moved from 21°C to 22.9°C and overnight lows from 9.1°C to 10.6°C over the same span.
August is one of the warmer months of the year in Bonney Lake and one of the drier months, so plan for around 21.6°C daytime highs and 9.8°C at night.
Not quite — August is the 12th coolest month in Bonney Lake, averaging 15.7°C.
For August in Bonney Lake, pack light layers you can adjust through the day, with typical highs of 21.6°C and lows of 9.8°C.
Relative humidity in August averages 73% — moderately 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 144 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 Bonney Lake 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.
