August is one of the warmer months of the year in Kennewick, with average highs near 31.4°C and lows around 16.4°C (mean 23.9°C). It is one of the drier months, averaging 8 mm of rainfall and 43% relative humidity across the period.
August is one of the warmer months of the year in Kennewick. Across 45 years of records, the warmest August in Kennewick was 2022 — when the month averaged 27.1°C — while the coldest was 1995 at 20.8°C. Typical August days reach 31.4°C with nights near 16.4°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Kennewick, averaging 8 mm of rainfall. The wettest August on record was 1990 with 25 mm, while the driest were 1988 and 2000 at 0 mm.
Relative humidity in Kennewick during August averages 43%. The most humid August was 1983 at 50%, and the least humid was 2005 at 35%.
August receives about 6.3 kWh/m²/day of solar energy in Kennewick. The sunniest August was 1998 at 7 kWh/m²/day, and the cloudiest was 2023 at 5.5.
Average wind speed in Kennewick during August is 2.5 m/s. The windiest August was 2000 at 2.9 m/s, while the calmest was 2017 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.1°C | 23.4°C | 23.8°C | 24.5°C | 24.9°C | +1.8°C |
| Avg High | 30.8°C | 30.9°C | 31.4°C | 32.0°C | 32.2°C | +1.4°C |
| Avg Low | 15.5°C | 16.0°C | 16.2°C | 17.1°C | 17.6°C | +2.1°C |
| Avg Rain | 8 mm | 9 mm | 7 mm | 7 mm | 6 mm | -2 mm |
August temperatures in Kennewick have risen by about 1.7°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 9.1°C (2008) to a record high of 42.3°C (2009).
Rainfall in August is one of the drier months, averaging 8 mm, with a wettest year of 25 mm.
One of the best times to visit Kennewick
August is one of the best times to visit Kennewick. Expect days averaging 31.4°C and nights around 16.4°C (mean 23.9°C) — warmer than Kennewick's yearly average — with low rainfall (8 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 | 31.2°C | 23.8°C | 16.4°C | 39.2°C | 10.9°C | 10 mm | 47% | 2.2 m/s | 5.9 |
| 2024 | 31.2°C | 23.8°C | 16.4°C | 40.3°C | 9.6°C | 4 mm | 42% | 2.6 m/s | 6.1 |
| 2023 | 31.9°C | 25.1°C | 18.3°C | 41.7°C | 12.9°C | 11 mm | 42% | 2.3 m/s | 5.5 |
| 2022 🔥 | 34.9°C | 27.1°C | 19.3°C | 39.4°C | 13.9°C | 6 mm | 39% | 2.4 m/s | 6.5 |
| 2021 | 31.6°C | 24.7°C | 17.8°C | 40.1°C | 11.3°C | 4 mm | 39% | 2.5 m/s | 5.8 |
| 2020 | 32.3°C | 24.7°C | 17.1°C | 40.2°C | 11.8°C | 2 mm | 38% | 2.5 m/s | 6.6 |
| 2019 | 32.0°C | 24.7°C | 17.4°C | 38.6°C | 12.9°C | 11 mm | 44% | 2.4 m/s | 6.3 |
| 2018 | 31.4°C | 24.2°C | 17.1°C | 39.9°C | 12.1°C | 8 mm | 39% | 2.5 m/s | 5.8 |
| 2017 | 33.8°C | 25.9°C | 18.0°C | 38.9°C | 12.5°C | 5 mm | 39% | 2.1 m/s | 6 |
| 2016 | 32.0°C | 24.5°C | 17.0°C | 37.7°C | 13.1°C | 1 mm | 38% | 2.5 m/s | 6.7 |
| 2015 | 31.9°C | 24.5°C | 17.2°C | 40.6°C | 13.5°C | 3 mm | 37% | 2.6 m/s | 6 |
| 2014 | 32.3°C | 25.3°C | 18.2°C | 40.2°C | 13.1°C | 19 mm | 43% | 2.4 m/s | 6.1 |
| 2013 | 32.1°C | 24.9°C | 17.6°C | 36.8°C | 14.5°C | 11 mm | 46% | 2.4 m/s | 6.1 |
| 2012 | 32.8°C | 24.7°C | 16.7°C | 38.5°C | 11.3°C | 1 mm | 40% | 2.5 m/s | 6.8 |
| 2011 | 31.7°C | 23.8°C | 15.8°C | 37.0°C | 11.4°C | 3 mm | 44% | 2.6 m/s | 6.9 |
| 2010 | 30.4°C | 23.0°C | 15.6°C | 38.3°C | 10.5°C | 7 mm | 43% | 2.7 m/s | 6.5 |
| 2009 | 31.7°C | 24.2°C | 16.7°C | 42.3°C | 11.8°C | 8 mm | 41% | 2.5 m/s | 6.3 |
| 2008 | 30.5°C | 23.3°C | 16.1°C | 41.9°C | 9.1°C | 11 mm | 44% | 2.7 m/s | 6.2 |
| 2007 | 30.3°C | 22.8°C | 15.2°C | 38.7°C | 11.2°C | 6 mm | 43% | 2.5 m/s | 6.6 |
| 2006 | 31.2°C | 23.4°C | 15.5°C | 39.4°C | 10.4°C | 1 mm | 40% | 2.4 m/s | 6.6 |
| 2005 | 32.6°C | 24.6°C | 16.5°C | 39.4°C | 12.4°C | 1 mm | 35% | 2.5 m/s | 6.9 |
| 2004 | 32.0°C | 25.0°C | 17.9°C | 40.0°C | 13.8°C | 24 mm | 46% | 2.7 m/s | 6 |
| 2003 | 32.0°C | 24.4°C | 16.8°C | 36.9°C | 13.3°C | 11 mm | 40% | 2.4 m/s | 6.4 |
| 2002 | 30.6°C | 23.0°C | 15.4°C | 38.2°C | 11.1°C | 2 mm | 39% | 2.4 m/s | 6.7 |
| 2001 | 32.8°C | 24.8°C | 16.7°C | 39.1°C | 12.5°C | 6 mm | 42% | 2.4 m/s | 6.6 |
| 2000 | 30.5°C | 22.7°C | 14.9°C | 36.9°C | 10.4°C | 0 mm | 43% | 2.9 m/s | 6.8 |
| 1999 | 31.1°C | 24.0°C | 16.8°C | 37.3°C | 10.2°C | 11 mm | 48% | 2.7 m/s | 6.1 |
| 1998 | 32.2°C | 24.4°C | 16.6°C | 41.4°C | 11.8°C | 2 mm | 45% | 2.3 m/s | 7 |
| 1997 | 31.5°C | 24.1°C | 16.7°C | 37.5°C | 13.7°C | 7 mm | 48% | 2.3 m/s | 6.5 |
| 1996 | 31.3°C | 23.5°C | 15.7°C | 40.4°C | 10.6°C | 2 mm | 43% | 2.6 m/s | 6.6 |
| 1995 ❄️ | 28.1°C | 20.8°C | 13.5°C | 35.3°C | 9.4°C | 8 mm | 48% | 2.7 m/s | 6.1 |
| 1994 | 31.1°C | 23.3°C | 15.5°C | 37.8°C | 12.7°C | 2 mm | 42% | 2.7 m/s | 6.6 |
| 1993 | 29.1°C | 21.7°C | 14.3°C | 36.6°C | 9.2°C | 16 mm | 47% | 2.5 m/s | 6.2 |
| 1992 | 31.6°C | 23.9°C | 16.3°C | 40.0°C | 9.6°C | 14 mm | 39% | 2.4 m/s | 6.2 |
| 1991 | 32.3°C | 24.8°C | 17.3°C | 37.5°C | 11.5°C | 7 mm | 45% | 2.3 m/s | 6.4 |
| 1990 🌧️ | 31.1°C | 23.9°C | 16.8°C | 41.0°C | 10.4°C | 25 mm | 46% | 2.4 m/s | 5.9 |
| 1989 | 28.4°C | 21.5°C | 14.6°C | 38.0°C | 11.4°C | 20 mm | 49% | 2.4 m/s | 5.9 |
| 1988 | 30.9°C | 22.8°C | 14.8°C | 37.9°C | 11.6°C | 0 mm | 40% | 2.6 m/s | 6.4 |
| 1987 | 30.7°C | 22.8°C | 14.9°C | 36.9°C | 10.6°C | 4 mm | 39% | 2.3 m/s | 6.5 |
| 1986 | 33.5°C | 25.3°C | 17.2°C | 38.8°C | 14.5°C | 2 mm | 38% | 2.2 m/s | 6.4 |
| 1985 | 29.0°C | 21.5°C | 14.0°C | 35.3°C | 10.3°C | 6 mm | 42% | 2.6 m/s | 6.2 |
| 1984 | 30.1°C | 22.5°C | 15.0°C | 38.1°C | 10.2°C | 10 mm | 46% | 2.7 m/s | 6.2 |
| 1983 | 31.0°C | 23.7°C | 16.3°C | 36.0°C | 13.0°C | 16 mm | 50% | 2.3 m/s | — |
| 1982 | 30.8°C | 23.3°C | 15.8°C | 39.6°C | 12.2°C | 11 mm | 46% | 2.5 m/s | — |
| 1981 | 33.2°C | 24.9°C | 16.6°C | 39.1°C | 11.7°C | 1 mm | 39% | 2.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 31.4°C with lows near 16.4°C (mean 23.9°C), based on 45 years of NASA POWER data.
August averages 8 mm of rainfall in Kennewick, one of the drier months. The wettest on record was 25 mm in 1990.
The hottest August reached 42.3°C in 2009. The coldest dipped to 9.1°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.7°C. Daytime highs moved from 30.8°C to 32.2°C and overnight lows from 15.5°C to 17.6°C over the same span.
August is one of the warmer months of the year in Kennewick and one of the drier months, so plan for around 31.4°C daytime highs and 16.4°C at night.
Not quite — August is the 11th coolest month in Kennewick, averaging 23.9°C.
For August in Kennewick, pack light, breathable clothing and sun protection, with typical highs of 31.4°C and lows of 16.4°C.
Relative humidity in August averages 43% — relatively dry.
Average wind speed in August is 2.5 m/s. The windiest August on record averaged 2.9 m/s (2000).
The wettest August on record was 1990 with 25 mm. On average, August sees 8 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 Kennewick 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.
