August is one of the warmer months of the year in Federal Way, with average highs near 23.5°C and lows around 13.2°C (mean 18.4°C). It is one of the drier months, averaging 30 mm of rainfall and 76% relative humidity across the period.
August is one of the warmer months of the year in Federal Way. Across 45 years of records, the warmest August in Federal Way was 1986 — when the month averaged 20.1°C — while the coldest was 1995 at 16.1°C. Typical August days reach 23.5°C with nights near 13.2°C. The long-term August temperature trend is broadly flat.
August is one of the drier months in Federal Way, averaging 30 mm of rainfall. The wettest August on record was 2004 with 108 mm, while the driest was 2012 at 3 mm.
Relative humidity in Federal Way during August averages 76%. The most humid August was 2025 at 86%, and the least humid was 1985 at 69%.
August receives about 5.4 kWh/m²/day of solar energy in Federal Way. The sunniest August was 1998 at 6.1 kWh/m²/day, and the cloudiest was 1995 at 4.6.
Average wind speed in Federal Way during August is 0.5 m/s. The windiest Augusts were 2020, 2021 and 2022, among others at 0.6 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.2°C | 18.3°C | 18.1°C | 18.6°C | 18.6°C | +0.4°C |
| Avg High | 23.7°C | 23.3°C | 23.3°C | 23.6°C | 23.7°C | 0°C |
| Avg Low | 12.7°C | 13.2°C | 13.0°C | 13.6°C | 13.5°C | +0.8°C |
| Avg Rain | 25 mm | 35 mm | 34 mm | 25 mm | 31 mm | +6 mm |
August temperatures in Federal Way have risen by about 0.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 7.4°C (1984) to a record high of 35.2°C (1981).
Rainfall in August is one of the drier months, averaging 30 mm, with a wettest year of 108 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
One of the best times to visit Federal Way
August is one of the best times to visit Federal Way. Expect days averaging 23.5°C and nights around 13.2°C (mean 18.4°C) — warmer than Federal Way's yearly average — with low rainfall (30 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 | 21.2°C | 16.6°C | 11.9°C | 30.3°C | 8.3°C | 73 mm | 86% | 0.5 m/s | 5.2 |
| 2024 | 22.8°C | 18.0°C | 13.1°C | 28.0°C | 9.7°C | 57 mm | 81% | 0.5 m/s | 4.8 |
| 2023 | 25.3°C | 20.0°C | 14.6°C | 32.9°C | 11.2°C | 24 mm | 74% | 0.5 m/s | 5.5 |
| 2022 | 25.2°C | 20.0°C | 14.7°C | 31.4°C | 11.3°C | 5 mm | 78% | 0.6 m/s | 5.9 |
| 2021 | 24.5°C | 19.1°C | 13.6°C | 32.6°C | 8.6°C | 9 mm | 74% | 0.6 m/s | 5.3 |
| 2020 | 23.3°C | 18.1°C | 12.9°C | 33.0°C | 9.5°C | 16 mm | 77% | 0.6 m/s | 5.9 |
| 2019 | 24.6°C | 19.4°C | 14.2°C | 29.4°C | 10.8°C | 23 mm | 74% | 0.5 m/s | 5.2 |
| 2018 | 23.7°C | 18.7°C | 13.6°C | 31.2°C | 11.1°C | 12 mm | 75% | 0.6 m/s | 5.2 |
| 2017 | 24.7°C | 19.5°C | 14.3°C | 29.7°C | 10.7°C | 5 mm | 76% | 0.5 m/s | 5.9 |
| 2016 | 23.8°C | 18.6°C | 13.4°C | 31.1°C | 10.3°C | 14 mm | 76% | 0.6 m/s | 5.7 |
| 2015 | 24.1°C | 18.9°C | 13.7°C | 30.6°C | 11.0°C | 60 mm | 72% | 0.6 m/s | 5.4 |
| 2014 | 24.3°C | 19.2°C | 14.1°C | 31.4°C | 10.7°C | 45 mm | 78% | 0.5 m/s | 5.5 |
| 2013 | 23.2°C | 18.6°C | 14.0°C | 27.7°C | 11.6°C | 48 mm | 81% | 0.5 m/s | 5 |
| 2012 | 23.2°C | 18.1°C | 13.0°C | 32.8°C | 8.4°C | 3 mm | 78% | 0.5 m/s | 5.6 |
| 2011 | 22.1°C | 17.4°C | 12.7°C | 26.9°C | 10.1°C | 11 mm | 79% | 0.5 m/s | 5.5 |
| 2010 | 22.4°C | 17.5°C | 12.5°C | 31.5°C | 7.8°C | 33 mm | 78% | 0.5 m/s | 5.3 |
| 2009 | 23.1°C | 18.1°C | 13.1°C | 31.2°C | 9.8°C | 30 mm | 76% | 0.5 m/s | 4.9 |
| 2008 | 22.2°C | 17.6°C | 13.0°C | 30.5°C | 8.5°C | 64 mm | 80% | 0.6 m/s | 4.8 |
| 2007 | 21.8°C | 17.1°C | 12.3°C | 28.5°C | 10.4°C | 26 mm | 79% | 0.5 m/s | 5 |
| 2006 | 22.9°C | 17.5°C | 12.0°C | 27.7°C | 9.8°C | 5 mm | 75% | 0.5 m/s | 5.8 |
| 2005 | 24.7°C | 19.1°C | 13.5°C | 30.3°C | 10.7°C | 14 mm | 72% | 0.5 m/s | 5.8 |
| 2004 🌧️ | 25.1°C | 19.9°C | 14.8°C | 31.9°C | 12.4°C | 108 mm | 76% | 0.6 m/s | 5.1 |
| 2003 | 24.3°C | 18.9°C | 13.5°C | 28.5°C | 10.7°C | 9 mm | 71% | 0.5 m/s | 5.8 |
| 2002 | 23.1°C | 17.7°C | 12.3°C | 30.5°C | 9.1°C | 9 mm | 74% | 0.5 m/s | 5.8 |
| 2001 | 23.6°C | 18.4°C | 13.2°C | 30.7°C | 10.3°C | 55 mm | 75% | 0.6 m/s | 5 |
| 2000 | 22.0°C | 17.0°C | 12.0°C | 28.0°C | 8.7°C | 17 mm | 78% | 0.6 m/s | 5.5 |
| 1999 | 22.4°C | 17.8°C | 13.1°C | 27.5°C | 8.8°C | 34 mm | 83% | 0.6 m/s | 5.1 |
| 1998 | 23.8°C | 18.8°C | 13.8°C | 33.1°C | 10.8°C | 10 mm | 77% | 0.5 m/s | 6.1 |
| 1997 | 23.9°C | 19.0°C | 14.2°C | 30.8°C | 12.1°C | 45 mm | 79% | 0.5 m/s | 5.6 |
| 1996 | 22.8°C | 17.7°C | 12.6°C | 31.3°C | 8.5°C | 28 mm | 78% | 0.6 m/s | 5.3 |
| 1995 ❄️ | 20.8°C | 16.1°C | 11.5°C | 26.1°C | 8.5°C | 64 mm | 80% | 0.6 m/s | 4.6 |
| 1994 | 24.0°C | 18.6°C | 13.3°C | 28.9°C | 11.2°C | 12 mm | 72% | 0.5 m/s | 5.1 |
| 1993 | 23.1°C | 17.9°C | 12.7°C | 33.6°C | 7.9°C | 20 mm | 77% | 0.6 m/s | 4.9 |
| 1992 | 24.8°C | 19.1°C | 13.3°C | 30.5°C | 9.4°C | 23 mm | 71% | 0.5 m/s | 5.5 |
| 1991 | 23.4°C | 18.6°C | 13.9°C | 28.0°C | 10.0°C | 68 mm | 80% | 0.6 m/s | 4.9 |
| 1990 | 24.1°C | 18.9°C | 13.7°C | 31.6°C | 10.0°C | 44 mm | 76% | 0.6 m/s | 5.1 |
| 1989 | 22.3°C | 17.2°C | 12.1°C | 26.6°C | 9.8°C | 32 mm | 78% | 0.5 m/s | 5 |
| 1988 | 23.6°C | 17.9°C | 12.1°C | 30.8°C | 9.5°C | 15 mm | 72% | 0.5 m/s | 5.2 |
| 1987 | 24.2°C | 18.4°C | 12.6°C | 32.3°C | 9.2°C | 14 mm | 71% | 0.5 m/s | 5.6 |
| 1986 🔥 | 26.0°C | 20.1°C | 14.2°C | 32.5°C | 10.1°C | 6 mm | 71% | 0.5 m/s | 5.6 |
| 1985 | 23.5°C | 17.7°C | 12.0°C | 29.7°C | 8.8°C | 27 mm | 69% | 0.6 m/s | 5.4 |
| 1984 | 22.2°C | 17.2°C | 12.2°C | 26.5°C | 7.4°C | 16 mm | 77% | 0.5 m/s | 5.3 |
| 1983 | 23.0°C | 18.1°C | 13.1°C | 26.0°C | 10.2°C | 66 mm | 78% | 0.5 m/s | — |
| 1982 | 23.1°C | 17.7°C | 12.3°C | 30.1°C | 9.6°C | 30 mm | 75% | 0.5 m/s | — |
| 1981 | 25.6°C | 19.8°C | 13.9°C | 35.2°C | 9.5°C | 20 mm | 72% | 0.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 23.5°C with lows near 13.2°C (mean 18.4°C), based on 45 years of NASA POWER data.
August averages 30 mm of rainfall in Federal Way, one of the drier months. The wettest on record was 108 mm in 2004.
The hottest August reached 35.2°C in 1981. The coldest dipped to 7.4°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.6°C. Daytime highs moved from 23.5°C to 23.8°C and overnight lows from 12.7°C to 13.6°C over the same span.
August is one of the warmer months of the year in Federal Way and one of the drier months, so plan for around 23.5°C daytime highs and 13.2°C at night.
Not quite — August is the 12th coolest month in Federal Way, averaging 18.4°C.
For August in Federal Way, pack light layers you can adjust through the day, with typical highs of 23.5°C and lows of 13.2°C.
Relative humidity in August averages 76% — quite humid.
Average wind speed in August is 0.5 m/s. The windiest August on record averaged 0.6 m/s (1985).
The wettest August on record was 2004 with 108 mm. On average, August sees 30 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 Federal Way 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.
