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Federal Way, WA Weather on May 15
May 15th in Federal Way, WA typically brings mild spring weather, with average highs around 68°F and lows near 48°F. Over 55 years of records, the warmest May 15th was in 1989 (76°F average), while the coldest was 1974 (46°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 15th dates historically, with the wettest May 15th recording 4.7" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
What to Expect on May 15
Planning for May 15th in Federal Way, WA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
May 15 Weather Records for Federal Way
- •The all-time record high for May 15th in Federal Way, WA is 85°F, set in 2023.
- •The coldest May 15th on record dropped to 34°F in 1985.
Frequently Asked Questions
What was the warmest May 15 ever in Federal Way?
The warmest May 15 in Federal Way, WA reached 85°F in 2023. That is 17°F above the long-term average high of 68°F.
What was the coldest May 15 ever in Federal Way?
The coldest May 15 in Federal Way, WA dropped to 34°F in 1985. That is 14°F below the long-term average low of 48°F.
What is the average temperature on May 15 in Federal Way?
On May 15, Federal Way averages a high of 68°F and a low of 48°F based on 55 years of NOAA weather observations from KENT.
How many years of weather data are available for May 15 in Federal Way?
We have 55 years of weather records for May 15 in Federal Way, WA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
May 15 Weather History in Federal Way
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 57°F | 47°F | 0.05" | -- |
| 2024 | 76°F | 53°F | 0" | -- |
| 2023 | 85°F | 61°F | 0" | -- |
| 2022 | 65°F | 52°F | 1.3" | -- |
| 2021 | 73°F | 49°F | 0" | -- |
| 2020 | 68°F | 52°F | 0" | -- |
| 2019 | 67°F | 51°F | 0.23" | -- |
| 2018 | 85°F | 54°F | 0" | -- |
| 2017 | 54°F | 47°F | 0.13" | -- |
| 2016 | 60°F | 52°F | 0.1" | -- |
| 2015 | 68°F | 48°F | 0" | -- |
| 2014 | 82°F | 54°F | 0" | -- |
| 2013 | 64°F | 45°F | 0.64" | -- |
| 2012 | 79°F | 52°F | 0" | -- |
| 2011 | 65°F | 49°F | 4.7" | -- |
| 2010 | 74°F | 49°F | 0" | -- |
| 2009 | 66°F | 43°F | 0" | -- |
| 2008 | 71°F | 54°F | 0" | -- |
| 2007 | 84°F | 44°F | 0" | -- |
| 2006 | 80°F | 52°F | 0" | -- |
| 2005 | 70°F | 58°F | 0.74" | -- |
| 2004 | 70°F | 49°F | 0" | -- |
| 2003 | -- | 43°F | 0.15" | -- |
| 2002 | 61°F | 41°F | 0" | -- |
| 2001 | 61°F | 48°F | 0.76" | -- |
| 2000 | 74°F | 52°F | 0" | -- |
| 1999 | 58°F | 46°F | 0" | -- |
| 1998 | 59°F | 46°F | 0.03" | -- |
| 1997 | 78°F | 54°F | 0" | -- |
| 1996 | 64°F | 48°F | 0.03" | -- |
| 1995 | 78°F | 49°F | 0" | -- |
| 1994 | 63°F | 48°F | 0.66" | -- |
| 1993 | 64°F | 49°F | 0" | -- |
| 1992 | 68°F | 46°F | 0" | -- |
| 1991 | 69°F | 44°F | 0" | -- |
| 1990 | 58°F | 46°F | 0" | -- |
| 1989 | 77°F | 75°F | 0" | -- |
| 1988 | 75°F | 48°F | 0" | -- |
| 1987 | 64°F | 51°F | 0" | -- |
| 1986 | 65°F | 36°F | 0" | -- |
| 1985 | 72°F | 34°F | 0" | -- |
| 1984 | 61°F | 45°F | 0.1" | -- |
| 1983 | 58°F | 43°F | 0.41" | -- |
| 1982 | 71°F | 38°F | 0" | -- |
| 1981 | 63°F | 36°F | 0" | -- |
| 1980 | 63°F | 37°F | 0" | -- |
| 1979 | 71°F | -- | 0" | -- |
| 1978 | 59°F | 47°F | 0.08" | -- |
| 1977 | 63°F | 42°F | 0" | -- |
| 1976 | 76°F | 40°F | 0" | -- |
| 1975 | 65°F | 48°F | 0" | -- |
| 1974 | 55°F | 37°F | 0" | -- |
| 1973 | 81°F | 52°F | 0" | -- |
| 1972 | 75°F | 52°F | 0.23" | -- |
| 1971 | 65°F | 45°F | 0.41" | -- |
Based on 55 years of data from NOAA station: KENT
Monthly Climate Averages
Historical temperature and precipitation averages for Federal Way, WA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.