Bryn Mawr-Skyway, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bryn Mawr-Skyway, a community in King County, Washington.
Today
72°F
Mostly Sunny
Mostly sunny, with a high near 72. West northwest wind around 2 mph.
7-day forecast for Bryn Mawr-Skyway
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Mostly Sunny | 2 mph WNW | 0% |
| Tonight | 54°F | Mostly Clear | 3 mph N | 0% |
| Sunday | 73°F | Mostly Sunny | 1 to 5 mph N | 0% |
| Sunday Night | 53°F | Mostly Clear | 1 to 5 mph N | 0% |
| Monday | 71°F | Mostly Sunny | 1 to 5 mph N | 0% |
| Monday Night | 54°F | Partly Cloudy | 1 to 5 mph NNE | 1% |
| Tuesday | 69°F | Partly Sunny | 3 mph N | 1% |
| Tuesday Night | 53°F | Mostly Cloudy | 2 mph SE | 6% |
| Wednesday | 68°F | Partly Sunny then Slight Chance Light Rain | 3 mph WSW | 15% |
| Wednesday Night | 53°F | Slight Chance Light Rain then Mostly Cloudy | 3 mph NNE | 15% |
| Thursday | 65°F | Mostly Cloudy then Slight Chance Light Rain | 2 to 7 mph NNE | 21% |
| Thursday Night | 52°F | Slight Chance Light Rain | 2 to 7 mph NNE | 21% |
| Friday | 64°F | Slight Chance Light Rain | 2 to 6 mph N | 15% |
| Friday Night | 50°F | Slight Chance Light Rain then Partly Cloudy | 6 mph NNE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Bryn Mawr-Skyway (47.495, -122.241). Updated through the day.
Growing snapshot for Bryn Mawr-Skyway
Last spring frost
Mar 13
First fall frost
Nov 16
Growing season
248 days
Hardiness zone
9a
More local growing data for Bryn Mawr-Skyway: nearby ZIP 98178 weather · frost dates · planting calendar · Washington frost dates
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Climate data from the nearest NOAA station, Renton Muni Ap, Wa (1.5 mi from Bryn Mawr-Skyway). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.