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.
Overnight
42°F
Patchy Fog
Patchy fog before 4am. Partly cloudy, with a low around 42. South southeast wind around 2 mph.
7-day forecast for Bryn Mawr-Skyway
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Patchy Fog | 2 mph SSE | 1% |
| Wednesday | 58°F | Partly Sunny then Chance Light Rain | 2 to 6 mph S | 43% |
| Wednesday Night | 49°F | Light Rain | 6 to 12 mph S | 89% |
| Thursday | 57°F | Mostly Sunny | 6 to 9 mph SSW | 6% |
| Thursday Night | 47°F | Mostly Cloudy then Light Rain Likely | 7 mph SSE | 62% |
| Friday | 56°F | Light Rain | 5 to 12 mph SSE | 77% |
| Friday Night | 49°F | Light Rain Likely | 5 mph SSE | 69% |
| Saturday | 62°F | Chance Light Rain | 2 mph SSE | 29% |
| Saturday Night | 51°F | Light Rain | 2 to 15 mph S | 81% |
| Sunday | 56°F | Light Rain Likely | 5 to 14 mph SSW | 61% |
| Sunday Night | 45°F | Slight Chance Light Rain | 5 mph SE | 15% |
| Monday | 55°F | Chance Light Rain | 3 mph SSE | 39% |
| Monday Night | 48°F | Light Rain Likely | 2 to 7 mph SSE | 56% |
| Tuesday | 58°F | Light Rain Likely | 5 to 9 mph S | 56% |
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
Nearby towns & communities
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Covington
Des Moines
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East Renton Highlands
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High Bridge
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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 Nov 4, 2026.