West Haven-Sylvan, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for West Haven-Sylvan, a community in Washington County, Oregon.
Today
55°F
Patchy Fog then Light Rain Likely
Patchy fog before 9am, then rain likely. Mostly cloudy. High near 55, with temperatures falling to around 53 in the afternoon. South southeast wind around 2 mph. Chance of precipitation is 60%.
7-day forecast for West Haven-Sylvan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 55°F | Patchy Fog then Light Rain Likely | 2 mph SSE | 64% |
| Tonight | 47°F | Light Rain | 5 mph SSW | 89% |
| Thursday | 56°F | Mostly Sunny | 2 mph S | 6% |
| Thursday Night | 45°F | Mostly Cloudy then Slight Chance Light Rain | 1 mph ESE | 18% |
| Friday | 55°F | Chance Light Rain | 2 mph SSE | 30% |
| Friday Night | 47°F | Chance Light Rain then Mostly Cloudy | 1 mph S | 30% |
| Saturday | 60°F | Partly Sunny then Slight Chance Light Rain | 2 mph SSE | 20% |
| Saturday Night | 50°F | Light Rain | 2 to 12 mph S | 76% |
| Sunday | 56°F | Chance Light Rain | 1 to 9 mph SSW | 43% |
| Sunday Night | 45°F | Slight Chance Light Rain then Mostly Cloudy | 1 mph NNE | 15% |
| Monday | 54°F | Chance Light Rain | 1 mph ESE | 32% |
| Monday Night | 47°F | Chance Light Rain | 1 to 5 mph SSE | 38% |
| Tuesday | 56°F | Chance Light Rain | 1 to 5 mph S | 40% |
| Tuesday Night | 48°F | Chance Light Rain | 3 mph S | 41% |
Forecast source: National Weather Service (api.weather.gov) for West Haven-Sylvan (45.516, -122.765). Updated through the day.
Growing snapshot for West Haven-Sylvan
Last spring frost
Feb 11
First fall frost
Dec 5
Growing season
303 days
Hardiness zone
8b
More local growing data for West Haven-Sylvan: nearby ZIP 97225 weather · frost dates · planting calendar · Oregon frost dates
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Climate data from the nearest NOAA station, Nature Park-Beaverton, Or (3.4 mi from West Haven-Sylvan). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.