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.
Overnight
41°F
Mostly Clear
Mostly clear, with a low around 41. Wind around 0 mph.
7-day forecast for West Haven-Sylvan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Mostly Clear | 0 mph | 0% |
| Wednesday | 55°F | Patchy Fog then Light Rain Likely | 2 mph SSE | 64% |
| Wednesday Night | 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% |
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
Nearby towns & communities
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West Slope
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.