Lake Bosworth, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Bosworth, a community in Snohomish County, Washington.
Tonight
50°F
Mostly Clear then Patchy Fog
Patchy fog between 2am and 4am. Mostly clear, with a low around 50. Northwest wind around 2 mph.
7-day forecast for Lake Bosworth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Clear then Patchy Fog | 2 mph NW | 0% |
| Sunday | 73°F | Mostly Sunny | 1 mph NNW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 1 mph NW | 0% |
| Monday | 71°F | Patchy Fog then Partly Sunny | 2 mph NW | 0% |
| Monday Night | 49°F | Partly Cloudy | 2 mph N | 1% |
| Tuesday | 68°F | Partly Sunny | 1 mph NW | 2% |
| Tuesday Night | 48°F | Mostly Cloudy | 2 mph NNE | 11% |
| Wednesday | 65°F | Slight Chance Light Rain | 2 mph S | 17% |
| Wednesday Night | 46°F | Mostly Cloudy | 1 mph N | 7% |
| Thursday | 64°F | Mostly Cloudy then Slight Chance Light Rain | 1 mph N | 22% |
| Thursday Night | 48°F | Chance Light Rain | 1 mph SSW | 52% |
| Friday | 61°F | Light Rain Likely | 1 mph SSE | 56% |
| Friday Night | 44°F | Chance Light Rain | 3 mph SSE | 44% |
| Saturday | 64°F | Slight Chance Light Rain then Partly Sunny | 2 mph WNW | 16% |
Forecast source: National Weather Service (api.weather.gov) for Lake Bosworth (48.055, -121.982). Updated through the day.
Growing snapshot for Lake Bosworth
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
188 days
Hardiness zone
8b
More local growing data for Lake Bosworth: nearby ZIP 98290 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Alderwood Manor
Arlington
Arlington Heights
Bothell East
Bothell West
Brier
Bunk Foss
Canyon Creek
Cathcart
Cavalero
Chain Lake
Clearview
Darrington
Eastmont
Edmonds
Esperance
Everett
Fobes Hill
Gold Bar
Granite Falls
Hat Island
Kayak Point
Lake Cassidy
Lake Cavanaugh
Lake Goodwin
Lake Roesiger
Lake Stevens
Lake Stickney
Larch Way
Lochsloy
Climate data from the nearest NOAA station, Monroe, Wa (7.6 mi from Lake Bosworth). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.