Lake Bosworth, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Bosworth, a community in Snohomish County, Washington.
Today
59°F
Mostly Cloudy then Slight Chance Light Rain
A slight chance of rain after 5pm. Mostly cloudy. High near 59, with temperatures falling to around 54 in the afternoon. South southeast wind 0 to 3 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lake Bosworth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 3 mph SSE | 21% |
| Tonight | 46°F | Light Rain | 2 to 7 mph SSE | 92% |
| Thursday | 54°F | Slight Chance Light Rain then Partly Sunny | 3 mph SE | 19% |
| Thursday Night | 44°F | Mostly Cloudy then Light Rain Likely | 2 to 6 mph ESE | 74% |
| Friday | 53°F | Light Rain | 3 to 7 mph ESE | 93% |
| Friday Night | 48°F | Light Rain Likely | 6 mph SE | 74% |
| Saturday | 64°F | Chance Light Rain | 1 to 5 mph ESE | 32% |
| Saturday Night | 47°F | Light Rain | 1 to 9 mph SE | 90% |
| Sunday | 53°F | Light Rain | 0 to 9 mph S | 90% |
| Sunday Night | 39°F | Slight Chance Light Rain then Mostly Cloudy | 0 to 3 mph ENE | 24% |
| Monday | 55°F | Partly Sunny then Slight Chance Light Rain | 0 to 3 mph SE | 23% |
| Monday Night | 44°F | Light Rain Likely | 1 to 9 mph ESE | 61% |
| Tuesday | 55°F | Light Rain Likely | 3 to 8 mph SE | 66% |
| Tuesday Night | 47°F | Light Rain Likely | 3 to 8 mph SE | 66% |
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
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Bunk Foss
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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 Nov 4, 2026.