Harman US

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

WhenTempForecastWindPrecip
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

All Washington locations ›

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.