Onset, MA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Onset, a community in Plymouth County, Massachusetts.

This Afternoon

70°F

Sunny

Sunny. High near 70, with temperatures falling to around 61 in the afternoon. Southwest wind around 12 mph.

7-day forecast for Onset

When	Temp	Forecast	Wind	Precip
This Afternoon	70°F	Sunny	12 mph SW	3%
Tonight	59°F	Partly Cloudy	8 mph SW	3%
Thursday	70°F	Mostly Cloudy	6 to 12 mph SW	8%
Thursday Night	62°F	Chance Light Rain	9 mph SW	73%
Friday	67°F	Heavy Rain	8 mph S	90%
Friday Night	57°F	Rain	1 to 5 mph S	95%
Saturday	64°F	Rain Likely	2 to 7 mph W	74%
Saturday Night	46°F	Chance Light Rain	5 to 10 mph W	27%
Sunday	58°F	Chance Light Rain	9 to 13 mph W	26%
Sunday Night	41°F	Partly Cloudy	9 mph W	6%
Monday	56°F	Sunny	10 to 14 mph W	13%
Monday Night	37°F	Mostly Clear	6 to 9 mph W	10%
Tuesday	58°F	Sunny	9 to 14 mph W	2%
Tuesday Night	38°F	Mostly Clear	6 to 9 mph W	2%

Forecast source: National Weather Service (api.weather.gov) for Onset (41.746, -70.668). Updated through the day.

Growing snapshot for Onset

Last spring frost

Apr 21

First fall frost

Oct 24

Growing season

186 days

Hardiness zone

More local growing data for Onset: nearby ZIP 02558 weather · frost dates · planting calendar · Massachusetts frost dates

Nearby towns & communities

Abington Bridgewater Town Brockton Cedar Crest Duxbury Green Harbor Hanson Hingham Hull Kingston Marion Center Marshfield Marshfield Hills Mattapoisett Center Middleborough Center North Lakeville North Pembroke North Plymouth North Scituate Ocean Bluff-Brant Rock Plymouth Scituate South Duxbury The Pinehills Wareham Center West Wareham Weweantic White Island Shores

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Climate data from the nearest NOAA station, E Wareham, Ma (1.6 mi from Onset). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.