Onset, MA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onset, a community in Plymouth County, Massachusetts.
Today
82°F
Mostly Sunny
Mostly sunny, with a high near 82. Southwest wind 2 to 8 mph.
7-day forecast for Onset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Mostly Sunny | 2 to 8 mph SW | 0% |
| Tonight | 64°F | Mostly Cloudy | 0 to 7 mph SW | 12% |
| Wednesday | 81°F | Mostly Sunny | 0 to 9 mph W | 13% |
| Wednesday Night | 68°F | Mostly Cloudy | 3 to 7 mph SW | 6% |
| Thursday | 83°F | Mostly Sunny | 3 to 12 mph SW | 5% |
| Thursday Night | 72°F | Partly Cloudy | 6 to 10 mph SW | 4% |
| Friday | 85°F | Mostly Sunny | 6 to 13 mph SW | 9% |
| Friday Night | 72°F | Partly Cloudy | 3 to 12 mph SW | 12% |
| Saturday | 84°F | Mostly Sunny then Chance Rain Showers | 3 to 9 mph SW | 26% |
| Saturday Night | 71°F | Chance Rain Showers | 2 to 8 mph SW | 35% |
| Sunday | 84°F | Mostly Sunny | 2 to 10 mph SW | 12% |
| Sunday Night | 71°F | Partly Cloudy | 5 to 9 mph SW | 14% |
| Monday | 85°F | Mostly Sunny | 5 to 12 mph SW | 7% |
| Monday Night | 70°F | Partly Cloudy | 10 mph SW | 9% |
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
7a
More local growing data for Onset: nearby ZIP 02558 weather · frost dates · planting calendar · Massachusetts frost dates
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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 Aug 4, 2026.