Onset, MA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onset, a community in Plymouth County, Massachusetts.
Overnight
52°F
Mostly Cloudy
Mostly cloudy, with a low around 52. North wind around 9 mph.
7-day forecast for Onset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Cloudy | 9 mph N | 0% |
| Saturday | 64°F | Mostly Sunny | 5 to 9 mph NE | 0% |
| Saturday Night | 49°F | Partly Cloudy | 3 mph E | 0% |
| Sunday | 66°F | Mostly Cloudy then Rain Showers Likely | 2 to 8 mph SE | 74% |
| Sunday Night | 54°F | Rain Showers | 3 to 12 mph E | 81% |
| Monday | 65°F | Chance Rain Showers then Mostly Cloudy | 12 to 15 mph N | 36% |
| Monday Night | 51°F | Mostly Cloudy | 5 to 10 mph NE | 2% |
| Tuesday | 63°F | Mostly Cloudy | 10 to 15 mph NE | 7% |
| Tuesday Night | 51°F | Mostly Cloudy | 10 to 14 mph NE | 3% |
| Wednesday | 63°F | Partly Sunny | 15 to 20 mph NE | 4% |
| Wednesday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 14 to 20 mph NE | 24% |
| Thursday | 63°F | Chance Rain Showers | 22 mph NE | 35% |
| Thursday Night | 52°F | Chance Rain Showers | 16 to 21 mph NE | 40% |
| Friday | 63°F | Chance Rain Showers | 24 mph NE | 42% |
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 Sep 19, 2026.