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
Partly Cloudy
Partly cloudy, with a low around 52. Southwest wind around 6 mph.
7-day forecast for Onset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Partly Cloudy | 6 mph SW | 4% |
| Wednesday | 70°F | Sunny | 6 to 13 mph SW | 6% |
| Wednesday Night | 55°F | Patchy Fog | 5 to 9 mph SW | 3% |
| Thursday | 71°F | Mostly Cloudy | 6 to 12 mph SW | 6% |
| Thursday Night | 61°F | Mostly Cloudy then Light Rain Likely | 8 mph SW | 62% |
| Friday | 68°F | Rain | 9 mph S | 88% |
| Friday Night | 58°F | Rain | 6 mph S | 87% |
| Saturday | 63°F | Light Rain | 6 to 9 mph SW | 81% |
| Saturday Night | 45°F | Chance Light Rain | 7 mph NW | 48% |
| Sunday | 59°F | Chance Light Rain | 6 to 9 mph W | 25% |
| Sunday Night | 40°F | Partly Cloudy | 6 mph W | 10% |
| Monday | 58°F | Chance Light Rain | 6 to 12 mph W | 25% |
| Monday Night | 39°F | Chance Light Rain | 10 mph W | 25% |
| Tuesday | 57°F | Mostly Sunny | 10 to 16 mph W | 12% |
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 Nov 4, 2026.