Onset, MA Weather & Growing Conditions
Today
81°F
Mostly Sunny
Mostly sunny, with a high near 81. Southwest wind 3 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Mostly Sunny | 3 to 9 mph SW | 0% |
| Tonight | 64°F | Mostly Cloudy | 1 to 8 mph SW | 12% |
| Wednesday | 80°F | Mostly Sunny | 0 to 9 mph SW | 13% |
| Wednesday Night | 68°F | Mostly Cloudy | 3 to 8 mph SW | 6% |
| Thursday | 82°F | Mostly Sunny | 3 to 13 mph SW | 5% |
| Thursday Night | 72°F | Partly Cloudy | 6 to 12 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 10 mph SW | 26% |
| Saturday Night | 71°F | Chance Rain Showers | 2 to 8 mph SW | 34% |
| Sunday | 84°F | Mostly Sunny | 2 to 10 mph SW | 11% |
| Sunday Night | 71°F | Partly Cloudy | 5 to 9 mph SW | 13% |
| Monday | 84°F | Mostly Sunny | 5 to 13 mph SW | 7% |
| Monday Night | 70°F | Partly Cloudy | 12 mph SW | 9% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onset, MA
Last spring frost
Apr 21
First fall frost
Oct 24
Growing season
186 days
Hardiness zone
7a
Explore more for Onset, MA: full frost dates · planting calendar · Massachusetts frost dates
Climate data from the nearest NOAA station, E Wareham, Ma (1.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.