Onset, MA Weather & Growing Conditions
Overnight
53°F
Mostly Cloudy
Mostly cloudy, with a low around 53. Southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Cloudy | 6 mph SW | 2% |
| Wednesday | 69°F | Sunny | 6 to 12 mph SW | 3% |
| Wednesday Night | 58°F | Partly Cloudy then Patchy Fog | 6 to 9 mph SW | 2% |
| Thursday | 70°F | Patchy Fog then Partly Sunny | 7 to 13 mph SW | 2% |
| Thursday Night | 61°F | Light Rain Likely | 7 to 10 mph SW | 67% |
| Friday | 67°F | Light Rain | 7 to 10 mph S | 97% |
| Friday Night | 58°F | Light Rain | 7 mph S | 97% |
| Saturday | 64°F | Light Rain | 5 to 9 mph SW | 79% |
| Saturday Night | 46°F | Slight Chance Light Rain | 9 mph NW | 20% |
| Sunday | 58°F | Slight Chance Light Rain then Mostly Sunny | 10 mph W | 17% |
| Sunday Night | 40°F | Partly Cloudy | 7 mph W | 9% |
| Monday | 57°F | Chance Light Rain | 8 to 13 mph W | 25% |
| Monday Night | 38°F | Slight Chance Light Rain then Partly Cloudy | 9 mph W | 20% |
| Tuesday | 58°F | Sunny | 9 to 14 mph W | 6% |
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 Nov 4, 2026.