Onset, MA Weather & Growing Conditions
Today
69°F
Sunny
Sunny. High near 69, with temperatures falling to around 61 in the afternoon. Southwest wind 8 to 12 mph, with gusts as high as 22 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 69°F | Sunny | 8 to 12 mph SW | 3% |
| Tonight | 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% |
| Tuesday Night | 37°F | Mostly Clear | 10 mph W | 4% |
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.