Groton, MA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Groton, a community in Middlesex County, Massachusetts.
This Afternoon
73°F
Mostly Cloudy
Mostly cloudy. High near 73, with temperatures falling to around 64 in the afternoon. Southwest wind around 3 mph.
7-day forecast for Groton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Cloudy | 3 mph SW | 10% |
| Tonight | 50°F | Mostly Cloudy | 3 mph SW | 3% |
| Wednesday | 76°F | Mostly Sunny | 2 to 8 mph SW | 5% |
| Wednesday Night | 54°F | Partly Cloudy | 5 mph SW | 2% |
| Thursday | 74°F | Chance Light Rain | 5 to 9 mph SW | 28% |
| Thursday Night | 61°F | Chance Light Rain | 2 to 6 mph SW | 54% |
| Friday | 70°F | Rain | 3 mph S | 82% |
| Friday Night | 54°F | Rain | 3 mph NE | 82% |
| Saturday | 63°F | Light Rain Likely | 6 mph NW | 70% |
| Saturday Night | 41°F | Chance Light Rain | 5 mph NW | 47% |
| Sunday | 59°F | Chance Light Rain then Mostly Sunny | 7 mph W | 25% |
| Sunday Night | 35°F | Partly Cloudy | 3 mph W | 10% |
| Monday | 57°F | Mostly Sunny then Slight Chance Light Rain | 5 to 9 mph W | 19% |
| Monday Night | 33°F | Slight Chance Light Rain | 6 mph W | 19% |
Forecast source: National Weather Service (api.weather.gov) for Groton (42.612, -71.565). Updated through the day.
Growing snapshot for Groton
Last spring frost
Apr 29
First fall frost
Oct 8
Growing season
162 days
Hardiness zone
6a
More local growing data for Groton: nearby ZIP 01450 weather · frost dates · planting calendar · Massachusetts frost dates
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Climate data from the nearest NOAA station, Nashua Cwsu, Nh (9.5 mi from Groton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.