Harman US

Dennis, MA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Dennis, a community in Barnstable County, Massachusetts.

Tonight
48°F
Partly Cloudy
Partly cloudy, with a low around 48. East wind around 6 mph.

7-day forecast for Dennis

WhenTempForecastWindPrecip
Tonight 48°F Partly Cloudy 6 mph E 0%
Sunday 64°F Mostly Cloudy then Rain Showers 5 to 12 mph SE 99%
Sunday Night 61°F Rain Showers 5 to 10 mph E 96%
Monday 65°F Chance Rain Showers then Mostly Cloudy 9 to 18 mph NE 50%
Monday Night 57°F Mostly Cloudy 9 to 14 mph NE 2%
Tuesday 64°F Partly Sunny 16 mph NE 4%
Tuesday Night 57°F Mostly Cloudy 14 to 18 mph NE 3%
Wednesday 64°F Partly Sunny 20 to 23 mph NE 4%
Wednesday Night 57°F Mostly Cloudy then Slight Chance Rain Showers 20 to 23 mph NE 17%
Thursday 64°F Chance Rain Showers 23 to 26 mph NE 31%
Thursday Night 58°F Chance Rain Showers 28 mph NE 41%
Friday 65°F Chance Rain Showers 26 to 30 mph NE 46%
Friday Night 58°F Chance Rain Showers 26 to 30 mph NE 46%
Saturday 65°F Chance Rain Showers 25 mph N 43%

Forecast source: National Weather Service (api.weather.gov) for Dennis (41.730, -70.197). Updated through the day.

Growing snapshot for Dennis

Last spring frost
Apr 22
First fall frost
Oct 28
Growing season
188 days
Hardiness zone
7b

More local growing data for Dennis: nearby ZIP 02638 weather · frost dates · planting calendar · Massachusetts frost dates

Nearby towns & communities

All Massachusetts locations ›

Climate data from the nearest NOAA station, Hyannis Barnstable Muni Ap, Ma (6 mi from Dennis). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.