Dennis, MA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dennis, a community in Barnstable County, Massachusetts.
Today
63°F
Mostly Sunny
Mostly sunny, with a high near 63. Northeast wind 5 to 14 mph, with gusts as high as 24 mph.
7-day forecast for Dennis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Mostly Sunny | 5 to 14 mph NE | 0% |
| Tonight | 56°F | Partly Cloudy | 6 mph E | 0% |
| Sunday | 65°F | Mostly Cloudy then Rain Showers Likely | 6 to 9 mph SE | 72% |
| Sunday Night | 58°F | Rain Showers | 6 to 15 mph E | 83% |
| Monday | 65°F | Chance Rain Showers then Mostly Cloudy | 15 to 18 mph N | 41% |
| Monday Night | 56°F | Mostly Cloudy | 10 to 15 mph NE | 2% |
| Tuesday | 63°F | Mostly Cloudy | 17 mph NE | 7% |
| Tuesday Night | 57°F | Mostly Cloudy | 16 to 20 mph NE | 3% |
| Wednesday | 63°F | Partly Sunny | 20 to 24 mph NE | 4% |
| Wednesday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 22 to 25 mph NE | 24% |
| Thursday | 64°F | Chance Rain Showers | 25 to 29 mph NE | 35% |
| Thursday Night | 57°F | Chance Rain Showers | 24 to 29 mph NE | 43% |
| Friday | 64°F | Chance Rain Showers | 24 to 32 mph NE | 43% |
| Friday Night | 57°F | Chance Showers And Thunderstorms | 26 to 32 mph NE | 46% |
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
Barnstable Town
Bourne
Brewster
Buzzards Bay
Chatham
Dennis Port
East Dennis
East Falmouth
East Harwich
East Sandwich
Falmouth
Forestdale
Harwich Center
Harwich Port
Mashpee Neck
Monomoscoy Island
Monument Beach
New Seabury
North Eastham
North Falmouth
Northwest Harwich
Orleans
Pocasset
Popponesset
Popponesset Island
Provincetown
Sagamore
Sandwich
Seabrook
Seconsett Island
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 19, 2026.