Harwich Port, MA Weather & Growing Conditions
Today
78°F
Mostly Sunny
Mostly sunny, with a high near 78. Southwest wind 5 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Mostly Sunny | 5 to 9 mph SW | 0% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Rain Showers | 2 to 8 mph S | 16% |
| Wednesday | 78°F | Slight Chance Rain Showers then Mostly Sunny | 2 to 10 mph W | 18% |
| Wednesday Night | 70°F | Mostly Cloudy | 6 to 9 mph SW | 4% |
| Thursday | 80°F | Mostly Sunny | 6 to 13 mph SW | 4% |
| Thursday Night | 72°F | Partly Cloudy | 12 mph SW | 2% |
| Friday | 82°F | Mostly Sunny | 9 to 14 mph SW | 3% |
| Friday Night | 72°F | Partly Cloudy | 8 to 13 mph SW | 10% |
| Saturday | 81°F | Mostly Sunny | 7 to 12 mph SW | 8% |
| Saturday Night | 72°F | Partly Cloudy | 6 to 12 mph SW | 13% |
| Sunday | 81°F | Mostly Sunny | 6 to 13 mph SW | 11% |
| Sunday Night | 71°F | Partly Cloudy | 8 to 13 mph SW | 9% |
| Monday | 81°F | Mostly Sunny | 8 to 14 mph SW | 9% |
| Monday Night | 70°F | Partly Cloudy | 14 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Harwich Port, MA
Last spring frost
Apr 13
First fall frost
Nov 3
Growing season
204 days
Hardiness zone
7b
Explore more for Harwich Port, MA: full frost dates · planting calendar · Massachusetts frost dates
Climate data from the nearest NOAA station, W Harwich, Ma (2.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.