Winthrop, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a community in Kennebec County, Maine.
This Afternoon
72°F
Sunny
Sunny, with a high near 72. Northwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Sunny | 15 mph NW | 0% |
| Tonight | 43°F | Mostly Clear | 5 to 10 mph NW | 0% |
| Saturday | 64°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 44°F | Partly Cloudy | 0 mph | 0% |
| Sunday | 61°F | Chance Rain Showers | 0 to 10 mph S | 38% |
| Sunday Night | 47°F | Chance Rain Showers | 0 to 5 mph W | 37% |
| Monday | 64°F | Sunny | 5 to 10 mph N | 3% |
| Monday Night | 44°F | Partly Cloudy | 5 mph N | 0% |
| Tuesday | 62°F | Mostly Sunny | 5 mph NE | 0% |
| Tuesday Night | 42°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Wednesday | 63°F | Mostly Sunny | 5 mph NE | 1% |
| Wednesday Night | 43°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Thursday | 63°F | Partly Sunny then Slight Chance Rain Showers | 5 mph NE | 20% |
| Thursday Night | 46°F | Slight Chance Rain Showers | 5 mph NE | 24% |
Forecast source: National Weather Service (api.weather.gov) for Winthrop (44.323, -69.951). Updated through the day.
Growing snapshot for Winthrop
Last spring frost
Apr 27
First fall frost
Oct 16
Growing season
172 days
Hardiness zone
5b
More local growing data for Winthrop: nearby ZIP 04364 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Augusta State Ap, Me (8.2 mi from Winthrop). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.