Winthrop, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a community in Kennebec County, Maine.
Today
64°F
Sunny
Sunny, with a high near 64. Northwest wind 0 to 5 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Sunny | 0 to 5 mph NW | 0% |
| Tonight | 43°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 60°F | Mostly Cloudy then Light Rain Likely | 0 to 10 mph SE | 74% |
| Sunday Night | 43°F | Light Rain Likely then Rain Showers Likely | 0 to 5 mph NE | 69% |
| Monday | 64°F | Mostly Sunny | 5 to 10 mph N | 3% |
| Monday Night | 42°F | Partly Cloudy | 5 to 10 mph N | 0% |
| Tuesday | 62°F | Mostly Sunny | 5 mph NE | 0% |
| Tuesday Night | 41°F | Partly Cloudy | 5 mph NE | 0% |
| Wednesday | 63°F | Mostly Sunny | 5 mph NE | 0% |
| Wednesday Night | 41°F | Partly Cloudy | 0 to 5 mph E | 2% |
| Thursday | 63°F | Slight Chance Rain Showers | 5 mph NE | 20% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph NE | 30% |
| Friday | 63°F | Chance Rain Showers | 10 mph N | 30% |
| Friday Night | 44°F | Chance Rain Showers | 10 to 15 mph NE | 30% |
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 19, 2026.