Winthrop, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a community in Kennebec County, Maine.
Overnight
46°F
Mostly Cloudy
Mostly cloudy, with a low around 46. South wind around 0 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Mostly Cloudy | 0 mph | 3% |
| Wednesday | 72°F | Partly Sunny | 0 to 5 mph SW | 5% |
| Wednesday Night | 49°F | Partly Cloudy | 5 mph S | 3% |
| Thursday | 70°F | Mostly Cloudy then Chance Light Rain | 5 to 10 mph S | 38% |
| Thursday Night | 56°F | Mostly Cloudy then Chance Light Rain | 0 to 10 mph SW | 29% |
| Friday | 68°F | Chance Light Rain | 0 mph | 41% |
| Friday Night | 50°F | Light Rain | 5 to 10 mph NE | 89% |
| Saturday | 58°F | Light Rain | 5 to 10 mph NE | 82% |
| Saturday Night | 43°F | Chance Light Rain | 5 to 10 mph N | 49% |
| Sunday | 53°F | Chance Light Rain | 5 to 10 mph NW | 43% |
| Sunday Night | 35°F | Slight Chance Light Rain then Partly Cloudy | 5 mph W | 15% |
| Monday | 51°F | Mostly Sunny then Slight Chance Light Rain | 5 to 10 mph W | 18% |
| Monday Night | 32°F | Slight Chance Light Rain | 5 to 10 mph W | 16% |
| Tuesday | 51°F | Mostly Sunny | 5 to 10 mph SW | 13% |
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 Nov 4, 2026.