Winthrop, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a community in Kennebec County, Maine.
Tonight
46°F
Chance Rain Showers
A chance of rain showers before 1am. Cloudy, with a low around 46. Southeast wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Chance Rain Showers | 0 to 5 mph SE | 37% |
| Wednesday | 71°F | Partly Sunny | 0 to 5 mph SW | 8% |
| Wednesday Night | 49°F | Partly Cloudy | 0 to 5 mph S | 4% |
| Thursday | 70°F | Mostly Cloudy then Isolated Rain Showers | 5 to 10 mph SW | 17% |
| Thursday Night | 56°F | Mostly Cloudy | 0 to 10 mph SW | 10% |
| Friday | 66°F | Chance Light Rain | 0 mph | 52% |
| Friday Night | 50°F | Light Rain | 0 to 10 mph NE | 86% |
| Saturday | 57°F | Light Rain | 5 to 10 mph N | 81% |
| Saturday Night | 42°F | Light Rain Likely | 5 mph N | 60% |
| Sunday | 55°F | Chance Light Rain | 5 to 10 mph NW | 47% |
| Sunday Night | 35°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph W | 17% |
| Monday | 53°F | Partly Sunny then Slight Chance Light Rain | 5 to 10 mph W | 19% |
| Monday Night | 33°F | Slight Chance Light Rain | 5 to 10 mph W | 19% |
| Tuesday | 52°F | Slight Chance Light Rain then Mostly Sunny | 10 mph W | 18% |
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.