Winthrop, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a community in Kennebec County, Maine.
Today
83°F
Sunny
Sunny, with a high near 83. West wind 5 to 15 mph, with gusts as high as 25 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 5 to 15 mph W | 0% |
| Tonight | 60°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Wednesday | 86°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 64°F | Partly Cloudy | 0 to 5 mph SW | 3% |
| Thursday | 88°F | Mostly Sunny | 0 to 5 mph S | 7% |
| Thursday Night | 68°F | Partly Cloudy | 0 to 5 mph SW | 7% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 26% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 26% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 40% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 35% |
| Sunday | 88°F | Sunny | 0 to 5 mph W | 5% |
| Sunday Night | 67°F | Mostly Clear | 0 to 5 mph SW | 9% |
| Monday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph W | 15% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms | 5 to 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 Aug 4, 2026.