Castine, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castine, a community in Hancock County, Maine.
Today
78°F
Sunny
Sunny, with a high near 78. West wind 12 to 15 mph, with gusts as high as 28 mph.
7-day forecast for Castine
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Sunny | 12 to 15 mph W | 0% |
| Tonight | 60°F | Mostly Clear | 0 to 12 mph W | 0% |
| Wednesday | 76°F | Mostly Sunny | 0 to 12 mph SW | 0% |
| Wednesday Night | 61°F | Partly Cloudy then Patchy Fog | 0 to 10 mph SW | 3% |
| Thursday | 77°F | Patchy Fog then Mostly Sunny | 0 to 9 mph W | 3% |
| Thursday Night | 64°F | Partly Cloudy then Patchy Fog | 0 to 8 mph SW | 4% |
| Friday | 79°F | Patchy Fog then Mostly Sunny | 0 to 10 mph SW | 12% |
| Friday Night | 65°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 1 to 8 mph W | 24% |
| Saturday | 78°F | Slight Chance Showers And Thunderstorms | 1 to 9 mph W | 28% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 8 mph SW | 26% |
| Sunday | 76°F | Mostly Sunny | 0 to 10 mph SW | 8% |
| Sunday Night | 65°F | Mostly Clear | 2 to 10 mph SW | 7% |
| Monday | 78°F | Mostly Sunny | 2 to 14 mph SW | 14% |
| Monday Night | 63°F | Slight Chance Rain Showers | 5 to 12 mph W | 19% |
Forecast source: National Weather Service (api.weather.gov) for Castine (44.394, -68.806). Updated through the day.
Growing snapshot for Castine
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5b
More local growing data for Castine: nearby ZIP 04421 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Belfast, Me (8.6 mi from Castine). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.