Castine, ME Weather & Growing Conditions
Today
85°F
Sunny
Sunny, with a high near 85. West wind 10 to 14 mph, with gusts as high as 26 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 10 to 14 mph W | 0% |
| Tonight | 62°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Wednesday | 83°F | Mostly Sunny | 0 to 9 mph SW | 0% |
| Wednesday Night | 63°F | Partly Cloudy then Patchy Fog | 0 to 8 mph SW | 3% |
| Thursday | 80°F | Patchy Fog then Mostly Sunny | 0 to 8 mph W | 3% |
| Thursday Night | 66°F | Partly Cloudy then Patchy Fog | 0 to 7 mph SW | 4% |
| Friday | 82°F | Patchy Fog then Mostly Sunny | 0 to 8 mph SW | 11% |
| Friday Night | 66°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 1 to 7 mph W | 24% |
| Saturday | 80°F | Slight Chance Showers And Thunderstorms | 1 to 8 mph W | 27% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 7 mph W | 25% |
| Sunday | 79°F | Mostly Sunny | 0 to 10 mph W | 7% |
| Sunday Night | 66°F | Partly Cloudy | 2 to 9 mph SW | 7% |
| Monday | 81°F | Mostly Sunny | 2 to 12 mph SW | 13% |
| Monday Night | 64°F | Slight Chance Rain Showers | 5 to 10 mph W | 19% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castine, ME
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
Explore more for Castine, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Belfast, Me (9.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.