Castine, ME Weather & Growing Conditions
Today
59°F
Partly Sunny
Partly sunny, with a high near 59. Southwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Partly Sunny | 10 mph SW | 3% |
| Tonight | 53°F | Partly Cloudy | 7 to 10 mph SW | 3% |
| Thursday | 59°F | Mostly Cloudy | 12 to 17 mph SW | 14% |
| Thursday Night | 54°F | Chance Light Rain | 9 to 16 mph SW | 36% |
| Friday | 58°F | Light Rain Likely | 5 to 8 mph S | 68% |
| Friday Night | 52°F | Rain | 3 to 12 mph SE | 96% |
| Saturday | 56°F | Light Rain | 13 mph SE | 88% |
| Saturday Night | 47°F | Light Rain Likely | 9 to 13 mph NE | 59% |
| Sunday | 54°F | Chance Light Rain | 13 mph NW | 49% |
| Sunday Night | 44°F | Slight Chance Light Rain then Partly Cloudy | 6 to 9 mph W | 18% |
| Monday | 52°F | Chance Light Rain | 9 to 14 mph W | 27% |
| Monday Night | 41°F | Slight Chance Light Rain | 14 mph W | 24% |
| Tuesday | 51°F | Mostly Sunny | 14 mph W | 13% |
| Tuesday Night | 41°F | Partly Cloudy | 14 mph W | 13% |
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 (15 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.