Castine, ME Weather & Growing Conditions
Today
64°F
Sunny
Sunny, with a high near 64. Northwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Sunny | 5 to 10 mph NW | 0% |
| Tonight | 46°F | Partly Cloudy | 0 to 3 mph S | 0% |
| Sunday | 60°F | Mostly Cloudy then Chance Rain Showers | 1 to 10 mph SE | 43% |
| Sunday Night | 44°F | Rain Showers Likely | 1 to 6 mph E | 74% |
| Monday | 63°F | Patchy Fog then Mostly Sunny | 7 to 10 mph N | 10% |
| Monday Night | 44°F | Partly Cloudy | 5 to 8 mph N | 0% |
| Tuesday | 64°F | Mostly Sunny | 8 mph N | 0% |
| Tuesday Night | 44°F | Partly Cloudy | 2 to 6 mph NE | 0% |
| Wednesday | 62°F | Sunny | 6 mph E | 0% |
| Wednesday Night | 44°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 62°F | Mostly Sunny then Slight Chance Rain Showers | 2 to 7 mph NE | 19% |
| Thursday Night | 45°F | Chance Rain Showers | 2 to 12 mph NE | 30% |
| Friday | 63°F | Chance Rain Showers | 14 mph NE | 29% |
| Friday Night | 46°F | Chance Rain Showers | 13 to 17 mph NE | 30% |
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
5b
Explore more for Castine, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Belfast, Me (13.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.