Castine, ME Weather & Growing Conditions
Today
62°F
Sunny
Sunny, with a high near 62. Northwest wind 5 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Sunny | 5 to 8 mph NW | 0% |
| Tonight | 49°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 59°F | Mostly Cloudy then Chance Rain Showers | 2 to 10 mph SE | 46% |
| Sunday Night | 47°F | Rain Showers Likely | 2 to 6 mph E | 74% |
| Monday | 62°F | Patchy Fog then Mostly Sunny | 7 to 10 mph N | 10% |
| Monday Night | 45°F | Partly Cloudy | 8 mph N | 0% |
| Tuesday | 62°F | Mostly Sunny | 5 to 8 mph N | 0% |
| Tuesday Night | 45°F | Partly Cloudy | 2 to 6 mph NE | 0% |
| Wednesday | 61°F | Sunny | 6 mph E | 0% |
| Wednesday Night | 45°F | Partly Cloudy | 0 to 5 mph E | 1% |
| Thursday | 61°F | Mostly Sunny then Slight Chance Rain Showers | 3 to 7 mph NE | 19% |
| Thursday Night | 47°F | Chance Rain Showers | 3 to 10 mph NE | 30% |
| Friday | 62°F | Chance Rain Showers | 10 to 14 mph NE | 29% |
| Friday Night | 48°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
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 Sep 19, 2026.