Castine, ME Weather & Growing Conditions
Today
57°F
Sunny
Sunny, with a high near 57. Northwest wind 6 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 57°F | Sunny | 6 to 9 mph NW | 0% |
| Tonight | 51°F | Partly Cloudy | 1 to 6 mph S | 0% |
| Sunday | 56°F | Mostly Cloudy then Chance Rain Showers | 2 to 12 mph SE | 43% |
| Sunday Night | 49°F | Rain Showers Likely | 2 to 7 mph E | 74% |
| Monday | 60°F | Patchy Fog then Mostly Sunny | 8 to 12 mph N | 10% |
| Monday Night | 46°F | Partly Cloudy | 9 mph N | 0% |
| Tuesday | 57°F | Mostly Sunny | 5 to 9 mph N | 0% |
| Tuesday Night | 46°F | Partly Cloudy | 2 to 7 mph NE | 0% |
| Wednesday | 60°F | Sunny | 7 mph E | 0% |
| Wednesday Night | 45°F | Partly Cloudy | 1 to 5 mph NE | 1% |
| Thursday | 59°F | Mostly Sunny then Slight Chance Rain Showers | 3 to 7 mph NE | 20% |
| Thursday Night | 47°F | Chance Rain Showers | 3 to 12 mph NE | 31% |
| Friday | 61°F | Chance Rain Showers | 14 mph NE | 30% |
| Friday Night | 48°F | Chance Rain Showers | 14 to 18 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 (15.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.