Castine, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castine, a community in Hancock County, Maine.
This Afternoon
59°F
Sunny
Sunny, with a high near 59. West wind around 6 mph.
7-day forecast for Castine
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Sunny | 6 mph W | 0% |
| Tonight | 49°F | Partly Cloudy | 0 to 6 mph SW | 0% |
| Sunday | 57°F | Mostly Cloudy then Slight Chance Light Rain | 2 to 13 mph SE | 24% |
| Sunday Night | 51°F | Light Rain Likely | 2 to 8 mph E | 59% |
| Monday | 62°F | Patchy Fog then Sunny | 8 to 14 mph N | 3% |
| Monday Night | 45°F | Partly Cloudy | 8 to 12 mph N | 0% |
| Tuesday | 59°F | Mostly Sunny | 9 mph N | 0% |
| Tuesday Night | 45°F | Mostly Clear | 2 to 7 mph NE | 0% |
| Wednesday | 60°F | Sunny | 6 mph E | 0% |
| Wednesday Night | 44°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Thursday | 61°F | Mostly Sunny | 6 mph NE | 12% |
| Thursday Night | 48°F | Slight Chance Rain Showers | 2 to 8 mph NE | 18% |
| Friday | 60°F | Chance Rain Showers | 8 to 15 mph NE | 35% |
| Friday Night | 50°F | Chance Rain Showers | 15 to 20 mph NE | 41% |
Forecast source: National Weather Service (api.weather.gov) for Castine (44.394, -68.806). Updated through the day.
Growing snapshot for Castine
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5b
More local growing data for Castine: nearby ZIP 04421 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Belfast, Me (8.6 mi from Castine). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.