Castine, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castine, a community in Hancock County, Maine.
Tonight
50°F
Chance Light Rain
A chance of rain before 10pm, then a chance of rain and patchy fog between 10pm and 3am, then patchy fog and a slight chance of rain. Cloudy, with a low around 50. Southeast wind 2 to 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Castine
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Chance Light Rain | 2 to 8 mph SE | 51% |
| Wednesday | 60°F | Patchy Fog then Partly Sunny | 2 to 7 mph S | 10% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph S | 4% |
| Thursday | 60°F | Partly Sunny then Slight Chance Light Rain | 7 to 14 mph S | 20% |
| Thursday Night | 56°F | Slight Chance Light Rain | 5 to 12 mph SW | 21% |
| Friday | 61°F | Light Rain Likely | 6 mph S | 66% |
| Friday Night | 52°F | Light Rain | 3 to 9 mph E | 85% |
| Saturday | 55°F | Light Rain | 12 mph E | 84% |
| Saturday Night | 48°F | Light Rain Likely | 10 mph N | 72% |
| Sunday | 54°F | Chance Light Rain | 7 to 10 mph NW | 51% |
| Sunday Night | 43°F | Chance Light Rain then Mostly Cloudy | 8 mph W | 28% |
| Monday | 52°F | Slight Chance Light Rain | 7 to 12 mph NW | 23% |
| Monday Night | 41°F | Slight Chance Light Rain | 10 mph NW | 24% |
| Tuesday | 51°F | Slight Chance Light Rain | 10 to 15 mph W | 23% |
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 Nov 4, 2026.