Castine, ME Weather & Growing Conditions
This Afternoon
55°F
Chance Light Rain
A chance of rain. Cloudy, with a high near 55. East wind around 3 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 55°F | Chance Light Rain | 3 mph E | 33% |
| Tonight | 51°F | Chance Light Rain | 3 to 8 mph SE | 48% |
| Wednesday | 58°F | Patchy Fog then Partly Sunny | 2 to 9 mph SW | 9% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 7 mph SW | 4% |
| Thursday | 59°F | Partly Sunny then Slight Chance Light Rain | 8 to 15 mph SW | 18% |
| Thursday Night | 56°F | Slight Chance Light Rain | 7 to 14 mph SW | 23% |
| Friday | 59°F | Light Rain Likely | 7 mph S | 70% |
| Friday Night | 51°F | Light Rain | 3 to 9 mph SE | 86% |
| Saturday | 56°F | Light Rain | 13 mph E | 85% |
| Saturday Night | 47°F | Light Rain Likely | 10 mph N | 73% |
| Sunday | 55°F | Chance Light Rain | 7 to 10 mph NW | 51% |
| Sunday Night | 42°F | Chance Light Rain then Mostly Cloudy | 8 mph NW | 27% |
| Monday | 52°F | Slight Chance Light Rain | 7 to 12 mph NW | 23% |
| Monday Night | 40°F | Slight Chance Light Rain | 12 mph NW | 24% |
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 Nov 4, 2026.