Castine, ME Weather & Growing Conditions
This Afternoon
58°F
Chance Light Rain
A chance of rain. Cloudy, with a high near 58. East wind around 3 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 58°F | Chance Light Rain | 3 mph E | 38% |
| Tonight | 49°F | Chance Light Rain | 1 to 6 mph SE | 52% |
| Wednesday | 63°F | Patchy Fog then Partly Sunny | 1 to 7 mph S | 10% |
| Wednesday Night | 51°F | Partly Cloudy | 1 to 5 mph S | 4% |
| Thursday | 64°F | Partly Sunny then Slight Chance Light Rain | 5 to 13 mph S | 20% |
| Thursday Night | 57°F | Slight Chance Light Rain | 5 to 10 mph SW | 21% |
| Friday | 64°F | Light Rain Likely | 6 mph S | 65% |
| Friday Night | 52°F | Light Rain | 3 to 8 mph E | 85% |
| Saturday | 56°F | Light Rain | 12 mph E | 84% |
| Saturday Night | 47°F | Light Rain Likely | 9 mph N | 72% |
| Sunday | 55°F | Chance Light Rain | 9 mph NW | 51% |
| Sunday Night | 42°F | Chance Light Rain then Mostly Cloudy | 7 mph W | 28% |
| Monday | 53°F | Slight Chance Light Rain | 5 to 10 mph NW | 23% |
| Monday Night | 39°F | Slight Chance Light Rain | 9 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
5b
Explore more for Castine, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Belfast, Me (8.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.