Castine, ME Weather & Growing Conditions
Today
72°F
Sunny
Sunny, with a high near 72. Southwest wind around 14 mph, with gusts as high as 26 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Sunny | 14 mph SW | 0% |
| Tonight | 61°F | Mostly Clear | 2 to 14 mph SW | 0% |
| Wednesday | 70°F | Mostly Sunny | 1 to 10 mph SW | 0% |
| Wednesday Night | 60°F | Partly Cloudy then Patchy Fog | 1 to 10 mph SW | 3% |
| Thursday | 71°F | Patchy Fog then Mostly Sunny | 1 to 9 mph SW | 3% |
| Thursday Night | 62°F | Partly Cloudy then Patchy Fog | 1 to 9 mph SW | 5% |
| Friday | 73°F | Patchy Fog then Mostly Sunny | 1 to 10 mph S | 7% |
| Friday Night | 64°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 9 mph W | 23% |
| Saturday | 72°F | Slight Chance Showers And Thunderstorms | 2 to 9 mph SW | 23% |
| Saturday Night | 63°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 9 mph SW | 22% |
| Sunday | 72°F | Mostly Sunny | 1 to 12 mph SW | 6% |
| Sunday Night | 64°F | Partly Cloudy | 5 to 12 mph SW | 6% |
| Monday | 74°F | Mostly Sunny | 5 to 13 mph SW | 11% |
| Monday Night | 63°F | Slight Chance Rain Showers | 6 to 12 mph W | 18% |
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 (13.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.