Newcastle, ME Weather & Growing Conditions
Tonight
43°F
Mostly Clear
Mostly clear, with a low around 43. Northwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 43°F | Mostly Clear | 5 mph NW | 0% |
| Saturday | 66°F | Sunny | 5 to 10 mph NW | 0% |
| Saturday Night | 43°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 64°F | Chance Rain Showers | 0 to 10 mph S | 32% |
| Sunday Night | 46°F | Chance Rain Showers | 0 to 5 mph W | 48% |
| Monday | 67°F | Mostly Sunny | 5 to 10 mph N | 7% |
| Monday Night | 43°F | Partly Cloudy | 5 mph N | 0% |
| Tuesday | 64°F | Mostly Sunny | 5 to 10 mph NE | 0% |
| Tuesday Night | 43°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph NE | 1% |
| Wednesday Night | 43°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Thursday | 65°F | Partly Sunny then Slight Chance Rain Showers | 0 to 5 mph NE | 22% |
| Thursday Night | 45°F | Chance Rain Showers | 0 to 10 mph NE | 26% |
| Friday | 66°F | Chance Rain Showers | 5 to 10 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Newcastle, ME
Last spring frost
Apr 27
First fall frost
Oct 18
Growing season
172 days
Hardiness zone
5b
Explore more for Newcastle, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Newcastle, Me (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.