Newcastle, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Newcastle, a community in Lincoln County, Maine.
Tonight
47°F
Slight Chance Rain Showers then Cloudy
A slight chance of rain showers before midnight. Cloudy, with a low around 47. South wind around 0 mph. Chance of precipitation is 20%.
7-day forecast for Newcastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Slight Chance Rain Showers then Cloudy | 0 mph | 19% |
| Wednesday | 70°F | Partly Sunny | 0 to 5 mph SW | 7% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph SW | 4% |
| Thursday | 68°F | Partly Sunny then Isolated Rain Showers | 5 to 10 mph SW | 16% |
| Thursday Night | 57°F | Mostly Cloudy then Isolated Rain Showers | 0 to 10 mph SW | 16% |
| Friday | 68°F | Light Rain Likely | 0 to 5 mph S | 64% |
| Friday Night | 51°F | Light Rain | 0 to 5 mph E | 85% |
| Saturday | 60°F | Light Rain | 5 to 10 mph NE | 81% |
| Saturday Night | 42°F | Light Rain Likely | 0 to 5 mph NW | 62% |
| Sunday | 58°F | Chance Light Rain | 5 to 10 mph NW | 42% |
| Sunday Night | 35°F | Slight Chance Light Rain then Mostly Cloudy | 0 to 5 mph W | 19% |
| Monday | 56°F | Partly Sunny then Slight Chance Light Rain | 0 to 10 mph NW | 19% |
| Monday Night | 32°F | Slight Chance Light Rain | 5 mph NW | 20% |
| Tuesday | 55°F | Slight Chance Light Rain | 5 to 15 mph W | 19% |
Forecast source: National Weather Service (api.weather.gov) for Newcastle (44.049, -69.533). Updated through the day.
Growing snapshot for Newcastle
Last spring frost
Apr 27
First fall frost
Oct 18
Growing season
172 days
Hardiness zone
5b
More local growing data for Newcastle: nearby ZIP 04553 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Newcastle, Me (1.6 mi from Newcastle). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.