Mountain Lake, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mountain Lake, a community in Warren County, New Jersey.
Tonight
56°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 1am. Mostly cloudy, with a low around 56. Southeast wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mountain Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Mostly Cloudy then Chance Rain Showers | 0 to 5 mph SE | 44% |
| Sunday | 70°F | Rain Showers | 0 to 5 mph SE | 95% |
| Sunday Night | 54°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 5 mph NW | 80% |
| Monday | 68°F | Partly Sunny then Slight Chance Rain Showers | 5 mph NE | 22% |
| Monday Night | 49°F | Chance Rain Showers | 5 mph NE | 30% |
| Tuesday | 62°F | Chance Rain Showers | 5 mph NE | 34% |
| Tuesday Night | 47°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 32% |
| Wednesday | 62°F | Slight Chance Rain Showers | 5 to 10 mph NE | 19% |
| Wednesday Night | 47°F | Slight Chance Rain Showers | 5 to 10 mph NE | 21% |
| Thursday | 60°F | Slight Chance Rain Showers | 5 to 10 mph NE | 24% |
| Thursday Night | 47°F | Chance Rain Showers | 5 to 10 mph NE | 29% |
| Friday | 64°F | Chance Rain Showers | 5 to 10 mph N | 32% |
| Friday Night | 48°F | Chance Rain Showers | 5 to 10 mph N | 32% |
| Saturday | 68°F | Chance Rain Showers | 5 to 10 mph N | 27% |
Forecast source: National Weather Service (api.weather.gov) for Mountain Lake (40.860, -74.988). Updated through the day.
Growing snapshot for Mountain Lake
Last spring frost
Apr 30
First fall frost
Oct 18
Growing season
168 days
Hardiness zone
6b
More local growing data for Mountain Lake: nearby ZIP 07844 weather · frost dates · planting calendar · New Jersey frost dates
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Climate data from the nearest NOAA station, Belvidere Brg, Nj (8.1 mi from Mountain Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.