Great River, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Great River, a community in Suffolk County, New York.
This Afternoon
70°F
Mostly Sunny
Mostly sunny. High near 70, with temperatures falling to around 67 in the afternoon. East wind around 12 mph.
7-day forecast for Great River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Mostly Sunny | 12 mph E | 0% |
| Tonight | 57°F | Mostly Cloudy | 7 to 10 mph SE | 2% |
| Sunday | 71°F | Rain | 7 to 13 mph SE | 76% |
| Sunday Night | 57°F | Rain | 7 to 13 mph NE | 87% |
| Monday | 68°F | Chance Light Rain | 12 to 16 mph NE | 47% |
| Monday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 9 to 16 mph NE | 20% |
| Tuesday | 65°F | Chance Rain Showers | 18 mph NE | 26% |
| Tuesday Night | 54°F | Chance Rain Showers | 17 to 22 mph NE | 26% |
| Wednesday | 65°F | Slight Chance Rain Showers | 24 mph NE | 21% |
| Wednesday Night | 54°F | Chance Rain Showers | 24 mph NE | 33% |
| Thursday | 65°F | Chance Rain Showers | 25 mph NE | 34% |
| Thursday Night | 54°F | Chance Rain Showers | 23 mph NE | 40% |
| Friday | 66°F | Chance Rain Showers | 22 mph N | 38% |
| Friday Night | 54°F | Chance Rain Showers | 23 mph N | 38% |
Forecast source: National Weather Service (api.weather.gov) for Great River (40.713, -73.176). Updated through the day.
Growing snapshot for Great River
Last spring frost
Apr 4
First fall frost
Nov 11
Growing season
219 days
Hardiness zone
7b
More local growing data for Great River: nearby ZIP 11739 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Molloy Cercom, Ny (4 mi from Great River). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.