Mount Sinai, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Sinai, a community in Suffolk County, New York.
Tonight
58°F
Mostly Cloudy
Mostly cloudy, with a low around 58. Southeast wind around 7 mph.
7-day forecast for Mount Sinai
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Mostly Cloudy | 7 mph SE | 1% |
| Sunday | 71°F | Rain Showers then Rain | 7 to 12 mph SE | 84% |
| Sunday Night | 58°F | Rain then Rain Showers | 7 to 15 mph W | 84% |
| Monday | 68°F | Chance Rain Showers | 9 to 15 mph NE | 37% |
| Monday Night | 56°F | Chance Rain Showers | 9 to 14 mph NE | 26% |
| Tuesday | 65°F | Chance Rain Showers | 15 mph NE | 26% |
| Tuesday Night | 56°F | Slight Chance Rain Showers then Mostly Cloudy | 14 to 21 mph NE | 23% |
| Wednesday | 65°F | Mostly Cloudy | 23 mph NE | 12% |
| Wednesday Night | 56°F | Slight Chance Rain Showers | 21 to 24 mph NE | 23% |
| Thursday | 65°F | Chance Rain Showers | 21 to 24 mph NE | 33% |
| Thursday Night | 55°F | Chance Rain Showers | 21 to 25 mph NE | 39% |
| Friday | 65°F | Chance Rain Showers | 24 mph N | 43% |
| Friday Night | 57°F | Chance Rain Showers | 23 mph N | 43% |
| Saturday | 67°F | Chance Rain Showers | 16 to 23 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov) for Mount Sinai (40.942, -73.020). Updated through the day.
Growing snapshot for Mount Sinai
Last spring frost
Apr 4
First fall frost
Nov 7
Growing season
215 days
Hardiness zone
7b
More local growing data for Mount Sinai: nearby ZIP 11766 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Mt Sinai, Ny (0.4 mi from Mount Sinai). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.