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.
Today
82°F
Mostly Sunny
Mostly sunny, with a high near 82. Northeast wind 2 to 6 mph.
7-day forecast for Mount Sinai
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Mostly Sunny | 2 to 6 mph NE | 0% |
| Tonight | 67°F | Mostly Cloudy | 5 mph E | 6% |
| Wednesday | 82°F | Partly Sunny | 2 to 6 mph SE | 8% |
| Wednesday Night | 72°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph S | 18% |
| Thursday | 87°F | Mostly Sunny | 5 to 12 mph SW | 11% |
| Thursday Night | 74°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 to 12 mph SW | 19% |
| Friday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 9 mph SW | 19% |
| Friday Night | 73°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 9 mph SW | 30% |
| Saturday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 8 mph SW | 23% |
| Saturday Night | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 8 mph SW | 25% |
| Sunday | 86°F | Mostly Sunny | 8 mph SW | 13% |
| Sunday Night | 73°F | Mostly Clear | 8 mph SW | 9% |
| Monday | 87°F | Sunny | 6 to 10 mph W | 8% |
| Monday Night | 72°F | Slight Chance Rain Showers | 7 to 10 mph W | 18% |
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 Aug 4, 2026.