Smithtown, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithtown, a community in Suffolk County, New York.
Tonight
56°F
Partly Cloudy
Partly cloudy, with a low around 56. North wind 7 to 12 mph.
7-day forecast for Smithtown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Partly Cloudy | 7 to 12 mph N | 0% |
| Saturday | 69°F | Mostly Sunny | 8 to 13 mph E | 0% |
| Saturday Night | 56°F | Mostly Cloudy | 5 to 8 mph SE | 4% |
| Sunday | 71°F | Showers And Thunderstorms | 6 to 15 mph SE | 81% |
| Sunday Night | 59°F | Showers And Thunderstorms | 7 to 13 mph SW | 90% |
| Monday | 68°F | Rain Showers Likely | 12 to 15 mph NE | 59% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 27% |
| Tuesday | 65°F | Chance Rain Showers | 17 mph NE | 27% |
| Tuesday Night | 53°F | Chance Rain Showers then Mostly Cloudy | 17 mph NE | 27% |
| Wednesday | 65°F | Mostly Cloudy then Slight Chance Rain Showers | 20 mph NE | 15% |
| Wednesday Night | 53°F | Chance Rain Showers | 18 mph NE | 36% |
| Thursday | 65°F | Chance Rain Showers | 20 mph NE | 36% |
| Thursday Night | 53°F | Chance Rain Showers | 14 to 18 mph NE | 36% |
| Friday | 68°F | Chance Rain Showers | 16 mph N | 36% |
Forecast source: National Weather Service (api.weather.gov) for Smithtown (40.857, -73.217). Updated through the day.
Growing snapshot for Smithtown
Last spring frost
Apr 10
First fall frost
Nov 2
Growing season
207 days
Hardiness zone
7b
More local growing data for Smithtown: nearby ZIP 11787 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Islip Li Macarthur Ap, Ny (7 mi from Smithtown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.