Smithtown, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithtown, a community in Suffolk County, New York.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Northeast wind around 6 mph.
7-day forecast for Smithtown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 6 mph NE | 0% |
| Tonight | 65°F | Mostly Cloudy | 5 mph NE | 6% |
| Wednesday | 83°F | Partly Sunny | 2 to 7 mph SE | 12% |
| Wednesday Night | 71°F | Mostly Cloudy then Slight Chance Rain Showers | 7 mph S | 19% |
| Thursday | 88°F | Mostly Sunny | 5 to 10 mph SW | 13% |
| Thursday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph SW | 21% |
| Friday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 9 mph SW | 24% |
| Friday Night | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 to 9 mph SW | 34% |
| Saturday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 9 mph SW | 25% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 29% |
| Sunday | 89°F | Mostly Sunny | 5 to 8 mph SW | 13% |
| Sunday Night | 72°F | Mostly Clear | 7 mph SW | 10% |
| Monday | 89°F | Sunny | 5 to 10 mph W | 9% |
| Monday Night | 72°F | Slight Chance Rain Showers | 5 to 9 mph W | 19% |
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 Aug 4, 2026.