Smithtown, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithtown, a community in Suffolk County, New York.
Tonight
52°F
Patchy Fog
Patchy fog after 11pm. Partly cloudy, with a low around 52. Southwest wind around 5 mph.
7-day forecast for Smithtown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Patchy Fog | 5 mph SW | 3% |
| Wednesday | 71°F | Patchy Fog then Sunny | 3 to 10 mph SW | 3% |
| Wednesday Night | 58°F | Partly Cloudy | 5 to 8 mph S | 2% |
| Thursday | 70°F | Slight Chance Rain Showers | 5 to 10 mph S | 20% |
| Thursday Night | 60°F | Rain Showers | 8 mph SW | 83% |
| Friday | 67°F | Showers And Thunderstorms | 6 mph S | 91% |
| Friday Night | 54°F | Showers And Thunderstorms | 5 mph W | 91% |
| Saturday | 65°F | Rain Showers Likely | 8 mph NW | 59% |
| Saturday Night | 44°F | Slight Chance Rain Showers | 8 mph NW | 20% |
| Sunday | 59°F | Slight Chance Rain Showers then Mostly Sunny | 8 mph W | 18% |
| Sunday Night | 41°F | Partly Cloudy | 8 mph W | 14% |
| Monday | 58°F | Chance Light Rain | 9 to 14 mph NW | 25% |
| Monday Night | 41°F | Chance Light Rain | 10 mph W | 25% |
| Tuesday | 59°F | Slight Chance Light Rain then Mostly Sunny | 12 to 15 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
Nearby towns & communities
Amagansett
Amityville
Aquebogue
Asharoken
Babylon
Baiting Hollow
Bay Shore
Bayport
Baywood
Belle Terre
Bellport
Blue Point
Bohemia
Brentwood
Bridgehampton
Brightwaters
Brookhaven
Calverton
Captree
Center Moriches
Centereach
Centerport
Central Islip
Cold Spring Harbor
Commack
Copiague
Coram
Cutchogue
Deer Park
Dering Harbor
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 Nov 4, 2026.