Smithtown, NY Weather & Growing Conditions
Tonight
52°F
Patchy Fog
Patchy fog after 11pm. Partly cloudy, with a low around 52. Southwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Patchy Fog | 3 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). Updated through the day.
Growing snapshot for Smithtown, NY
Last spring frost
Apr 10
First fall frost
Nov 2
Growing season
207 days
Hardiness zone
7b
Explore more for Smithtown, NY: full frost dates · planting calendar · New York frost dates
Climate data from the nearest NOAA station, Islip Li Macarthur Ap, Ny (7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.