Lake Ronkonkoma, NY Weather & Growing Conditions
This Afternoon
69°F
Mostly Sunny
Mostly sunny. High near 69, with temperatures falling to around 62 in the afternoon. South wind 6 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Mostly Sunny | 6 to 10 mph S | 0% |
| Tonight | 51°F | Partly Cloudy | 2 to 6 mph SW | 0% |
| Wednesday | 72°F | Mostly Sunny | 5 to 10 mph SW | 0% |
| Wednesday Night | 56°F | Mostly Cloudy | 8 mph SW | 0% |
| Thursday | 71°F | Mostly Cloudy then Slight Chance Rain Showers | 7 to 14 mph S | 21% |
| Thursday Night | 59°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 7 to 10 mph SW | 64% |
| Friday | 69°F | Showers And Thunderstorms | 7 to 10 mph S | 79% |
| Friday Night | 52°F | Showers And Thunderstorms then Light Rain | 9 mph W | 79% |
| Saturday | 64°F | Light Rain Likely | 9 mph N | 66% |
| Saturday Night | 45°F | Chance Light Rain | 10 mph NW | 28% |
| Sunday | 60°F | Slight Chance Light Rain then Mostly Sunny | 10 mph NW | 16% |
| Sunday Night | 43°F | Partly Cloudy then Slight Chance Light Rain | 3 to 9 mph NW | 19% |
| Monday | 59°F | Chance Light Rain | 10 to 15 mph NW | 31% |
| Monday Night | 41°F | Chance Light Rain | 12 to 17 mph NW | 31% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lake Ronkonkoma, NY
Last spring frost
Apr 10
First fall frost
Nov 2
Growing season
207 days
Hardiness zone
7b
Explore more for Lake Ronkonkoma, NY: full frost dates · planting calendar · New York frost dates
Climate data from the nearest NOAA station, Islip Li Macarthur Ap, Ny (1.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.