Altmar, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altmar, a community in Oswego County, New York.
Tonight
43°F
Mostly Cloudy
Mostly cloudy, with a low around 43. North wind around 5 mph.
7-day forecast for Altmar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 43°F | Mostly Cloudy | 5 mph N | 1% |
| Saturday | 66°F | Mostly Sunny | 2 mph E | 0% |
| Saturday Night | 48°F | Mostly Cloudy then Chance Rain Showers | 1 to 6 mph E | 42% |
| Sunday | 62°F | Rain Showers | 7 mph E | 87% |
| Sunday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 6 mph N | 35% |
| Monday | 63°F | Mostly Sunny | 7 mph NE | 0% |
| Monday Night | 44°F | Mostly Cloudy | 3 to 8 mph NE | 3% |
| Tuesday | 64°F | Mostly Cloudy | 5 mph E | 8% |
| Tuesday Night | 44°F | Mostly Cloudy | 6 mph E | 8% |
| Wednesday | 62°F | Partly Sunny | 8 mph E | 13% |
| Wednesday Night | 45°F | Chance Rain Showers | 7 mph E | 27% |
| Thursday | 63°F | Chance Rain Showers | 7 mph E | 31% |
| Thursday Night | 46°F | Chance Showers And Thunderstorms | 6 mph NE | 31% |
| Friday | 67°F | Slight Chance Rain Showers then Partly Sunny | 6 mph N | 23% |
Forecast source: National Weather Service (api.weather.gov) for Altmar (43.512, -76.006). Updated through the day.
Growing snapshot for Altmar
Last spring frost
May 10
First fall frost
Oct 14
Growing season
156 days
Hardiness zone
5b
More local growing data for Altmar: nearby ZIP 13302 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
Central Square
Constantia
Fulton
Hannibal
Lacona
Mexico
Minetto
Oswego
Parish
Phoenix
Pulaski
Sand Ridge
Sandy Creek
SUNY Oswego
Climate data from the nearest NOAA station, Pulaski, Ny (9 mi from Altmar). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.