Oswego, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a community in Sumter County, South Carolina.
This Afternoon
82°F
Mostly Sunny
Mostly sunny, with a high near 82. East wind around 9 mph.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Mostly Sunny | 9 mph E | 0% |
| Tonight | 57°F | Mostly Clear then Patchy Fog | 3 to 8 mph E | 1% |
| Wednesday | 83°F | Patchy Fog then Partly Sunny | 3 to 10 mph SE | 4% |
| Wednesday Night | 63°F | Mostly Cloudy then Chance Light Rain | 1 to 8 mph SE | 25% |
| Thursday | 83°F | Slight Chance Light Rain then Chance Showers And Thunderstorms | 1 to 6 mph S | 40% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph S | 40% |
| Friday | 80°F | Showers And Thunderstorms Likely | 2 to 7 mph SW | 72% |
| Friday Night | 55°F | Chance T-storms | 3 mph NW | 26% |
| Saturday | 76°F | Mostly Sunny | 6 mph N | 9% |
| Saturday Night | 47°F | Partly Cloudy | 3 mph N | 5% |
| Sunday | 71°F | Mostly Sunny | 5 mph N | 6% |
| Sunday Night | 44°F | Partly Cloudy | 2 mph W | 13% |
| Monday | 69°F | Sunny | 3 to 8 mph NW | 13% |
| Monday Night | 40°F | Slight Chance Light Rain | 5 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Oswego (34.006, -80.286). Updated through the day.
Growing snapshot for Oswego
Last spring frost
Mar 24
First fall frost
Nov 7
Growing season
230 days
Hardiness zone
8b
More local growing data for Oswego: nearby ZIP 29153 weather · frost dates · planting calendar · South Carolina frost dates
Nearby towns & communities
Boykin
Cane Savannah
Cherryvale
Dalzell
East Sumter
Lakewood
Mulberry
Oakland
Paxville
Pinewood
Privateer
Rembert
South Sumter
Stateburg
Sumter
Wedgefield
All South Carolina locations ›
Climate data from the nearest NOAA station, Sumter, Sc (3.8 mi from Oswego). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.