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
95°F
Sunny
Sunny, with a high near 95. Heat index values as high as 102. Southwest wind around 3 mph.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 95°F | Sunny | 3 mph SW | 12% |
| Tonight | 71°F | Chance Showers And Thunderstorms | 2 mph NW | 30% |
| Saturday | 92°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 5 mph NE | 40% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph NE | 33% |
| Sunday | 91°F | Partly Sunny then Chance Showers And Thunderstorms | 2 mph NE | 28% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph E | 28% |
| Monday | 92°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph E | 39% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 0 to 3 mph E | 40% |
| Tuesday | 88°F | Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 7 mph NE | 54% |
| Tuesday Night | 69°F | Chance Showers And Thunderstorms | 3 to 8 mph NE | 54% |
| Wednesday | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 8 to 13 mph NE | 31% |
| Wednesday Night | 65°F | Chance Showers And Thunderstorms then Partly Cloudy | 8 to 13 mph NE | 31% |
| Thursday | 82°F | Mostly Sunny | 12 mph NE | 13% |
| Thursday Night | 63°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 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
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Dalzell
East Sumter
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Paxville
Pinewood
Privateer
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South Sumter
Stateburg
Sumter
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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 Sep 18, 2026.