Oswego, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oswego, a community in Sumter County, South Carolina.
Today
88°F
Patchy Fog then Chance Showers And Thunderstorms
Patchy fog and a chance of showers and thunderstorms before 11am, then a chance of showers and thunderstorms between 11am and 4pm, then showers and thunderstorms likely. Partly sunny, with a high near 88. Southeast wind 0 to 3 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 3 mph SE | 65% |
| Tonight | 71°F | Showers And Thunderstorms Likely then Partly Cloudy | 2 mph NE | 73% |
| Wednesday | 89°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 6 mph S | 54% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 35% |
| Thursday | 91°F | Partly Sunny then Showers And Thunderstorms Likely | 1 to 6 mph S | 70% |
| Thursday Night | 72°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 3 mph S | 70% |
| Friday | 92°F | Chance Showers And Thunderstorms | 0 to 6 mph S | 37% |
| Friday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph E | 37% |
| Saturday | 91°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SE | 33% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 33% |
| Sunday | 92°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 3 mph SW | 38% |
| Sunday Night | 73°F | Chance Showers And Thunderstorms | 3 mph S | 38% |
| Monday | 93°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 5 mph SW | 32% |
| Monday Night | 74°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SW | 32% |
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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South Sumter
Stateburg
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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 Aug 4, 2026.