South Carolina · NWS CAE office

Sumter, SC weather

It is 51°F and clear at Shaw Air Force Base as of Oct 28, 7:55 AM EDT. Today: Partly Sunny, high near 77°F, 2% chance of precipitation. Forecast from the National Weather Service, issued Oct 28, 6:51 AM EDT.

Updated Oct 28, 8:24 AM EDT (snapshot)

Current conditions

Temperature

51°F

Clear

Wind

NNE 6 mph

Humidity 91% · dew point 48°F

Pressure · visibility

30.28 inHg

Visibility 10 mi

Observed at Shaw Air Force Base (KSSC), Oct 28, 7:55 AM EDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Sumter forecast zone right now.

Around the NWS CAE forecast area

No active alerts in zones served by the CAE office near Sumter.

From the alert snapshot of Oct 28, 2026, 8:14 AM EDT. South Carolina has 7 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Sumter (local time)
TimeTempForecastPrecip. chanceWind
Wed 8 AM49°FPartly Sunny0%NE 7 mph
Wed 9 AM55°FMostly Sunny2%NE 8 mph
Wed 10 AM60°FPartly Sunny1%NE 8 mph
Wed 11 AM65°FPartly Sunny0%NE 9 mph
Wed 12 PM69°FPartly Sunny0%NE 9 mph
Wed 1 PM73°FMostly Cloudy0%NE 10 mph
Wed 2 PM75°FPartly Sunny0%NE 10 mph
Wed 3 PM75°FMostly Cloudy0%NE 12 mph
Wed 4 PM77°FMostly Cloudy0%NE 12 mph
Wed 5 PM75°FPartly Sunny0%NE 10 mph
Wed 6 PM75°FMostly Cloudy0%NE 8 mph
Wed 7 PM72°FMostly Cloudy0%NE 7 mph
Wed 8 PM67°FMostly Cloudy0%NE 7 mph
Wed 9 PM65°FMostly Cloudy1%NE 7 mph
Wed 10 PM64°FMostly Cloudy3%NE 6 mph
Wed 11 PM63°FMostly Cloudy1%NE 6 mph
Thu 12 AM61°FMostly Cloudy1%NE 6 mph
Thu 1 AM61°FPartly Cloudy1%NE 5 mph
Thu 2 AM60°FMostly Cloudy0%NE 6 mph
Thu 3 AM60°FPartly Cloudy1%NE 6 mph
Thu 4 AM60°FMostly Cloudy2%NE 7 mph
Thu 5 AM60°FMostly Cloudy2%NE 7 mph
Thu 6 AM60°FPartly Sunny2%NE 7 mph
Thu 7 AM58°FMostly Cloudy0%NE 7 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Sumter can differ.

7-day forecast

Today

High 77°F·Low 58°F

Partly sunny, with a high near 77. Northeast wind 7 to 12 mph.

Tonight: Mostly cloudy, with a low around 58. Northeast wind 5 to 8 mph.

Thursday

High 80°F·Low 55°F

Mostly sunny, with a high near 80. Northeast wind around 9 mph.

Thursday Night: Mostly clear, with a low around 55. North wind around 5 mph.

Friday

High 81°F·Low 56°F

Sunny, with a high near 81. Northeast wind 2 to 6 mph.

Friday Night: Partly cloudy, with a low around 56.

Saturday

High 76°F·Low 56°F

Mostly cloudy, with a high near 76.

Saturday Night: Mostly cloudy, with a low around 56.

Sunday

High 74°F·Low 59°F

A chance of rain showers after 7am. Mostly cloudy, with a high near 74. Chance of precipitation is 40%.

Sunday Night: A chance of rain showers. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.

Monday

High 76°F·Low 58°F

A chance of rain showers. Mostly cloudy, with a high near 76. Chance of precipitation is 50%.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 58. Chance of precipitation is 30%.

Tuesday

High 79°F·Low 59°F

A slight chance of rain showers before 7am. Partly sunny, with a high near 79.

Tuesday Night: A slight chance of rain showers after 1am. Partly cloudy, with a low around 59.

Nearby cities

Larger cities in the area

See every city we cover in South Carolina, or check all active alerts.

About this forecast

Forecast office
Sumter is served by the National Weather Service CAE forecast office, forecast zone SCZ031, county zone SCC085.
Location used
The Census Bureau's internal point for Sumter (33.9408, -80.3955), in Sumter County. Population: 42,958 (2024 estimate), number 10 of the 27 South Carolina cities on this site.
Radar
Nearest NWS radar: KCAE. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/33.9408,-80.3955 (forecast issued Oct 28, 6:51 AM EDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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