Sumter Average Temperature by Month

This page shows the average temperature in each month of the year in Sumter, South Carolina. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Sumter?
In Sumter, South Carolina, the warmest month is July, with an average daily high temperature of 90.7 °F and an average low of 69.9 °F.
What's the Coldest Month in Sumter?
In Sumter, South Carolina, the coolest month is January, with an average daily high temperature of 55.9 °F and an average low of 32.8 °F.
Month Avg. High Avg. Low
January 55.9 °F 32.8 °F
February 59.0 °F 35.1 °F
March 67.1 °F 41.1 °F
April 75.5 °F 49.2 °F
May 81.9 °F 58.0 °F
June 87.8 °F 66.2 °F
July 90.7 °F 69.9 °F
August 88.8 °F 68.6 °F
September 84.0 °F 63.1 °F
October 75.0 °F 51.2 °F
November 65.5 °F 40.2 °F
December 57.8 °F 35.3 °F
Year 74.1 °F 51.0 °F
Weather Station Details
Years Station Coordinates
1901–2024 Sumter location
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