Climate and monthly weather forecast
Sumter, SC

Weather in January

January, the same as December, is a cool winter month in Sumter, South Carolina, with temperature in the range of an average low of 38.1°F (3.4°C) and an average high of 52.9°F (11.6°C). With an average high-temperature of 52.9°F (11.6°C) and an average low-temperature of 38.1°F (3.4°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Sumter, is a moderate month, with an average temperature ranging between min 41°F (5°C) and max 57.7°F (14.3°C). In Sumter, the average high-temperature in February is almost the same as in January - a mild 57.7°F (14.3°C). Weather in February »

Weather in March

March, the first month of the spring in Sumter, is a comfortable month, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 63.9°F (17.7°C). In Sumter, South Carolina, the average high-temperature in March marginally rises from a mild 57.7°F (14.3°C) in February to a comfortable 63.9°F (17.7°C). Weather in March »

Weather in April

April is a moderately hot spring month in Sumter, South Carolina, with an average temperature ranging between min 55°F (12.8°C) and max 73.4°F (23°C). In Sumter, the average high-temperature in April rises from an enjoyable 63.9°F (17.7°C) in March to a moderately hot 73.4°F (23°C). Weather in April »

Weather in May

May, the last month of the spring in Sumter, is also a moderately hot month, with an average temperature fluctuating between 62.8°F (17.1°C) and 80.2°F (26.8°C). In Sumter, the average high-temperature in May slightly increases from 73.4°F (23°C) in April to a still moderately hot 80.2°F (26.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a tropical month in Sumter, South Carolina, with an average temperature fluctuating between 87.4°F (30.8°C) and 70°F (21.1°C). In June, the average high-temperature marginally rises from a moderately hot 80.2°F (26.8°C) in May to a tropical 87.4°F (30.8°C). Weather in June »

Weather in July

July, the same as June, in Sumter, South Carolina, is another hot summer month, with an average temperature ranging between min 72.9°F (22.7°C) and max 90.7°F (32.6°C). With an average high-temperature of 90.7°F (32.6°C) and an average low-temperature of 72.9°F (22.7°C), July is the warmest month. The average heat index in July is appraised at a scorching 109.4°F (43°C). Weather in July »

Weather in August

August, the last month of the summer in Sumter, is also a hot month, with an average temperature fluctuating between 71.4°F (21.9°C) and 88.9°F (31.6°C). In August, the average high-temperature is practically the same as in July - a still tropical 88.9°F (31.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Sumter, South Carolina, with temperature in the range of an average low of 66.6°F (19.2°C) and an average high of 83.7°F (28.7°C). In September, the average high-temperature is practically the same as in August - a moderately hot 83.7°F (28.7°C). Weather in September »

Weather in October

October, the same as September, is a moderately hot autumn month in Sumter, South Carolina, with an average temperature varying between 73.8°F (23.2°C) and 56.7°F (13.7°C). In Sumter, the average high-temperature in October decreases from a moderately hot 83.7°F (28.7°C) in September to a still warm 73.8°F (23.2°C). Weather in October »

Weather in November

November, the last month of the autumn in Sumter, is also an enjoyable month, with an average temperature varying between 62.4°F (16.9°C) and 46.4°F (8°C). In Sumter, the average high-temperature in November decreases from a moderately hot 73.8°F (23.2°C) in October to a comfortable 62.4°F (16.9°C). Weather in November »

Weather in December

The first month of the winter, December, is also a moderate month in Sumter, South Carolina, with an average temperature varying between 56.3°F (13.5°C) and 42.3°F (5.7°C). In December, the average high-temperature slightly decreases from an enjoyable 62.4°F (16.9°C) in November to a mild 56.3°F (13.5°C). Weather in December »
[Resources]

FAQ

What is the coldest month in Sumter?

January is the coldest month in Sumter, with an average high-temperature of 52.9°F (11.6°C) and an average low-temperature of 38.1°F (3.4°C).

What are the least humid months in Sumter?

The months with the lowest humidity are January and November, with an average relative humidity of 70%.

What is the driest month in Sumter?

January is the month with the least rainfall. Rain falls for 10.5 days and accumulates 1.89" (48mm) of precipitation.

How many days does it rain in Sumter?

Throughout the year, in Sumter, South Carolina, there are 161.8 rainfall days, and 33.35" (847mm) of precipitation is accumulated.

When does it snow in Sumter?

January through March, November and December are months with snowfall in Sumter.

How much does it snow in Sumter?

Throughout the year, in Sumter, South Carolina, there are 1.3 snowfall days, and 1.06" (27mm) of snow is accumulated.

When is the lowest UV index in Sumter?

January, February and December, with an average maximum UV index of 3, are months with the lowest UV index.

When does it snow the most in Sumter?

The month with the most snowfall in Sumter, South Carolina, is February, when snow falls for 0.6 days and typically aggregates up to 0.55" (14mm) of snow.

When is Daylight Saving Time (DST) in Sumter?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Sumter, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from EDT to EST.

When it does not snow in Sumter?

In Sumter, snow does not fall in April through October.

What is the most humid month in Sumter?

The most humid month in Sumter is May, with an average relative humidity of 76%.

When are the longest days in Sumter?

The month with the longest days in Sumter, South Carolina, is June, with an average of 14h and 23min of daylight.

What is the month with the highest UV index in Sumter?

June and July, with an average maximum UV index of 7, are months with the highest UV index in Sumter, South Carolina.

What is the warmest month in Sumter?

July is the warmest month in Sumter, South Carolina, with an average high-temperature of 90.7°F (32.6°C) and an average low-temperature of 72.9°F (22.7°C).

What month has the most sunshine in Sumter?

July has the most sunshine of the year in Sumter, South Carolina, with an average of 10.7h of sunshine.

What is the wettest month in Sumter?

The month with the most rainfall in Sumter, South Carolina, is December, when the rain falls for 11 days and typically aggregates up to 3.58" (91mm) of precipitation.

What is the month with the shortest days in Sumter?

December has the shortest days of the year, with an average of 9h and 56min of daylight.

What is the month with the least sunshine in Sumter?

With an average of 5.3h of sunshine, December has the least sunshine of the year in Sumter.

Average temperature
Sumter, SC

Average temperature - Sumter, SC

The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (52.9°F).

The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).

[Resources]

Average pressure
Sumter, SC

Average pressure - Sumter, SC

The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

[Resources]

Average wind speed
Sumter, SC

Average wind speed - Sumter, SC

The windiest months (with the highest average wind speed) are February and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

[Resources]

Average humidity
Sumter, SC

Average humidity - Sumter, SC

The month with the highest relative humidity is May (76%).
The months with the lowest relative humidity are January and November (70%).

[Resources]

Average rainfall
Sumter, SC

Average rainfall - Sumter, SC

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (1.89").

[Resources]

Average rainfall days
Sumter, SC

Average rainfall days - Sumter, SC

The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is October (8.5 days).

[Resources]

Average snowfall
Sumter, SC

Average snowfall - Sumter, SC

The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").

[Resources]

Average snowfall days
Sumter, SC

Average snowfall days - Sumter, SC

The month with the highest number of snowfall days is February (0.6 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

[Resources]

Average daylight / Average sunshine
Sumter, SC

Average daylight / Average sunshine - Sumter, SC

The month with the longest days is June (Average daylight: 14h and 23min).
The month with the shortest days is December (Average daylight: 9h and 56min).

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

[Resources]

Average sunshine days
Sumter, SC

Average sunshine days - Sumter, SC

The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (8.8 days).

[Resources]

Average UV index
Sumter, SC

Average UV index - Sumter, SC

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).

[Resources]

Average visibility
Sumter, SC

Average visibility - Sumter, SC

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location