June weather forecast
Sumter, SC

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Weather in June

As the first official month of summer, June.Sun shines the longest with 14.4 hours of daylight and 10.5 hours of sunshine per day. Sumter’s climate reflects summer with a high temperature of 87.4°F (30.8°C) and a low of 70°F (21.1°C). The progression of weather from June to July exhibits a slight yet consistent upsurge in temperature and humidity, indicating the peak of South Carolina's summer period.

Temperature

The commencement of June sees a minor shift in the average high-temperature, moving from a moderately hot 80.2°F (26.8°C) in May to a tropical 87.4°F (30.8°C). In the month of June, the nighttime temperature dips to a steady average of 70°F (21.1°C).

Heat index

During June, the heat index is appraised at a very hot 100.4°F (38°C). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

In Sumter, the average relative humidity in June is 74%.

Rainfall

In Sumter, during June, the rain falls for 17.1 days and regularly aggregates up to 3.11" (79mm) of precipitation. Throughout the year, there are 161.8 rainfall days, and 33.35" (847mm) of precipitation is accumulated.

Snowfall

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

Daylight

June has the longest days of the year in Sumter, with an average of 14h and 24min of daylight.
On the first day of the month, sunrise is at 6:11 am and sunset at 8:27 pm. On the last day of June, in Sumter, sunrise is at 6:13 am and sunset at 8:36 pm EDT.

Sunshine

In June, the average sunshine in Sumter is 10.5h.

UV index

June and July, with an average maximum UV index of 7, are months with the highest UV index in Sumter, South Carolina. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 7 in June translates into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
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Frequently asked questions

How hot is it in Sumter in June?

The high-temperature, in June, in Sumter, is 87.4°F (30.8°C), while the low-temperature averages to 70°F (21.1°C). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in June is appraised at 100.4°F (38°C).

What is the average humidity in June in Sumter?

In June, the average relative humidity is 74%.

How many days does it rain in June in Sumter?

In Sumter, South Carolina, during June, the rain falls for 17.1 days and regularly aggregates up to 3.11" (79mm) of precipitation.

When it does not snow in Sumter?

April through October are months without snowfall in Sumter.

When are the longest days in Sumter?

With an average of 14h and 24min of daylight, June has the longest days of the year in Sumter.

What is the average length of the day in June in Sumter?

In June, the average day length in Sumter, South Carolina, is 14h and 23min.

When are sunrise and sunset in June in Sumter?

On the first day of June in Sumter, sunrise is at 6:11 am and sunset at 8:27 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:36 pm EDT.

How many hours of sunshine does Sumter have in June?

In June, the average sunshine duration in Sumter, South Carolina, is 10.5h.

When is the highest UV index in Sumter?

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

What is the UV index intensity in June in Sumter?

In Sumter, South Carolina, the average daily maximum UV index in June is 7. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in June
Sumter, SC

Average temperature in June - Sumter, SC
  • Average high temperature in June: 87.4°F

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).

  • Average low temperature in June: 70°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).

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Average pressure in June
Sumter, SC

Average pressure in June - Sumter, SC
  • Average pressure in June: 29.97"Hg

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).

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Average wind speed in June
Sumter, SC

Average wind speed in June - Sumter, SC
  • Average wind speed in June: 6.3mph

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).

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Average humidity in June
Sumter, SC

Average humidity in June - Sumter, SC
  • Average humidity in June: 74%

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

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Average rainfall in June
Sumter, SC

Average rainfall in June - Sumter, SC
  • Average rainfall in June: 3.11"

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

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Average rainfall days in June
Sumter, SC

Average rainfall days in June - Sumter, SC
  • Average rainfall days in June: 17.1 days

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).

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Average snowfall in June
Sumter, SC

Average snowfall in June - Sumter, SC
  • Average snowfall in June: 0"

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").

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Average snowfall days in June
Sumter, SC

Average snowfall days in June - Sumter, SC
  • Average snowfall days in June: 0 days

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).

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Average daylight in June /
Average sunshine in June
Sumter, SC

Average daylight in June / Average sunshine in June - Sumter, SC
  • Average daylight in June: 14h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in June: 10h and 3min

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).

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Average sunshine days in June
Sumter, SC

Average sunshine days in June - Sumter, SC
  • Average sunshine days in June: 10.8 days

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

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Average UV index in June
Sumter, SC

Average UV index in June - Sumter, SC
  • Average UV index in June: 7

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).

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Average cloud cover in June
Sumter, SC

Average cloud cover in June - Sumter, SC
  • Average cloud cover in June: 30

The months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).

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Average visibility in June
Sumter, SC

Average visibility in June - Sumter, SC
  • Average visibility in June: 6mi

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).

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Sumter, South Carolina, USA

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