July weather forecast
Sumter, SC

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Weather in July

July is truly the height of summer in Sumter, characterized by long days, heat, and humidity. Although the month’s average high temperature is a scorching 90.7°F (32.6°C), the low of 72.9°F (22.7°C) provides a hint of nighttime relief. With the sun blazing for a substantial 14.2 daylight hours, anticipate a slight decrease as August approaches. Despite the heat, Sumter residents enjoy an average of 20.1 rainfall days, offering much-needed respite.

Temperature

In Sumter, July is the warmest month, with temperatures averaging a high of 90.7°F (32.6°C) and a low of 72.9°F (22.7°C).

Heat index

July's mean heat index is appraised at a blisteringly hot 109.4°F (43°C). Warning: Heat cramps and heat exhaustion are anticipated. Heatstroke is a risk with ongoing activity.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is an aggregate value of air's warmth and moisture to show the human-felt temperature. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The average relative humidity in July in Sumter is 73%.

Rainfall

In Sumter, in July, during 20.1 rainfall days, 3.23" (82mm) of precipitation is typically accumulated. In Sumter, during the entire year, the rain falls for 161.8 days and collects up to 33.35" (847mm) of precipitation.

Snowfall

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

Daylight

In July, the average length of the day is 14h and 9min.
On the first day of July, sunrise is at 6:14 am and sunset at 8:36 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 8:22 pm EDT.

Sunshine

With an average of 10.7h of sunshine, July has the most sunshine of the year.

UV index

June and July, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The average daily UV index of 7 in July transforms into the following instructions:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.
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Frequently asked questions

What part of the year is the hottest in Sumter?

With average high and low temperatures of 90.7°F (32.6°C) and 72.9°F (22.7°C) respectively, July is Sumter's warmest month.

How hot does it get in Sumter in July?

During July, Sumter experiences an average high-temperature of 90.7°F (32.6°C) and a low-temperature of 72.9°F (22.7°C). In July, the average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, is appraised at 109.4°F (43°C).

What is the average humidity in July in Sumter?

The average relative humidity in July in Sumter, South Carolina, is 73%.

How many days does it rain in July in Sumter?

In Sumter, South Carolina, in July, it is raining for 20.1 days, with typically 3.23" (82mm) of accumulated precipitation.

When it does not snow in Sumter?

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

How many hours of daylight does Sumter have in July?

In Sumter, South Carolina, the average day length in July is 14h and 9min.

When is the sunrise / sunset in July in Sumter?

On the first day of July in Sumter, sunrise is at 6:14 am and sunset at 8:36 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 8:22 pm EDT.

What month has the most sunshine in Sumter?

July has the most sunshine of the year, with an average of 10.7h of sunshine.

How many hours of sunshine does Sumter have in July?

In July, the average sunshine duration is 10.7h.

When is the highest UV index in Sumter?

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

How high is the UV index in July in Sumter?

In July, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health threat from exposure to the Sun's UV radiation.
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 July
Sumter, SC

Average temperature in July - Sumter, SC
  • Average high temperature in July: 90.7°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 July: 72.9°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).

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Average pressure in July
Sumter, SC

Average pressure in July - Sumter, SC
  • Average pressure in July: 29.99"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 July
Sumter, SC

Average wind speed in July - Sumter, SC
  • Average wind speed in July: 6.2mph

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 July
Sumter, SC

Average humidity in July - Sumter, SC
  • Average humidity in July: 73%

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 July
Sumter, SC

Average rainfall in July - Sumter, SC
  • Average rainfall in July: 3.23"

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 July
Sumter, SC

Average rainfall days in July - Sumter, SC
  • Average rainfall days in July: 20.1 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 July
Sumter, SC

Average snowfall in July - Sumter, SC
  • Average snowfall in July: 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 July
Sumter, SC

Average snowfall days in July - Sumter, SC
  • Average snowfall days in July: 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 July /
Average sunshine in July
Sumter, SC

Average daylight in July / Average sunshine in July - Sumter, SC
  • Average daylight in July: 14h and 1min

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 July: 10h and 4min

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 July
Sumter, SC

Average sunshine days in July - Sumter, SC
  • Average sunshine days in July: 8.8 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 July
Sumter, SC

Average UV index in July - Sumter, SC
  • Average UV index in July: 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 July
Sumter, SC

Average cloud cover in July - Sumter, SC
  • Average cloud cover in July: 31

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 July
Sumter, SC

Average visibility in July - Sumter, SC
  • Average visibility in July: 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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