May weather forecast
Summerville, SC

Weather in May

The last month of the spring, May, is also a moderately hot month in Summerville, South Carolina, with an average temperature varying between 64.6°F (18.1°C) and 82°F (27.8°C).

Temperature

In Summerville, the average high-temperature in May marginally rises from 75.4°F (24.1°C) in April to a still moderately hot 82°F (27.8°C). In Summerville, South Carolina, in May, the average low-temperature is 64.6°F (18.1°C).

Heat index

The average heat index in May is estimated at a hot 87.6°F (30.9°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, wind, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In May, the average relative humidity is 75%.

Rainfall

In Summerville, during 10 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. In Summerville, during the entire year, the rain falls for 120.6 days and collects up to 11.18" (284mm) of precipitation.

Snowfall

In Summerville, snow does not fall in March through December.

Daylight

In May, the average length of the day is 13h and 52min.
On the first day of the month, sunrise is at 6:32 am and sunset at 8:02 pm. On the last day of May, sunrise is at 6:13 am and sunset at 8:23 pm EDT.

Sunshine

In May, the average sunshine is 10h.

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the average person.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in May in Summerville?

In Summerville, South Carolina, in May, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 64.6°F (18.1°C). In May, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is estimated at 87.6°F (30.9°C).

What is the average humidity in May in Summerville?

In Summerville, South Carolina, the average relative humidity in May is 75%.

How much does it rain in Summerville in May?

In Summerville, South Carolina, in May, it is raining for 10 days, with typically 0.67" (17mm) of accumulated precipitation.

When it does not snow in Summerville?

In Summerville, snow does not fall in March through December.

What is the average length of the day in May in Summerville?

In Summerville, South Carolina, the average day length in May is 13h and 52min.

When is the sunrise / sunset in May in Summerville?

In May, on the first day of the month, sunrise is at 6:32 am and sunset at 8:02 pm. On the last day of the month, in Summerville, sunrise is at 6:13 am and sunset at 8:23 pm EDT.

How many hours of sunshine does Summerville have in May?

In Summerville, South Carolina, the average sunshine duration in May is 10h.

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

The months with the highest UV index in Summerville are May through August, with an average maximum UV index of 7.

What is the UV index reading in May in Summerville?

The average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Summerville, SC

Average temperature in May - Summerville, SC
  • Average high temperature in May: 82°F

The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (56.8°F).

  • Average low temperature in May: 64.6°F

The month with the highest average low temperature is July (74.7°F).
The coldest month (with the lowest average low temperature) is January (40.1°F).

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Average pressure in May
Summerville, SC

Average pressure in May - Summerville, SC
  • Average pressure in May: 30.03"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

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Average wind speed in May
Summerville, SC

Average wind speed in May - Summerville, SC
  • Average wind speed in May: 6.1mph

The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in May
Summerville, SC

Average humidity in May - Summerville, SC
  • Average humidity in May: 75%

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (72%).

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Average rainfall in May
Summerville, SC

Average rainfall in May - Summerville, SC
  • Average rainfall in May: 0.67"

The wettest month (with the highest rainfall) is August (2.09").
The driest month (with the least rainfall) is January (0.28").

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Average rainfall days in May
Summerville, SC

Average rainfall days in May - Summerville, SC
  • Average rainfall days in May: 10 days

The month with the highest number of rainy days is August (18.3 days).
The month with the least rainy days is January (5.7 days).

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Average snowfall in May
Summerville, SC

Average snowfall in May - Summerville, SC
  • Average snowfall in May: 0"

The months with the highest snowfall are January and February (0.04").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in May
Summerville, SC

Average snowfall days in May - Summerville, SC
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in May /
Average sunshine in May
Summerville, SC

Average daylight in May / Average sunshine in May - Summerville, SC
  • Average daylight in May: 13h and 52min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 1min).

  • Average sunshine in May: 10h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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Average sunshine days in May
Summerville, SC

Average sunshine days in May - Summerville, SC
  • Average sunshine days in May: 17.4 days

The month with the most sunshine days is January (23.6 days).
The month with the least sunshine days is August (7.4 days).

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Average UV index in May
Summerville, SC

Average UV index in May - Summerville, SC
  • Average UV index in May: 7

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

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Average cloud cover in May
Summerville, SC

Average cloud cover in May - Summerville, SC
  • Average cloud cover in May: 34

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

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Average visibility in May
Summerville, SC

Average visibility in May - Summerville, SC
  • Average visibility in May: 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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