May weather forecast
North Charleston, SC

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Weather in May

With the onset of summer, May experiences a definitive shift in North Charleston's weather. The temperatures rise steeply with the highest reaching 80.8°F (27.1°C) and the lowest at 66.7°F (19.3°C). The increase in temperature is evident as May’s weather takes a marked leap from that of April, drawing closer to the hotter month of June. As summer deepens, so does the city's natural beauty, attracting a high influx of tourists. An increase in daylight and sunshine hours promises sun-soaked days, making May the perfect time for beachside activities.

Temperature

The commencement of May sees a minor shift in the average high-temperature, moving from a moderately hot 74.1°F (23.4°C) in April to a still warm 80.8°F (27.1°C). North Charleston temperatures generally rest at a low of 66.7°F (19.3°C) during the May nights.

Heat index

For most parts of May, the heat index is computed to be 84.2°F (29°C). With constant exposure and activity, a state of weariness might ensue, leading to potential heat cramps.
Note that heat index values are valued for light wind and location in the shade. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.

Humidity

The average relative humidity in May is 75%.

Rainfall

In North Charleston, in May, it is raining for 13.4 days, with typically 1.42" (36mm) of accumulated precipitation. In North Charleston, during the entire year, the rain falls for 154.4 days and collects up to 23.43" (595mm) of precipitation.

Snowfall

In North Charleston, snow does not fall in March through November.

Daylight

In May, the average length of the day is 13h and 52min.
On the first day of the month, sunrise is at 6:31 am and sunset at 8:02 pm. On the last day of May, sunrise is at 6:12 am and sunset at 8:22 pm EDT.

Sunshine

The average sunshine in May is 10.4h.

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 vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 7 in May converts into the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
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Frequently asked questions

What is the average May temperature in North Charleston?

The average high-temperature, in May, in North Charleston, is 80.8°F (27.1°C), while the average low-temperature is 66.7°F (19.3°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in May is computed to be 84.2°F (29°C).

What is the average humidity in May in North Charleston?

The average relative humidity in May in North Charleston, South Carolina, is 75%.

How many days does it rain in May in North Charleston?

In May, in North Charleston, the rain falls for 13.4 days. Throughout May, 1.42" (36mm) of precipitation is accumulated.

When it does not snow in North Charleston?

March through November are months without snowfall.

How many hours of daylight does North Charleston have in May?

The average day length in May is 13h and 52min.

When are sunrise and sunset in May in North Charleston?

On the first day of May in North Charleston, sunrise is at 6:31 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 8:22 pm EDT.

How long on average sun shines in May in North Charleston?

In North Charleston, South Carolina, the average sunshine duration in May is 10.4h.

What is the month with the highest UV index in North Charleston?

May through August, with an average maximum UV index of 7, are months with the highest UV index in North Charleston, South Carolina.

What is the UV index intensity in May in North Charleston?

In North Charleston, South Carolina, the average daily maximum UV index in May is 7. A UV Index reading of 6 to 7 represents a high hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
North Charleston, SC

Average temperature in May - North Charleston, SC
  • Average high temperature in May: 80.8°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (56.8°F).

  • Average low temperature in May: 66.7°F

The month with the highest average low temperature is July (76.5°F).
The coldest month (with the lowest average low temperature) is January (42.8°F).

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Average pressure in May
North Charleston, SC

Average pressure in May - North Charleston, 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 (29.98"Hg).

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Average wind speed in May
North Charleston, SC

Average wind speed in May - North Charleston, SC
  • Average wind speed in May: 7.5mph

The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

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Average humidity in May
North Charleston, SC

Average humidity in May - North Charleston, SC
  • Average humidity in May: 75%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (72%).

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Average rainfall in May
North Charleston, SC

Average rainfall in May - North Charleston, SC
  • Average rainfall in May: 1.42"

The wettest month (with the highest rainfall) is August (4.29").
The driest month (with the least rainfall) is January (0.67").

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Average rainfall days in May
North Charleston, SC

Average rainfall days in May - North Charleston, SC
  • Average rainfall days in May: 13.4 days

The month with the highest number of rainy days is August (22.7 days).
The month with the least rainy days is November (6.9 days).

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Average snowfall days in May
North Charleston, SC

Average snowfall days in May - North Charleston, SC
  • Average snowfall days in May: 0 days

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

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Average daylight in May /
Average sunshine in May
North Charleston, SC

Average daylight in May / Average sunshine in May - North Charleston, SC
  • Average daylight in May: 13h and 5min

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 0min).

  • Average sunshine in May: 10h and 2min

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 36min).

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Average sunshine days in May
North Charleston, SC

Average sunshine days in May - North Charleston, SC
  • Average sunshine days in May: 15.8 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (6.1 days).

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Average UV index in May
North Charleston, SC

Average UV index in May - North Charleston, SC
  • Average UV index in May: 7

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

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Average cloud cover in May
North Charleston, SC

Average cloud cover in May - North Charleston, SC
  • Average cloud cover in May: 29

The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are June and July (Cloud cover 26).

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Average visibility in May
North Charleston, SC

Average visibility in May - North Charleston, 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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North Charleston, South Carolina, USA

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