July weather forecast and climate
Charleston, SC

Julio, the same as Junio, in Charleston, South Carolina, is another tropical summer month, with average temperature fluctuating between 91°F (32.8°C) and 73°F (22.8°C).

Temperature

The warmest month is Julio, with an average high-temperature of 91°F (32.8°C) and an average low-temperature of 73°F (22.8°C).

Heat index

The average heat index is calculated to a blazing hot 114.3°F (45.7°C). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the 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 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, pregnancy, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in Julio is 76.6%.

Rainfall

In Charleston, in Julio, it is raining for 13 days, with typically 6.53" (165.9mm) of accumulated precipitation. In Charleston, during the entire year, the rain falls for 112.7 days and collects up to 51.03" (1296.1mm) of precipitation.

Snowfall

In Charleston snow does not fall in Enero, Marzo through Noviembre.

Ocean temperature

In Charleston, the average water temperature is 82.9°F (28.3°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Julio, the average length of the day in Charleston is 14.1h.

Sunshine

In Julio, the average sunshine is 9.3h.

UV index

Months with the highest UV index are Junio through Agosto, with an average maximum UV index of 10. A UV Index estimate of 8 to 10 represents a very high health risk from unsafe exposure to the UV radiation for average individuals.
Note: In Julio, the average maximum UV index of 10 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. 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. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.