Charleston — Water Temperature in August

Water Temperature Range

9°C

minimum

13°C

average

15°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2026	2025	2024	2023
AUG 1	-10°C	15°C	12°C	11°C
AUG 2	15°C	12°C	12°C	11°C
AUG 3	15°C	13°C	12°C	11°C
AUG 4	15°C	11°C	12°C	11°C
AUG 5	14°C	11°C	12°C	10°C
AUG 6	12°C	13°C	13°C	11°C
AUG 7	12°C	13°C	13°C	12°C
AUG 8	12°C	13°C	13°C	12°C
AUG 9	12°C	13°C	12°C	12°C
AUG 10	12°C	13°C	13°C	11°C
AUG 11	11°C	12°C	12°C	11°C
AUG 12	11°C	12°C	12°C	11°C
AUG 13	11°C	12°C	12°C	11°C
AUG 14	11°C	12°C	12°C	12°C
AUG 15	11°C	12°C	13°C	12°C
AUG 16	11°C	13°C	13°C	13°C
AUG 17	11°C	13°C	13°C	13°C
AUG 18	11°C	13°C	13°C	13°C
AUG 19	10°C	13°C	13°C	12°C
AUG 20	11°C	13°C	13°C	13°C
AUG 21	11°C	14°C	13°C	13°C
AUG 22	11°C	14°C	13°C	13°C
AUG 23	12°C	13°C	13°C	13°C
AUG 24	11°C	13°C	13°C	12°C
AUG 25	11°C	12°C	12°C	12°C
AUG 26	12°C	13°C	13°C	12°C
AUG 27	12°C	13°C	13°C	12°C
AUG 28	13°C	12°C	13°C	11°C
AUG 29	13°C	12°C	12°C	11°C
AUG 30	13°C	12°C	12°C	10°C
AUG 31	14°C	12°C	12°C	10°C

August: Climate and Swimming Opportunities

Average Night Air Temperature

10°C

Average Day Air Temperature

20°C

Precipitation Amount per Month

30 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

9 hrs

Average Wind Speed

14 km/h

Average Humidity

74%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.