Water temperature in Charleston (SC) in August
Is it warm enough to swim in Charleston in August? Average water temperature in Charleston in August is 83.3°F and therefore suitable for comfortable swimming. The warmest sea in Charleston in August is 86.5°F, and the coldest is 79.7°F. Average high air temperature in Charleston in August is 90°F, and average low temperature is 72°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Charleston
Changes water temperature in Charleston in August 2025, 2024
To get an accurate forecast for the water temperature in Charleston for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Charleston, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of August.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| August 1 | 86.2°F | 83.8°F | 81.7°F | 86.2°F |
| August 2 | 85.3°F | 84.2°F | 81.7°F | 85.3°F |
| August 3 | 84.4°F | 84.7°F | 81.9°F | 84.7°F |
| August 4 | 83.5°F | 84.9°F | 81.7°F | 84.9°F |
| August 5 | 82.4°F | 84.2°F | 81.7°F | 84.6°F |
| August 6 | 83.1°F | 83.1°F | 82.2°F | 85.1°F |
| August 7 | 83.1°F | 82.6°F | 81.9°F | 84.7°F |
| August 8 | 82.6°F | 83.1°F | 81.5°F | 85.1°F |
| August 9 | 82°F | 82.8°F | 81.9°F | 85.1°F |
| August 10 | 81.7°F | 83.8°F | 81.1°F | 85.5°F |
| August 11 | 82°F | 83.7°F | 82°F | 86°F |
| August 12 | 83.1°F | 84.2°F | 82°F | 85.8°F |
| August 13 | 82.9°F | 84.4°F | 81.5°F | 86.4°F |
| August 14 | 83.1°F | 83.8°F | 81.7°F | 86.4°F |
| August 15 | 83.7°F | 83.5°F | 81.3°F | 86°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| August 16 | 83.7°F | 83.5°F | 81.7°F | 85.8°F |
| August 17 | 83.8°F | 82.8°F | 81.1°F | 85.6°F |
| August 18 | 84°F | 83.3°F | 81°F | 85.5°F |
| August 19 | 84.6°F | 84°F | 81.1°F | 85.6°F |
| August 20 | 84.4°F | 84°F | 82°F | 85.6°F |
| August 21 | 85.3°F | 84°F | 81.9°F | 86.5°F |
| August 22 | 84.4°F | 83.3°F | 81.7°F | 86.2°F |
| August 23 | 83.5°F | 81.3°F | 81.3°F | 85.5°F |
| August 24 | 82.9°F | 79.7°F | 79.7°F | 84.9°F |
| August 25 | 83.1°F | 79.9°F | 79.9°F | 84.7°F |
| August 26 | 82.9°F | 80.2°F | 80.2°F | 84.6°F |
| August 27 | 81.9°F | 81°F | 80.8°F | 84.7°F |
| August 28 | 82°F | 81.3°F | 81°F | 84.7°F |
| August 29 | 82°F | 83.5°F | 81.1°F | 85.3°F |
| August 30 | 81.7°F | 83.7°F | 81.1°F | 84.7°F |
| August 31 | 81.1°F | 84.6°F | 81°F | 85.3°F |
Average water temperature in Charleston in August over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 84.9°F | 83.3°F | 82°F | 84.2°F | 84.4°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 83.7°F | 82.9°F | 84.6°F | 83.1°F | 83.7°F |
Charleston sea state in August
Chart comparing the height of waves in Charleston in August over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Weather and climate in Charleston in August
This data display average monthly climate indicators in Charleston in August based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature90°F
- Average LOW temperature72°F
- Average humidity
79 - Average rainfall days13 days
- Average rainfall183mm/7.2''
- Average daylight13h
- Average sunshine8.3h
- Average UV index10
Charleston water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
