Sullivans Island in December
Find out everything about the water temperature in Sullivans Island in December. Average, minimum and maximum recorded temperatures as well as daily temperature in December for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in December
Minimum:
47.4 °F
Average:
57.5 °F
Maximum:
65.7 °F
Sea water temperature in Sullivans Island in December
In the city of Sullivans Island, the month of December is too cold for swimming. The minimum recorded temperature during this month was 47.4°F on December 31, 2022, with an average temperature being 57.5°F and a maximum temperature reaching 65.7°F on December 1, 2020.
| Date | 10 years average | 2025 | 2024 |
|---|---|---|---|
| Dec 1 | 60.4°F | 60.0°F | 63.3°F |
| Dec 2 | 60.3°F | 60.5°F | 61.8°F |
| Dec 3 | 60.3°F | 60.9°F | 60.9°F |
| Dec 4 | 60.4°F | 61.1°F | 59.9°F |
| Dec 5 | 59.6°F | 58.0°F | 57.9°F |
| Dec 6 | 59.7°F | 59.1°F | 57.8°F |
| Dec 7 | 59.5°F | 59.3°F | 56.7°F |
| Dec 8 | 59.4°F | 59.7°F | 55.9°F |
| Dec 9 | 59.1°F | 59.3°F | 55.0°F |
| Dec 10 | 58.8°F | 56.2°F | 56.4°F |
| Dec 11 | 58.6°F | 54.8°F | 54.7°F |
| Dec 12 | 58.3°F | 54.7°F | 54.9°F |
| Dec 13 | 57.7°F | 53.1°F | 55.1°F |
| Dec 14 | 57.7°F | 55.0°F | 55.3°F |
| Dec 15 | 57.5°F | 55.7°F | 55.1°F |
| Dec 16 | 56.9°F | 54.4°F | 55.4°F |
| Dec 17 | 56.9°F | 53.6°F | 54.7°F |
| Dec 18 | 57.1°F | 51.7°F | 56.0°F |
| Dec 19 | 57.1°F | 53.4°F | 58.0°F |
| Dec 20 | 56.9°F | 52.5°F | 58.0°F |
| Dec 21 | 56.5°F | 53.3°F | 58.2°F |
| Dec 22 | 56.5°F | 52.7°F | 56.4°F |
| Dec 23 | 56.1°F | 54.5°F | 55.9°F |
| Dec 24 | 55.5°F | 52.7°F | 53.9°F |
| Dec 25 | 55.5°F | 55.1°F | 52.2°F |
| Dec 26 | 55.0°F | 55.4°F | 51.7°F |
| Dec 27 | 54.7°F | 56.1°F | 51.4°F |
| Dec 28 | 54.8°F | 56.7°F | 51.0°F |
| Dec 29 | 55.1°F | 56.3°F | 52.4°F |
| Dec 30 | 55.5°F | 56.8°F | 53.3°F |
| Dec 31 | 55.3°F | 56.2°F | 54.1°F |
In Sullivans Island, the months May through October offer comfortable swimming conditions, which amounts to 157 swimming days.
The warmest water in Sullivans Island was recorded on August 1, 2025, reaching a 86.8°F. While the coldest temperature occurred on January 26, 2025, dipping to 44.1°F. The average readings by season are 56.2°F in Winter, 67.2°F in Spring, 82.7°F in Summer, and 73.5°F in Autumn.
December's average temperature is a slight drop from November's average of 65.2°F. In January, the temperature is expected to decrease further, potentially averaging around 55.3°F.