Sullivans Island in January
Find out everything about the water temperature in Sullivans Island in January. Average, minimum and maximum recorded temperatures as well as daily temperature in January for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in January
Minimum:
44.1 °F
Average:
55.3 °F
Maximum:
67.7 °F
Sea water temperature in Sullivans Island in January
In the city of Sullivans Island, the month of January is too cold for swimming. The minimum recorded temperature during this month was 44.1°F on January 26, 2025, with an average temperature being 55.3°F and a maximum temperature reaching 67.7°F on January 1, 2016.
| Date | 10 years average | 2026 | 2025 |
|---|---|---|---|
| Jan 1 | 56.7°F | 55.4°F | 54.2°F |
| Jan 2 | 56.9°F | 54.5°F | 54.8°F |
| Jan 3 | 56.7°F | 54.7°F | 53.5°F |
| Jan 4 | 57.1°F | 54.8°F | 54.9°F |
| Jan 5 | 56.6°F | 55.5°F | 53.6°F |
| Jan 6 | 56.3°F | 56.3°F | 52.3°F |
| Jan 7 | 56.2°F | 56.0°F | 53.3°F |
| Jan 8 | 55.9°F | 55.8°F | 52.8°F |
| Jan 9 | 55.7°F | 55.3°F | 51.9°F |
| Jan 10 | 56.0°F | 55.7°F | 51.2°F |
| Jan 11 | 55.8°F | 55.5°F | 51.4°F |
| Jan 12 | 55.9°F | 55.6°F | 50.0°F |
| Jan 13 | 55.8°F | 55.5°F | 49.0°F |
| Jan 14 | 56.0°F | 55.7°F | 49.8°F |
| Jan 15 | 55.3°F | 55.0°F | 48.2°F |
| Jan 16 | 55.5°F | 55.2°F | 49.0°F |
| Jan 17 | 55.4°F | 55.1°F | 49.7°F |
| Jan 18 | 55.0°F | 54.7°F | 48.5°F |
| Jan 19 | 54.5°F | 54.2°F | 49.1°F |
| Jan 20 | 54.6°F | 54.3°F | 50.0°F |
| Jan 21 | 54.9°F | 54.6°F | 49.9°F |
| Jan 22 | 55.0°F | 54.7°F | 49.9°F |
| Jan 23 | 54.8°F | 54.5°F | 49.3°F |
| Jan 24 | 54.3°F | 54.0°F | 49.1°F |
| Jan 25 | 54.0°F | 53.7°F | 46.5°F |
| Jan 26 | 53.6°F | 53.3°F | 44.1°F |
| Jan 27 | 53.7°F | 53.4°F | 44.2°F |
| Jan 28 | 53.8°F | 53.5°F | 45.2°F |
| Jan 29 | 53.6°F | 53.3°F | 45.8°F |
| Jan 30 | 53.9°F | 53.6°F | 46.9°F |
| Jan 31 | 53.7°F | 53.4°F | 47.9°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.
January's temperature is a dip compared to warmer December at 57.5°F and February at 55.8°F.