Current Sea Water Temperature:
+57.0°F
| Maximum Sea Water Temperature in December: | 69.4°F |
| Minimum Sea Water Temperature in December: | 49.8°F |
| Average water temperature in December: | 60.6°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 16 | 57.0°F | December 11 | 58.6°F |
| December 15 | 58.2°F | December 10 | 60.4°F |
| December 14 | 56.4°F | December 09 | 63.6°F |
| December 13 | 56.8°F | December 08 | 63.2°F |
| December 12 | 57.6°F | December 07 | 62.8°F |
When is the Warmest Sea for St. Simons Island?
According to our data for the last three years for St. Simons Island the highest average sea water temperature was in August, July and September.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for St. Simons Island was 89.7°F. The maximum and minimum values were 87.2°F and 91.8°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for St. Simons Island was 88.3°F. The maximum and minimum values were 85.2°F and 91.8°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for St. Simons Island was 84.1°F. The maximum and minimum values were 81.0°F and 87.2°F respectively.
USA Resorts:
NAME
F°
| Chicago |  |
+34 |
| Hawaii |  |
+80 |
| Honolulu | |
+80 |
| Houston |  |
+64 |
| Las Vegas | |
+72 |
| Los Angeles | |
+72 |
| Maui | |
+76 |
| Miami | |
+76 |
| Miami Beach | |
+80 |
| New York | |
+36 |
| San Diego | |
+68 |
| San Francisco | |
+52 |
| Sarasota | |
+76 |
| Tampa | |
+78 |
| Washington | |
+48 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
St. Simons Island
Local time: 15:43
16 dec, tuesday
| 1800 |  |
58°F | SW 7 mph |
| 2100 |  |
56°F | SW 6 mph |
17 dec, wednesday
| 0000 | |
56°F | SW 4 mph |
| 0300 | |
56°F | S 5 mph |
| 0600 |  |
54°F | S 5 mph |
| 0900 |  |
56°F | S 5 mph |
| 1200 |  |
60°F | SW 4 mph |
| 1500 | |
62°F | SW 5 mph |