Current Sea Water Temperature:
+71.8°F
| Maximum Sea Water Temperature in December: | 77.0°F |
| Minimum Sea Water Temperature in December: | 62.4°F |
| Average water temperature in December: | 70.2°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 13 | 71.8°F | December 08 | 74.0°F |
| December 12 | 72.4°F | December 07 | 74.0°F |
| December 11 | 72.2°F | December 06 | 73.2°F |
| December 10 | 73.6°F | December 05 | 72.8°F |
| December 09 | 74.0°F | December 04 | 71.4°F |
When is the Warmest Sea for Siesta Key?
According to our data for the last three years for Siesta Key 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 Siesta Key was 92.8°F. The maximum and minimum values were 90.8°F and 94.6°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Siesta Key was 91.0°F. The maximum and minimum values were 89.6°F and 93.4°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Siesta Key was 88.7°F. The maximum and minimum values were 87.0°F and 90.8°F respectively.
USA Resorts:
NAME
F°
| Chicago |  |
+8 |
| Hawaii |  |
+80 |
| Honolulu |  |
+86 |
| Houston | |
+74 |
| Las Vegas |  |
+76 |
| Los Angeles | |
+72 |
| Maui | |
+76 |
| Miami |  |
+80 |
| Miami Beach | |
+82 |
| New York | |
+36 |
| San Diego | |
+64 |
| San Francisco | |
+52 |
| Sarasota | |
+76 |
| Tampa | |
+78 |
| Washington | |
+44 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Siesta Key
Local time: 17:43
13 dec, saturday
| 1800 |  |
78°F | E 7 mph |
| 2100 |  |
74°F | S 5 mph |
14 dec, sunday
| 0000 | |
72°F | W 7 mph |
| 0300 | |
72°F | W 7 mph |
| 0600 | |
70°F | W 7 mph |
| 0900 |  |
72°F | W 5 mph |
| 1200 |  |
76°F | S 5 mph |
| 1500 |  |
76°F | SE 12 mph |