Current sea water temperature:
+69.6°F
| Minimum sea water temperature in December: | 74.3°F |
| Maximum sea water temperature in December: | 61.2°F |
| Average sea water temperature in December: | 68.1°F |
| more information | |
14 days
forecast
forecast
| Siesta Key |
monthly
weather
weather
| Siesta Key |
Sea water temperature for the last 10 days:
| December 14 | 69.6°F | December 9 | 71.6°F |
| December 13 | 69.6°F | December 8 | 71.6°F |
| December 12 | 70.2°F | December 7 | 71.6°F |
| December 11 | 70.0°F | December 6 | 70.9°F |
| December 10 | 71.2°F | December 5 | 70.5°F |
Monthly sea water temperature, °F
When is the warmest sea in Siesta Key?
Based on the data about daily sea water temperature for the last three years the warmest sea in Siesta Key was noticed in August, July and September.
Monthly Sea Temperatures in Siesta Key, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 88.6°F. The highest and lowest sea temperatures during the month were 90.1°F and 86.7°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 86.9°F. The highest and lowest sea temperatures during the month were 89.1°F and 85.6°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 84.9°F. The highest and lowest sea temperatures during the month were 86.7°F and 83.3°F.
current
weather
weather
| Siesta Key |
weather in
December
December
| Siesta Key |
Best time for vacation in Siesta Key
Siesta Key on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Siesta Key
Local time: 01:44
December 15, monday
0300
59°F
SW
19 mph
19 mph
0600
54°F
SW
19 mph
19 mph
0900
55°F
SW
21 mph
21 mph
1200
59°F
SW
20 mph
20 mph
1500
61°F
SW
17 mph
17 mph
1800
61°F
SW
17 mph
17 mph
2100
59°F
SW
16 mph
16 mph
December 16, tuesday
0000
59°F
SW
12 mph
12 mph
