29.08
sat
sat
Day
93°F
N 6 mph
Precip.
3%
3%
Night
79°F
SW 9 mph
Precip.
32%
32%
30.08
sun
sun
Day
90°F
NW 6 mph
Precip.
4%
4%
Night
79°F
SW 8 mph
Precip.
19%
19%
31.08
mon
mon
Day
88°F
W 6 mph
Precip.
16%
16%
Night
81°F
W 9 mph
Precip.
22%
22%
01.09
tue
tue
Day
84°F
W 7 mph
Precip.
20%
20%
Night
81°F
W 12 mph
Precip.
23%
23%
02.09
wed
wed
Day
88°F
W 5 mph
Precip.
13%
13%
Night
82°F
W 9 mph
Precip.
21%
21%
03.09
thu
thu
Day
86°F
NW 11 mph
Precip.
44%
44%
Night
79°F
W 8 mph
Precip.
24%
24%
04.09
fri
fri
Day
88°F
NW 6 mph
Precip.
5%
5%
Night
84°F
N 4 mph
Precip.
20%
20%
sea water
temperature
temperature
| Siesta Key |
monthly
weather
weather
| Siesta Key |
current
weather
weather
| Siesta Key |
14 days
forecast
forecast
| Siesta Key |
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 87.0°F. The highest and lowest sea temperatures during the month were 88.3°F and 85.5°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.
Air temperature in Siesta Key, °F
Precipitation total in Siesta Key, in.
* Charts above show average data for the last 3 years.
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: 20:39
August 29, saturday
2100
81°F
S
8 mph
8 mph
August 30, sunday
0000
79°F
SW
9 mph
9 mph
0300
81°F
W
6 mph
6 mph
0600
81°F
W
7 mph
7 mph
0900
82°F
W
7 mph
7 mph
1200
90°F
NW
6 mph
6 mph
1500
90°F
NE
7 mph
7 mph
1800
81°F
W
5 mph
5 mph
