World Resorts USA Siesta Key Weather

Siesta Key sea water temperature

Current sea water temperature:
+55.8°F
Minimum sea water temperature in February: 74.3°F
Maximum sea water temperature in February: 55.8°F
Average sea water temperature in February: 66.1°F

Sea water temperature for the last 10 days:

February 5 55.8°F January 31 59.7°F
February 4 57.9°F January 30 59.7°F
February 3 57.7°F January 29 61.2°F
February 2 58.8°F January 28 63.7°F
February 1 59.7°F January 27 65.1°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.

Best time for vacation in Siesta Key

Sunniest months:
March 20 days
May 18 days
April 17 days
Warmest months:
July 88.1 °F
August 88.0 °F
June 86.3 °F
Warmest sea temp:
August 87.6 °F
July 87.1 °F
September 85.8 °F
Coldest months:
January 66.9 °F
December 70.9 °F
February 71.0 °F
Rainiest months:
June 5 days
July 4 days
September 3 days
Windiest months:
November 10.5 mph
January 10.4 mph
October 10.4 mph

Siesta Key on a weather map

Siesta Key
+57°F
SE 14 mph
Feels like: +55°F
Precip.: 100%
Places in USA:
Name
°F
+12°F
+70°F
+70°F
+50°F
+61°F
+61°F
+64°F
+64°F
+7°F
+59°F
+52°F
+57°F
+55°F
+43°F
+18°F
24 Hours Forecast
Siesta Key
Local time: 07:59
February 05, thursday
0900
57°F
SE
14 mph
1200
54°F
SE
24 mph
1500
57°F
SE
25 mph
1800
54°F
SE
22 mph
2100
52°F
SE
22 mph
February 06, friday
0000
50°F
SE
19 mph
0300
48°F
S
16 mph
0600
50°F
SE
13 mph
Units of measurement: °C / °F