Measurements:
°C
°F
Siesta Key
98°F
NE 11 mph
Feels like: 116°F
Precip: 4%
World Resorts USA Siesta Key Weather

Siesta Key Sea Water Temperature

Current Sea Water Temperature:
+92.6°F
Maximum Sea Water Temperature in July: 93.4°F
Minimum Sea Water Temperature in July: 87.4°F
Average water temperature in July: 91.3°F

Sea Water Temperature for the Last 10 Days:

July 15 92.6°F July 10 92.8°F
July 14 92.6°F July 09 93.0°F
July 13 92.8°F July 08 92.2°F
July 12 92.6°F July 07 92.2°F
July 11 93.2°F July 06 92.4°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

Select Year: 2025 2024 2023

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

Select Year: 2026 2025 2024

The average sea surface temperature in July 2026 for Siesta Key was 92.6°F. The maximum and minimum values were 92.2°F and 93.2°F respectively.

Sea Water Temperature in September

Select Year: 2025 2024 2023

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.

Best Time to Visit Siesta Key
The most sunny months:
March 21 days
May 19 days
April 18 days
The most warm months:
July 92.3 °F
August 92.2 °F
June 91.1 °F
Warmest sea temperature:
August 91.8 °F
July 91.2 °F
September 89.8 °F
The most cold months:
January 68.8 °F
February 73.0 °F
December 73.2 °F
The most rainy months:
July 4 days
June 4 days
September 3 days
The most windy months:
November 10 mph
January 10 mph
October 10 mph

Siesta Key on the Weather Map

USA Resorts:
NAME
Boston +94
Chicago +88
Hawaii +80
Houston +90
Las Vegas +120
Los Angeles +106
Maui +76
Miami +100
Myrtle Beach +96
New York +114
San Diego +96
San Francisco +76
Santa Monica +84
Sarasota +102
Tampa +100
24 Hours Weather Forecast
Siesta Key
Local time: 14:18
15 jul, wednesday
1500 98°F
NE
11 mph
1800 94°F
E
9 mph
2100 90°F
SE
11 mph
16 jul, thursday
0000 90°F
S
9 mph
0300 88°F
S
7 mph
0600 86°F
SW
6 mph
0900 86°F
SW
4 mph
1200 92°F
SE
5 mph