Siesta Key
Florida, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Siesta Key, FL

An excellent water temperature of 84.7°F (29.3°C) makes September in Siesta Key, Florida, a prime for swimming and other water activities.

Ocean temperature

In Siesta Key, the average seawater temperature in September is 84.7°F (29.3°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Siesta Key, Florida, the average length of the day in September is 12.3h.

How warm is the water in September in Siesta Key?

In Siesta Key, in September, the average water temperature is 84.7°F (29.3°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in September in Siesta Key?

In Siesta Key, Florida, the average length of the day in September is 12.3h.
Average sea temperature in September - Siesta Key, FL
  • Average sea temperature in September: 84.8°F

The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64.1°F).

Average daylight in September - Siesta Key, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.8h).
The month with shortest days is December (Average daylight: 10.4h).