Siesta Key Weather: September
 |
Average Day Temperature: | 90.2°F |
|
Average Night Temperature: | 81.6°F |
|
Sea Water Temperature: | 89.8°F |
|
Number of Sunny Days: | 7 days |
| Sunshine Hours: | 11.9 - 12.7 hours | |
|
Number of Rainy Days: | 3 days |
| Precipitation Totals: | 2.2 in | |
| detailed information | ||
forecast
| Siesta Key |
Temperature
| Siesta Key |
Air Temperature in September, °F
The highest day temperature in September 2025 was 96°F. The lowest night temperature was 76°F. The average values for day and night temperatures during September were 90.8°F и 79.7°F respectivly.
Siesta Key Water Sea Temperature in September, °F
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.
Most of the days in September are cloudy but you can also expect sunny or gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Siesta Key is 2.2 in. It makes september the most rainy month of the year.
The average wind speed in September is 8.1 mph. It makes September one of the most windless months of the year for Siesta Key.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Siesta Key in September is 6.6 hours.
Siesta Key on the Weather Map
| Chicago |  |
0 |
| Hawaii |  |
+78 |
| Honolulu | |
+78 |
| Houston | |
+46 |
| Las Vegas |  |
+40 |
| Los Angeles | |
+52 |
| Maui | |
+72 |
| Miami | |
+72 |
| Miami Beach | |
+80 |
| New York | |
+18 |
| San Diego | |
+54 |
| San Francisco | |
+46 |
| Sarasota | |
+62 |
| Tampa | |
+62 |
| Washington | |
+28 |
| 0300 |  |
64°F | W 6 mph |
| 0600 | |
64°F | NW 7 mph |
| 0900 |  |
68°F | N 7 mph |
| 1200 |  |
72°F | N 12 mph |
| 1500 | |
74°F | N 11 mph |
| 1800 | |
74°F | N 7 mph |
| 2100 | |
74°F | N 7 mph |
| 0000 | |
74°F | NE 6 mph |