Key Largo Weather: September
 |
Average Day Temperature: | 88.4°F |
|
Average Night Temperature: | 86.6°F |
|
Sea Water Temperature: | 90.7°F |
|
Number of Sunny Days: | 6 days |
| Sunshine Hours: | 11.9 - 12.6 hours | |
|
Number of Rainy Days: | 3 days |
| Precipitation Totals: | 2.1 in | |
| detailed information | ||
forecast
| Key Largo |
Temperature
| Key Largo |
Air Temperature in September, °F
The highest day temperature in September 2025 was 92°F. The lowest night temperature was 83°F. The average values for day and night temperatures during September were 88.8°F и 86.0°F respectivly.
Key Largo Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Key Largo was 90.6°F. The maximum and minimum values were 89.4°F and 92.8°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 Key Largo is 2.1 in. It makes september the most rainy month of the year.
The average wind speed in September is 9.8 mph. It makes September the most windless month of the year for Key Largo.
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 Key Largo in September is 6.5 hours.
Key Largo on the Weather Map
| Boston |  |
+96 |
| Chicago | |
+86 |
| Hawaii |  |
+82 |
| Houston |  |
+80 |
| Las Vegas |  |
+118 |
| Los Angeles | |
+100 |
| Maui | |
+78 |
| Miami | |
+96 |
| Myrtle Beach | |
+90 |
| New York | |
+104 |
| San Diego | |
+94 |
| San Francisco | |
+82 |
| Santa Monica | |
+82 |
| Sarasota | |
+96 |
| Tampa | |
+98 |
| 1800 |  |
90°F | NW 12 mph |
| 2100 |  |
88°F | SE 7 mph |
| 0000 | |
88°F | SW 6 mph |
| 0300 |  |
86°F | W 4 mph |
| 0600 | |
88°F | SW 5 mph |
| 0900 |  |
88°F | SW 7 mph |
| 1200 | |
88°F | W 7 mph |
| 1500 |  |
90°F | NW 11 mph |