Key Largo in september: average Weather, Temperature and Climate
Weather in Key Largo in september 2026
The weather in Key Largo in september comes from statistical datas on the last years. You can view the weather statistics for all the month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
very bad weather UV index: 7
Weather at 6am
85°F
Moderate rain at times
28% of time
27%
24%
17%
Weather at 12pm
86°F
Clear/Sunny
37% of time
25%
18%
17%
Weather at 6pm
85°F
Clear/Sunny
46% of time
30%
14%
8%
Weather at 3am
85°F
34%
28%
24%
13%
Evolution of daily average temperature and precipitation in Key Largo in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Key Largo in september.
The climate of Key Largo in september is very bad
the weather in Key Largo in september is wet (with 11.9in of rainfall over 17 days). The weather's not getting better compared to the previous month since in august there is an average of 12.1in of precipitation over 16 days.
The climate enjoyable in this city the month of september. The thermometer averaged maximum of 86°F. The minimum is 85°F. Thus, the mean temperature average on this month of september in Key Largo is 85°F. Note that these seasonal averages are in contrast with those observed in Key Largo in september with a maximum record of 88°F in 2011 and a minimum record of 72°F in 2020. You You can hope to have about 10 days with temperatures over 86°F, or 33 of the month.
In september in Key Largo, the days on average last 12:17. The sun rises at 06:08 and sunset is at 18:25.
With a correct weather, the month of september is okay (but not good) to go there in Florida.
Seasonal average climate and temperature of Key Largo in september
Check below seasonal norms These statistics are generated from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 85°F | ||||
| Highest temperature | 86°F | ||||
| Lowest temperature | 85°F | ||||
| Highest record temperature | 88°F (2011) | ||||
| Lowest record temperature | 72°F (2020) | ||||
| Number of days at +86°F | 10 day(s) (33%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Sea temperature | |||||
| Average sea temperature | 86°F | ||||
| Lowest sea temperature | 85°F | ||||
| Highest sea temperature | 87°F | ||||
| Wind | |||||
| Wind speed | 19km/h | ||||
| Wind temperature | 85°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 11.9in | ||||
| Number of days with rainfall | 17 day(s) (57%) | ||||
| Record daily rainfall | 10.7in (2017) | ||||
| Other climate data | |||||
| Humidity | 76% | ||||
| Visibility | 9.18km | ||||
| Cloud cover | 31% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:08 | ||||
| Time of sunset | 18:25 | ||||
| Length of day | 12:17 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | very bad | ||||
How was the weather last september?
Here is the day by day recorded weather in Key Largo in september 2025:
85°F to 86°F
85°F to 86°F
85°F to 86°F
81°F to 85°F
83°F to 85°F
81°F to 85°F
83°F to 85°F
83°F to 83°F
83°F to 85°F
83°F to 85°F
83°F to 86°F
83°F to 85°F
81°F to 83°F
83°F to 85°F
85°F to 85°F
85°F to 85°F
85°F to 86°F
83°F to 85°F
79°F to 86°F
83°F to 86°F
83°F to 85°F
83°F to 85°F
83°F to 85°F
83°F to 86°F
83°F to 85°F
83°F to 86°F
83°F to 86°F
83°F to 85°F
79°F to 86°F
83°F to 86°F
Map: other cities in Florida in september
Cities near Key Largo:
| Islamorada in september | very bad weather |
| Biscayne National Park in september | very bad weather |
| Everglades National Park in september | very bad weather |
| Miami in september | very bad weather |
| Big Pine Key in september | very bad weather |
| Fort Lauderdale in september | very bad weather |
| Big Cypress National Preserve in september | very bad weather |
| Key West in september | very bad weather |
| Marco Island in september | very bad weather |
| Boynton Beach in september | very bad weather |
| Naples in september | very bad weather |
| West Palm Beach in september | very bad weather |
Click over cities on the map for information about the weather in september.
Key Largo
perfect weather
good
tolerable
bad
very bad
Weather data for Key Largo in september:
Weather data for Key Largo for september are derived from an average of the weather forecast since 2009 in Key Largo. There is a margin of error and these forecasts are to be considered as general information only. The weather in Key Largo can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Key Largo.