Key West - Recent September Temperatures and Rainfall





The numbers here describe what the September weather in Key West, Florida was like for every year since 2010. A series of tables gives September data by year for temperature and precipitation.

They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. That's followed by how many really hot days occurred each September. Then there's information on how much rain actually landed this month during recent years, as well as how often Key West had wet weather.

The climate data come from weather measurements made at the Key West International Airport.

Temperature Weather iconTemperature

September temperature averages by year in Key West
High °F Low °F Year High °C Low °C
88 79 2021 31 26
90 81 2020 32 27
89 80 2019 32 27
90 82 2018 32 28
89 80 2017 32 27
89 79 2016 31 26
89 81 2015 32 27
88 79 2014 31 26
87 79 2013 31 26
87 78 2012 30 25
89 81 2011 32 27
88 79 2010 31 26
Number of days in September when the temperature in Key West rose to at least 70 or 90 degrees Fahrenheit
Year 70 °F
21 °C
90 °F
32 °C
2021 30 7
2020 30 14
2019 30 11
2018 30 19
2017 30 15
2016 30 11
2015 30 14
2014 30 5
2013 30 1
2012 30 1
2011 30 11
2010 30 2

Rainy Weather iconRain

This table gives the total precipitation that fell on Key West during September in each year from 2010. The number of days with precipitation counts the days when rainfall amounted to 0.01 inches (0.3 millimeters) or more.

Total rainfall for September in Key West
Days Year Inches Milli­metres
15 2021 2.5 64
14 2020 12.2 310
14 2019 4.1 104
13 2018 6.1 154
12 2017 9.3 236
14 2016 8.1 204
16 2015 6.3 161
15 2014 5.4 138
11 2013 4.8 122
15 2012 5.5 141
11 2011 7.3 185
17 2010 8.9 227
Reference

Jay Lawrimore. 2016. Global Summary of the Month, Version 1.0. NOAA National Centers for Environmental Information. 

Key West - Recent Years
Key West - Extremes
Back to Top