Key West FL Recent September Temperatures, 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

September temperature averages by year in Key West
High °F	Low °F	Year	High °C	Low °C
90	81	2023	32	27
89	78	2022	31	26
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
2023	30	17
2022	30	8
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

Rain

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
16	2023	8.8	223
15	2022	12.1	307
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

Key West - Recent September Temperatures and Rainfall

Temperature

Rain

Reference

More on Weather in Key West