Marathon, FL: September

30 September 2026: September 2026 averaged 84.1°F in Marathon, FL, the warmest September since 2024, tied 21st warmest of 66 (with 2007, 2005 and 2004).

September 2026

Mean temperature: 84.1°F; Warmest since 2024; 21st warmest of 66
Precipitation: 4.98 in; Driest since 2024; 28th driest of 66

A normal September in Marathon, FL (1991 to 2020): a mean temperature of 84.2°F, between 82.8°F and 84.9°F in eight years of ten and 5.41 in of precipitation, between 2.94 in and 10.58 in in eight years of ten.

The mean temperature of every September in Marathon, FL since 1950: 84.1°F in 2026; the highest is 86.5°F, in 2023.

Normal range, 82.8 to 84.9°F

Every year, ranked, as a table

Every September in Marathon, FL from 1950 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank	Days missing
2026	84.1	21	88.5	50	79.8	8	4.98	38	0
2025	83.1	40	88.2	55	77.9	32	9.26	11	0
2024	85.9	3	90.3	13	81.5	1	3.18	53	0
2023	86.5	1	92.9	1	80.1	7	7.49	17	0
2022	85.9	3	92.2	2	79.6	12	6.80	25	0
2021	83.1	40	89.1	35	77.1	45	4.67	42	0
2020	84.8	10	89.8	20	79.8	8	10.20	7	0
2019	84.8	10	90	16	79.5	14	2.92	57	0
2018	84.8	10	90.5	8	79.1	16	1.71	65	0
2017	84.7	14	89.8	20	79.6	12			2
2016	84.6	16	90.3	13	78.9	20	3.78	48	0
2015	84.7	14	90.5	8	78.9	20	7.12	24	0
2014	83.5	31	89.1	35	77.8	35	5.19	36	0
2013	84.3	17	89.8	20	78.8	22	3.16	54	0
2012	84.2	19	89.5	29	78.8	22	4.77	40	0
2011	85.1	7	91	5	79.2	15	2.95	56	0
2010	83.9	26	89.1	35	78.6	26	13.71	2	0
2009	84.2	19	89.7	24	78.7	24	7.13	22	0
2008	83.2	35	88.1	56	78.2	28	7.44	19	1
2007	84.1	21	90.4	11	77.9	32	12.08	5	0
2006	84.8	10	91	5	78.7	24	3.62	50	0
2005	84.1	21	89.7	24	78.5	27	4.98	38	0
2004	84.1	21	89.1	35	79.1	16	4.25	45	2
2003	84.3	17	89.6	27	79	18	3.49	52	0
2002	85.7	5	91.1	4	80.2	5	7.26	20	0
2001	82.8	46	88.6	48	77	47	9.28	10	0
2000	85.4	6	90.4	11	80.4	4	3.79	47	3
1999	83.3	33	88.9	42	77.6	37	8.19	14	0
1998	84.9	9	89.7	24	80.2	5	3.59	51	2
1997	80.9	63	85.9	63	75.9	57	7.45	18	0
1996	83.1	40	88.7	45	77.4	40	5.87	29	0
1995	83.7	28	89.2	33	78.1	29	2.71	60	0
1994	82.2	56	87.4	58	76.9	49	13.47	3	1
1993	82.7	47	88.1	56	77.2	44	7.18	21	0
1992	83.2	35	88.4	52	78	30	5.41	34	0
1991	83.6	29	89.2	33	77.9	32	9.40	9	0
1990	82	58	86.7	61	77.1	45	6.10	27	1
1989	85	8	88.7	45	81.2	2	2.05	61	0
1988	82.7	47	88.8	44	76.5	53	4.74	41	0
1987	86	2	90.8	7	81.2	2	5.60	31	0
1986	83.2	35	86.7	61	79.7	11	2.02	63	0
1985	81.8	60	85.9	63	77.7	36	7.13	22	0
1984	81.6	62	85.7	65	77.5	39	8.77	12	0
1983	82.5	52	87	60	78	30	2.96	55	0
1982	82.6	50	85.3	66	79.8	8	2.82	58	0
1974	84	25	89	39	79	18	1.78	64	0
1972	82.9	45	89	39	76.7	51	3.96	46	0
1971	83.4	32	89.4	30	77.4	40	4.51	43	0
1970	82.6	50	89.9	18	75.3	58	5.44	33	0
1969	82.7	47	88.4	52	77	47	7.65	16	1
1968	83.1	40	90.1	15	76.1	55	8.26	13	0
1966	83.2	35	89.8	20	76.6	52	8.05	15	1
1965							3.78	48	9
1964	83.3	33	89.3	32	77.4	40	4.26	44	0
1963	83.1	40	89.4	30	76.8	50	9.50	8	0
1962	82.3	55	88.5	50	76.1	55	5.45	32	0
1961	83.8	27	89.9	18	77.6	37	0.22	66	0
1959	81.7	61	88.4	52	74.9	61	19.59	1	0
1958	83.2	35	89	39	77.3	43	5.03	37	0
1957	82	58	88.7	45	75.3	58	5.39	35	0
1956	79.7	66	87.4	58	72	65	11.88	6	0
1955	82.1	57	90	16	74.2	63	5.71	30	0
1954	80.7	64	88.9	42	72.6	64	5.88	28	0
1953	80.7	64	89.6	27	71.8	66	13.16	4	0
1952	82.4	53	90.5	8	74.4	62	2.77	59	0
1951	83.6	29	91.9	3	75.3	58	2.05	61	0
1950	82.4	53	88.6	48	76.2	54	6.48	26	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2023	86.5
1987	86
2024	85.9
2022	85.9
2002	85.7
2000	85.4
2011	85.1
1989	85
1998	84.9
2020	84.8
More years share the last value

Coldest
Year	Mean, °F
1956	79.7
1954	80.7
1953	80.7
1997	80.9
1984	81.6
1959	81.7
1985	81.8
1990	82
1957	82
1955	82.1

Wettest
Year	Precipitation, in
1959	19.59
2010	13.71
1994	13.47
1953	13.16
2007	12.08
1956	11.88
2020	10.20
1963	9.50
1991	9.40
2001	9.28

Driest
Year	Precipitation, in
1961	0.22
2018	1.71
1974	1.78
1986	2.02
1989	2.05
1951	2.05
1995	2.71
1952	2.77
1982	2.82
2019	2.92

The hottest, coldest and wettest days

Hottest day: 92°F; 1 September 2026
Coldest night: 73°F; 29 September 2026
Wettest day: 1.85 in; 29 September 2026

Every month, season and year

Months

Seasons

Years

Marathon, FL the day's answers

All-time records

Every answer in words

September 2026 brought 4.98 in of precipitation in Marathon, FL, the driest September since 2024, tied 28th driest of 66 (with 2005).
The hottest day of September 2026 in Marathon, FL: 92°F on Tuesday 1 September 2026.
The coldest night of September 2026 in Marathon, FL: a low of 73°F on Tuesday 29 September 2026.
The wettest day of September 2026 in Marathon, FL: 1.85 in on Tuesday 29 September 2026.