Where the sea is warmest in September

1,570 of 2,330 mapped beaches average 20 °C or more this month. Every figure is a measurement, not an estimate.

#	Beach	Country	Sep °C	Warmest month
1	Inland Sea Beach	🇶🇦 Qatar	33.3	Aug 34.1 °C
2	Sealine Beach	🇶🇦 Qatar	33.2	Aug 34.1 °C
3	Jumeirah Beach	🇦🇪 United Arab Emirates	32.7	Aug 33.5 °C
4	Fuwairit Beach	🇶🇦 Qatar	32.7	Aug 33.6 °C
5	Al Maroona Beach	🇶🇦 Qatar	32.7	Aug 33.6 °C
6	Umm Bab Beach	🇶🇦 Qatar	32.6	Aug 33.5 °C
7	Ajman Beach	🇦🇪 United Arab Emirates	32.5	Aug 33.2 °C
8	Red Beach	🇮🇷 Iran	31.7	Aug 32.6 °C
9	Playa Girón	🇨🇺 Cuba	30	Aug 30.2 °C
10	Playa de Guayabitos	🇲🇽 Mexico	30	Aug 30.3 °C
11	Playa Majahua	🇲🇽 Mexico	30	Aug 30.4 °C
12	Playa Tlacopanocha	🇲🇽 Mexico	30	Aug 30.4 °C
13	Acapulco Diamante	🇲🇽 Mexico	30	Aug 30.4 °C
14	Playa Langosta	🇲🇽 Mexico	30	Aug 30.4 °C
15	Playa El Tamarindo	🇸🇻 El Salvador	30	Aug 30.3 °C
16	Playa Pie de La Cuesta	🇲🇽 Mexico	30	Aug 30.4 °C
17	Barra Vieja Beach	🇲🇽 Mexico	29.9	Aug 30.4 °C
18	Playa San Pancho	🇲🇽 Mexico	29.9	Aug 30.2 °C
19	Playa de los Muertos	🇲🇽 Mexico	29.9	Aug 30.2 °C
20	Playa Sayulita	🇲🇽 Mexico	29.9	Aug 30.2 °C
21	Playa la Ropa	🇲🇽 Mexico	29.9	Aug 30.3 °C
22	Playa Las Gatas	🇲🇽 Mexico	29.9	Aug 30.3 °C
23	Hedonism Resorts	🇯🇲 Jamaica	29.8	Sep 29.8 °C
24	Los Muertos Beach	🇲🇽 Mexico	29.8	Aug 30.1 °C
25	Playa Zicatela	🇲🇽 Mexico	29.8	Aug 30.2 °C
26	Doctor's Cave Beach Club	🇯🇲 Jamaica	29.8	Sep 29.8 °C
27	Anse d'Azur	🇭🇹 Haiti	29.8	Sep 29.8 °C
28	Tanjung Aru Beach	🇲🇾 Malaysia	29.8	Jun 30.2 °C
29	Osuka Beach	🇲🇾 Malaysia	29.8	Jun 30.3 °C
30	Playa Siboney	🇨🇺 Cuba	29.8	Sep 29.8 °C
31	Playa Daiquirí	🇨🇺 Cuba	29.8	Sep 29.8 °C
32	Playa Damajayabo	🇨🇺 Cuba	29.8	Sep 29.8 °C
33	Batu Ferringhi	🇲🇾 Malaysia	29.7	Jun 30.5 °C
34	Seven Mile Beach	🇬🇧 United Kingdom	29.7	Aug 29.7 °C
35	La Ventanilla	🇲🇽 Mexico	29.7	Aug 30 °C
36	Bluefields Beach	🇯🇲 Jamaica	29.7	Sep 29.7 °C
37	Whitehouse Beach	🇯🇲 Jamaica	29.7	Sep 29.7 °C
38	Mermejita	🇲🇽 Mexico	29.7	Aug 30 °C
39	Black Sand Beach	🇲🇾 Malaysia	29.7	May 30.5 °C
40	Tanjung Rhu	🇲🇾 Malaysia	29.7	May 30.5 °C
41	Ocean View Beach	🇯🇲 Jamaica	29.7	Sep 29.7 °C
42	Playa Unión (Raa Bidxi)	🇲🇽 Mexico	29.7	Aug 30 °C
43	Playa Zipolite	🇲🇽 Mexico	29.7	Aug 30 °C
44	Playa San Agustinillo	🇲🇽 Mexico	29.7	Aug 30 °C
45	Monterrico Beach	🇬🇹 Guatemala	29.7	Aug 30.1 °C
46	James Bond Beach	🇯🇲 Jamaica	29.6	Sep 29.6 °C
47	Talasari beach	🇮🇳 India	29.6	Jun 29.9 °C
48	Puteri Beach	🇲🇾 Malaysia	29.6	May 30.3 °C
49	Klebang Beach	🇲🇾 Malaysia	29.6	May 30.3 °C
50	Treasure Beach	🇯🇲 Jamaica	29.6	Sep 29.6 °C
51	Reggae Beach	🇯🇲 Jamaica	29.6	Sep 29.6 °C
52	Font Hill Beach	🇯🇲 Jamaica	29.6	Sep 29.6 °C
53	Tanjung Bidara Beach	🇲🇾 Malaysia	29.6	May 30.3 °C
54	Madale Beach	🇮🇩 Indonesia	29.6	Apr 30.1 °C
55	Cenang Beach	🇲🇾 Malaysia	29.6	May 30.4 °C
56	Pantai Tengah	🇲🇾 Malaysia	29.6	May 30.4 °C
57	Playa Tortuguilla	🇨🇺 Cuba	29.6	Sep 29.6 °C
58	Las Salinas Baitiquirí	🇨🇺 Cuba	29.6	Sep 29.6 °C
59	Playa San Diego	🇸🇻 El Salvador	29.6	Aug 30 °C
60	Romantic Beach	🇲🇾 Malaysia	29.6	Jun 30.4 °C
61	Adam and Eve Beach	🇲🇾 Malaysia	29.6	Jun 30.4 °C
62	Coral Bay Beach	🇲🇾 Malaysia	29.6	Jun 30.4 °C
63	Sam Son Beach	🇻🇳 Vietnam	29.5	Aug 30 °C
64	Hải Hòa Beach	🇻🇳 Vietnam	29.5	Aug 30 °C
65	Smathers Beach	🇺🇸 United States	29.5	Aug 30 °C
66	Narathat Beach	🇹🇭 Thailand	29.5	May 30.4 °C
67	জুনপুট সমুদ্র সৈকত	🇮🇳 India	29.5	Jun 29.8 °C
68	Minyak Beku Beach	🇲🇾 Malaysia	29.5	May 30.3 °C
69	Bang Saen	🇹🇭 Thailand	29.4	May 30.6 °C
70	Golden Beach, Puri	🇮🇳 India	29.4	Jun 29.4 °C
71	Chandrabhaga beach	🇮🇳 India	29.4	Oct 29.5 °C
72	Playa Baracoa	🇨🇺 Cuba	29.4	Aug 29.6 °C
73	Hat Puek Tian	🇹🇭 Thailand	29.4	May 30.5 °C
74	Playa de Chachalacas	🇲🇽 Mexico	29.4	Aug 29.5 °C
75	Hellshire Beach	🇯🇲 Jamaica	29.4	Sep 29.4 °C
76	Cetti Bay	🇺🇸 United States	29.4	Jul 29.4 °C
77	Asan Invasion Beach	🇺🇸 United States	29.4	Jul 29.4 °C
78	Chen Rio	🇲🇽 Mexico	29.4	Sep 29.4 °C
79	Agat Invasion Beach	🇺🇸 United States	29.4	Jul 29.4 °C
80	Amban Beach	🇮🇩 Indonesia	29.4	Oct 29.7 °C
81	Santa María del Mar, Havana	🇨🇺 Cuba	29.4	Aug 29.6 °C
82	Trinchera Beach	🇺🇸 United States	29.4	Jul 29.4 °C
83	Sugarman Beach	🇯🇲 Jamaica	29.4	Sep 29.4 °C
84	Tulum Beach	🇲🇽 Mexico	29.4	Sep 29.4 °C
85	Xcacel Beach	🇲🇽 Mexico	29.4	Sep 29.4 °C
86	Playa Paraiso, Tulum	🇲🇽 Mexico	29.4	Sep 29.4 °C
87	Jomtien	🇹🇭 Thailand	29.3	May 30.5 °C
88	Siesta Beach	🇺🇸 United States	29.3	Aug 30.1 °C
89	My Khe Beach	🇻🇳 Vietnam	29.3	Aug 29.7 °C
90	Mypadu Beach	🇮🇳 India	29.3	May 29.9 °C
91	Guanabo	🇨🇺 Cuba	29.3	Aug 29.5 °C
92	Nhat Le Beach	🇻🇳 Vietnam	29.3	Aug 29.6 °C
93	Pak Meng beach	🇹🇭 Thailand	29.3	May 30.4 °C
94	Crandon Park	🇺🇸 United States	29.3	Aug 29.7 °C
95	Mid-Beach	🇺🇸 United States	29.3	Aug 29.7 °C
96	Da Nhay Beach	🇻🇳 Vietnam	29.3	Aug 29.6 °C
97	Pasir Panjang Beach	🇮🇩 Indonesia	29.3	May 30.2 °C
98	Hua Hin beach	🇹🇭 Thailand	29.3	May 30.4 °C
99	Sa Huỳnh	🇻🇳 Vietnam	29.3	Aug 29.4 °C
100	Plage de Bảo Ninh	🇻🇳 Vietnam	29.3	Aug 29.6 °C

Questions

Where is the sea warmest in September?

Inland Sea Beach, Qatar, at 33.3 °C — the highest September mean among the 2,330 beaches this atlas measures.

How many beaches are warm enough to swim in September?

1,570 of 2,330 reach 20 °C or more as a monthly mean. Twenty degrees is the line used throughout this atlas, and it is stated rather than implied because a swimming season is an opinion dressed as a number unless the threshold is on the page.

Where do these numbers come from?

NOAA's OISST v2.1 monthly long-term mean for 1991 to 2020, on a 0.25° global grid, sampled at each beach's own coordinates. It is a satellite and buoy record, in the public domain, and nothing on this page is estimated or written by hand.