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Coldest sea in Puerto Rico in September

73 coastal locations in Puerto Rico ranked by typical September sea temperature, coldest first. Region-wide average in September: 29.7°C.

Coldest in September

Culebra

29.4°C September mean in Puerto Rico

Regional September average

29.7°C

across all 73 coastal locations in Puerto Rico

Vs annual mean

+1.4°C

above the year-round regional average

What the Puerto Rico sea feels like in September

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

Puerto Rico monthly average 26.9°C to 29.7°C
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  • Warmest month September 29.7°C
  • Coldest month February 26.9°C
  • Annual mean 28.3°C
  • Months above 20°C 12 of 12

Where September fits in the year

September sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve Puerto Rico month rankings:

Puerto Rico sea temperature map (live)

The map shows today's latest reading at every Puerto Rico location. The list below is based on the typical September mean.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 coldest Puerto Rico locations in September

Sorted by typical September mean from a decade of daily readings, coldest first. Click any place for the full location page.

# Location September mean
1 Culebra 29.4°C
2 Flamenco Beach 29.4°C
3 Bayamn 29.4°C
4 Carolina 29.4°C
5 Catano 29.4°C
6 Isla Verde 29.4°C
7 Levittown 29.4°C
8 Loiza 29.4°C
9 San Juan 29.4°C
10 Fajardo 29.4°C
11 Luquillo 29.4°C
12 Playa Fortuna 29.4°C
13 Arecibo 29.5°C
14 Esperanza 29.5°C
15 Isabel Segunda 29.5°C
16 Vieques 29.5°C
17 Jobos 29.5°C
18 Carrizales 29.5°C
19 Hatillo 29.5°C
20 Aguadilla 29.6°C
21 Isabela 29.6°C
22 La Playa 29.6°C
23 Rincon 29.6°C
24 Lamboglia 29.6°C
25 Bayamón Bayamón 29.6°C
Show 25 more ▸
26 San Juan, La Puntilla, San Juan Bay, Puerto Rico San Juan 29.6°C
27 Arroyo 29.6°C
28 Central Aguirre 29.6°C
29 Culebrita, Isla, Puerto Rico Culebra 29.6°C
30 Emajagua 29.6°C
31 Palmas 29.6°C
32 Punta Santiago 29.6°C
33 Culebra, Puerto Rico Culebra 29.6°C
34 Ensenada Honda, Culebra Island, Puerto Rico Culebra 29.6°C
35 Jauca 29.6°C
36 Playita Cortada 29.6°C
37 Potala Pastillo 29.6°C
38 Fajardo, Puerto Rico Fajardo 29.7°C
39 Isla Palominos, Puerto Rico Fajardo 29.7°C
40 Playa de Fajardo, Puerto Rico Fajardo 29.7°C
41 Mona Island, Puerto Rico Mayagüez 29.7°C
42 Tallaboa 29.7°C
43 Esperanza, Vieques Island, Puerto Rico Vieques 29.7°C
44 Puerto Ferro, Isla de Vieques, Puerto Rico Vieques 29.7°C
45 Punta Mulas, Isla de Vieques, Puerto Rico Vieques 29.7°C
46 Naguabo, Puerto Rico Naguabo 29.7°C
47 Roosevelt Roads, Puerto Rico Ceiba 29.7°C
48 Ponce 29.7°C
49 Aguadilla, Crashboat Beach, Puerto Rico Aguadilla 29.7°C
50 Boqueron 29.7°C

Warmest 10 in Puerto Rico in September

Same data the other way. The warmest spots for the same month.

# Location September mean
1 Mayagüez, Puerto Rico Mayagüez 29.9°C
2 Puerto Real, Puerto Rico (sub) Cabo Rojo 29.9°C
3 Punta Guanajibo, Mayagüez, Puerto Rico Cabo Rojo 29.9°C
4 Guanica, Puerto Rico Guánica 29.9°C
5 Peñuelas (Punta Guayanilla), Puerto Rico Peñuelas 29.9°C
6 Bahía Salinas, Puerto Rico Cabo Rojo 29.9°C
7 Magueyes Island, Caribbean Sea, Puerto Rico Lajas 29.9°C
8 Playa de Ponce, Puerto Rico Ponce 29.9°C
9 Puerto Ponce Ponce 29.9°C
10 Capitanejo Juana Díaz 29.8°C

More on this region