World Resorts Puerto Rico San Juan Weather

San Juan Sea Temperature in September

Average sea water temperature in September:
+84.9°F
Minimum sea water temperature in September: 87.8°F
Maximum sea water temperature in September: 82.6°F

Daily sea water temperature in September, °F

Show year:
2025
2024
2023

The average sea water temperature in September of 2025 was 85.7°F. The highest and lowest sea temperatures during the month were 86.4°F and 85.3°F.

Monthly sea water temperature in San Juan, °F

Which Puerto Rico resorts have warmest sea in September?

Place name September 2025 September 2024
Ponce 86.3°F 87.0°F
Aguadilla 86.1°F 86.6°F
Mayaguez 86.1°F 86.8°F
Isabella 85.9°F 86.4°F
Arecibo 85.8°F 86.3°F
San Juan 85.7°F 86.4°F

Best time for vacation in San Juan

Sunniest months:
June 10 days
March 10 days
April 9 days
Warmest months:
September 87.0 °F
August 86.9 °F
July 86.5 °F
Warmest sea temp:
October 84.9 °F
September 84.9 °F
August 84.0 °F
Coldest months:
February 80.6 °F
January 80.8 °F
March 81.3 °F
Rainiest months:
October 5 days
September 4 days
November 4 days
Windiest months:
July 12.6 mph
February 12.0 mph
June 11.8 mph

San Juan on a weather map

Current weather
03:36
San Juan
+79°F
NW 7 mph
Feels like: +84°F
Precip.: 0%
Places in Puerto Rico:
Name
°F
Aguadilla
+72°F
Arecibo
+73°F
Isabella
+73°F
Mayaguez
+72°F
Ponce
+73°F
San Juan
+79°F
24 Hours Forecast
San Juan
Local time: 03:36
December 05, friday
0600
77°F
NW
6 mph
0900
79°F
W
9 mph
1200
82°F
W
16 mph
1500
81°F
W
14 mph
1800
79°F
W
11 mph
2100
79°F
W
11 mph
December 06, saturday
0000
79°F
W
12 mph
0300
79°F
NW
10 mph
Units of measurement: °C / °F