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:
2026
2025
2024

The average sea water temperature in September of 2026 was 85.1°F. The highest and lowest sea temperatures during the month were 85.5°F and 84.2°F.

Monthly sea water temperature in San Juan, °F

Which Puerto Rico resorts have warmest sea in September?

Place name September 2026 September 2025
Mayaguez 85.7°F 86.1°F
Ponce 85.7°F 86.3°F
Aguadilla 85.5°F 86.1°F
Isabella 85.3°F 85.9°F
Arecibo 85.3°F 85.8°F
San Juan 85.1°F 85.7°F

Best time for vacation in San Juan

Sunniest months:
June 9 days
March 9 days
October 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 81.2 °F
Rainiest months:
October 5 days
September 4 days
November 4 days
Windiest months:
July 12.6 mph
August 11.9 mph
June 11.9 mph

San Juan on a weather map

Current weather
01:38
San Juan
+81°F
NW 15 mph
Feels like: +88°F
Precip.: 25%
Places in Puerto Rico:
Name
°F
Aguadilla
+82°F
Arecibo
+79°F
Isabella
+77°F
Mayaguez
+82°F
Ponce
+79°F
San Juan
+81°F
24 Hours Forecast
San Juan
Local time: 01:38
September 17, thursday
0300
81°F
NW
15 mph
0600
81°F
NW
12 mph
0900
84°F
NW
14 mph
1200
88°F
NW
16 mph
1500
88°F
W
14 mph
1800
82°F
W
14 mph
2100
82°F
W
11 mph
September 18, friday
0000
81°F
NW
10 mph
Units of measurement: °C / °F