Measurements:
°C
°F
CURRENT WEATHER
16:58
San Juan
88°F
W 14 mph
Feels like: 96°F
Precip: 22%
World Resorts Puerto Rico San Juan Weather

7 Day Weather Forecast

09.08
tue
DAY
90°F
W 16 mph
precip
12%
NIGHT
84°F
W 15 mph
precip
28%
09.09
wed
DAY
90°F
W 17 mph
precip
20%
NIGHT
84°F
W 15 mph
precip
23%
09.10
thu
DAY
90°F
W 16 mph
precip
36%
NIGHT
84°F
NW 12 mph
precip
24%
09.11
fri
DAY
90°F
W 16 mph
precip
14%
NIGHT
86°F
W 13 mph
precip
41%
09.12
sat
DAY
90°F
W 16 mph
precip
13%
NIGHT
86°F
W 16 mph
precip
18%
09.13
sun
DAY
90°F
W 16 mph
precip
22%
NIGHT
84°F
W 14 mph
precip
32%
09.14
mon
DAY
90°F
W 16 mph
precip
10%
NIGHT
84°F
W 12 mph
precip
28%

San Juan Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for San Juan was 29.9°F. The maximum and minimum values were 29.6°F and 30.2°F respectively.

San Juan on the Weather Map

Best Time to Visit San Juan
The most sunny months:
June 9 days
March 9 days
October 9 days
The most warm months:
September 91.1 °F
August 91.0 °F
July 90.6 °F
Warmest sea temperature:
October 88.8 °F
September 88.8 °F
August 87.8 °F
The most cold months:
February 84.0 °F
January 84.2 °F
March 84.7 °F
The most rainy months:
October 5 days
September 4 days
November 4 days
The most windy months:
July 12 mph
August 12 mph
June 12 mph
more details