Measurements:
°C
°F
CURRENT WEATHER
18:38
San Juan
88°F
W 14 mph
Feels like: 98°F
Precip: 8%
World Resorts Puerto Rico San Juan Weather

7 Day Weather Forecast

09.28
mon
DAY
92°F
W 12 mph
precip
14%
NIGHT
86°F
W 12 mph
precip
22%
09.29
tue
DAY
90°F
W 14 mph
precip
6%
NIGHT
84°F
W 14 mph
precip
22%
09.30
wed
DAY
90°F
W 15 mph
precip
11%
NIGHT
84°F
W 12 mph
precip
26%
10.01
thu
DAY
90°F
W 17 mph
precip
4%
NIGHT
84°F
W 12 mph
precip
21%
10.02
fri
DAY
90°F
W 16 mph
precip
5%
NIGHT
86°F
W 10 mph
precip
20%
10.03
sat
DAY
90°F
W 14 mph
precip
13%
NIGHT
84°F
NW 10 mph
precip
18%
10.04
sun
DAY
90°F
W 14 mph
precip
4%
NIGHT
86°F
W 12 mph
precip
18%

San Juan Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for San Juan was 29.7°F. The maximum and minimum values were 29.0°F and 30.1°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:
September 88.8 °F
October 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
November 4 days
August 3 days
The most windy months:
July 12 mph
August 12 mph
June 12 mph
more details