Measurements:
°C
°F
CURRENT WEATHER
06:04
San Juan
82°F
W 9 mph
Feels like: 86°F
Precip: 0%
World Resorts Puerto Rico San Juan Weather

7 Day Weather Forecast

12.17
wed
DAY
84°F
W 14 mph
precip
0%
NIGHT
80°F
NW 6 mph
precip
0%
12.18
thu
DAY
84°F
W 13 mph
precip
100%
NIGHT
82°F
W 12 mph
precip
0%
12.19
fri
DAY
86°F
W 15 mph
precip
0%
NIGHT
80°F
W 9 mph
precip
79%
12.20
sat
DAY
86°F
W 14 mph
precip
83%
NIGHT
80°F
W 13 mph
precip
100%
12.21
sun
DAY
84°F
W 17 mph
precip
78%
NIGHT
78°F
W 13 mph
precip
100%
12.22
mon
DAY
84°F
W 14 mph
precip
100%
NIGHT
78°F
W 9 mph
precip
60%
12.23
tue
DAY
84°F
SW 12 mph
precip
100%
NIGHT
78°F
SW 12 mph
precip
100%

San Juan Sea Water Temperature in December, °F

Select Year: 2025 2024 2023

The average sea surface temperature in December 2025 for San Juan was 28.4°F. The maximum and minimum values were 28.1°F and 28.7°F respectively.

San Juan on the Weather Map

Best Time to Visit San Juan
The most sunny months:
June 10 days
March 10 days
April 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
February 12 mph
June 12 mph
more details