29.12
mon
mon
Day
79°F
SW 9 mph
Precip.
0%
0%
Night
73°F
W 7 mph
Precip.
0%
0%
30.12
tue
tue
Day
79°F
W 9 mph
Precip.
100%
100%
Night
73°F
NW 6 mph
Precip.
0%
0%
31.12
wed
wed
Day
77°F
W 9 mph
Precip.
0%
0%
Night
75°F
NW 7 mph
Precip.
0%
0%
01.01
thu
thu
Day
81°F
W 11 mph
Precip.
0%
0%
Night
75°F
W 8 mph
Precip.
0%
0%
02.01
fri
fri
Day
79°F
W 12 mph
Precip.
27%
27%
Night
73°F
NW 6 mph
Precip.
0%
0%
03.01
sat
sat
Day
79°F
W 9 mph
Precip.
100%
100%
Night
73°F
NW 6 mph
Precip.
23%
23%
04.01
sun
sun
Day
81°F
W 8 mph
Precip.
0%
0%
Night
73°F
NW 5 mph
Precip.
25%
25%
05.01
mon
mon
Day
79°F
SW 5 mph
Precip.
30%
30%
Night
73°F
NW 6 mph
Precip.
0%
0%
06.01
tue
tue
Day
79°F
NE 4 mph
Precip.
100%
100%
Night
72°F
NE 2 mph
Precip.
100%
100%
07.01
wed
wed
Day
75°F
W 6 mph
Precip.
100%
100%
Night
72°F
W 4 mph
Precip.
56%
56%
08.01
thu
thu
Day
77°F
W 8 mph
Precip.
28%
28%
Night
73°F
NW 7 mph
Precip.
72%
72%
09.01
fri
fri
Day
81°F
W 9 mph
Precip.
72%
72%
Night
73°F
NW 6 mph
Precip.
41%
41%
10.01
sat
sat
Day
81°F
W 12 mph
Precip.
51%
51%
Night
75°F
W 10 mph
Precip.
100%
100%
11.01
sun
sun
Day
81°F
W 16 mph
Precip.
100%
100%
Night
75°F
W 14 mph
Precip.
100%
100%
sea water
temperature
temperature
| San Juan |
monthly
weather
weather
| San Juan |
current
weather
weather
| San Juan |
7 days
forecast
forecast
| San Juan |
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 82.8°F. The highest and lowest sea temperatures during the month were 83.7°F and 81.7°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 81.5°F. The highest and lowest sea temperatures during the month were 82.4°F and 80.8°F.
Air temperature in San Juan, °F
Precipitation total in San Juan, in.
* Charts above show average data for the last 3 years.
Best time for vacation in San Juan
San Juan on a weather map
Places in Puerto Rico:
Name
°F
24 Hours Forecast
San Juan
Local time: 09:30
December 29, monday
1200
79°F
SW
9 mph
9 mph
1500
77°F
SW
11 mph
11 mph
1800
77°F
W
11 mph
11 mph
2100
75°F
W
9 mph
9 mph
December 30, tuesday
0000
73°F
W
7 mph
7 mph
0300
73°F
W
6 mph
6 mph
0600
73°F
NW
4 mph
4 mph
0900
75°F
NW
5 mph
5 mph
