16.05
sat
sat
Day
84°F
W 15 mph
Precip.
100%
100%
Night
77°F
W 11 mph
Precip.
0%
0%
17.05
sun
sun
Day
84°F
W 16 mph
Precip.
79%
79%
Night
77°F
W 12 mph
Precip.
72%
72%
18.05
mon
mon
Day
84°F
W 16 mph
Precip.
0%
0%
Night
77°F
W 11 mph
Precip.
100%
100%
19.05
tue
tue
Day
84°F
W 16 mph
Precip.
77%
77%
Night
77°F
W 11 mph
Precip.
70%
70%
20.05
wed
wed
Day
84°F
W 17 mph
Precip.
79%
79%
Night
77°F
NW 9 mph
Precip.
67%
67%
21.05
thu
thu
Day
84°F
W 16 mph
Precip.
29%
29%
Night
77°F
NW 9 mph
Precip.
28%
28%
22.05
fri
fri
Day
84°F
W 16 mph
Precip.
0%
0%
Night
77°F
W 11 mph
Precip.
52%
52%
23.05
sat
sat
Day
84°F
W 17 mph
Precip.
79%
79%
Night
77°F
W 13 mph
Precip.
71%
71%
24.05
sun
sun
Day
84°F
W 18 mph
Precip.
22%
22%
Night
77°F
W 12 mph
Precip.
78%
78%
25.05
mon
mon
Day
84°F
W 17 mph
Precip.
100%
100%
Night
77°F
W 11 mph
Precip.
86%
86%
26.05
tue
tue
Day
84°F
W 16 mph
Precip.
100%
100%
Night
77°F
NW 8 mph
Precip.
20%
20%
27.05
wed
wed
Day
84°F
W 13 mph
Precip.
21%
21%
Night
77°F
NW 9 mph
Precip.
100%
100%
28.05
thu
thu
Day
84°F
W 14 mph
Precip.
100%
100%
Night
77°F
NW 12 mph
Precip.
68%
68%
29.05
fri
fri
Day
82°F
W 14 mph
Precip.
63%
63%
Night
79°F
NW 10 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 May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 82.1°F. The highest and lowest sea temperatures during the month were 82.6°F and 81.5°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: 18:30
May 16, saturday
2100
79°F
W
11 mph
11 mph
May 17, sunday
0000
77°F
W
11 mph
11 mph
0300
77°F
W
11 mph
11 mph
0600
77°F
NW
10 mph
10 mph
0900
82°F
W
12 mph
12 mph
1200
84°F
W
16 mph
16 mph
1500
84°F
W
17 mph
17 mph
1800
81°F
W
15 mph
15 mph
