26.08
wed
wed
Day
73°F
SW 6 mph
Precip.
23%
23%
Night
61°F
W 4 mph
Precip.
41%
41%
27.08
thu
thu
Day
73°F
SW 6 mph
Precip.
48%
48%
Night
63°F
SW 6 mph
Precip.
32%
32%
28.08
fri
fri
Day
70°F
SW 7 mph
Precip.
28%
28%
Night
61°F
SW 5 mph
Precip.
39%
39%
29.08
sat
sat
Day
68°F
SW 6 mph
Precip.
72%
72%
Night
63°F
W 4 mph
Precip.
64%
64%
30.08
sun
sun
Day
70°F
SW 6 mph
Precip.
59%
59%
Night
61°F
W 4 mph
Precip.
35%
35%
31.08
mon
mon
Day
75°F
SW 7 mph
Precip.
17%
17%
Night
61°F
SW 4 mph
Precip.
42%
42%
01.09
tue
tue
Day
73°F
SW 2 mph
Precip.
13%
13%
Night
59°F
NW 1 mph
Precip.
42%
42%
02.09
wed
wed
Day
73°F
SW 5 mph
Precip.
31%
31%
Night
63°F
W 2 mph
Precip.
38%
38%
03.09
thu
thu
Day
72°F
SW 4 mph
Precip.
36%
36%
Night
63°F
SW 3 mph
Precip.
44%
44%
04.09
fri
fri
Day
75°F
SW 6 mph
Precip.
17%
17%
Night
63°F
W 4 mph
Precip.
43%
43%
05.09
sat
sat
Day
68°F
SW 5 mph
Precip.
75%
75%
Night
61°F
SW 2 mph
Precip.
39%
39%
06.09
sun
sun
Day
70°F
SW 4 mph
Precip.
53%
53%
Night
63°F
NE 1 mph
Precip.
93%
93%
07.09
mon
mon
Day
63°F
S 1 mph
Precip.
47%
47%
Night
61°F
N 2 mph
Precip.
38%
38%
08.09
tue
tue
Day
68°F
S 3 mph
Precip.
37%
37%
Night
63°F
SW 2 mph
Precip.
54%
54%
sea water
temperature
temperature
| San Jose |
monthly
weather
weather
| San Jose |
current
weather
weather
| San Jose |
7 days
forecast
forecast
| San Jose |
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 86.9°F. The highest and lowest sea temperatures during the month were 87.8°F and 86.2°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 83.8°F. The highest and lowest sea temperatures during the month were 84.4°F and 83.3°F.
Air temperature in San Jose, °F
Precipitation total in San Jose, in.
* Charts above show average data for the last 3 years.
Best time for vacation in San Jose
San Jose on a weather map
Places in Costa Rica:
Name
°F
24 Hours Forecast
San Jose
Local time: 21:48
August 27, thursday
0000
61°F
W
4 mph
4 mph
0300
61°F
SW
4 mph
4 mph
0600
63°F
SW
5 mph
5 mph
0900
68°F
SW
6 mph
6 mph
1200
73°F
SW
6 mph
6 mph
1500
72°F
SW
6 mph
6 mph
1800
64°F
SW
5 mph
5 mph
2100
63°F
SW
6 mph
6 mph
