16.09
wed
wed
Day
73°F
SW 2 mph
Precip.
57%
57%
Night
59°F
SW 6 mph
Precip.
27%
27%
17.09
thu
thu
Day
70°F
S 2 mph
Precip.
59%
59%
Night
61°F
SW 4 mph
Precip.
27%
27%
18.09
fri
fri
Day
70°F
E 3 mph
Precip.
44%
44%
Night
63°F
SW 4 mph
Precip.
29%
29%
19.09
sat
sat
Day
72°F
E 4 mph
Precip.
40%
40%
Night
63°F
W 2 mph
Precip.
38%
38%
20.09
sun
sun
Day
70°F
E 4 mph
Precip.
77%
77%
Night
63°F
N 2 mph
Precip.
60%
60%
21.09
mon
mon
Day
70°F
NE 4 mph
Precip.
59%
59%
Night
61°F
W 4 mph
Precip.
38%
38%
22.09
tue
tue
Day
64°F
NE 2 mph
Precip.
52%
52%
Night
61°F
N 2 mph
Precip.
48%
48%
23.09
wed
wed
Day
64°F
E 2 mph
Precip.
46%
46%
Night
63°F
N 2 mph
Precip.
72%
72%
24.09
thu
thu
Day
64°F
NE 2 mph
Precip.
71%
71%
Night
63°F
N 2 mph
Precip.
92%
92%
25.09
fri
fri
Day
61°F
NE 4 mph
Precip.
88%
88%
Night
59°F
NE 2 mph
Precip.
46%
46%
26.09
sat
sat
Day
63°F
W 2 mph
Precip.
34%
34%
Night
59°F
NW 2 mph
Precip.
25%
25%
27.09
sun
sun
Day
75°F
E 6 mph
Precip.
13%
13%
Night
61°F
SW 3 mph
Precip.
39%
39%
28.09
mon
mon
Day
72°F
E 4 mph
Precip.
67%
67%
Night
61°F
W 2 mph
Precip.
38%
38%
29.09
tue
tue
Day
68°F
NE 3 mph
Precip.
67%
67%
Night
61°F
N 1 mph
Precip.
89%
89%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 86.4°F. The highest and lowest sea temperatures during the month were 86.9°F and 85.3°F.
Air temperature in Cartago, °F
Precipitation total in Cartago, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Cartago
Cartago on a weather map
Places in Costa Rica:
Name
°F
24 Hours Forecast
Cartago
Local time: 08:59
September 16, wednesday
0900
70°F
SW
3 mph
3 mph
1200
73°F
SW
2 mph
2 mph
1500
66°F
SW
4 mph
4 mph
1800
61°F
SW
5 mph
5 mph
2100
61°F
SW
7 mph
7 mph
September 17, thursday
0000
59°F
SW
6 mph
6 mph
0300
59°F
SW
6 mph
6 mph
0600
61°F
W
6 mph
6 mph
