Average sea water temperature in September:
+83.7°F
| Minimum sea water temperature in September: | 86.5°F |
| Maximum sea water temperature in September: | 82.0°F |
Daily sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 83.7°F. The highest and lowest sea temperatures during the month were 84.2°F and 83.1°F.
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| Alajuela |
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Monthly sea water temperature in Alajuela, °F
Which Costa Rica resorts have warmest sea in September?
| Place name | September 2025 | September 2024 |
|---|---|---|
| Puerto Viejo de Talamanca | 84.7°F | 85.7°F |
| Limon | 84.6°F | 86.0°F |
| Puerto Limon | 84.6°F | 86.0°F |
| Cahuita | 84.6°F | 85.7°F |
| Tortuguero | 84.4°F | 85.8°F |
| Quepos | 83.9°F | 84.1°F |
| Cartago | 83.9°F | 84.1°F |
| Playas del Coco | 83.8°F | 84.9°F |
| Santa Teresa | 83.8°F | 84.0°F |
| Tamarindo | 83.8°F | 84.4°F |
| San Jose | 83.8°F | 84.2°F |
| Playa Flamingo | 83.8°F | 84.7°F |
| Jaco | 83.7°F | 84.1°F |
| El Roble | 83.7°F | 84.1°F |
| Alajuela | 83.7°F | 84.0°F |
| Heredia | 83.7°F | 84.1°F |
| Samara | 83.7°F | 84.2°F |
Best time for vacation in Alajuela
Alajuela on a weather map
Places in Costa Rica:
Name
°F
24 Hours Forecast
Alajuela
Local time: 14:45
December 30, tuesday
1500
77°F
SW
3 mph
3 mph
1800
63°F
SW
6 mph
6 mph
2100
57°F
SW
6 mph
6 mph
December 31, wednesday
0000
57°F
SW
6 mph
6 mph
0300
57°F
SW
6 mph
6 mph
0600
59°F
SW
5 mph
5 mph
0900
64°F
SW
6 mph
6 mph
1200
72°F
SW
7 mph
7 mph
