Seasonal ranking
Coldest sea temperature in Costa Rica in September
Where the sea is coolest across Costa Rica during September, ranked by long-term monthly average water temperature. Playa Hermosa Guanacaste (Guanacaste, Costa Rica) is the coolest at around 23°C. Open any spot for today's live water temperature and a 7-day swim forecast.
- 1Playa Hermosa GuanacasteGuanacaste · Costa Rica · Pacific OceanPleasant — swimmable without a wetsuit23°CSeptember average
- 2Playa TamarindoGuanacaste · Costa Rica · Pacific OceanPleasant — swimmable without a wetsuit23°CSeptember average
- 3Playa ConchalGuanacaste · Costa Rica · Pacific OceanPleasant — swimmable without a wetsuit23°CSeptember average
- 4Playa FlamingoGuanacaste · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 5Playa Hermosa CRGuanacaste · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 6Playa SamaraGuanacaste · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 7Playa NosaraGuanacaste · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 8Santa Teresa BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 9Mal Pais BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 10Montezuma BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 11Manuel Antonio BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 12Playa DominicalPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 13Playa UvitaPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 14Puerto Viejo BeachLimon · Costa Rica · Caribbean SeaWarm — comfortable swimming29°CSeptember average
- 15Playa ManzanilloLimon · Costa Rica · Caribbean SeaWarm — comfortable swimming29°CSeptember average
- 16Cahuita BeachLimon · Costa Rica · Caribbean SeaWarm — comfortable swimming29°CSeptember average
Coldest sea in September elsewhere
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Costa Rica in September — frequently asked questions
- Where is the sea coldest in Costa Rica in September?
- Playa Hermosa Guanacaste in Costa Rica has the coldest sea in Costa Rica in September, averaging about 23.0 °C. Playa Tamarindo (23.0 °C) and Playa Conchal are the next coolest.
- How many beaches in Costa Rica are warm enough to swim in September?
- 16 of the top 16 ranked beaches in Costa Rica average 22 °C or more in September, which most swimmers find comfortable without a wetsuit.
- How are these September sea temperatures calculated?
- Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.
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