Seasonal ranking
Warmest sea temperature in Costa Rica in September
Where the sea is warmest across Costa Rica during September, ranked by long-term monthly average water temperature. Puerto Viejo Beach (Limon, Costa Rica) tops the list at around 29°C. Open any spot for today's live water temperature and a 7-day swim forecast.
- 1Puerto Viejo BeachLimon · Costa Rica · Caribbean SeaWarm — comfortable swimming29°CSeptember average
- 2Playa ManzanilloLimon · Costa Rica · Caribbean SeaWarm — comfortable swimming29°CSeptember average
- 3Cahuita BeachLimon · Costa Rica · Caribbean SeaWarm — comfortable swimming29°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
- 8Playa AvellanasGuanacaste · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 9Santa Teresa BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 10Mal Pais BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 11Montezuma BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 12Manuel Antonio BeachPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 13Playa DominicalPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 14Playa UvitaPuntarenas · Costa Rica · Pacific OceanWarm — comfortable swimming28°CSeptember average
- 15Playa Hermosa GuanacasteGuanacaste · Costa Rica · Pacific OceanPleasant — swimmable without a wetsuit23°CSeptember average
- 16Playa ConchalGuanacaste · Costa Rica · Pacific OceanPleasant — swimmable without a wetsuit23°CSeptember average
Warmest sea in September elsewhere
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Costa Rica in September — frequently asked questions
- Where is the sea warmest in Costa Rica in September?
- Puerto Viejo Beach in Costa Rica has the warmest sea in Costa Rica in September, averaging about 29.0 °C. Playa Manzanillo (29.0 °C) and Cahuita Beach follow close behind.
- 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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