October is the green season's peak expression on the Pacific. Rainfall is at its most intense, rivers are full, and the wildlife that thrives in wet conditions — from poison dart frogs to humpback whales — is most visible. The Caribbean coast, by contrast, enters one of its best periods. Días de las Culturas on October 12 marks one of Costa Rica's most thoughtful public holidays.
Highlights this month
- ✓Humpback whale season at absolute peak — both Northern and Southern Hemisphere populations present simultaneously
- ✓Día de las Culturas on October 12 — recognising indigenous heritage and multicultural roots
- ✓Caribbean coast in excellent condition — one of the drier months on the Atlantic side
- ✓Wildlife activity and sightings at seasonal peak throughout the country
Best for
Photography
October on the Pacific is dramatic. Whale breaches, storm skies over volcanic peaks, and rivers at full volume. The Caribbean coast offers a complete contrast — calm, clear, warm — for underwater photography.
Worth knowing
The Pacific coast and Central Valley experience their heaviest rainfall in October. Flash flooding is a real risk in low-lying areas and near rivers. Don't drive arroyos or fords after heavy rain.
Event note — Día de las Culturas on October 12 is a day of genuine cultural reflection — acknowledging indigenous heritage and the complexity of Costa Rican identity. Worth engaging with beyond the public holiday.