- Dry season
- Dec–Apr
- Green season
- May–Nov
- Caribbean often driest
- Sep–Oct
- San José average
- ~22 °C
Dry season and green season
Costa Rica is close to the equator, so temperatures change more with altitude than with the season. On the coasts, days are hot (around 27–33 °C); in the Central Valley they are mild; in Monteverde and on the volcanoes they are cool. The dry season runs from about December to April on the Pacific side and in the Central Valley. The green season, from May to November, usually brings sunny mornings and afternoon showers, with the heaviest rain in September and October.
Weather by region
| Region | Climate | Best time |
|---|---|---|
| Guanacaste | Hot, driest region | December–April; green and quieter May–November |
| Central Valley | Mild, spring-like | December–April |
| Arenal | Warm, humid, showers year-round | February–April for clear volcano views |
| Monteverde | Cool, misty, windy in dry season | All year; bring layers |
| Central Pacific | Hot, humid | December–April |
| South Pacific & Osa | Wettest, very green | December–April; some lodges close in October |
| Caribbean | Humid, rain spread through the year | September–October and February–March |
For live conditions, check a weather radar before driving mountain roads in the green season, when landslides can close routes. See the driving guide.
Plan your trip to Costa Rica
Tours & tickets
Guided tours, day trips and activities with free cancellation on most bookings.
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Frequently asked questions
What is the rainy season in Costa Rica?
Roughly May to November on the Pacific side and in the Central Valley, with the most rain in September and October. The Caribbean coast is wetter overall but often driest in September and October.
Which part of Costa Rica has the best weather?
Guanacaste is the driest and sunniest region, especially from December to April.
Last reviewed October 2026. Opening hours, prices and road conditions change: check official sources before you travel.