The Two Main Seasons
Costa Rica’s climate splits cleanly into dry and rainy periods. Knowing which dominates during your travel window helps you balance weather reliability, crowd levels, and cost.
High Season
December – April
Sunny mornings, low humidity, 70–95 °F (21–35 °C). Perfect beach days, clear volcano views, and easy driving conditions.
Rainy Season
May – November
Afternoon showers, lush scenery, 70–90 °F (21–32 °C). Fewer tourists, incredible surfing swells, and waterfalls at full power.
Transitional weeks — late April and late November — tend to blend traits of both seasons, offering sunny mornings and only brief rain in the late afternoon. These can be sweet-spot weeks for deals and weather.
Regional Climate Cheat-Sheet
Costa Rica’s mountains, coasts, and valleys create distinct micro-climates that can make one province bone-dry while another soaks in rain.
Pacific Coast
Guanacaste, Nicoya, Manuel Antonio. Pronounced dry season — dusty by March, rainy by June. The classic sunscreen zone.
Central Valley & Highlands
San José, Monteverde, Arenal. Pleasant 68–78 °F year-round; cool evenings as low as 55 °F. Rain is common but usually short-lived.
Caribbean Coast
Puerto Viejo, Tortuguero. No true “dry” spell — showers can pop up any month — yet September–October are surprisingly sunny.
Southern Pacific & Osa
The country’s rain magnet. Towering cloudbursts feed famed biodiversity. Roads can wash out Sept–Oct; plan buffer days.
Month-by-Month Breakdown
Pick the sweet-spot weeks for your goals with this at-a-glance calendar of temperatures and rainfall across both coasts.
| Month | Pacific Temp | Pacific Rain | Caribbean Rain | Highlights | Watch Out |
|---|---|---|---|---|---|
| January | 80–90 °F | 1.2″ | 5.9″ | Peak beach weather; festivals | High rates, early sell-out |
| February | 80–90 °F | 0.8″ | 5.1″ | Ideal for hiking, diving | Similar crowds as Jan |
| March | 85–95 °F | 0.8″ | 4.7″ | Sea calm, vivid sunsets | Hottest month; hydrate |
| April | 85–95 °F | 1.0″ | 5.5″ | Easter events; wildlife viewing | Rising humidity |
| May | 80–90 °F | 3.2″ | 6.3″ | Lower prices; green hillsides | Afternoon storms begin |
| June | 80–90 °F | 3.9″ | 7.1″ | Surf peaks; turtle season starts | Humid; trails slick |
| July | 80–90 °F | 4.3″ | 7.9″ | Veranillo “mini-summer” dry window | Rain can still surprise |
| August | 80–90 °F | 4.7″ | 8.3″ | Fewer visitors; whale season | Persistent drizzle, mud |
| September | 75–85 °F | 5.9″ | 8.7″ | Caribbean sunniest; rainforest photography | Pacific deluges; some lodges close |
| October | 75–85 °F | 5.1″ | 7.9″ | Cheapest flights; dramatic waterfalls | Wettest month countrywide |
| November | 80–90 °F | 2.8″ | 6.7″ | Rains taper; shoulder bargains | Weather flips day-to-day |
| December | 80–90 °F | 1.6″ | 5.5″ | Dry season returns; holiday buzz | Book early or pay premium |
Best Time by Interest
Match your passion to the window when conditions peak and crowds thin.
Surfing
Experienced: May–Nov Pacific swells.
Beginners: Dec–Apr gentler breaks in Tamarindo & Samara.
Wildlife
General (monkeys, sloths): Jan–Apr
Sea turtles: Jul–Oct
Humpback whales: Aug–Nov
Beaches & Sun
Late Dec–early Apr on the Pacific.
Caribbean shines in Sept–Oct.
Rainforest Photography
May–Aug for misty mornings; September for the fullest waterfalls and lushest scenery.
Budget Travel
Mid-May to mid-Nov, excluding school vacations. Flights and hotels drop significantly.
Hiking & Volcanoes
Jan–Apr for clearest views. Arenal and Poás are best in dry-season mornings.
Daily Rhythm: Sun, Showers & Stars
Understanding the typical daily pattern is just as important as knowing the season. Most of Costa Rica follows a reliable cycle:
- 🌅 6 – 11 a.m. Clear, warm, light breeze. This is prime time — schedule hikes, canopy tours, and driving transfers in the morning hours.
- ⛅ Noon – 4 p.m. Heat builds clouds and brief showers. Especially in wet season, this is perfect for a siesta, café break, or indoor activity.
- 🌇 5 – 9 p.m. Skies often clear again, revealing fiery Pacific sunsets or the humid hush of the Caribbean night. Ideal for dinner or a sunset cocktail.
If the forecast reads “70% chance of rain” — don’t panic. It usually means one intense 30-minute storm, not a wash-out day. Plan your adventures in the morning and you’re golden.
Packing Checklist
Versatility and quick-dry fabrics are your best friends. Here’s what to bring depending on your travel window:
| Item | Dry Season | Rainy Season | Highlands Year-Round |
|---|---|---|---|
| Quick-dry tees & shorts | ✔ | ✔ | – |
| Light waterproof jacket | – | ✔ | ✔ |
| Sturdy hiking shoes | ✔ | ✔ | ✔ |
| Flip-flops / sandals | ✔ | ✔ | – |
| Wide-brim hat & SPF 30+ | ✔ | ✔ | ✔ |
| Thin fleece or sweater | – | – | ✔ |
| Compact travel umbrella | – | ✔ | Optional |
| Insect repellent | Evening coastal areas year-round | ||
Frequently Asked Weather Questions
¡Pura Vida! Costa Rica rewards visitors who match their interests to its climate rhythm. Whether you crave cloud-forest mist, Pacific swells, or Caribbean sunshine — the choice shifts month to month and coast to coast. A little meteorological savvy turns a good trip into an unforgettable one.