Costa Rica Climate Guide — RE/MAX First Realty

The Two Seasons

Unlike temperate countries, Costa Rica has no spring or fall — just two dramatically different seasons that shape daily life.

☀️ Dry Season — Verano

December → April (5 months)

Sunny skies dominate, especially on the Pacific side
Dusty roads in rural Guanacaste — a stark change from green season
Peak tourism season — book accommodations early
Real estate market most active — ideal for property visits
Rivers can drop significantly; some waterfalls slow
Caribbean coast remains wetter even in "dry" season

🌧️ Rainy Season — Invierno

May → November (7 months)

Afternoon rains typical — mornings often clear and beautiful
Everything turns dramatically green and lush
Significant landscape transformation in just weeks
Unpaved roads in rural areas can become impassable
Landslide risk increases in mountainous zones
Lower prices on rentals; off-peak for most tourism
September–October: peak rainfall months in most regions

Climate Zone Map

Six distinct climate zones mean you can live in dry, tropical, cool-spring, or jungle conditions — all within 4 hours of each other.

Climate by Province

GuanacasteNorth Pacific · dry & sunny

AlajuelaNorthern plains + valley edge

Central ValleyHeredia · San José · Cartago — spring-like

PuntarenasPacific coast — greener toward the south

LimónCaribbean — green all year

Coloured by province for clarity. Within a single province, altitude creates noticeable local variation.

🏠 A helpful tip:
Visit a property in both the dry and green seasons if you can. The landscape — and the access road — can look quite different in February versus October.

Zone-by-Zone Breakdown

Each climate zone has a distinct personality — choose the one that matches your lifestyle and risk tolerance.

🌵 North Pacific — Guanacaste

Guanacaste Province

~28°C avg 1,200 mm/yr Very Dry

The driest province in Costa Rica. Bone-dry from December through April with golden savannahs and bright blue skies. Rainy season (May–Nov) transforms it to bright green. Popular with expats for established infrastructure, Liberia airport, and beach access (Tamarindo, Flamingo, Nosara).

🏠 Buyer NoteWater supply can be inconsistent in dry season. Check well depth and municipal water reliability before purchasing.

🏖️ Central Pacific

Western Puntarenas Province

~27°C avg 2,200 mm/yr Moderate

A balanced zone centered around Jacó, Herradura, and Quepos/Manuel Antonio. Distinct dry season (Dec–Apr) without Guanacaste's extreme heat. Close to San José (1.5 hrs). Marine and fishing culture. Moderate rainfall makes it more lush than Guanacaste without Caribbean humidity.

🏠 Buyer NoteFlood risk in low-lying coastal areas near river mouths. Elevation matters — hillside properties are significantly drier and safer.

🌿 South Pacific — Zona Sur

Southern Puntarenas Province

~26°C avg 4,000–5,000 mm/yr Very Wet

The most biodiverse region in Costa Rica, anchored by Dominical, Uvita, and the Osa Peninsula. Receives up to 5,000mm of rainfall annually — the definition of lush tropical rainforest. Growing expat community, spectacular nature, but remote. Roads can be challenging in rainy season.

🏠 Buyer NoteHumidity is intense — homes need excellent ventilation, mold-resistant materials, and regular maintenance. Property management is essential if you're not full-time.

🌊 Caribbean Coast

Limón Province

~26°C avg 3,500 mm/yr Wet Year-Round

The Caribbean operates on its own rhythm — there is NO true dry season. Lighter periods occur in February–March and September–October, but rain is possible any day. Puerto Viejo and Cahuita are beloved by surfers and nature lovers. Afro-Caribbean culture, unique cuisine, reggae vibes. Less infrastructure than the Pacific.

🏠 Buyer NoteTropical storms and flooding are more frequent here. Property insurance is harder to obtain and more expensive. Investigate flood history of any specific lot.

🌱 Central Valley — Valle Central

San José, Alajuela, Heredia, Cartago

~20–24°C avg ~2,000 mm/yr Spring-Like

Most Costa Ricans live here for a reason. Elevation (1,000–1,500m) creates a perpetual spring-like climate — no air conditioning needed, no extreme heat. San José, Heredia, Alajuela, and Cartago sit in this fertile bowl surrounded by volcanoes. Best infrastructure, hospitals, international schools, and connectivity in the country.

🏠 Buyer NoteNo beach access, but unbeatable quality of life and infrastructure. This is where most long-term expats ultimately settle. Traffic congestion around San José is a real factor.

🌴 Northern Zone — Zona Norte

Northern Alajuela & Heredia

~28°C avg ~3,000 mm/yr Hot & Humid

Flat volcanic lowlands extending toward Nicaragua. Home to Arenal Volcano and La Fortuna — one of the country's top tourist destinations. Hot springs, white-water rafting, hanging bridges. Agricultural heartland. High humidity year-round with significant rainfall. Growing eco-tourism infrastructure but limited urban amenities compared to the Central Valley.

🏠 Buyer NoteArenal area has significant volcanic and seismic activity (though Arenal has been quiet since 2010). Ideal for eco-lodge or vacation rental investments rather than primary residence.

Elevation Changes Everything

In Costa Rica, a 30-minute drive up a mountain can drop temperatures by 10°C. Understanding elevation is as important as understanding region.

Zone	Elevation	Day Temp	Night Temp	Character	Examples
Tierra Caliente Hot Lands	0 – 500m	28–35°C	22–27°C	Hot tropical — most of the coast	Jacó, Limón, Liberia, La Fortuna
Tierra Templada Temperate Lands	500 – 1,500m	22–28°C	16–20°C	Mild spring-like — most comfortable living	San José, Alajuela, Grecia, Atenas
Tierra Fría Cool Lands	1,500 – 2,500m	16–22°C	8–14°C	Cool, misty cloud forest	Monteverde, Cerro de la Muerte
Páramo / Alpine	2,500m+	8–16°C	0–8°C	Cold, remote, near-freezing nights	Chirripó (3,821m), Irazú summit

Monthly Rainfall Calendar

Average monthly rainfall for San José (Central Valley) — the most representative city for long-term residents. Coastal areas receive significantly more.

JAN

15

Dry ☀️

FEB

12

Dry ☀️

MAR

20

Dry ☀️

APR

50

Trans

MAY

220

Wet 🌧️

JUN

240

Wet 🌧️

JUL

195

Wet 🌧️

AUG

200

Wet 🌧️

SEP

305

Peak 🌊

OCT

315

Peak 🌊

NOV

150

Trans

DEC

30

Dry ☀️

Dry Season (Dec–Apr)

Wet Season (May–Nov)

Peak Rainfall (Sep–Oct)

Values in mm · San José Central Valley average · Coastal areas receive 2–3× more

Before You Buy: Climate Due Diligence

Climate affects everything from road access to property maintenance costs. These questions can save you thousands.

🏠 The Smart Buyer's Climate Checklist

🗓️ Visit in Both Seasons A driveway accessible in February may require 4WD in October. Visit or send an agent during peak rainy season (Sep–Oct) before closing.

💧 Check Water Sources In Guanacaste, verify well depth and municipal water schedules. In wet zones, check drainage and flood history. Ask neighbors, not just the seller.

🏗️ Tropical Construction Standards Properties should use galvanized hardware, mold-resistant materials, and excellent ventilation. In humid zones, inspect for signs of rot and mold.

🛣️ Road Access Year-Round Ask specifically: "What does this road look like in September?" Gravel roads in the mountains or South Pacific can become rivers. Factor in road maintenance costs.

⚡ Power & Connectivity Rural zones in the Caribbean and South Pacific experience more frequent outages during storms. Solar backup is worth considering. Check fiber/cable internet availability.

🏡 Maintenance Costs by Zone Wet zones (Caribbean, South Pacific) require ~20–30% more in annual maintenance than the Central Valley. Factor this into your total cost of ownership calculation.