Storage Tips · Costa Rica Living
Someone who moved to the Costa Ballena from Canada told us once that they thought they understood humidity. They had survived Toronto summers, spent time in Florida, weathered a rainy season in Central America before. They were not prepared for what they found in their rental house after six weeks away. The leather sofa had turned green. The guitar neck had warped past playability. Three boxes of books had fused into a single mass.
Costa Rica's Pacific south coast is one of the most humid environments on Earth. The Osa Peninsula and Costa Ballena receive some of the highest rainfall in the Western Hemisphere. Humidity levels regularly exceed 85% and during rainy season can approach 100% for weeks at a time. This is not just uncomfortable. It is actively destructive to almost everything people own.
Absorbs moisture, swells, warps, and cracks. Joints loosen. Drawers jam. Finishes bubble and peel. Solid wood pieces can be damaged beyond repair within a single rainy season.
Internal corrosion on circuit boards, oxidized connectors, condensation inside screens. A laptop left in a humid space for months may power on but fail unpredictably. Hard drives are particularly vulnerable.
Mold colonizes fabric within days at high humidity. Leather grows a white bloom of mold that penetrates the material. Clothing stored in cardboard boxes comes out with a smell that never fully washes out.
Surface rust appears on unprotected steel within weeks. Tool edges dull from oxidation. Bicycle chains, drill bits, hand tools, and kitchen knives all suffer without protection.
Paper absorbs moisture and warps. Ink runs. Mold grows on organic material. Passports, property documents, and sentimental books can be permanently damaged in a single wet season.
Saturate with moisture, weaken structurally, and collapse. Mold grows on the cardboard itself and spreads to contents. Cardboard is essentially a wick that pulls moisture toward whatever is stored inside it.
A lot of expats in the Uvita and Dominical area try to solve the storage problem with whatever is available locally: a covered terrace, a space under a friend's house, a rented garage with a corrugated metal roof. These solutions fail because they do not address the fundamental issue.
Humidity is not just about rain getting in directly. It is about moisture in the air itself. A covered terrace still has open sides through which saturated air circulates freely. A corrugated metal roof creates condensation on its underside when temperatures drop at night. A garage with a concrete floor will wick ground moisture upward unless it is sealed. Even in a dry space, opening a door during the rainy season fills the interior with humid air that then has nowhere to go.
The standard customers mention most often: "Our things stayed clean and dry." This sounds like a low bar. In Costa Rica's climate, it is not. It requires the right construction, the right materials, and consistent maintenance.
Concrete does not absorb moisture the way wood does. Enclosed concrete units with sealed doors create a barrier between your belongings and the saturated outside air. At Uvita Storages, every unit is fully enclosed concrete with tiled floors and painted walls, meaning there is no organic material in the structure itself for mold to colonize.
The door is the most critical junction. A door that seals properly against its frame prevents the continuous exchange of interior and exterior air that slowly saturates an otherwise dry space. This is why the quality of the door and its maintenance matters enormously in tropical storage.
A facility where someone lives and works on the property notices problems early. A door seal that starts to fail. A drainage issue that could affect a unit. Erick and Carmen Barrantes live above the units at Uvita Storages. Issues get caught before they become damage.
Secure, enclosed, concrete units in the heart of Uvita. Starting at $85 per month.
Ask about availabilityHumidity levels above 80% cause wood to warp and crack, metal to rust, fabric and leather to grow mold, electronics to corrode internally, and cardboard to collapse. The Pacific south coast is one of the most humid environments in the Western Hemisphere.
Enclosed concrete units with sealed roller doors are the most effective protection. Uvita Storages uses fully enclosed concrete construction with tiled floors and painted walls, which significantly reduces moisture exposure compared to open shelters or corrugated containers.
Always use sealed plastic bins in Costa Rica, especially for long-term storage or rainy season. Cardboard absorbs moisture rapidly, weakens structurally, and allows mold to reach contents. Hard plastic bins with locking lids provide a strong barrier against humidity.
Store electronics in sealed plastic bins with silica gel desiccant packets. Clean and dry all items before storing. Use a proper enclosed concrete storage unit rather than an open or semi-open space. Check and replace silica gel packets every few months.