December weather forecast
Tamarindo, Costa Rica

In December, Tamarindo, Costa Rica finally bids goodbye to the showers with a steep drop in rainfall to 13mm (0.51"). The month's key element showcases a shift away from regular rainfall, allowing ample sunshine to brighten the area. The sea’s temperature transitions slightly towards cooler waters, yet it's very agreeable for water-themed activities. Retaining a comfortable warmth, the weather sets an inviting backdrop for open-air events and gatherings. Thus, December rings in the much-awaited dry period with its remarkably clear skies and pleasurable climate.

Temperature

The arrival of December sees a recorded average high-temperature of a still tropical 31°C (87.8°F), without divergence from the previous month's conditions. In the month of December, Tamarindo records a consistent average low-temperature of 22°C (71.6°F).

Rainfall

In Tamarindo, during December, the rain falls for 10 days and regularly aggregates up to 13mm (0.51") of precipitation. In Tamarindo, during the entire year, the rain falls for 171 days and collects up to 1853mm (72.95") of precipitation.

Sea temperature

The months with the coldest seawater in Tamarindo, Costa Rica, are January through March and December, with an average sea temperature of 27°C (80.6°F).
Note: For activities in the water such as swimming or diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal for prolonged enjoyment without discomfort.

Daylight

The month with the shortest days in Tamarindo is December, with an average of 11h and 30min of daylight.
On the first day of the month, sunrise is at 05:45 and sunset at 17:19. On the last day of December, sunrise is at 06:00 and sunset at 17:32 CST.

Sunshine

The average sunshine in December is 6h.

UV index

With an average maximum UV index of 10, December is the month with the lowest UV index in Tamarindo, Costa Rica. A UV Index estimate of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In December, a regular UV index of 10 translates into these guidelines:
Always be mindful of protection. The risk of damage to skin and eyes is significant if neglected. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Even on overcast days, ensure the application and frequent reapplication of sunscreen with at least an SPF 30, especially post swim or outdoor exercise. Warning! The reflection of sand and water increases the UV dose.