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 advent of December brings an average high-temperature of a still tropical 31°C (87.8°F), exhibiting minor difference from the previous month. Throughout December, Tamarindo witnesses a nighttime temperature average of 22°C (71.6°F).

Rainfall

In December, the rain falls for 10 days. Throughout December, 13mm (0.51") of precipitation is accumulated. Throughout the year, there are 171 rainfall days, and 1853mm (72.95") of precipitation is accumulated.

Sea temperature

January through March and December, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater in Tamarindo.
Note: Ideal surface water temperatures for any water activity fall between 25°C (77°F) and 29°C (84.2°F), offering maximum enjoyment for lengthened periods.

Daylight

The month with the shortest days 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

The month with the lowest UV index in Tamarindo, Costa Rica, is December, with an average maximum UV index of 10. A UV Index reading of 8 to 10 represents a very high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 10 during December translates into the following directions:
Swift harm can befall unprotected skin and eyes. Prioritize safety. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Broad-spectrum SPF 30+ sunscreen must be generously applied and reapplied every two hours or post any outdoor activity or swim. Be alert! The reflection of water and sand augments UV radiation intensity.