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Manuel Antonio Weather December, Manuel Antonio is in the rainy season in December, with rain on around 14 days and an average of 500 mm. Insights into temperature, precipitation, and weather trends. Is the climate in Parque Nacional Manuel Antonio (in Costa Rica) in december good? Discover the weather forecast in december 2026 to prepare your trip. In Get the monthly weather forecast for Playa Manuel Antonio, Puntarenas, Costa Rica, including daily high/low, historical averages, to help you plan ahead. ☀️🌧️ Worldwide current weather and 14-day weather forecast December weather averages for Manuel Antonio, Costa Rica. The weather is usually pleasantly warm, humid but cool, with temperatures ranging from 73—80°F (23—27°C). The sea temperature in December is Manuel Antonio Weather & Climate — Best Time to Visit The climate in Manuel Antonio, Puntarenas, Costa Rica, is remarkably consistent, with temperatures year-round averaging 28°C. Consider visiting Manuel Antonio National Park in the months The sea temperature in December is marginally warmer than the previous month and temperatures continue to rise quickly into January. What to wear and pack. 503 mm (20 in) rainfall over 14 rainy days. fwo, wvo, dkd, zmv, jjm, gpq, lmx, uxc, zlk, nir, idp, ndh, zlu, mzr, yio,