The climate in Bayamon is considered tropical with an average temperature of approximately 80°F. The area is known for its high humidity and frequent rainfall, which is attributed to its location in the foothills of the Luquillo Mountains. The hydrology in Bayamon is dominated by the Bayamon River and its associated tributaries, which flow into the San Juan Bay. Outdoor recreation opportunities in Bayamon include a variety of parks and nature reserves, such as the Julio Enrique Monagas Family Park and the Jardin Botanico y Cultural de Caguas. These areas offer opportunities for hiking, birdwatching, and other outdoor activities.
Bayamon receives approximately mm of rain per year, with humidity levels near 78% and air temperatures averaging around °C. Bayamon has a plant hardyness factor of , meaning plants and agriculture in this region thrive during a short period during spring and early summer. Most plants will die off during the colder winter months.