Last updated: August 31, 2025
In Bayamon, Puerto Rico, December brings a delightful tropical climate, with maximum temperatures peaking at 30°C (86°F) and a comfortable average of 25°C (77°F). However, temperatures can drop to a minimum of 21°C (71°F) during the cooler nights. This month is characterized by significant rainfall, accumulating around 66 mm (2.6 in) over approximately 22 days, contributing to a humidity level of 76%. The frequent showers interspersed with warm days create a lush, vibrant atmosphere, making December an intriguing time to experience the natural beauty of Bayamon.
In December, Bayamon, Puerto Rico, welcomes a delightful shift in temperatures as the island bids farewell to the warmer months. The minimum temperature settles around 21°C (71°F), while daytime highs reach a comfortable 30°C (86°F). With an average temperature of 25°C (77°F), this month feels pleasantly mild, making it ideal for outdoor activities and exploring the vibrant local culture. Compared to the preceding months, December's temperatures show a slight dip, transitioning from the higher summer heat, yet still maintain a warm, inviting charm. The overall trend reflects a cozy winter experience, perfect for those looking to escape colder climates.
In December, Bayamon, Puerto Rico, experiences a notable decrease in precipitation compared to the wettest months of the year. With 66 mm (2.6 in) of rainfall spread over 22 days, December marks a transition into the drier winter season. This amount is significantly lower than the staggering 200 mm (7.9 in) recorded in September and 183 mm (7.2 in) in October, illustrating a clear downward trend as the year comes to a close. Despite the reduction in total rainfall, December maintains a steady number of rainy days, indicating that while showers become less intense, they remain a consistent feature of the month's weather. Overall, the shift towards drier conditions in December sets the stage for a more temperate and pleasant climate as the festive season unfolds.
In Bayamón, Puerto Rico, December brings a comfortable humidity level of 76%, maintaining a consistent trend seen throughout the year. The humidity during this month is slightly lower than the more humid summer months of July and August, which peak at 80%. As the year progresses, the humidity gently declines from a high of 80% in these summer months to a more moderate 76% in December, showcasing the island's tropical climate. Additionally, the transition from November's 78% to December's levels indicates a minor but noticeable drop, hinting at the drier months ahead. Overall, while the humidity remains high, the slight variations reflect the natural rhythm of Bayamón's lush environment.
As December rolls into Bayamon, Puerto Rico, residents and visitors can expect a UV Index of 8, which falls within the very high exposure category, with a burn time of just 15 minutes. This marks a slight decrease from the extreme levels observed earlier in the year, where indices peaked at 14 in May. Despite this reduction, caution is still advised as the UV levels remain significant, especially compared to the lower indices seen in the late fall. As you've explored the sun's intensity throughout the year, it’s clear that December continues to demand protective measures against UV exposure. For further details, check out the full report here: Bayamon UV Index.
UV Risk Categories
December in Bayamón, Puerto Rico, embraces a delightful blend of warmth and light, boasting 319 hours of sunshine. This marks a pleasant consistency as the sun begins its gentle descent towards the year's end, slightly recovering from a dip seen in November with 299 hours. Interestingly, while December’s sunlight is not as abundant as the peak months of May and June—both exceeding 350 hours—it still provides a significant glow that invites residents and visitors alike to revel in the region's tropical charm. As the sun graces Bayamón with its warm embrace, the month stands as a reminder of the vibrant energy that characterizes Puerto Rican winters.
In December, Bayamón, Puerto Rico enjoys a decent chance of sunny weather, with 58% likelihood of sunshine. This marks a slight increase from November's 55%, suggesting a promising shift as the year draws to a close. Interestingly, while January and February show higher chances of sunshine at 48% and 65% respectively, December stands out as a relatively bright spot among the late-year months. The trend indicates that as we transition from the rainy season, residents and visitors alike can expect a notable uptick in sunny days, making December a delightful time to enjoy Bayamón’s vibrant outdoor life.
In Bayamón, Puerto Rico, December ushers in consistent daylight, mirroring the 11 hours seen in January and February. As the year progresses from spring to summer, daylight duration peaks at 13 hours in June and July, inviting longer evenings filled with exploration and relaxation. The transition into autumn sees a gentle decline, with daylight once again settling at 12 hours in August and September. By the time December arrives, the captivating rhythm of daylight hours reflects a cyclical return to shorter days, reminding us of the island's unique climate and the subtle shifts in nature throughout the year.
As December arrives in Bayamón, Puerto Rico, the average wind speed settles at 3.3 m/s (7 mph), creating a refreshing ambiance to close out the year. Notably, this month experiences a gentle increase compared to the calmer breezes of the previous months, which saw averages dipping below 3.0 m/s. The wind patterns throughout the year reveal a tendential rise during the warmer months, peaking in July at 4.0 m/s (9 mph), before transitioning into the more tranquil conditions of late fall. December’s breezy charm serves as a reminder of the seasonal shifts, blending mild winds with the island's vibrant atmosphere—perfect for enjoying the festive spirit while soaking in the tropical surroundings.
Weather in Bayamon varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bayamon, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, temperatures in the region typically range from a minimum of 21°C (71°F) to a maximum of 30°C (86°F), with an average temperature of 25°C (77°F). This month experiences 66 mm (2.6 in) of precipitation over approximately 22 days, contributing to a humidity level of 76%. In contrast, January sees slightly cooler temperatures, with minimums of 19°C (66°F) and maximums reaching 29°C (84°F), averaging 24°C (76°F). The rainfall decreases to 48 mm (1.9 in) over about 16 days, while humidity remains steady at 76%. For more detailed insights into the weather during this month, you can check Bayamon weather in January.
In December, the weather tends to be slightly warmer compared to February, with minimum temperatures around 21°C (71°F) and an average of 25°C (77°F), reaching a maximum of 30°C (86°F). This month also experiences higher precipitation levels, totaling 66 mm (2.6 in) spread across 22 days and accompanied by a humidity of 76%. By contrast, February sees a slight drop in temperatures, with a minimum of 20°C (69°F), an average of 24°C (75°F), and a maximum of 28°C (83°F). Precipitation decreases to 53 mm (2.1 in) over 18 days, while humidity remains relatively stable at 75%. For a more detailed look at the weather patterns, visit Bayamon weather in February.
In December, the weather tends to be warm, with temperatures ranging from a minimum of 21°C (71°F) to a maximum of 30°C (86°F) and an average of 25°C (77°F). The month experiences substantial rainfall, with around 66 mm (2.6 in) of precipitation over 22 days, leading to a relatively high humidity of 76%. In comparison, March offers slightly cooler conditions, with a minimum of 20°C (69°F) and a maximum of 29°C (85°F), averaging 24°C (76°F). This month sees increased precipitation at 80 mm (3.2 in) over 21 days but maintains a similar humidity level of 74%. For a more detailed look at March weather, you can visit Bayamon weather in March.
In comparing the weather between December and April, both months experience similar temperature ranges, with minimums around 21°C (71°F), average temperatures at 25°C (77°F), and maximums hitting 30°C (86°F). However, April sees a slight increase in precipitation, totaling 77 mm (3.0 in) across 20 days, compared to December's 66 mm (2.6 in) over 22 days. Humidity levels remain comparable, with December at 76% and April slightly lower at 75%. For more specific details on Bayamon weather in April, you can check this link: Bayamon weather in April.
When comparing the weather in December and May, we can see some notable differences. December features a temperature range with a minimum of 21°C (71°F) and an average high of 30°C (86°F), while May is slightly warmer, with a minimum of 22°C (72°F) and a maximum of 31°C (87°F). Precipitation in December averages 66 mm (2.6 in) over 22 days, whereas May sees increased rainfall, totaling 98 mm (3.9 in) across 24 days. Humidity levels remain relatively similar, with December at 76% and May at 75%. For a more detailed look at the weather conditions in May, you can check out Bayamon weather in May.
In comparing the weather between December and June, we notice a slight increase in temperature and humidity during June. December features a minimum temperature of 21°C (71°F) and an average of 25°C (77°F), while June's temperatures range from a minimum of 23°C (74°F) to an average of 27°C (80°F). Additionally, June tends to be wetter, receiving 99 mm (3.9 in) of precipitation over 23 days compared to December's 66 mm (2.6 in) across 22 days. Humidity levels remain fairly consistent, with December at 76% and June slightly higher at 77%. For a more detailed look at June weather, visit Bayamon weather in June.
In December, the weather is generally warm with temperatures ranging from a minimum of 21°C (71°F) to a maximum of 30°C (86°F), averaging around 25°C (77°F). The month experiences 66 mm (2.6 in) of precipitation over 22 days and has a humidity level of 76%. In contrast, July tends to be slightly warmer, with temperatures ranging from a minimum of 23°C (74°F) to a maximum of 31°C (88°F), resulting in an average of 27°C (81°F). It is also wetter, with 124 mm (4.9 in) of precipitation across 24 days and a higher humidity level of 80%. For a closer look at July weather specifics, visit Bayamon weather in July.
In December, Bayamon experiences a warm climate with temperatures ranging from a minimum of 21°C (71°F) to a maximum of 30°C (86°F), averaging 25°C (77°F). The month sees a moderate amount of rainfall, totaling 66 mm (2.6 in) over 22 days, and humidity levels averaging around 76%. In contrast, August is slightly warmer, with temperatures starting at a minimum of 23°C (74°F) and reaching up to 31°C (89°F), averaging 27°C (81°F). August also brings a higher precipitation level of 130 mm (5.1 in) across 25 days, and humidity levels are a bit more elevated at 80%. For a detailed overview of the weather in August, you can check this link: Bayamon weather in August.
In comparing the weather between December and September, we see some notable differences. December experiences slightly cooler temperatures, with average highs around 25°C (77°F) compared to September's 27°C (81°F). While both months are relatively humid, December's humidity stands at 76%, slightly lower than September's 79%. Precipitation, however, is considerably higher in September, with 200 mm (7.9 in) falling over 27 days, compared to December's 66 mm (2.6 in) spread over 22 days. For a closer look at weather specifics, you can check this link: Bayamon weather in September.
In comparing the weather between December and October, we see some notable differences. December features slightly lower temperatures, with a minimum of 21°C (71°F) and an average of 25°C (77°F), while October has a minimum of 23°C (74°F) and an average of 27°C (80°F). Additionally, October experiences significantly higher precipitation, totaling 183 mm (7.2 in) over 27 days compared to December’s 66 mm (2.6 in) over 22 days. Both months have high humidity levels, with December at 76% and October slightly higher at 78%. For a more detailed analysis of October's climate, you can check out Bayamon weather in October.
In comparing the weather between November and December, we find that December experiences slightly warmer temperatures, with average highs of 30°C (86°F) and lows of 21°C (71°F), compared to November's temperatures, which range from a minimum of 22°C (72°F) to an average of 26°C (79°F). Precipitation levels decrease in December, with 66 mm (2.6 in) over 22 days, while November sees significantly more rain at 120 mm (4.7 in) across 23 days. Additionally, humidity remains fairly stable, with December averaging 76% compared to November's 78%. For more detailed insights, you can check Bayamon weather in November.
As December rolls in, Bayamon experiences a delightful shift in weather that sets it apart from the preceding months. With average temperatures hovering around a comfortable 25°C, outdoor enthusiasts can enjoy milder conditions perfect for exploring the area's rich culture and stunning landscapes. However, be prepared for some rainfall, as the month sees increased precipitation compared to previous ones, with about 22 days of showers contributing to a lush environment. The humidity remains fairly high at 76%, adding to the tropical charm of the season. For those looking to plan their travels, understanding these unique December weather features can enhance your experience in this vibrant region. For more detailed insights, check out Bayamon Climate.