Last updated: August 31, 2025
Experience the December weather in Bayamón, Puerto Rico, where the climate is characterized by warm temperatures and moderate humidity. With maximum highs reaching 31°C (87°F) and average daily temperatures around 26°C (78°F), the weather remains pleasant for both locals and visitors. The month sees a minimum temperature of 22°C (73°F), perfect for evening strolls. However, be prepared for occasional rain, as December averages 50 mm (2.0 in) of precipitation over 16 days. The 76% humidity adds to the tropical feel, making December a unique blend of warmth and refreshing showers in this vibrant city.
In December, Bayamon, Puerto Rico, offers pleasantly warm temperatures that mark the transition into the winter months. With a minimum of 22°C (73°F) and an average of 26°C (78°F), the weather is generally comfortable, inviting locals and visitors alike to enjoy outdoor activities. The maximum temperature can reach up to 31°C (87°F), providing ample opportunities for sun-soaked days while still feeling a touch of the holiday spirit. As December approaches, you'll notice a slight dip in the minimum temperatures compared to the preceding months, reflecting the gradual cooling trend of the season. Overall, this month sets a delightful stage for exploring the vibrant culture and beautiful surroundings of Bayamon.
In December, Bayamon, Puerto Rico experiences a moderate precipitation level of 50 mm (2.0 in), significantly lower than the torrential rains of September, which sees an average of 172 mm (6.8 in). The month features around 16 rainy days, contributing to an overall trend of diminishing rainfall as the year closes, especially when compared to the earlier, wetter months of July and August that boast 76 mm (3.0 in) and 86 mm (3.4 in) respectively. As the tropics transition towards drier conditions, December serves as a gentle reminder of the region's dynamic climate, blending periods of rainfall with the soothing warmth characteristic of Puerto Rico's winter months.
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.
In December, Bayamon, Puerto Rico, continues to experience a very high UV Index of 8, with a burn time of approximately 15 minutes for unprotected skin. This marks a slight decline from the extreme values seen in the peak months of February through May, where the UV Index soared to 11 and even 14. As the year winds down, residents and visitors alike can benefit from the slightly reduced UV exposure, though caution is still warranted. Overall, the UV levels in Bayamon showcase a consistent trend of high intensity throughout the year, reminding us that sun safety remains a priority. For a comprehensive look at the UV Index trends in Bayamon, visit Bayamon UV Index.
UV Risk Categories
In Bayamon, Puerto Rico, December greets residents and visitors with a delightful 319 hours of sunshine, marking a significant brightness as it closes out the year. This month showcases a steady luminosity, holding its own beautifully against the variations seen throughout the year. As we observe the trends, December follows the summertime highs of May and July, where sunshine peaks at 356 and 354 hours respectively, while also demonstrating resilience compared to the cooler months. The steady decline from the summer's zenith through the fall reveals a balanced seasonal transition that still rewards locals with ample daylight. With each passing month, sunshine hours gracefully ebb and flow, but December's embrace of warmth serves as a cheerful reminder of the island's vibrant climate even in the heart of winter.
In Bayamon, Puerto Rico, December brings a notable 64% chance of sunny weather, making it one of the brighter months as the year draws to a close. This percentage reflects a delightful trend from November's 61%, creating a seamless transition into winter. The sunny potential in December is slightly above the seasonal average, hinting at a festive and enjoyable atmosphere for outdoor activities. Moreover, compared to the upcoming months, December stands out as a more favorable time for sun-seekers, overshadowing the typically cloudier periods of June and July. Overall, if you're planning a visit during this month, the odds are definitely in favor of enjoying that cherished Caribbean sunshine.
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 settles in Bayamon, Puerto Rico, the average wind speed picks up slightly to 4.4 m/s (10 mph), reflecting a seasonal trend of moderate breeziness. This uptick follows a month of diminishing winds, where November saw a gentle 3.7 m/s (8 mph). It's intriguing to note that as the year wraps up, wind speeds generally show a tendency to rise from the lull of the summer months, peaking at 5.3 m/s in both February and July. December's breezes create a refreshing ambiance, providing a lovely contrast to the humid heat of earlier months while hinting at the inviting climate that draws visitors to this vibrant coastal town year-round.
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.
December and January weather presents a transition that reflects slight variations in temperature and precipitation. In December, temperatures range from a minimum of 22°C (73°F) to a maximum of 31°C (87°F), with an average of 26°C (78°F) and a total precipitation of 50 mm (2.0 in) over 16 days. In comparison, January features slightly cooler temperatures, with a minimum of 20°C (69°F), an average of 25°C (77°F), and a maximum of 30°C (86°F). Additionally, January experiences less rainfall, with 39 mm (1.5 in) falling over just 12 days. Both months maintain a consistent humidity level of 76%. For a closer look at January conditions, you can visit Bayamon weather in January.
December and February exhibit similar warm climates, with December slightly warmer overall. In December, temperatures range from a minimum of 22°C (73°F) to a maximum of 31°C (87°F), with an average of 26°C (78°F). The month sees higher precipitation, averaging 50 mm (2.0 in) over 16 days, and humidity levels at 76%. Conversely, February experiences slightly cooler temperatures, with a minimum of 21°C (70°F) and a maximum of 30°C (85°F), averaging 25°C (77°F). February's precipitation is lower, totaling 43 mm (1.7 in) spread across 13 days, accompanied by a humidity level of 75%. For a detailed look at February weather specifics, check out Bayamon weather in February.
In December, Bayamon experiences warm temperatures, with a minimum of 22°C (73°F) and an average of 26°C (78°F), peaking at 31°C (87°F). The month sees about 50 mm (2.0 in) of precipitation over 16 days, accompanied by a humidity level of 76%. In contrast, March's weather is slightly cooler, featuring a minimum temperature of 21°C (70°F) and an average of 25°C (77°F), while still reaching a maximum of 31°C (87°F). Precipitation increases to 72 mm (2.8 in) but occurs over just 14 days, with humidity remaining relatively low at 74%. For more details, visit Bayamon weather in March.
In December, temperatures range from a minimum of 22°C (73°F) to a maximum of 31°C (87°F), with an average temperature of 26°C (78°F). The month experiences about 50 mm (2.0 in) of precipitation over 16 days, contributing to a humidity level of 76%. In contrast, April has similar temperature characteristics, maintaining a minimum of 22°C (71°F), an average of 26°C (78°F), and a slightly higher maximum of 31°C (88°F). However, April sees a bit more precipitation at 55 mm (2.2 in), but fewer rainy days at just 10, resulting in a humidity level of 75%. For more detailed insights, you can check Bayamon weather in April.
December and May showcase relatively mild weather, but with slight variations. In December, temperatures range from a minimum of 22°C (73°F) to a maximum of 31°C (87°F), while May sees a slightly warmer range with minimums at 23°C (73°F) and maximums reaching 32°C (90°F). Precipitation in December totals 50 mm (2.0 in) over 16 days, whereas May experiences a bit more rain at 58 mm (2.3 in) spread across 14 days. Humidity levels remain comparable, with December at 76% and May slightly lower at 75%. For more details on May weather, you can check Bayamon weather in May.
In December, the weather features a minimum temperature of 22°C (73°F) and an average of 26°C (78°F), while the maximum temperature reaches 31°C (87°F). The month experiences approximately 50 mm (2.0 in) of precipitation over 16 days, with humidity levels around 76%. In contrast, June presents slightly warmer conditions, with a minimum temperature of 24°C (75°F) and an average of 27°C (81°F), peaking at 32°C (90°F). Rainfall increases to about 62 mm (2.4 in) over 15 days, with humidity hovering at 77%. For more detailed information about the weather in June, you can check Bayamon weather in June.
December and July present distinctly different weather patterns. In December, temperatures range from a minimum of 22°C (73°F) to a maximum of 31°C (87°F), with an average of 26°C (78°F). This month sees around 50 mm (2.0 in) of rainfall over 16 days, accompanied by a humidity level of 76%. In contrast, July is slightly warmer, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (90°F) and an average of 28°C (82°F). The precipitation in July is higher at 76 mm (3.0 in) spread over 17 days, along with a humidity increase to 80%. For more details, check out Bayamon weather in July.
In comparing the weather of December and August, December tends to be slightly cooler with average temperatures ranging from a minimum of 22°C (73°F) to a maximum of 31°C (87°F), while August features warmer averages that range from a minimum of 25°C (77°F) to a maximum of 32°C (90°F). Precipitation is more frequent in August, with a total of 86 mm (3.4 in) over 18 days, compared to December's 50 mm (2.0 in) spread over 16 days. Humidity levels are also marginally higher in August at 80%, compared to December's 76%. For more detailed information, check out Bayamon weather in August.
In comparing the weather of December and September, December tends to be slightly cooler with average temperatures ranging from a minimum of 22°C (73°F) to a maximum of 31°C (87°F), while September sees warmer averages with minimums of 25°C (77°F) and maximums of 32°C (90°F). Additionally, December experiences less precipitation, with 50 mm (2.0 in) over 16 days, compared to September's significantly higher precipitation levels of 172 mm (6.8 in) over 23 days. Humidity is relatively high in both months, with December at 76% and September at 79%. Overall, December offers a milder climate, making it potentially more comfortable for outdoor activities. For more details on September weather, visit Bayamon weather in September.
In comparing the weather of December and October, it is evident that both months feature warm temperatures, though October tends to be slightly warmer on average. The minimum temperature in December is 22°C (73°F) compared to October's 24°C (75°F), while the average temperature is 26°C (78°F) in December and 27°C (81°F) in October. Additionally, October experiences significantly more rainfall, with 136 mm (5.3 in) over 22 days, whereas December sees only 50 mm (2.0 in) over 16 days. Humidity levels are relatively similar, with December at 76% and October at 78%. For more detailed insights, you can refer to Bayamon weather in October.
In comparing the weather of December and November, both months maintain similar average temperatures, with December experiencing a slightly lower minimum temperature of 22°C (73°F) compared to November's 23°C (74°F). The maximum temperatures remain consistent, with December reaching up to 31°C (87°F) and November peaking at 30°C (87°F). However, December sees a significant decrease in precipitation, with only 50 mm (2.0 in) over 16 days, while November has more rainfall at 93 mm (3.7 in) across 17 days. Humidity levels are slightly lower in December at 76%, compared to November’s 78%. For a detailed look at November's conditions, you can refer to Bayamon weather in November.
As December unfolds in Bayamon, the weather takes on a unique charm compared to the warmer months. With maximum temperatures resting comfortably around 31°C and a refreshing average of 26°C, the month strikes a pleasant balance, making outdoor activities enjoyable. However, it also marks a shift towards increased humidity and frequent precipitation, with about half the month experiencing rain. This combination contributes to the lush, vibrant landscape that characterizes Bayamon at this time of year. For a deeper dive into how December fits into the overall climate, explore our comprehensive resource here: Bayamon Climate.