Last updated: August 31, 2025
In December, Humacao, Puerto Rico, experiences a warm tropical climate characterized by an average temperature of 26°C (78°F), with daytime peaks reaching a comfortable 29°C (85°F) and nighttime lows dropping to 23°C (73°F). Despite the overall warmth, this month brings a notable 81 mm (3.2 in) of rainfall spread over 24 days, resulting in a humid environment with humidity levels around 76%. Visitors can expect a mix of sunny days and occasional showers, creating a vibrant atmosphere perfect for exploring the local scenery and enjoying the lush landscapes.
In December, the temperatures in Humacao, Puerto Rico gently settle into a pleasantly mild rhythm, with minimums around 23°C (73°F) and averages reaching 26°C (78°F). The maximums consistently peak at 29°C (85°F), mirroring the warmth of earlier months, yet hinting at the cooler embrace of winter approaching. This month marks a transition from the warmer heights of summer, as the consistent warmth continues to draw in visitors seeking a sunny escape. The overall climate remains inviting, with temperatures subtly shifting downwards from the highs of previous months, making December an ideal time to enjoy both the vibrant outdoors and the festive spirit of this picturesque locale.
In December, Humacao, Puerto Rico, experiences a moderate precipitation amount of 81 mm (3.2 in), marking a decline from the heavier rains of the preceding months. With 24 days of rainfall, December maintains a consistent trend of wet weather as it transitions from the peak rainy season, which culminates in September's 195 mm (7.7 in), followed by a gradual taper in precipitation through the end of the year. This month stands out with significantly less rainfall compared to the summer months, where averages soared above 140 mm, yet it retains a balance that keeps the lush landscape vibrant. Overall, December encapsulates a time of shifting weather patterns as the year winds down, providing a final splash of rain before the drier season approaches.
In December, Humacao, Puerto Rico experiences a humidity level of 76%, which reflects a slight decrease from the previous month's 78%. This fluctuation is part of a broader trend observed throughout the year, where humidity peaks during the warmer summer months of July and August at 80%, while the cooler months maintain a more stable range. As the year transitions from the dry season of January to the more humid summer, December's moisture level remains relatively consistent, hinting at the region's tropical climate. The slight dip in December compared to the fall months displays a subtle shift towards the milder winter conditions that the area enjoys, ensuring residents and visitors alike can appreciate the comfortable, yet slightly humid, end-of-year weather.
During the month of December, Humacao, Puerto Rico experiences a UV Index of 8, categorized as very high, with a burn time of just 15 minutes. This marks a slight decrease from the peak UV levels seen in the summer months, particularly September, which boasts an extreme index of 14. Despite the drop, December still reflects the broader trend of elevated UV exposure throughout the year, with most months, such as March to August, consistently hitting 13. As you plan your activities, be sure to stay informed about the UV levels for safe sun exposure. For more details, check out the comprehensive Humacao UV Index.
UV Risk Categories
December in Humacao, Puerto Rico, delights sun-seekers with approximately 320 hours of glorious sunshine, marking a fitting conclusion to the year. As the months progress from January's 258 hours to December's robust total, there’s a clear trend of increasing sunlight, peaking in May with 357 hours. This gradual buildup not only highlights the island's charming transition into the warmer months but also signals an inviting atmosphere perfect for outdoor activities. While December may not reach the summer’s zenith, it maintains a splendid brightness, offering a vibrant backdrop for holiday festivities and beach relaxation, embodying the idyllic allure of Puerto Rican winters.
In December, Humacao, Puerto Rico enjoys a favorable chance of sunshine, with a 59% likelihood of clear skies, marking a pleasant start to the winter season. This figure reflects a slight increase from November's 57%, suggesting that the month is leaning towards sunnier days as the year comes to a close. Moreover, compared to the peak sunshine months of February (65%) and March (61%), December offers a gratifying balance between warmth and occasional cloud cover. While not the sunniest month, the weather trends indicate a generally bright December, making it an appealing time for visitors seeking warmth and vibrancy amidst the winter chill elsewhere.
In Humacao, Puerto Rico, the daylight duration showcases a beautiful rhythm throughout the year. Starting in January and February, residents enjoy a consistent 11 hours of daylight, which extends to 12 hours from March to May, inviting longer evenings and more outdoor activities as spring arrives. Come June and July, daylight reaches its peak at 13 hours, perfect for embracing the vibrant summer days. As summer fades into autumn, daylight gradually shortens, returning to 12 hours in August and September, then tapering back to 11 hours once again by October and November. Consequently, December rings in the season with a familiar 11 hours of daylight, creating a harmonious cycle that reflects both the allure of tropical living and the subtle changes of time.
In December, Humacao, Puerto Rico experiences a refreshing average wind speed of 4.4 m/s (10 mph), marking a notable trend as it transitions into the winter months. This gentle breeze is a part of a seasonal pattern where wind conditions fluctuate throughout the year. Notably, December's wind speed aligns closely with the averages seen in March and August, suggesting a mild consistency as residents and visitors alike enjoy the pleasant coastal climate. As the year concludes, the winds remain comparatively stronger than earlier months like September, emphasizing the natural ebb and flow of the island's breezy charm during winter.
Weather in Humacao varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Humacao, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather tends to be slightly warmer with average temperatures ranging from a minimum of 23°C (73°F) to a maximum of 29°C (85°F), along with higher precipitation of 81 mm (3.2 in) spread over 24 days. The humidity levels remain fairly high at 76%. In contrast, January sees a slight drop in temperature, with averages going from a minimum of 21°C (70°F) to a maximum of 28°C (83°F) and a decrease in precipitation to 57 mm (2.3 in) over 17 days, while humidity remains consistent at 76%. For a more detailed look at January weather, you can check out Humacao weather in January.
December and February exhibit relatively similar weather patterns, though notable differences can be observed. In December, temperatures range from a minimum of 23°C (73°F) to a maximum of 29°C (85°F), with an average of 26°C (78°F). This month experiences more precipitation, totaling 81 mm (3.2 in) across 24 rainy days, and maintains a humidity level of 76%. In contrast, February sees slightly cooler temperatures, with a minimum of 21°C (70°F) and a maximum of 27°C (81°F), averaging 24°C (76°F). Precipitation decreases to 61 mm (2.4 in) over 21 days, and humidity levels dip slightly to 75%. For more details about February weather specifically, check out Humacao weather in February.
In December, the weather is characterized by slightly warmer temperatures, with minimums around 23°C (73°F) and averages reaching 26°C (78°F). The month experiences an average maximum temperature of 29°C (85°F) and receives about 81 mm (3.2 in) of precipitation over 24 days, resulting in a higher humidity level of 76%.
In contrast, March shows a slight decrease in temperatures with minimums at 22°C (72°F) and average temperatures around 25°C (76°F). The maximum temperature in March is slightly lower at 28°C (82°F), while precipitation levels drop to around 78 mm (3.1 in) over 22 days, leading to a marginally lower humidity of 74%.
For more details, check out Humacao weather in March.
In December, temperatures range from a minimum of 23°C (73°F) to a maximum of 29°C (85°F), with an average of 26°C (78°F). The month experiences higher precipitation, totaling 81 mm (3.2 in) over 24 days, accompanied by a humidity level of 76%. In contrast, April sees slightly cooler temperatures, with a minimum of 22°C (71°F) and an average of 25°C (77°F), peaking at 29°C (84°F). Precipitation levels in April are similar, at 79 mm (3.1 in) but occur over fewer days, 20 in total, with humidity slightly lower at 75%. For more detailed information, visit Humacao weather in April.
When comparing the weather in December and May, both months exhibit similar temperature ranges, with minimums around 23°C (73°F), average temperatures at 26°C (79°F), and maximums reaching up to 29°C (85°F). However, May tends to be slightly wetter, with a total precipitation of 109 mm (4.3 in) over 26 days, compared to December's 81 mm (3.2 in) across 24 days. Additionally, humidity levels are quite close, with December at 76% and May slightly lower at 75%. For more detailed information on May weather specifics, you can visit Humacao weather in May.
In December, the weather features slightly cooler temperatures, with averages around 26°C (78°F) and maximums reaching 29°C (85°F). The month experiences moderate precipitation, totaling 81 mm (3.2 in) across about 24 days, along with a humidity level of 76%. In contrast, June brings warmer conditions, with average temperatures of 27°C (80°F) and highs of 30°C (87°F). It also sees increased rainfall, measuring 110 mm (4.3 in) over approximately 26 days, while humidity rises slightly to 77%. For more details on the weather conditions in June, you can visit Humacao weather in June.
In December, the weather in Humacao features a range of temperatures from a minimum of 23°C (73°F) to a maximum of 29°C (85°F), with an average of 26°C (78°F). This month sees 81 mm (3.2 in) of precipitation spread across 24 rainy days, coupled with a humidity level of 76%. In contrast, July experiences slightly warmer temperatures, with a minimum of 24°C (75°F) and a maximum of 30°C (86°F), averaging 27°C (81°F). However, it also brings increased rainfall, with 149 mm (5.9 in) of precipitation over 27 days and a higher humidity of 80%. For more details on July weather specifically, you can refer to Humacao weather in July.
In comparing the weather between December and August, we see that both months experience warm temperatures, but August is generally warmer, with average temperatures reaching up to 27°C (82°F) compared to December's 26°C (78°F). The maximum temperatures in August also slightly exceed those in December, peaking at 30°C (87°F) versus December's 29°C (85°F). Precipitation is notably higher in August, with 153 mm (6.0 in) falling over 27 days, compared to December's 81 mm (3.2 in) over 24 days. Additionally, August tends to have a slightly higher humidity level at 80%, compared to December's 76%. For more specifics on August weather, you can check out Humacao weather in August.
When comparing the weather in December and September, we can observe several notable differences. December tends to be slightly cooler, with an average temperature of 26°C (78°F), whereas September is warmer with an average of 27°C (82°F). September also experiences higher maximum temperatures, peaking at 31°C (88°F) compared to December's maximum of 29°C (85°F). Additionally, September is notably wetter, receiving 195 mm (7.7 in) of rainfall over 28 days, while December has only 81 mm (3.2 in) over 24 days. Both months have high humidity levels, but September's average humidity is marginally higher at 79%. For a closer look at September's weather specifics, you can visit Humacao weather in September.
When comparing the weather in December and October, December tends to be slightly cooler, with average temperatures ranging from a minimum of 23°C (73°F) to a maximum of 29°C (85°F), while October boasts slightly warmer conditions with an average min of 24°C (75°F) and a max of 30°C (87°F). Precipitation also varies significantly, as December experiences 81 mm (3.2 in) of rain over 24 days, whereas October sees a much higher total of 187 mm (7.4 in) over 26 days. Humidity levels are relatively similar, with December at 76% and October at 78%. For more detailed information about October's weather, you can visit Humacao weather in October.
In comparing the weather between December and November, both months feature similar temperature ranges, with minimums around 23°C (73°F) and maximums reaching up to 29°C (85°F). However, December tends to be slightly drier, with only 81 mm (3.2 in) of precipitation over 24 days, compared to November's 131 mm (5.2 in) over 25 days. The humidity levels are also slightly lower in December at 76%, compared to 78% in November. For more detailed insights into the climate, check out Humacao weather in November.
As December rolls in, Humacao's weather shifts to a milder and more humid climate, contrasting with the warmer months. With temperatures averaging around 26°C (78°F), the pleasant warmth invites both residents and visitors to explore the area's natural beauty. However, this month also brings increased precipitation, with rain gracing the region on nearly every other day, creating a lush landscape. Despite the rain, the ambiance remains inviting, making December a unique and refreshing time to experience Humacao's charm. For a deeper dive into the local climate, you can visit Humacao Climate.