Last updated: August 21, 2025
In December, Rio San Juan, Dominican Republic experiences a tropical climate characterized by mild temperatures ranging from a maximum of 29°C (85°F) to a minimum of 23°C (74°F), with an average of 25°C (78°F). Humidity levels hover around 69%, contributing to the area's lush environment. However, this month also brings an average precipitation of 83 mm (3.3 in) over 22 days, making it a relatively wet time. Visitors should prepare for occasional rainfall but can still enjoy the warm and inviting atmosphere that defines this picturesque coastal location.
In December, the temperatures in Rio San Juan, Dominican Republic, offer a pleasant and inviting climate, with minimums around 23°C (74°F) and comfortable averages of 25°C (78°F). As the year winds down, daytime highs reach a delightful 29°C (85°F), creating an enjoyable atmosphere for both relaxation and exploration. This month marks a transition, as temperatures begin to dip slightly from the warmth of the preceding months, yet they remain consistently mild. With humidity levels starting to decrease, December is an ideal time to soak in the stunning natural beauty and vibrant culture of this Caribbean paradise, making it a perfect escape from colder climates.
December in Rio San Juan, Dominican Republic, brings a notable shift in weather patterns, with an average precipitation of 83 mm (3.3 in) spread over 22 days. This marks a slight reduction from the wetter months preceding it, reflecting the tail end of the rainy season. The transition into December typically showcases a mix of pleasant sunny days interspersed with refreshing rain showers, characteristic of the region's tropical climate. As the year wraps up, those seeking to explore the lush natural landscapes of the area will find that while the rain is less intense than in September's peak, the consistent moisture contributes to the vibrant greenery, making it an ideal time for nature enthusiasts to enjoy the rich biodiversity of the region.
December in Rio San Juan, Dominican Republic, brings a noticeable shift in humidity levels, with an average of 69%. This month marks a slight increase from the lower humidity levels recorded earlier in the year, particularly hitting a low of 57% during May and June. As we transition into the holiday season, humidity levels steadily rise, peaking during the humid months of September through November at 72%. Interestingly, December's humidity is a balance between the wetter summer months and the drier early year, creating a unique climate that maintains the lush tropical ambiance characteristic of this beautiful region.
In December, the UV Index in Rio San Juan, Dominican Republic, measures 8, placing it in the very high exposure category with a burn time of 15 minutes. This gradual decline from the extremes seen in earlier months highlights a slight reprieve as the year winds down. However, it's essential to remain cautious, as months like January and February escalate back to extreme levels, with indices soaring to 11 and 11, respectively. Overall, throughout the year, the UV Index consistently trends high, peaking at an alarming 13 from March through August, urging residents and visitors alike to prioritize sun protection. For further details, visit the Rio San Juan UV Index.
UV Risk Categories
In December, Rio San Juan, Dominican Republic, continues to bask in the glow of nearly 314 hours of sunshine, making it a delightful escape as the year winds down. This month isn't just a bright spot in the calendar; it reflects the region's overall sunny charm, which peaks during the warmer months. From January's modest 251 hours to June’s high of 355 hours, the trend showcases a steady increase in daylight, culminating in a sun-drenched July that averages 361 hours. As the year progresses into fall, the sunshine hours dip slightly, but December remains vibrant, maintaining a warmth that invites visitors to revel in outdoor activities and stunning vistas. With a consistent range of daylight throughout the year, Rio San Juan stands as a beacon for sun-seekers and nature lovers alike.
As December rolls into Rio San Juan, the likelihood of enjoying sunny weather becomes quite promising, with a 62% chance of sunshine illuminating the landscape. This month sees a noticeable upward trend compared to the preceding months—especially when contrasted with the gray skies of June and August, which only boasted 37% and 38% respectively. In fact, December stands as one of the sunniest months towards year-end, enhancing its appeal for visitors and residents alike. Following a relatively dry November at 60%, December's favorable forecast signals a delightful transition into the holiday season, perfect for outdoor adventures and vibrant celebrations under the sun.
In Rio San Juan, Dominican Republic, the daylight duration exhibits a predictable rhythm throughout the year. Starting strong in the early months of the year with a consistent 11 hours of daylight in both January and February, the days gradually stretch, peaking at 13 hours during the vibrant summer months of May through July. As summer fades, daylight gradually recedes, mirroring the ebbing energy of the season. By December, residents and visitors experience a more subdued 10 hours of daylight, marking the shortest days of the year. This natural cycle not only highlights the region's tropical charm but also sets the pace for the activities that thrive under the radiant sun.
In December, the winds in Rio San Juan breathe a gentle rhythm, with an average speed of 4.8 m/s (11 mph). As the year comes to a close, there's a subtle decline in wind intensity compared to the summer months, which peak in July at 5.8 m/s (13 mph). The trend shows a gradual decrease from the breezier conditions of early summer, tapering down through the fall. While December is calmer, it still offers a pleasant breeze, ideal for leisurely beach strolls and tranquil afternoons by the waves. This shift marks a transition into a more tranquil winter, where the winds are mild yet still invigorating, encapsulating the serene charm of the Dominican Republic’s coastline during this festive season.
Weather in Rio San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rio San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather in Rio San Juan is characterized by warmer temperatures, with a minimum of 23°C (74°F) and a maximum of 29°C (85°F), while January sees slightly cooler conditions with a minimum of 21°C (71°F) and a maximum of 28°C (82°F). Both months share an average temperature of around 25°C (77°F), but December experiences more precipitation, totaling 83 mm (3.3 in) over 22 days, compared to January's 66 mm (2.6 in) over just 15 days. Additionally, December has a higher humidity level at 69%, while January's humidity drops to 65%. For more detailed insights, you can check out Rio San Juan weather in January.
When comparing the weather in December to February, both months present warm temperatures with only slight variations. December enjoys an average temperature of 25°C (78°F), with a minimum of 23°C (74°F) and a maximum of 29°C (85°F). In contrast, February's temperatures closely follow suit, averaging 25°C (76°F) and peaking at 28°C (83°F) with a minimum of 21°C (69°F).
However, December experiences more precipitation, totaling 83 mm (3.3 in) over about 22 days, while February sees a decrease to 70 mm (2.7 in) across 20 days. The humidity also remains higher in December at 69%, compared to February's 63%. Overall, February tends to be slightly drier and cooler, making it a comfortable choice for visitors. For more details on February weather in this region, you can check out Rio San Juan weather in February.
In December, the weather is typically warm with average temperatures ranging from a minimum of 23°C (74°F) to a maximum of 29°C (85°F). This month receives an average of 83 mm (3.3 in) of precipitation over 22 days, resulting in a relatively humid environment with 69% humidity. In contrast, March sees slightly cooler temperatures, with a minimum of 21°C (71°F) and a maximum of 28°C (83°F), while maintaining a similar average of 25°C (76°F). However, March experiences more rainfall, totaling 112 mm (4.4 in) over 18 days, but with lower humidity at 59%. For more detailed insights, check out Rio San Juan weather in March.
In December, temperatures in Rio San Juan exhibit a warm range, with minimums around 23°C (74°F) and maximums reaching 29°C (85°F). The month experiences significant rainfall, averaging 83 mm (3.3 in) over 22 days, contributing to a humidity level of 69%. In contrast, April presents similar average temperatures, remaining steady at 25°C (78°F), but with a slightly lower maximum of 29°C (84°F) and a minimum of 22°C (72°F). Precipitation in April decreases to 68 mm (2.7 in) over 17 days, resulting in a lower humidity of 58%. For more detailed insights on the weather in April, you can check out Rio San Juan weather in April.
In December, the weather in Rio San Juan features a minimum temperature of 23°C (74°F) and an average of 25°C (78°F), while the maximum reaches 29°C (85°F). This month sees around 83 mm (3.3 in) of precipitation over 22 days, contributing to a higher humidity level of 69%. Conversely, May presents a slightly warmer climate with temperatures ranging from a minimum of 22°C (72°F) to an average of 26°C (79°F) and a maximum of 30°C (86°F). Precipitation is slightly lower at 81 mm (3.2 in) over 19 days, accompanied by a more comfortable humidity level of 57%. For more detailed insights, check out Rio San Juan weather in May.
In comparing December and June weather in Rio San Juan, it's evident that both months feature warm temperatures, with December experiencing a slightly lower average of 25°C (78°F) compared to June's 27°C (81°F). December sees a minimum temperature of 23°C (74°F), while June starts off a bit higher at 24°C (76°F). Although both months have maximum temperatures peaking at 29°C (85°F), December is marked by higher precipitation levels of 83 mm (3.3 in) over 22 days, contrasting with June’s 60 mm (2.4 in) over 19 days. Moreover, the humidity is notably higher in December at 69%, compared to June's 57%. For a detailed look at what to expect in June, you can check out Rio San Juan weather in June.
In December, the weather in Rio San Juan features a minimum temperature of 23°C (74°F) and averages around 25°C (78°F), peaking at a maximum of 29°C (85°F). The month experiences significant humidity at 69% and receives about 83 mm (3.3 in) of precipitation over 22 days. In contrast, July sees slightly warmer temperatures, with a minimum of 24°C (76°F) and an average of 27°C (81°F), reaching a maximum of 30°C (87°F). This month also has higher rainfall, totaling 103 mm (4.1 in) over 23 days, but slightly lower humidity at 63%. For more detailed information, see Rio San Juan weather in July.
When comparing the weather between December and August, we see some notable differences. In December, temperatures range from a minimum of 23°C (74°F) to a maximum of 29°C (85°F), with an average of 25°C (78°F). The month experiences about 83 mm (3.3 in) of precipitation spread over 22 days, with humidity levels at 69%. In contrast, August tends to be slightly warmer, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 31°C (88°F) and an average of 27°C (82°F). This month also sees a higher precipitation amount of 99 mm (3.9 in), while maintaining a similar number of rainy days at 22 and a marginally higher humidity level of 71%. For more details, you can check out Rio San Juan weather in August.
In comparing the weather of December and September, we see distinct differences in both temperature and precipitation patterns. December features slightly cooler temperatures, with an average of 25°C (78°F) compared to September's warmer average of 27°C (82°F). The maximum temperatures in December reach 29°C (85°F), while September can peak at 31°C (88°F).
However, September experiences significantly higher rainfall, totaling 145 mm (5.7 in) over 20 days, in contrast to December's 83 mm (3.3 in) over 22 days. Humidity levels are also higher in September at 73%, compared to 69% in December. For more detailed weather insights specific to September, you can check Rio San Juan weather in September.
In comparing the weather between December and October, we see that October tends to be slightly warmer with average temperatures reaching 27°C (81°F) and a maximum of 30°C (87°F), while December has a lower average temperature of 25°C (78°F) and a peak of 29°C (85°F). However, October also experiences more precipitation, totaling 102 mm (4.0 inches) compared to December's 83 mm (3.3 inches), which both fall over approximately 22 days. Humidity levels are quite similar, with December at 69% and October at 72%. For more detailed information on October weather, you can visit Rio San Juan weather in October.
In comparing the weather conditions of December and November, we see that December experiences slightly cooler temperatures, with average highs reaching 29°C (85°F) compared to November's 30°C (86°F). Additionally, December has a lower average temperature overall, with a minimum of 23°C (74°F) against November's 24°C (75°F). Precipitation is also notably less in December, totaling 83 mm (3.3 in) over 22 days, while November sees higher rainfall of 110 mm (4.3 in) over just one fewer day of precipitation. Humidity levels are marginally lower in December at 69%, compared to 72% in November. For more detailed information on November weather, you can refer to this link: Rio San Juan weather in November.
As December unfolds in Rio San Juan, the weather greets visitors with a mild embrace, featuring pleasantly warm temperatures that are a welcome change from the hotter summer months. With an average warmth of around 25°C, the air becomes comfortably humid, ideal for exploring the lush surroundings. However, December also marks a shift toward increased rainfall, with cloudy days and about 22 days of precipitation, adding a refreshing touch to the tropical landscape. This blend of warmth and moisture creates a unique atmosphere that distinguishes December from the drier, hotter months. For a deeper dive into the annual weather patterns, check out Rio San Juan Climate.