Last updated: August 21, 2025
Experience Niteroi, Brazil in December, where warm, tropical weather sets the stage for a vibrant summer atmosphere. With maximum temperatures reaching a sizzling 33°C (92°F) and an average of 25°C (78°F), visitors can enjoy plenty of sunshine. However, be prepared for some refreshing showers, as December receives an average of 121 mm (4.8 in) of rain over about 15 days, contributing to the region's lush surroundings. The humidity levels hover around 75%, enhancing the sultry vibe typical of this coastal paradise. Whether you're exploring the stunning beaches or indulging in local cuisine, December in Niteroi promises an unforgettable tropical experience.
In Niteroi, Brazil, December ushers in warm and inviting temperatures, making it an ideal month for outdoor activities. The month begins with a minimum of 19°C (67°F), rising to an average of 25°C (78°F) and peaking at a comfortable 33°C (92°F). Compared to the preceding months, December sees a notable warmth, especially when contrasted with the cooler temperatures of winter. This gradual shift from mild autumn temperatures to the warmth of summer reflects a consistent increase that has been building through the year, creating a delightful climate that beckons both locals and tourists to enjoy Niteroi’s stunning beaches and vibrant city life as the holiday season approaches.
In December, Niteroi, Brazil, typically experiences a notable uptick in rainfall, with an average precipitation of 121 mm (4.8 in) over 15 days. This slight increase from the previous month reflects the onset of the rainy season, which often sees a transitional pattern of heavier showers. Notably, December's precipitation is among the highest for the year, closely mirroring the wet months of February and March, which receive significant rainfall as well. The combination of increased moisture and frequency of rainy days in December sets the stage for a lush, vibrant landscape as the year comes to a close.
December in Niteroi, Brazil, showcases a moderate humidity level of 75%, marking a slight increase from the drier months of October and November. As the year winds down, humidity begins to rise from its low of 61% in October, reflecting the transition towards the more humid summer months. Interestingly, this trend showcases a peak in humidity levels during the early part of the year, with January and February both reaching 85%. As the seasons shift, humidity gradually decreases, hitting its lowest point in August at 73%. December stands as a reminder of the region's persistent tropical influence, providing a comfortable and refreshing atmosphere as the heat of summer approaches.
As December rolls into Niteroi, Brazil, residents and visitors should brace for another month of extreme UV exposure. With a staggering UV Index of 15, it's critical to take precautions, as the burn time is a mere 10 minutes. This trend of high UV levels peaks during the summer months, with January and February also recording extreme indices. Notably, the transition into autumn sees a slight decrease in UV intensity, with indices dipping to 10 in April and then gradually rising again through the spring. By December, however, the extreme conditions return, underscoring the need for sun safety practices throughout the year. For more on managing UV exposure, visit Niteroi UV Index.
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December in Niteroi, Brazil, shines particularly bright, boasting 318 hours of glorious sunshine, making it one of the sunniest months of the year. This trend of abundant daylight is a delightful crescendo as the year draws to a close; throughout the preceding months, sunshine hours steadily increased from 270 in January to December's peak. Each month shows a general rise, with March and April holding strong averages near 300 hours, while even the cooler months of June and July remain well-lit, hovering around 276 to 290 hours. The consistent warmth and brightness in December create a vibrant atmosphere, perfect for enjoying the beautiful beaches and outdoor festivities Niteroi is known for. As 2023 wraps up, the city's sun-filled days invite both locals and visitors to bask in the joy of this radiant season.
In December, Niteroi, Brazil, enjoys a 42% chance of sunny weather, making it a delightful time to experience the warm beach vibes of summer. While this percentage is higher than the sunniest months in the initial part of the year like January (36%) and February (33%), it lags behind the peak sunshine of mid-year, where July and August boast impressive chances of sun at 58% and 60% respectively. Interestingly, the transition towards the end of the year reveals an overall trend of increasing sunshine, as the probability steadily climbs from October's low of 20% to December’s moderate levels. This pattern highlights a gradual shift into more favorable weather, foreshadowing the vibrant summer days that Niteroi is known for.
In Niteroi, Brazil, December brings a delightful return to longer days, with 13 hours of daylight that mirror the brightness of January and November. As the year progresses from summer to winter, daylight hours gradually decline to a low of 10 hours in the heart of winter (June to August), before slowly ascending again. Interestingly, the transition periods in early spring and late autumn showcase a balanced 11 to 12 hours of daylight, creating a pleasant rhythm of light that enhances the city’s vibrant atmosphere. Thus, December stands as a highlight, inviting residents and visitors alike to bask in the extended sunlight before the country shifts back into shorter days as the year unfolds.
As the year draws to a close, December in Niteroi embraces a gentle embrace of winds, with an average speed of 3.0 m/s (7 mph). This month sees a slight dip compared to the breezier spells of previous months, but it still retains the characteristic warmth of Brazilian summer. Notably, November's winds were a bit stronger at 3.3 m/s, creating a transition from the more refreshing gusts experienced in the peak of spring and early summer. Overall, the wind patterns throughout the year reflect a dynamic dance, with August and October boasting the strongest breezes, peaking at 4.0 - 4.2 m/s (9 mph). Despite December's calmness, the gradual increase in wind speeds from the earlier months leads to an invigorating end-of-year atmosphere, perfect for enjoying Niteroi’s stunning coastal views.
Weather in Niteroi varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Niteroi, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, temperatures range from a minimum of 19°C (67°F) to a maximum of 33°C (92°F), with an average temperature of 25°C (78°F). The month sees significant precipitation, averaging 121 mm (4.8 in) over 15 days and a humidity level of 75%. In contrast, January experiences slightly warmer temperatures with a minimum of 21°C (70°F) and a maximum of 34°C (94°F), averaging 27°C (81°F). While January has lower precipitation at 91 mm (3.6 in) spread over 11 days, the humidity increases to 85%. For more detailed information, you can visit Niteroi weather in January.
In comparing the weather of December and February, both months showcase warm temperatures, but February is generally hotter. December has minimum temperatures around 19°C (67°F) and averages of 25°C (78°F), while February starts at a higher minimum of 21°C (71°F) and averages 27°C (80°F). Though precipitation levels are similar, with December seeing 121 mm (4.8 in) and February slightly lower at 119 mm (4.7 in), February experiences higher humidity at 85% compared to December's 75%. For more detailed information, you can visit Niteroi weather in February.
In December, temperatures range from a minimum of 19°C (67°F) to a maximum of 33°C (92°F), with an average of 25°C (78°F). The month experiences about 121 mm (4.8 in) of precipitation over 15 days and has a relative humidity of 75%. In contrast, March sees slightly higher temperatures, with a minimum of 20°C (69°F) and a maximum of 34°C (94°F), averaging 27°C (80°F). Additionally, March experiences an increase in rainfall, totaling 138 mm (5.4 in) over 16 days, along with a higher humidity level of 86%. For more details on the weather in March, you can learn more about Niteroi weather in March.
In December, temperatures range from a mild minimum of 19°C (67°F) to a maximum of 33°C (92°F), with an average around 25°C (78°F). The month sees significant rainfall, totaling 121 mm (4.8 inches) over about 15 days, accompanied by a humidity level of 75%. In contrast, April experiences a slightly warmer maximum temperature of 34°C (93°F) while maintaining the same minimum and average temperatures. Precipitation decreases to 81 mm (3.2 inches) over 14 days, and humidity rises to 83%. For more details on the weather in April, you can check this link: Niteroi weather in April.
In December, the weather is typically warmer with average temperatures ranging from a minimum of 19°C (67°F) to a maximum of 33°C (92°F), contrasted with May's cooler average of 16°C (61°F) to 33°C (91°F). December experiences more precipitation, totaling 121 mm (4.8 in) over about 15 days, while May sees 73 mm (2.9 in) spread across 10 days. Additionally, humidity levels are slightly higher in May at 81%, compared to 75% in December. For more detailed information about the weather conditions in May, you can visit Niteroi weather in May.
In December, the weather tends to be warmer and more humid compared to June, with average temperatures ranging from a minimum of 19°C (67°F) to a maximum of 33°C (92°F). December also experiences higher precipitation, totaling 121 mm (4.8 in) over about 15 days, contributing to a humidity level of 75%. Conversely, June is cooler, with temperatures varying from a minimum of 16°C (62°F) to a maximum of 31°C (89°F). The month sees significantly less rainfall, with only 39 mm (1.5 in) over 9 days and a slightly higher humidity level of 80%. For more details, visit Niteroi weather in June.
December and July present contrasting weather patterns. In December, temperatures are generally warmer, ranging from a minimum of 19°C (67°F) to a maximum of 33°C (92°F), with an average of 25°C (78°F). The month also sees considerable rainfall, with 121 mm (4.8 in) spread over about 15 days, leading to a humid environment at 75%. In contrast, July experiences cooler temperatures, with a minimum of 15°C (59°F) and a maximum of 32°C (90°F), averaging 21°C (71°F). The precipitation is significantly lower at 35 mm (1.4 in) over just 6 days, contributing to a slightly higher humidity level of 76%. For more details on the weather in July, visit Niteroi weather in July.
The weather in December tends to be warmer and more humid compared to August. During December, temperatures range from a minimum of 19°C (67°F) to a maximum of 33°C (92°F), with an average of 25°C (78°F), while August experiences cooler temperatures with a minimum of 14°C (58°F) and a maximum of 32°C (90°F), averaging 21°C (71°F). Additionally, December is notably wetter, receiving 121 mm (4.8 in) of precipitation over 15 days, compared to August's 68 mm (2.7 in) over 11 days. Humidity levels are relatively similar, with December at 75% and August at 73%. For those curious about the climate specifics during August, more details can be found here: Niteroi weather in August.
In comparing the weather of December and September, December tends to be slightly warmer, with average temperatures around 25°C (78°F) compared to September's 23°C (74°F). However, September can experience higher maximum temperatures, peaking at 34°C (94°F), while December's maximum is 33°C (92°F). Precipitation levels in December are significantly higher, averaging 121 mm (4.8 in) over about 15 days, while September sees only 48 mm (1.9 in) over 8 days. Additionally, December has a higher humidity level at 75%, compared to 68% in September. For more details, you can check the Niteroi weather in September.
In comparing the weather in December and October, notable differences emerge. December features a slightly higher average temperature of 25°C (78°F) compared to October's 24°C (75°F), with minimums of 19°C (67°F) and 17°C (63°F), respectively. However, October boasts a higher maximum temperature, peaking at 36°C (97°F), while December reaches a maximum of 33°C (92°F). Precipitation is also greater in December, with 121 mm (4.8 in) over 15 days, contrasted with October's 86 mm (3.4 in) across 14 days. Humidity levels are elevated in December at 75%, while October experiences a more comfortable 61% humidity. For more specifics on October weather, check Niteroi weather in October.
In comparing the weather between November and December, December generally experiences slightly warmer temperatures. The minimum temperature in December is 19°C (67°F) compared to November's 18°C (64°F), while the average temperature rises to 25°C (78°F) in December, up from 24°C (75°F) in November. Interestingly, December also sees a higher maximum temperature of 33°C (92°F) compared to November's peak of 34°C (94°F). Precipitation remains comparable, with December recording 121 mm (4.8 in) over 15 days, slightly more than November's 115 mm (4.5 in) across 16 days. Additionally, humidity is a bit higher in December at 75% versus November's 72%. For more detailed information, you can check Niteroi weather in November.
As December rolls into Niteroi, the city transforms into a vibrant haven of warmth and humidity, making it a standout month compared to the rest of the year. The temperatures soar, offering a delightful blend of sultry days and cooler evenings, ideal for evenings by the waterfront. However, this charm is occasionally interrupted by rain, with about half the month experiencing some precipitation. The lush, green surroundings thrive under the 75% humidity, adding to the lively atmosphere. For those interested in a more detailed look at how Niteroi's weather behaves throughout the year, feel free to explore Niteroi Climate.