Last updated: August 21, 2025
In Guaruja, Brazil, December ushers in a delightful summer atmosphere characterized by warm temperatures and a vibrant coastal ambiance. With maximum highs reaching 30°C (87°F) and an average temperature of 24°C (75°F), visitors can expect plenty of sunshine interspersed with refreshing breezes. However, the month also brings increased humidity at 87% and frequent rain, totaling approximately 153 mm (6.0 in) over about 19 days. This blend of warmth and moisture sets the stage for lush landscapes and invigorating beach experiences, making December a dynamic time to explore all that Guaruja has to offer.
In December, Guaruja, Brazil, welcomes the warmth of summer with delightful temperatures that range from a minimum of 19°C (66°F) to a comfortable average of 24°C (75°F), peaking at 30°C (87°F). As the year draws to a close, the city shifts from the cooler months, showcasing a trend of increasing warmth compared to the preceding weeks. This month’s pleasant climate invites both locals and visitors to enjoy the stunning beaches and vibrant outdoor activities, making December a perfect time to bask in the Brazilian sun before the new year arrives.
In December, Guarujá experiences a moderate precipitation amount of 153 mm (6.0 in), marking a slight decline from the heavier rainfall seen in February and March but remaining consistent with the autumn months. This month typically has around 19 rainy days, echoing the high frequency of rainfall throughout the year, especially when compared to the drier winter months of July and August. As the year draws to a close, the weather in Guarujá suggests a shift back toward more abundant moisture, making December a transitional period that sets the stage for the upcoming summer rains.
In December, Guaruja, Brazil, experiences a noticeable uptick in humidity, reaching 87%, which mirrors the conditions of February and November. This trend reflects a gradual decrease from the higher levels of the beginning of the year, where humidity peaks at 89% in January. The overall pattern shows a slow yet steady decline from the high humidity of the summer months, particularly between January and August, when levels drop to their annual low of 76% in October. As December approaches, humidity begins to rise again, signaling a transition back to the more humid conditions typical of the region's warmer season.
In December, Guaruja, Brazil, experiences its peak UV Index of 15, categorizing it as extreme and leading to a rapid burn time of just 10 minutes. This trend of heightened UV exposure is notable as December mirrors the high values seen in both January and February, suggesting a persistent and intense sun presence during the peak summer months. Following a gradual decline through the mid-year, where June and July show more moderate levels of 6, the UV Index sharply escalates again from September onward, marking a return to extreme conditions as the year wraps up. It's essential for beachgoers and outdoor enthusiasts to stay informed and take precautions—check the latest updates on the Guaruja UV Index before heading out!
UV Risk Categories
In Guarujá, Brazil, December shines as a beacon of sunshine, with an impressive 317 hours of sunlight illuminating the end of the year. This marks a noticeable peak in the annual trend, as the days grow longer and warmer, leading into the summer season. Following a pattern of gradual increase, sunlight hours have steadily risen from 256 hours in January to a high of 298 hours in March, before dipping slightly through the cooler months of June and August. However, as the year culminates, the trend clearly indicates a return to radiant conditions. November, with 295 hours, sets the stage for December's brilliance, enhancing the allure of Guarujá as a sun-soaked paradise just in time for holiday celebrations.
In December, Guaruja, Brazil enjoys a 42% chance of sunny weather, positioning it favorably within the year’s monthly variations. Analyzing the trends, December's likelihood matches the pleasant conditions of February and November, suggesting a consistent pattern of sunshine as the year winds down. While it does not reach the peak of July's impressive 61%, the 42% chance still indicates a solid opportunity for sun-soaked days. Thus, visitors can look forward to enjoying the beach, with quite a reliable chance of clear skies above as the festive season approaches.
In Guarujá, Brazil, December marks a return to the longer days of summer, with approximately 13 hours of daylight. This duration mirrors the daylight experienced in January and November, creating a bright and vibrant atmosphere perfect for beach outings and outdoor activities. As the year progresses from the sun-drenched January down to the shorter days of May and June, daylight gradually decreases, reaching its low point with a steady 10 hours from June through July. However, as spring approaches, daylight begins to extend again in August and September, leading to the lush and light-filled days of late spring and early summer. Therefore, December serves as a celebration of light, inviting both locals and tourists to bask in its warm glow before the cycle begins anew.
As December rolls into Guarujá, Brazil, the coastal winds pick up slightly, averaging 3.4 m/s (8 mph), offering a gentle embrace that contrasts with the more pronounced gusts of October. Throughout the year, wind speeds have shown a gradual increase from the calmer months of early winter, peaking in October with 4.7 m/s (11 mph), before settling into a steadier rhythm as the year draws to a close. This December wind still carries the refreshing essence of summer, reminiscent of the vibrant beach days ahead, suggesting that while the winds may be lighter than in the peak autumn months, they continue to invite both local surfers and beachgoers to enjoy the rich coastal atmosphere.
Weather in Guaruja varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Guaruja, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather features warm temperatures with a minimum of 19°C (66°F) and an average of 24°C (75°F), while January sees a slight increase with a minimum of 21°C (69°F) and an average of 26°C (79°F). The maximum temperatures also rise from 30°C (87°F) in December to 32°C (90°F) in January. Precipitation is slightly higher in January with 184 mm (7.2 in) over 18 days, compared to December's 153 mm (6.0 in) over 19 days. Humidity levels remain high, increasing from 87% in December to 89% in January. For more details on January's weather, you can visit Guaruja weather in January.
In December, the weather typically features a minimum temperature of 19°C (66°F) and an average of 24°C (75°F), reaching a maximum of 30°C (87°F). This month also experiences 153 mm (6.0 in) of precipitation over 19 days, with humidity levels hovering at 87%.
In contrast, February tends to be slightly warmer, with minimum temperatures rising to 21°C (69°F) and average temperatures reaching 25°C (78°F). The maximum temperature can peak at 33°C (91°F), and precipitation increases significantly to 249 mm (9.8 in) over the same number of rainy days. Humidity remains consistent at 87%, making February a more intense month for both heat and rainfall. For more detailed information, visit Guaruja weather in February.
In December, the weather is generally warm, with temperatures ranging from a minimum of 19°C (66°F) to a maximum of 30°C (87°F) and an average of 24°C (75°F). The month also experiences significant precipitation, totaling 153 mm (6.0 in) over 19 days, coupled with high humidity at 87%. In contrast, March sees slightly warmer temperatures, with a range from a minimum of 21°C (69°F) to a maximum of 32°C (90°F) and an average of 25°C (77°F). However, it also has increased precipitation of 229 mm (9.0 in) over 20 days, while humidity remains relatively steady at 86%. For further details on the weather pattern, you can visit Guaruja weather in March.
In December, the weather tends to be slightly warmer with average temperatures reaching 24°C (75°F) and maximum highs of 30°C (87°F). The month experiences considerable rainfall, with 153 mm (6.0 in) spread over 19 days, resulting in high humidity levels of 87%. In contrast, April sees a marginally cooler average temperature of 23°C (74°F) and maximum temperatures peak at 31°C (89°F). Rainfall is somewhat less at 139 mm (5.5 in) over 15 days, accompanied by lower humidity of 84%. For more details on the climate in April, you can check Guaruja weather in April.
In December, the weather tends to be warmer, with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 30°C (87°F), while May features slightly cooler temperatures, with a minimum of 15°C (59°F) and a maximum of 29°C (84°F). Both months experience considerable precipitation, but December typically sees more rainfall, with 153 mm (6.0 in) over approximately 19 days, compared to May's 130 mm (5.1 in) over 13 days. Humidity levels are also quite high in both months, with December averaging 87% and May at 84%. For more detailed information about weather conditions in May, you can check Guaruja 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 (66°F) to a maximum of 30°C (87°F), and an average of 24°C (75°F). The precipitation is higher in December, with about 153 mm (6.0 in) spread over 19 days, resulting in a humidity level of 87%. In contrast, June experiences slightly cooler temperatures, with a minimum of 15°C (60°F) and an average of 21°C (70°F), reaching up to a maximum of 30°C (86°F). Rainfall in June is also lower, totaling 117 mm (4.6 in) over 12 days, and humidity is a bit less at 82%. For more detailed insights on June weather, visit Guaruja weather in June.
In December, the weather is typically warmer and more humid, with average temperatures ranging from a comfortable 24°C (75°F) to a peak of 30°C (87°F). This month experiences significant precipitation, accumulating around 153 mm (6.0 in) over 19 days, contributing to the humidity levels which reach 87%. In contrast, July brings cooler temperatures, with an average of 20°C (67°F) and a minimum of 11°C (53°F). This month also sees less rain, with only 81 mm (3.2 in) over just 8 days, and the humidity is slightly lower at 80%. For more details on July weather specifically, check out Guaruja weather in July.
In December, the weather is notably warmer with average temperatures ranging from 24°C (75°F) to a maximum of 30°C (87°F), compared to August, which sees a cooler average of 19°C (67°F) and a similar peak temperature of 30°C (87°F). December experiences higher humidity at 87%, making it feel more oppressive than August's 78%. Additionally, December has more rainfall, totaling 153 mm (6.0 in) over 19 days, while August sees slightly less precipitation at 133 mm (5.3 in) over 13 days. For a comprehensive overview of August weather, you can visit Guaruja weather in August.
In December, the weather is generally warmer and more humid compared to September. December features an average temperature of 24°C (75°F), with daytime highs reaching up to 30°C (87°F), while September has a slightly cooler average of 21°C (70°F) and can peak at 33°C (92°F). Precipitation is also more frequent in December, with 153 mm (6.0 in) of rain over 19 days, compared to 102 mm (4.0 in) over 13 days in September. Additionally, the humidity level rises to 87% in December, surpassing the 78% experienced in September, making the latter month feel a bit more comfortable overall. For more detailed information, you can check Guaruja weather in September.
In comparing December and October weather, December tends to be slightly warmer with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 30°C (87°F), while October experiences slightly cooler conditions, with temperatures ranging from a minimum of 17°C (62°F) to a maximum of 34°C (93°F). Interestingly, October has a higher average maximum temperature despite its overall lower average. Both months see significant rainfall, but December has slightly less at 153 mm (6.0 in) compared to October's 183 mm (7.2 in), with both months experiencing precipitation on about 19 days. Additionally, the humidity in December is higher at 87%, compared to October's more comfortable 76%. For more details on October's weather, check out Guaruja weather in October.
In November, temperatures in Guarujá typically range from a minimum of 17°C (63°F) to a maximum of 31°C (87°F), averaging around 22°C (72°F). The month experiences about 147 mm (5.8 in) of precipitation over 18 days, with humidity levels averaging 85%. In contrast, December sees slightly warmer temperatures, with a minimum of 19°C (66°F) and an average of 24°C (75°F), reaching up to 30°C (87°F). The precipitation increases to 153 mm (6.0 in) across 19 days, accompanied by a higher humidity level of 87%. Overall, while both months are humid with substantial rainfall, December tends to be warmer and slightly wetter than November. For more details, you can check Guaruja weather in November.
As December arrives in Guaruja, the weather takes on a vibrant character, contrasting sharply with the cooler months that precede it. The warmth envelops visitors, with temperatures climbing to pleasant highs, while the humidity levels rise to create a tropical atmosphere. However, rain does make an appearance, with nearly half the month seeing precipitation, adding to the lush landscape that defines this coastal paradise. For those considering a visit, the unique blend of warmth and wetness showcases Guaruja's dynamic climate, making it a fascinating month to explore. For more detailed insights, check out Guaruja Climate.