Last updated: August 21, 2025
In December, Santarém, Brazil, experiences a tropical climate characterized by maximum temperatures reaching up to 34°C (93°F) and an average of 27°C (81°F), providing the warmth typical of the season. However, the month also brings considerable precipitation, with 359 mm (14.1 in) of rainfall spread across 27 days, resulting in a humidity level of roughly 69%. This combination of heat and moisture contributes to lush landscapes, making December a vibrant time to explore the natural beauty of the region, despite the frequent showers.
In December, Santarem, Brazil embraces the summer heat with temperatures that reflect a pattern of warmth and humidity characteristic of the region. The month kicks off with a comfortable minimum of 23°C (74°F), rising to an average of 27°C (81°F), and peaking at 34°C (93°F). This trend showcases a consistency in warmer nights and increasingly hotter days, as direct comparisons reveal a slight uptick in daytime highs from previous months. As the year rounds off, Santarem’s tropical climate invites both locals and visitors to enjoy vibrant outdoor activities under the sun, making it a delightful time to experience the natural beauty and lively culture of this Amazonian gem.
December in Santarém, Brazil, marks a significant return to wet weather, with precipitation levels reaching 359 mm (14.1 in) over 27 days. This month mirrors rainfall seen earlier in the year, similar to May’s totals, and showcases a notable uptick after the drier months of June through August, where precipitation plummeted to just 79 mm (3.1 in) in August. As the wet season continues to take hold, December serves as a bridge, leading into the even wetter conditions typical of early in the year. This is evident as Santarém transitions from a relatively parched late year atmosphere to a vibrant tapestry of rain, preparing the landscape for the lush growth that follows.
In December, Santarem experiences a notable rise in humidity, reaching a level of 69%. This increase is part of a broader trend observed from the drier months of October and November, which saw humidity levels drop to their lowest at 38% and 39% respectively. As the year transitions towards the tropical summer, humidity levels rebound significantly from the dry conditions of previous months, creating a more humid atmosphere that paves the way for the upcoming rainy season. Notably, this month's humidity is considerably lower than earlier in the year, especially from the peak in May at 90%, indicating a dynamic climate that shifts with the seasons.
In Santarem, Brazil, the UV Index in December remains consistently high at 13, categorizing it as extreme and indicating a burn time of just 10 minutes. This trend follows a pattern observed throughout the year, with similar extreme levels persisting from January to March, where the index peaks at 16. Even during the cooler months, such as June and July, the UV levels stay remarkably elevated, ranging from 11 to 12. As the year closes, December's UV Index aligns with the figures recorded in late fall, reinforcing the importance of sun protection year-round. For more detailed information, visit the Santarem UV Index.
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In December, Santarem, Brazil, enjoys a delightful 284 hours of sunshine, adding a warm glow to the festive season. The month wraps up a remarkable year of sunshine, peaking in the mid-summer months of July and August with an impressive 337 and 341 hours respectively. As the year progresses, sunlight tends to be abundant, with the lowest sunshine recorded in January at 235 hours, gradually rising towards the mid-year peak. This consistent increase hints at the tropical allure of Santarem, making December not just a transition into the new year, but also a time to bask in the tropical sun, evoking feelings of warmth and celebration.
In Santarem, Brazil, December marks a significant dip in the likelihood of sunny weather, with only a 10% chance of sunshine. This decline is part of a broader trend observed as the year progresses, where the sunny probabilities hit their peak during the mid-year months, particularly in July and August, boasting nearly 50% sunshine likelihood. As we move into the latter months, particularly in October and November, the chances start to decrease sharply, culminating in December's rather dreary forecast. This pattern suggests that visitors planning a trip during this time may want to prepare for overcast skies rather than embrace the sun.
In Santarem, Brazil, daylight duration showcases a fascinating consistency throughout the year, with a striking pattern emerging as the seasons shift. From January to April, residents enjoy a generous 12 hours of daylight, creating vibrant environments and fostering outdoor activities. As May rolls around, daylight slightly decreases to 11 hours, a trend that continues through June and July, hinting at the subtle transition into the cooler months. However, this dip in daylight is short-lived; from August to November, the daylight returns to a steady 12 hours, providing an ideal balance for both residents and visitors. As December arrives, the cycle returns to its familiar rhythm with 12 hours of daylight, perfectly capping off a year marked by an inviting blend of light and nature—a true hallmark of life in this beautiful region.
As December unfolds in Santarém, Brazil, the winds continue their gentle embrace, with average speeds reaching 2.4 m/s (5 mph). Throughout the year, a consistent rhythm emerges, as wind speeds hover around similar velocities, ranging from 2.3 to 2.8 m/s. This pattern suggests a stable yet slightly varied breezy climate that gently transitions from month to month. Notably, September marks a subtle peak with an average of 2.8 m/s (6 mph), hinting at a brief increase in motion as the year approaches its close. In contrast, the calmness of December echoes the vibe of the preceding months, inviting a sense of tranquility and warmth that characterizes this beautiful region before the new year dawns.
Weather in Santarem varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Santarem, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, temperatures in Santarem range from a minimum of 23°C (74°F) to a maximum of 34°C (93°F), with an average of 27°C (81°F). The month is characterized by significant rainfall, totaling 359 mm (14.1 in) over 27 days, and a humidity level of 69%. In contrast, January sees slightly cooler temperatures, with a minimum of 23°C (74°F) and a maximum of 31°C (88°F), averaging 26°C (80°F). Precipitation decreases just a bit to 351 mm (13.8 in) over 24 days, but humidity rises to 79%. For more details on the weather in January, you can check Santarem weather in January.
December and February both feature warm temperatures, but with some notable differences in the weather patterns. In December, temperatures range from a minimum of 23°C (74°F) to a maximum of 34°C (93°F), with an average of 27°C (81°F). The month sees significant rainfall, totaling 359 mm (14.1 in) over 27 days, and a higher humidity of 69%. In contrast, February experiences slightly cooler temperatures, with an average of 26°C (80°F) and a maximum of 31°C (88°F). However, it has even higher precipitation at 425 mm (16.7 in) over 26 days, though the humidity dips slightly to 65%. For a closer look at February's weather, you can check Santarem weather in February.
December and March present a similar climate profile with warm temperatures, but there are some notable differences. In December, the average temperature sits at 27°C (81°F), with highs reaching up to 34°C (93°F), while March is slightly cooler, averaging 26°C (80°F) and peaking at 32°C (90°F). Precipitation is relatively high in both months, with December receiving 359 mm (14.1 in) over 27 days and March slightly higher at 399 mm (15.7 in) across 28 days. Humidity remains consistent, hovering around 69% in December and 68% in March. For a detailed look at weather patterns in March, visit Santarem weather in March.
In December, temperatures range from a minimum of 23°C (74°F) to a maximum of 34°C (93°F), with an average temperature of 27°C (81°F). The month is characterized by significant rainfall, totaling 359 mm (14.1 in), spread over 27 days, and a humidity level of 69%. In contrast, April sees slightly higher temperatures, with a minimum of 24°C (75°F) and a maximum of 31°C (89°F), while the average temperature is around 26°C (80°F). However, April experiences even more rainfall, accumulating 429 mm (16.9 in) over 29 days, with humidity increasing to 86%. For more details, you can refer to Santarem weather in April.
December and May share a similar average temperature, typically hovering around 27°C (81°F), but their weather characteristics differ significantly. In December, temperatures peak at a maximum of 34°C (93°F) and feature a lower humidity of 69%, making the heat feel more bearable. In contrast, May experiences slightly milder maximum temperatures of 31°C (88°F), yet the humidity rises to 90%, leading to a more oppressive feel. Both months see substantial rainfall, with each recording approximately 359 mm (14.1 in) of precipitation, but May has an extra day of rain, with precipitation occurring on 30 days compared to December's 27. For a detailed overview of the weather conditions during this month, you can visit Santarem weather in May.
In December, the weather is characterized by higher maximum temperatures, reaching up to 34°C (93°F), while June's temperatures peak at 32°C (90°F). Both months share the same minimum and average temperatures, sitting at 23°C (74°F) and 27°C (81°F) respectively. However, December experiences significantly more rainfall, with 359 mm (14.1 in) over 27 days, compared to June's 169 mm (6.7 in) over 25 days. Additionally, June tends to be slightly more humid, with humidity levels at 82%, compared to December's 69%. For a closer look at June's climate specifics in Santarém, visit Santarem weather in June.
The weather in December and July exhibits some notable differences, despite similar average temperatures. In December, temperatures range from a minimum of 23°C (74°F) to a maximum of 34°C (93°F), with an average of 27°C (81°F). This month is characterized by significantly higher precipitation at 359 mm (14.1 in) over 27 days, contributing to a humidity level of 69%. In contrast, July sees slightly cooler temperatures, with a maximum of 33°C (91°F) and average conditions remaining the same at 27°C (81°F). However, rainfall is notably less, totaling 137 mm (5.4 in) across just 17 days, resulting in lower humidity at 61%. For a more detailed overview of July's weather, you can visit Santarem weather in July.
December and August exhibit notable differences in weather patterns. In December, temperatures range from a minimum of 23°C (74°F) to a maximum of 34°C (93°F), with an average temperature of 27°C (81°F). This month sees significant rainfall, totaling 359 mm (14.1 in) over 27 days, contributing to a higher humidity level of 69%. In contrast, August features slightly warmer temperatures, with a minimum of 24°C (75°F) and a maximum of 34°C (94°F), averaging 28°C (83°F). However, it experiences much less precipitation at 79 mm (3.1 in) over just 9 days, resulting in lower humidity of 46%. For more details on the weather in August, you can visit Santarem weather in August.
In December, the weather tends to be warmer and wetter compared to September. The minimum temperature in December is slightly lower at 23°C (74°F), but the average temperature is higher at 27°C (81°F), compared to September's 29°C (84°F) maximum. December also experiences significantly more rainfall, with 359 mm (14.1 in) over 27 days, while September sees only 69 mm (2.7 in) over 10 days. Additionally, humidity levels are higher in December at 69%, whereas September boasts a much drier atmosphere with 40% humidity. For a closer look at the weather specifics for September, check out Santarem weather in September.
When comparing the weather in December to that of October, several notable differences emerge. December tends to be slightly cooler, with an average temperature of 27°C (81°F), compared to October's warmer average of 29°C (84°F). October also boasts higher maximum temperatures, reaching up to 35°C (95°F), while December's highest temperatures peak at 34°C (93°F). The precipitation in December is significantly higher, with 359 mm (14.1 in) occurring over 27 days, in stark contrast to October's 87 mm (3.4 in) over just 12 days. Additionally, December's humidity level is notably higher at 69%, compared to October's 38%. For a more detailed look at October's climate, you can visit Santarem weather in October.
In comparing the weather conditions of December and November, it's evident that both months feature high temperatures, with December exhibiting a slightly lower minimum temperature of 23°C (74°F) compared to November's 24°C (76°F). The average temperatures are quite similar, although December maintains a maximum of 34°C (93°F) just like November. However, December is significantly wetter, with 359 mm (14.1 in) of precipitation over 27 days, while November receives only 190 mm (7.5 in) across 20 days. Additionally, December's humidity is noticeably higher at 69%, compared to November's more moderate 39%. For a detailed look at conditions during November, check out Santarem weather in November.
December in Santarem brings a notable shift in weather, with warm temperatures and high humidity creating a tropical atmosphere. Unlike the cooler months, the average temperature escalates, often reaching up to 34°C (93°F). Additionally, December experiences one of the most significant rainfall levels of the year, with nearly 27 days of precipitation contributing to the 359 mm total. This combination of warmth and moisture distinguishes December from the drier, cooler periods, offering a lush and vibrant setting perfect for experiencing the region's rich flora and fauna. For more detailed information, visit Santarem Climate.