Last updated: August 21, 2025
In January, Petropolis, Brazil experiences a tropical climate characterized by warm temperatures and notable humidity. Daily maximums can reach up to 34°C (93°F), with an average around 25°C (77°F), while the nights cool down to a comfortable 17°C (63°F). This month sees considerable precipitation, totaling 212 mm (8.3 in) over approximately 18 days, contributing to the lush greenery the region is renowned for. With humidity levels hovering around 85%, January in Petropolis offers a vibrant yet humid atmosphere, perfect for those who appreciate the richness of Brazilian summer weather.
In Petropolis, Brazil, January welcomes summer with a pleasant range of temperatures that set the stage for warm, vibrant days. The month typically starts with a minimum temperature of 17°C (63°F), rising to an average of 25°C (77°F), and reaching a sizzling maximum of 34°C (93°F). This trend of warm weather continues into February, where temperatures slightly increase, signaling peak summer conditions. As the month transitions into the cooler autumn months of April and May, temperatures gradually taper off, showcasing a shift towards milder averages, peaking at a comfortable average of 24°C (76°F) in March. Meanwhile, nighttime lows dip to refreshing levels, providing a welcome escape from the daytime heat. Overall, January in Petropolis is characterized by its balmy climate, making it an ideal time for outdoor exploration and enjoying the lush, mountainous landscapes.
In January, Petropolis experiences a significant amount of rainfall, with 212 mm (8.3 in) falling over the month across 18 days. This sets the tone for a wet start to the year, as precipitation levels in February peak at 302 mm (11.9 in), further stretching the number of rainy days to 20. However, by March, the precipitation returns to a more moderate 209 mm (8.2 in) with just one additional rainy day. A noticeable trend emerges as the months progress; rainfall diminishes dramatically from April onward, where only 92 mm (3.6 in) is recorded over 15 days, and this decline continues through mid-year, reaching a low of just 30 mm (1.2 in) by July. The gradual increase in precipitation resumes in October and November, culminating in a substantial 250 mm (9.9 in) in November, indicating the region's characteristic wet season. December closes the year with 288 mm (11.3 in), affirming that while January may start the year drenched, the most intense rainfall often occurs later in the cycle.
In Petropolis, Brazil, January boasts a high humidity level of 85%, mirroring February's conditions as the region experiences a humid summer. This moisture-laden air gradually begins to ease as the year progresses, with March slightly increasing to 86% before dipping to 83% in April and continuing the downward trend into the cooler months. By mid-year, July sees a notable decline to 76%, and this trend persists, hitting a low of 61% in October. As the year closes, humidity levels begin to rise again, ending December at 75%. Overall, Petropolis experiences a distinct pattern where humidity is at its peak during the warmer months, tapering off to more comfortable levels as it transitions into winter.
In January, Petropolis, Brazil experiences an extreme UV Index of 16, necessitating caution as just 10 minutes of sun exposure can lead to skin burns. This trend of extraordinarily high UV levels continues through February, with an index of 15, and remains consistent into March and April, where values hover between 13 and 11, still categorized as extreme. As the year progresses into the cooler months, the UV Index begins to decrease, hitting 8 in May, transitioning into a very high exposure category. By mid-year, from June to July, UV levels drop further, but still stay in the high range with indices of 6 and 7, allowing longer burn times of 25 minutes. However, a rise occurs again in August and September, with returns to very high and extreme categories, peaking at 12 in September. As the year winds down, the UV Index experiences another surge in the last quarter, maintaining high values that demand continued vigilance. For more detailed information, check out Petropolis UV Index.
UV Risk Categories
Petropolis, Brazil, basks in the warmth of January sunshine, enjoying a robust 270 hours of bright daylight. This exuberance continues into February, mirroring the previous month, but by March, the city revels in even more sunshine with 310 hours. As the year progresses, the sunshine gradually fluctuates, peaking in December with an impressive 312 hours. This delightful pattern suggests a generally sunny disposition throughout the year, with spring and early summer claiming the most radiant moments. The outdoor splendor of Petropolis makes it a charming destination for those seeking bright, sunlit adventures.
In Petropolis, Brazil, January offers a 30% chance of sunny weather, setting the stage for a mix of bright days and potential rain. As the year progresses, the likelihood of sunshine tends to rise, peaking in July with a notable 63%. The trend reveals that while January's sunny spells may be less frequent compared to later months, a gradual increase in brightness unfolds as summer transitions to winter, suggesting that residents and visitors alike can look forward to more sunny days in the months ahead. This yearly pattern reflects the region's distinctive climate, inviting outdoor activities as the sun shines more consistently from June onward.
In Petropolis, Brazil, January welcomes the year with a generous 13 hours of daylight, providing ample time for exploration and enjoyment of the city's stunning landscapes. As the months progress, daylight gradually decreases, with February and March each offering 12 hours. By April and May, the light softens to 11 hours, creating a cozy atmosphere as the autumn season begins. June and July see the shortest days of the year, with only 10 hours of sunlight, perfect for cozy indoor activities. However, as spring approaches in August, daylight begins to return to 11 hours, building back up to 12 hours in October. The year concludes with a return to 13 hours of daylight in both November and December, gifting residents and visitors alike a rejuvenating burst of light to finish off the year. This cyclical rhythm of daylight not only marks the changing seasons but also enhances the vibrant tapestry of life in Petropolis.
In Petropolis, Brazil, January greets visitors with an average wind speed of 1.6 m/s (4 mph), setting a gentle tone for the month. As autumn unfolds into winter, the winds remain relatively consistent, with minimal fluctuations throughout the year. Notably, August emerges as the windiest month, nudging up to an average of 1.8 m/s (4 mph), while April and May settle at the lower end of the spectrum, with winds dropping to 1.4 m/s (3 mph). As the seasons transition, January's inviting breezes pave the way for a year marked by mild and comfortable wind conditions, making Petropolis an appealing destination for outdoor enthusiasts year-round.
Weather in Petropolis varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Petropolis, focusing on differences in temperature, rainfall, humidity, and UV levels.
January and February exhibit somewhat similar weather patterns, with both months characterized by high temperatures and humidity. In January, temperatures range from a minimum of 17°C (63°F) to a maximum of 34°C (93°F), with an average of 25°C (77°F). In contrast, February sees slightly warmer conditions, with a minimum of 18°C (64°F) and a maximum of 35°C (94°F), averaging 24°C (76°F). Precipitation is notably higher in February, with 302 mm (11.9 in) over 20 days compared to January's 212 mm (8.3 in) over 18 days, maintaining a consistent humidity level of 85%. For more detailed insights, you can check out Petropolis weather in February.
In comparing the weather of January and March, we find that January features slightly warmer temperatures, with an average of 25°C (77°F) and maximums reaching up to 34°C (93°F), while March's average is marginally cooler at 24°C (76°F) with a maximum of 33°C (92°F). Both months experience significant precipitation, with January recording 212 mm (8.3 in) over 18 days, and March close behind at 209 mm (8.2 in) over 21 days. Humidity levels are quite similar, hovering around 85% in January and increasing to 86% in March. For a closer look at the specifics of March weather, you can check out this link: Petropolis weather in March.
In January, the weather is typically warmer, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F) and an average of 25°C (77°F). This month also sees significant rainfall, with around 212 mm (8.3 in) of precipitation over 18 days, contributing to a high humidity level of 85%. In contrast, April experiences cooler temperatures, with a minimum of 13°C (56°F) and a maximum of 33°C (92°F), averaging 22°C (72°F). The precipitation in April is considerably lower at 92 mm (3.6 in) over 15 days, and humidity decreases slightly to 83%. For more detailed information, you can check Petropolis weather in April.
In January, the weather is notably warm, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F), and an average temperature of 25°C (77°F). This month experiences significant rainfall, totaling 212 mm (8.3 in) over 18 days, and high humidity levels averaging 85%. In contrast, May offers a cooler climate, with temperatures spanning from a minimum of 9°C (49°F) to a maximum of 31°C (88°F) and an average of 20°C (68°F). Precipitation is much lower in May at 64 mm (2.5 in) over just 9 days, accompanied by slightly decreased humidity at 81%. For more detailed insights into May weather, you can check Petropolis weather in May.
In January, the weather is significantly warmer and more humid, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F) and an average of 25°C (77°F). This month also experiences considerable rainfall, with 212 mm (8.3 in) of precipitation over about 18 days, resulting in humidity levels around 85%. In contrast, June offers a much cooler climate, with temperatures dipping to a minimum of 10°C (50°F) and reaching a maximum of 30°C (87°F), with an average temperature of 20°C (68°F). Additionally, June sees far less rainfall, totaling only 45 mm (1.8 in) over 9 days, and slightly reduced humidity at 80%. For a detailed look at the climate during this month, check out Petropolis weather in June.
In January, the weather is characterized by warm temperatures, ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F), with an average of 25°C (77°F). This month sees considerable precipitation, totaling 212 mm (8.3 in) over 18 days, and humidity levels are high at 85%. In contrast, July experiences much cooler temperatures, with a minimum of 7°C (45°F) and a maximum of 30°C (87°F), averaging around 18°C (65°F). The rainfall is significantly lower in July, at only 30 mm (1.2 in) over just 5 days, and humidity decreases to 76%. For those interested in more about the weather conditions in this month, you can check Petropolis weather in July.
In January, the weather is significantly warmer, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F), and an average of 25°C (77°F). This month is also quite humid, with a humidity level of 85% and substantial rainfall amounting to 212 mm (8.3 in) over 18 days. In stark contrast, August experiences much cooler temperatures, with minimums dropping to 8°C (46°F) and an average of 19°C (66°F), peaking at 32°C (89°F). Precipitation in August is notably lower, with 63 mm (2.5 in) spread over just 9 days and a reduced humidity level of 73%. For more details on the weather in August, you can visit Petropolis weather in August.
In January, the weather is significantly warmer and more humid, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F) and an average of 25°C (77°F). The month also sees considerable rainfall, averaging 212 mm (8.3 in) over 18 days and a high humidity level of 85%. In contrast, September offers a cooler climate, featuring a minimum temperature of 11°C (52°F), an average of 21°C (71°F), and a maximum of 35°C (95°F). Rainfall is markedly lower, with only 67 mm (2.6 in) occurring over 10 days, and humidity drops to 68%. This combination of reduced precipitation and cooler temperatures makes September a more pleasant and drier month. For more details, visit Petropolis weather in September.
In January, the weather tends to be warmer and more humid, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F) and an average of 25°C (77°F). This month also experiences higher precipitation, with 212 mm (8.3 in) of rainfall spread over 18 days, resulting in humidity levels around 85%. Conversely, October features slightly cooler temperatures, with a minimum of 13°C (56°F), an average of 22°C (72°F), and a peak of 36°C (98°F). The month sees less rainfall at 142 mm (5.6 in), although it still has precipitation on 18 days, leading to lower humidity levels of 61%. For more detailed information, you can check out Petropolis weather in October.
When comparing the weather in January and November, January tends to be warmer with average temperatures ranging from 25°C (77°F) to a maximum of 34°C (93°F), while November sees slightly cooler averages, with temperatures ranging from 22°C (72°F) to a maximum of 35°C (95°F). Notably, January has a higher humidity level at 85%, contributing to a more oppressive feel, compared to November's relatively comfortable 72% humidity. Precipitation in January is also significant, with 212 mm (8.3 in) over 18 days, while November typically experiences 250 mm (9.9 in) across 19 days, suggesting a similarly wet climate but with slightly more rainfall in November. For a closer look at November weather trends, check out Petropolis weather in November.
When comparing January and December weather, January tends to be slightly warmer with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (93°F), while December features temperatures between 14°C (57°F) and 33°C (92°F). January also experiences higher humidity levels at 85% compared to December's 75%. Precipitation is more frequent in December, with 288 mm (11.3 in) falling over 24 days, compared to January's 212 mm (8.3 in) over 18 days. For more detailed information, you can check Petropolis weather in December.
As January unfolds in Petropolis, it brings with it a vibrant mix of warmth and humidity, distinguishing it from the milder months that precede and follow. With temperatures peaking around a steamy 34°C, the month is characterized by a lively atmosphere, ideal for outdoor activities, despite the frequent showers that contribute to 212 mm of rainfall over an average of 18 days. This higher level of humidity, around 85%, often leaves the city feeling a bit heavier, a stark contrast to the more temperate feel of other months. If you're curious about the broader climate trends in this beautiful city, visit Petropolis Climate for more insights.