Last updated: January 18, 2025
Rondônia, Brazil, is characterized by its distinct Köppen-Geiger climate classes of Aw and Am, indicative of a tropical savanna climate with a pronounced wet season. The region experiences temperatures that range from a minimum of 8°C (47°F) in July to a maximum of 39°C (103°F) in November, with an average temperature hovering around 26°C (79°F). This climatic variability plays a significant role in shaping the local ecosystem and the agricultural practices of the region, offering insights into the intricate interactions between weather patterns and environmental conditions.
The temperature patterns in Rondônia, Brazil, reveal distinct seasonal trends characterized by relatively mild conditions at the beginning of the year, gradually transitioning to hotter months. January and February maintain a pleasant climate with minimum temperatures around 19°C (66-67°F) and maximums peaking at 34-35°C (94-96°F). As the year progresses into the cooler months of April and May, minimum temperatures dip to 16°C (61°F) and 10°C (51°F), but maximum temperatures remain consistently high at around 35°C (95°F). The heart of winter in July sees the lowest recorded temperatures, dropping to 8°C (47°F), before rising again in August, where maximums reach upward of 38°C (101°F). The late spring months of September through November bring the highest average temperatures, with maximums escalating to 39°C (102-103°F), immersing the region in a warm tropical climate, before tapering off slightly in December. This cyclical temperature pattern reflects the dynamic interplay of seasonal changes in Rondônia's unique environment.
Cacoal experiences a minimum temperature of 10°C (51°F) in July and reaches a maximum of 38°C (100°F) in September, as detailed in the monthly temperatures in Cacoal. Ji Parana records a slightly higher minimum of 11°C (52°F) in July, with a peak of 38°C (101°F) in September, according to the monthly temperatures in Ji Parana. Porto Velho has a minimum of 14°C (57°F) in August and a maximum of 37°C (100°F) in September, as noted in the monthly temperatures in Porto Velho.
Rondônia, Brazil, experiences a pronounced seasonal variation in precipitation, primarily driven by its tropical climate. The wettest months are February and December, receiving 303 mm (11.9 in) and 299 mm (11.8 in) respectively, combining for nearly 50% of the annual rainfall. Rainfall distribution peaks during the early and late portions of the year, with significantly higher amounts recorded between January and March, averaging around 226 mm (8.9 in) and diminishing to 180 mm (7.1 in) in April. As the dry season approaches, May experiences a sharp decline to 76 mm (3.0 in), followed by minimal rainfall in June and July, where it drops dramatically to just 2 mm (0.1 in).
Although the dry months exhibit significantly lower rainfall, precipitation begins to rise again in late winter, with October bringing 133 mm (5.2 in). Notably, the duration of rainy days also correlates with the precipitation levels; February sees 26 wet days, peaking further in March with 27 days before rapidly decreasing in May to just 12 days of rain. The transition from the wet season to the dry season and back again exemplifies the region's distinct climatic rhythm, highlighting the importance of seasonal rainfall for the local ecology and agriculture.
In Rondônia, Brazil, sunshine duration exhibits remarkable seasonal trends, peaking during the dry months of mid-year. From January through March, the region experiences an increase in sunlight hours, ranging from 205 hours to 250 hours. However, it is April that marks a significant turning point as the sunshine hours climb further to 259 hours, suggesting a transition toward the sunnier peak season. This upward trend continues into the winter months, where July stands out with 336 hours of glorious sunshine, solidifying it as the sunniest month of the year. These extended daylight hours contribute to the vibrant atmosphere and support various ecological and agricultural activities.
As the dry season wanes, sunshine hours gradually decrease, with August and September still enjoying ample sunlight but at slightly reduced levels of 318 hours and 301 hours respectively. By the time December arrives, sunshine duration drops to 236 hours, indicating a return to the more overcast conditions associated with the wet season. Collectively, this pattern illustrates how Rondônia's climate fluctuates, with substantial sunlight concentrated around the dry season, fostering a thriving environment well-suited for both locals and biodiversity alike.
In Rondônia, Brazil, the UV Index consistently indicates a high risk of harm from unprotected sun exposure, particularly from January to March when it reaches a peak of 16, categorized as extreme. During these months, the burn time is a mere 10 minutes, highlighting the urgent need for protective measures such as sunscreen and appropriate clothing. April sees a slight decrease to a UV Index of 15, but the risk remains considerable. Notably, May marks a reduction in the index to 12, still reflecting harsh conditions but offering a brief reprieve before the gradual decline in UV levels during the following months.
As the dry season progresses into June and July, the UV Index drops to 10, categorized as very high, allowing for a marginally increased burn time of 15 minutes. However, as summer transitions into late winter, the UV Index climbs again through August and September, reaching 12 and 13 respectively, before spiking back to 15 in October. December and November replicate the extreme conditions seen at the year's beginning with UV Index values of 16, reinforcing the need for vigilance against sun exposure throughout the year. Given these conditions, individuals in Rondônia should remain aware of the UV risks year-round, emphasizing sun safety practices to mitigate potential skin damage.
UV Risk Categories
In Rondônia, Brazil, the duration of daylight remains relatively stable throughout the year, reflecting the region's proximity to the equator. From January to March, residents enjoy an average of 12 hours of daylight each day, promoting a vibrant outdoor lifestyle and supporting agriculture. This consistent daylight offers a natural rhythm for both the local community and diverse wildlife, fostering an environment where natural activities can flourish.
As the year progresses into the months of April through August, daylight hours decrease slightly to 11 hours per day. This minor reduction does not significantly impact daily life; however, the return to 12 hours of daylight resumes in September and remains stable through December. This cyclical pattern exemplifies the region's unique climatic consistency, allowing for predictability in both environmental conditions and human activities, while also enhancing the natural beauty of Rondônia throughout the changing seasons.
Ariquemes, Brazil, experiences a tropical climate characterized by warm temperatures and distinct wet and dry seasons. Average temperatures range from a minimum of 12°C (54°F) in July to a maximum of 38°C (101°F) in August. The region sees significant rainfall primarily between January and April, with February being the wettest month at 300 mm (11.8 in), while July is notably dry with only 2 mm (0.1 in). Sunshine hours peak in July, with an impressive 337 hours, making it the sunniest month. For more details, visit Ariquemes climate.
Cacoal, Brazil experiences a tropical climate characterized by warm temperatures and distinct wet and dry seasons. From January to March, temperatures range from a minimum of 21°C (70°F) to a maximum of 34°C (93°F), accompanied by heavy rainfall, particularly in February with 330 mm (13.0 in). The dry months from June to July see cooler temperatures, dropping to as low as 10°C (51°F) with minimal precipitation, just 1 mm (0.0 in) in July. Sunshine is abundant, peaking at 338 hours in July, offering long days despite the variation in rainfall. For more detailed information, visit Cacoal climate.
Extrema, Brazil experiences a tropical climate characterized by warm temperatures and significant rainfall. January and February are the wettest months, receiving 268 mm and 287 mm of precipitation respectively, while July remains the driest with only 8 mm. Temperature ranges from a minimum of 11°C (53°F) in July to a maximum of 38°C (101°F) in August and September. The region enjoys abundant sunshine, peaking at 332 hours in July. For more detailed information, visit Extrema climate.
Guajara Mirim, Brazil, experiences a tropical climate characterized by high temperatures and significant rainfall throughout the year. Average temperatures range from a low of 11°C (52°F) in July to a high of 38°C (100°F) in August and October, with a consistent average around 26°C (79°F). The region sees its heaviest precipitation in December (367 mm) and February (292 mm), while July records minimal rain (6 mm). Ample sunshine is prevalent, with July boasting the most sun hours at 333, making it an attractive destination for those who enjoy warm weather. For more details, visit Guajara Mirim climate.
Jaru, Brazil, experiences a tropical climate characterized by high temperatures year-round, with averages ranging from 25°C (78°F) to 28°C (82°F). The hottest months are typically July and August, with maximum temperatures reaching up to 38°C (100°F). Rainfall is significant, especially from January to March, where monthly precipitation can exceed 200 mm (7.9 in). The region also enjoys ample sunshine, with July receiving the highest hours at approximately 337. For more detailed information, visit Jaru climate.
Ji Parana, Brazil, experiences a tropical climate characterized by warm temperatures and distinct wet and dry seasons. Temperature averages range from a minimum of 11°C (52°F) in July to a maximum of 38°C (101°F) in September, while rainfall peaks in February with 298 mm (11.7 in) and significantly decreases in the dry months of July and August. Sunshine is abundant, especially in June (314 hours) and July (337 hours), providing ample light throughout the year. Overall, the climate offers both heat and humidity, making it a region with diverse weather patterns. For more details, visit Ji Parana climate.
Ouro Preto do Oeste, Brazil, experiences a tropical climate with warm temperatures year-round, averaging between 25°C (78°F) and 27°C (81°F). The hottest months are typically from August to October, where maximum temperatures can reach up to 38°C (100°F). Precipitation is highest in February, with 300 mm (11.8 in), while the driest months are July and June, receiving only 2 mm (0.1 in) and 12 mm (0.5 in), respectively. Sunshine is abundant, especially in the dry season, with July receiving up to 337 hours of sunlight. For a detailed overview, visit Ouro Preto do Oeste climate.
The climate in Pimenta Bueno, Brazil, is characterized by warm temperatures year-round, with average highs ranging from 25°C (78°F) in the cooler months to 38°C (101°F) in September. The region experiences significant rainfall, particularly from January to March, with February receiving the highest precipitation at 304 mm (12.0 in). Sunshine is abundant, peaking in July with 340 hours, while the rainy season sees the least sun. The overall weather pattern offers lush greenery and a vibrant atmosphere. For more details, visit Pimenta Bueno climate.
Porto Velho, Brazil, experiences a tropical climate characterized by high temperatures and significant rainfall throughout the year. With average temperatures ranging from 26°C (79°F) to 28°C (83°F), the hottest months are typically from July to September, where maximum temperatures can reach up to 37°C (99°F). Rainfall peaks from January to March and again in November and December, with January being the wettest month at 268 mm (10.5 inches). Despite the heavy rains, sunshine is abundant, especially from May to July, where residents can enjoy over 300 hours of sunlight. For more details, visit Porto Velho climate.
Posto Fiscal Rolim de Moura, Brazil, experiences a tropical climate characterized by high temperatures year-round. From January to March, the average temperatures hover around 26°C (79°F), peaking at 35°C (94°F) in February. The wet season, peaking in January and February with over 200 mm of rainfall, contrasts sharply with the dry months of June and July, which see minimal precipitation. Sunshine is abundant, with July enjoying around 334 hours, making it one of the sunniest months. For more details, visit Posto Fiscal Rolim de Moura climate.
Presidente Medici, Brazil, experiences a tropical climate characterized by warm temperatures year-round. January and February are among the hottest months, with temperatures reaching up to 34°C (93°F), while July can peak at 36°C (96°F). The region sees substantial rainfall, especially from January to March, with February recording the highest precipitation at 296 mm (11.7 in). Sunshine hours are plentiful, particularly in the winter months, with July enjoying up to 338 hours of sunlight. For more information, visit Presidente Medici climate.
Vilhena, Brazil experiences a tropical climate characterized by warm temperatures and significant seasonal rainfall. January and February are among the wettest months, with precipitation reaching up to 299 mm, while July sees the least rain, often just 1 mm. Temperatures generally range from a minimum of 8°C (47°F) in July to a maximum of 37°C (98°F) in September. The region enjoys ample sunshine, particularly in the middle of the year, with July boasting up to 338 hours of sunshine. For more detailed information, visit Vilhena climate.
In conclusion, Rondônia, Brazil, showcases a climate characterized by distinct seasonal variations in temperature, precipitation, sunshine duration, UV Index, and daylight hours. The tropical savanna climate fosters warm temperatures throughout the year, with marked wet and dry seasons that influence the local ecosystem and agricultural practices. Additionally, the high UV Index and significant sunshine hours highlight the need for sun protection, particularly during the extreme months. As daylight duration remains relatively consistent, residents and visitors can rely on a predictable rhythm of both climate and environment, reinforcing the importance of adapting to seasonal changes for sustainable living and conservation in this diverse and vibrant region.