Last updated: August 21, 2025
January in Rio de Janeiro, Brazil offers a vibrant and tropical climate, perfect for beach lovers and adventure seekers alike. With maximum temperatures soaring to a steamy 35°C (95°F) and an average of 27°C (81°F), the warmth invites outdoor exploration. Although January experiences about 112 mm (4.4 in) of rainfall over 13 days, the high humidity level, averaging 85%, adds a sultry feel to the air. Travelers can enjoy lively festivities and stunning landscapes while preparing for the occasional refreshing shower, making it an ideal month to experience the energetic spirit of this iconic seaside city.
In January, Rio de Janeiro basks in warm tropical temperatures, where the average hovers around 27°C (81°F), perfectly set between a minimum of 21°C (69°F) and a striking maximum of 35°C (95°F). This warmth not only invites beachgoers and revelers to the city’s famous shores but also sets the stage for the vibrant energy of summer festivities. As the month progresses, you’ll notice a slow, steady decline in daytime highs that persists into the cooler months, though temperatures remain pleasant, rarely dipping below 15°C (60°F) in May. The trend reflects a typical Brazilian summer where heat is constant, peaking as the transition to autumn begins, keeping Rio lively and engaging for locals and tourists alike, long after January sails into memory.
January marks the beginning of the year in Rio de Janeiro, bringing an average precipitation of 112 mm (4.4 in) spread over 13 days. This sets a tone of transition, as the city gears up for the wetter months ahead. Following January, February and March see significant increases in rainfall, peaking in March with 163 mm (6.4 in), before tapering off as the dry season approaches. Interestingly, while January receives a moderate amount of rain, it also experiences fewer precipitation days compared to the following months, hinting at more intense, albeit sporadic, showers. As the year progresses into April, the downpours lessen, reflecting the city's shifting climate and providing a glimpse into the vibrant, albeit rainy, summer that defines Rio.
In January, Rio de Janeiro experiences a notable humidity level of 85%, setting the tone for a sultry summer. This high moisture content continues into February, maintaining the same percentage, before slightly escalating to 86% in March. As autumn approaches, humidity begins to ease, dipping to 83% in April and further declining to 81% in May. By June, the atmosphere becomes more comfortable, with humidity falling to 80%. This trend continues through the mid-year months, reaching a low of 73% in August and 68% by September. As the year winds down, humidity begins to pick up again, reaching 72% in November and concluding at 75% in December. Overall, January marks the peak of humidity in Rio, transitioning into a gradual decrease as the year progresses, reflecting the city’s dynamic climate.
In January, Rio de Janeiro experiences a striking UV Index of 15, categorizing the exposure as extreme, which means that individuals can burn in just 10 minutes of direct sunlight. This trend of intense UV conditions continues into February (UV Index 14) and March (UV Index 13), maintaining the extreme exposure category. As the year progresses into April, the index drops to 10, marking a transition to very high levels but still necessitating vigilant sun protection with a burn time of 15 minutes. The UV Index further decreases in the following months, reflecting a pattern that shows May to July holding steady at a high exposure category of UV Index 6 to 7, where the burn time extends to 25 minutes. As spring turns into summer, UV levels rebound in August and September, highlighting another extreme phase before moderating slightly in October and November, which still require caution with burn times of 10 minutes. This cyclical pattern underscores Rio's exceptional sun intensity year-round. For more detailed information, check out the Rio de Janeiro UV Index.
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In Rio de Janeiro, January heralds the summer with an impressive 270 hours of sunshine, setting the stage for vibrant beach days and lively festivities. As the month unfolds into February, the sun shines even brighter, offering 271 hours to bask in the warmth. The sunshine peaks in March at 309 hours, perfect for outdoor adventures and Carnival celebrations. Following the summer peak, April sees a slight decline to 296 hours, yet the days remain sun-kissed. A gentle dip continues into May with 282 hours, before June's 276 hours keep the city's spirit aglow. As winter approaches, July and August maintain pleasant conditions with 290 and 275 hours, respectively. The trend towards sunnier days resumes in September at 293 hours, while October and November offer a cozy 281 and 284 hours of light. The year culminates in December with a remarkable 318 hours, wrapping up with a radiant finale that beckons both locals and visitors to enjoy everything Rio has to offer.
In Rio de Janeiro, January offers a 33% chance of sunny weather, a figure that remains steady into February. However, as summer transitions into autumn, the likelihood of sunshine starts to climb, peaking at 60% in August. This pattern suggests that while January isn't particularly sunny, the following months bring increased brightness, particularly in mid-year. By April and June, the odds of clear skies increase to 54%, creating a vibrant atmosphere for outdoor activities. In contrast, the cloudier months of October and November see a drop in sunshine probabilities, with just 18% chance in October, underscoring the seasonal variability that defines Rio's climate.
In January, Rio de Janeiro basks in an impressive 13 hours of daylight, making it one of the sunniest months of the year. This abundance of light begins to taper off in February and March, where the sunshine recedes to 12 hours. As the year progresses into April, daylight decreases to 11 hours, and by May, it settles at 10 hours, marking the transition into the cooler months. Interestingly, from June through July, Rio maintains this 10-hour daylight duration, reflecting a stable pattern amid winter's grip. However, as spring approaches in August and September, daylight increases again to 11 hours, followed by a gradual climb back to 12 hours in October. Both November and December wrap up the year with a delightful return to 13 hours of daylight, giving residents and visitors plenty of time to enjoy the vibrant city beneath the warm Brazilian sun.
In January, Rio de Janeiro enjoys a gentle breeze with an average wind speed of 2.9 m/s (6 mph), offering a refreshing contrast to the warm summer sun. As the season progresses into February, the winds calm slightly, decreasing to 2.1 m/s (5 mph), providing a serene atmosphere perfect for beach outings. This tranquility continues through March but picks up again in April, reaching 3.3 m/s (7 mph) as autumn arrives. The wind speeds fluctuate through the year, with a notable peak in October at 3.9 m/s (9 mph), before tapering off again in the early months of the new year. Overall, Rio's winds create a dynamic and inviting environment, perfect for both relaxation and outdoor activities.
Weather in Rio de Janeiro varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Rio de Janeiro, focusing on differences in temperature, rainfall, humidity, and UV levels.
In January, temperatures in Rio de Janeiro range from a minimum of 21°C (69°F) to a maximum of 35°C (95°F), with an average of 27°C (81°F). The month experiences 112 mm (4.4 in) of rain over 13 days and maintains a high humidity level of 85%. In contrast, February sees similar temperature patterns, with the same minimum and maximum temperatures, but a slight decrease in average temperature to 27°C (80°F). However, February is wetter, accumulating 146 mm (5.7 in) of precipitation over 17 days, while the humidity remains constant at 85%. For more details on February weather in Rio, you can check Rio de Janeiro weather in February.
When comparing the weather in January and March, there are some notable similarities and differences. January sees slightly higher average temperatures, with a minimum of 21°C and a maximum of 35°C, while March has a similar minimum of 20°C and a slightly lower average of 26°C. However, March experiences increased precipitation, totaling 163 mm over 17 days compared to January's 112 mm over 13 days. Humidity levels remain relatively constant, with January at 85% and March slightly higher at 86%. For more detailed information, you can check the weather specifics here: Rio de Janeiro weather in March.
In January, the weather is typically warmer, with average temperatures ranging from a minimum of 21°C (69°F) to a maximum of 35°C (95°F), accompanied by significant rainfall of 112 mm (4.4 in) over 13 days and high humidity at 85%. In contrast, April experiences slightly cooler temperatures, with averages ranging from a minimum of 18°C (65°F) to a maximum of 34°C (94°F). Precipitation during this month drops to 95 mm (3.7 in), while the number of rainy days remains the same at 13, and the humidity is marginally lower at 83%. For more details on April's climate, you can visit Rio de Janeiro weather in April.
In January, the weather in Rio de Janeiro is characterized by higher temperatures, with minimums around 21°C (69°F) and averages reaching 27°C (81°F), peaking at a maximum of 35°C (95°F). The month experiences significant precipitation, totaling 112 mm (4.4 in) over about 13 days, accompanied by high humidity levels of 85%. In contrast, May offers a milder climate, with temperatures dipping to a minimum of 15°C (60°F) and an average of 23°C (73°F), while maximums reach 33°C (91°F). The rainfall in May is lighter, with 77 mm (3.1 in) recorded over 10 days, and the humidity is slightly lower at 81%. For a more detailed analysis, you can check Rio de Janeiro weather in May.
In January, the weather in Rio de Janeiro is hot and humid, with temperatures ranging from a minimum of 21°C (69°F) to a maximum of 35°C (95°F) and an average of 27°C (81°F). The month also sees significant precipitation, averaging 112 mm (4.4 in) over 13 days, contributing to the high humidity of 85%. In contrast, June experiences milder conditions, with temperatures dipping to a minimum of 16°C (61°F) and peaking at 32°C (89°F), resulting in an average of 22°C (72°F). Rainfall is less frequent in June, totaling 44 mm (1.7 in) over just 9 days and accompanied by a slightly lower humidity of 80%. For more details, check out Rio de Janeiro weather in June.
When comparing the weather in January and July, significant differences become evident. January boasts warmer temperatures with a minimum of 21°C (69°F) and an average of 27°C (81°F), reaching up to a maximum of 35°C (95°F). The month experiences considerable rainfall, accumulating 112 mm (4.4 inches) over 13 days, and the humidity is notably high at 85%. In contrast, July's weather is cooler with a minimum temperature of 13°C (57°F) and an average of 21°C (70°F), peaking at 32°C (91°F). Rainfall in July is substantially lower, measuring only 38 mm (1.5 inches) over about 7 days, coupled with a drop in humidity to 76%. For more detailed insights, visit Rio de Janeiro weather in July.
In January, the weather in Rio de Janeiro is characterized by warm temperatures, with a minimum of 21°C (69°F), an average of 27°C (81°F), and maximum highs reaching up to 35°C (95°F). This month also sees considerable rainfall, with 112 mm (4.4 in) of precipitation spread over 13 days, and high humidity levels at 85%. In contrast, August brings cooler conditions, with temperatures ranging from a minimum of 14°C (57°F) to an average of 21°C (70°F) and a maximum of 33°C (91°F). Precipitation decreases to 75 mm (3.0 in) over 11 days, accompanied by lower humidity at 73%. For more detailed information, you can visit Rio de Janeiro weather in August.
In comparison, January in Rio de Janeiro experiences warmer temperatures, with minimums around 21°C (69°F) and average highs reaching 35°C (95°F), accompanied by high humidity levels of 85%. The month also sees significant rainfall, with about 112 mm (4.4 in) of precipitation over 13 days. In contrast, September offers a more temperate climate, with minimum temperatures dropping to 16°C (60°F) and average highs similar at 35°C (96°F). The humidity decreases to 68%, and the precipitation is notably lighter, at 55 mm (2.2 in) over 8 days. For more details, check the Rio de Janeiro weather in September.
In January, the weather in Rio de Janeiro is characterized by warm temperatures, with a minimum of 21°C (69°F) and an average of 27°C (81°F), peaking at 35°C (95°F). This month also experiences significant rainfall, with 112 mm (4.4 in) spread over 13 days and high humidity levels reaching 85%. In contrast, October offers a more moderate climate, featuring a lower minimum temperature of 17°C (63°F) and an average of 24°C (75°F), while maximum temperatures can soar to 37°C (99°F). Although October sees a bit less rainfall at 98 mm (3.8 in) over 15 days, the humidity is considerably lower at 61%. For more details on the October weather in Rio de Janeiro, you can visit Rio de Janeiro weather in October.
In comparing the weather of January and November, January tends to be warmer overall, with average temperatures ranging from a minimum of 21°C (69°F) to a maximum of 35°C (95°F). In contrast, November has slightly cooler averages, featuring a minimum of 17°C (64°F) and an average that peaks at 35°C (94°F). Rainfall is also notable between the two months; January experiences 112 mm (4.4 in) of precipitation over 13 days, while November sees slightly more, with 135 mm (5.3 in) over 17 days. Additionally, humidity levels are higher in January at 85%, compared to November's 72%. For a deeper dive into November's climate, you can check out Rio de Janeiro weather in November.
January weather in Rio de Janeiro is typically warmer than December, showcasing minimum temperatures of 21°C (69°F) and maximum temperatures reaching up to 35°C (95°F). In contrast, December has slightly cooler temperatures, with a minimum of 18°C (65°F) and a maximum of 34°C (93°F). Additionally, January experiences higher humidity levels at 85% and a total precipitation of 112 mm (4.4 in) over 13 days, while December, with 75% humidity, sees more rainfall at 143 mm (5.6 in) over 17 days. For more details on December weather, check out Rio de Janeiro weather in December.
January in Rio de Janeiro is characterized by warm temperatures and high humidity, making it one of the hottest months of the year. With an average temperature of around 27°C (81°F), visitors can expect leisurely beach days and vibrant outdoor activities. However, January also brings a fair amount of rainfall, with approximately 13 days experiencing precipitation throughout the month. This combination of heat and humidity sets January apart from the milder, drier months, giving it a unique tropical flair. For more insights into what to expect from Rio's climate, check out Rio de Janeiro Climate.