Last updated: January 18, 2025
Rio de Janeiro, Brazil, boasts a captivating climate characterized by its diverse Köppen-Geiger classifications, which include Aw, Cwa, Cfa, and Cfb. With an average temperature of 23°C (73°F), the city experiences a notable range throughout the year, from a crisp minimum of 5°C (40°F) in July to sweltering maximums of 41°C (106°F) in November. This dynamic weather pattern underscores Rio's tropical ambiance, enticing visitors with its vibrant atmosphere while presenting unique challenges associated with its fluctuating temperatures.
Rio de Janeiro experiences distinct seasonal temperature patterns that highlight its tropical climate. The year begins with warm summer months, where January and February showcase milder minimums around 15°C (59°F) and average highs reaching up to 40°C (104°F). As autumn approaches in March and April, temperatures gradually cool, with April marking the onset of milder averages around 23°C (74°F). The transition into winter brings even cooler temperatures, particularly in June and July, where minimums sink to as low as 5°C (40°F), yet daytime highs remain comfortable. As spring approaches, September brings a slight warming trend, culminating in warmer average temperatures and peaks around 41°C (106°F) in November, encapsulating the city's climatic diversity throughout the year.
In July, Angra dos Reis and Paraty experience similar minimum temperatures of 11°C (52°F), while Rio de Janeiro is slightly warmer at 13°C (57°F). As the seasons shift to October, the maximum temperatures rise significantly, with Rio de Janeiro reaching 37°C (99°F), followed by Angra dos Reis at 34°C (94°F), and Paraty at 33°C (92°F). For detailed monthly temperatures, you can visit monthly temperatures in Angra dos Reis, monthly temperatures in Rio de Janeiro, and monthly temperatures in Paraty.
Precipitation in Rio de Janeiro follows a distinct pattern throughout the year, with the wettest months occurring during the summer. January and February recorded significant rainfall, with 216 mm (8.5 in) in February being the peak, accompanied by an average of 18 rainy days. As summer transitions to autumn in March, precipitation remains substantial, yet it begins to decline, dropping to 179 mm (7.0 in) before reaching 85 mm (3.4 in) in April. The trend continues into the winter months, where rainfall is at its lowest, particularly in July, with only 27 mm (1.0 in) across a mere 4 days.
As the year progresses into late autumn and early winter, rainfall begins to rise again, particularly in October, when 119 mm (4.7 in) is recorded, followed by a significant increase in November with 201 mm (7.9 in) and December reaching 220 mm (8.7 in). These months see a resurgence in rainfall frequency, with an average of 18 to 20 rainy days. The oscillation between wet and dry periods is crucial in shaping the lush landscapes surrounding the city and highlights Rio's vibrant interplay between climate and the environment.
Rio de Janeiro baskes in abundant sunshine, with a clear trend of increasing daylight hours as the year progresses from winter into summer. The sunniest months peak in March, where residents and visitors enjoy a remarkable 308 hours of sunshine, closely followed by the end of the year in December with 307 hours. This vibrant summer sunshine contributes to the city's lively atmosphere, supporting outdoor activities and beach culture, making it an attractive destination.
As the seasons transition, sunshine hours gradually decrease, with the winter months of June and July yielding 276 hours and 292 hours, respectively. These months experience slightly less sunshine, yet still provide over 270 hours of daylight, ensuring that the city remains bright year-round. Notably, April and May continue to offer substantial sunshine, maintaining averages around 290 hours, while the summer months, particularly January and February, also deliver plenty of clear skies. This seasonal rhythm underscores the appeal of Rio de Janeiro's climate, inviting visitors to revel in the warmth of its sunlit days throughout the year.
The UV Index in Rio de Janeiro reveals a striking pattern of extreme sun exposure, particularly during the summer months. With values soaring to 16 in both January and February, these months present an extreme risk level for harmful UV radiation, with a recommended burn time of just 10 minutes for unprotected skin. Even as winter approaches, the UV Index remains significant; March and April still reflect high readings of 14 and 12, respectively, indicating that caution is required. This trend highlights the importance of sun protection for residents and visitors alike during peak UV times.
As the year progresses into late spring and early summer, the UV Index fluctuates but remains notable, with 9 in May and 8 in July, categorizing these months as very high. Although these readings suggest longer burn times—15 minutes—the risk of skin damage still persists. Interestingly, September sees a return to extreme levels with a UV Index of 12, while October and November continue to emphasize the need for diligent sun safety measures. This consistent elevation in UV levels underscores the significance of sun awareness in Rio de Janeiro, particularly during its sun-soaked summer months, thereby encouraging proactive protective strategies for all outdoor activities.
UV Risk Categories
Daylight duration in Rio de Janeiro showcases a fascinating annual cycle that aligns closely with the changing seasons. With an impressive 13 hours of daylight in January, the city enjoys long, sunlit days typical of summer. This abundance of daylight persists into February, sustaining nearly the same amount before gradually tapering off in the autumn months of March and April, where daylight reduces to 12 and 11 hours, respectively. As the winter months roll in, June and July see a further decline to 10 hours, marking the shortest days of the year.
As spring approaches, daylight begins to extend again, with August and September returning to 11 hours, followed by a resurgence in October at 12 hours. The year's end sees another return to the longer daylight durations of 13 hours in both November and December, providing a delightful conclusion to the year's light cycle. This dynamic interplay of daylight hours not only influences the energy and activities in Rio de Janeiro but also plays a crucial role in shaping the city's vibrant outdoor lifestyle throughout the year.
Angra dos Reis, Brazil, experiences a tropical climate characterized by warm temperatures and significant rainfall throughout the year. The warmest months are January and February, with maximum temperatures reaching up to 33°C (91°F) and 32°C (91°F) respectively, while the coolest month is July with temperatures dropping to a minimum of 11°C (52°F). Precipitation is heaviest from January to March, with January receiving about 239 mm (9.4 in) of rain. The area enjoys ample sunshine, peaking in March with 293 hours, making it a popular destination for outdoor activities. For more detailed climate information, visit Angra dos Reis climate.
Araruama, Brazil, experiences a tropical climate with warm temperatures year-round. The warmest months are January and February, with average highs around 26-33°C (79-92°F) and significant rainfall, peaking in February with 156 mm (6.1 in). The cooler months from June to August see lower temperatures, averaging between 21-22°C (70-72°F) and reduced precipitation, particularly in July with only 32 mm (1.3 in). Sunshine is abundant throughout the year, especially in December, which boasts 334 hours of sunshine. For more details, visit Araruama climate.
Armacao de Buzios, Brazil, features a tropical climate characterized by warm temperatures and distinct wet and dry seasons. Average temperatures range from 21°C (70°F) in winter months to a peak of 26°C (79°F) during the summer. January and February receive the highest rainfall, with February averaging 120 mm (4.7 in), while the dry season in July sees just 24 mm (1.0 in). Sunshine is plentiful, especially in December, which enjoys about 336 hours of sun. For more detailed information, visit Armacao de Buzios climate.
Arraial do Cabo, Brazil, enjoys a tropical climate characterized by warm temperatures year-round. January and February are the hottest months, with maximum averages reaching up to 29°C (84°F), while July and August are cooler, averaging around 21°C (71°F). The region experiences significant rainfall, particularly in March (126 mm) and November (109 mm), but enjoys ample sunshine, peaking in December with 336 hours. For more detailed climate information, visit Arraial do Cabo climate.
Cabo Frio, Brazil, experiences a warm tropical climate with average temperatures ranging from 21°C (70°F) to 28°C (83°F) throughout the year. The wettest months are March and November, receiving up to 126 mm (5.0 in) and 109 mm (4.3 in) of precipitation, respectively, while July tends to be the driest with only 27 mm (1.1 in). Sunshine is abundant, peaking in December with 336 hours of sun. This combination of warmth and precipitation supports a vibrant natural landscape. For more detailed information, visit Cabo Frio climate.
Itatiaia, Brazil, experiences a tropical highland climate characterized by warm temperatures and distinct wet and dry seasons. January and February are the wettest months, with precipitation reaching over 330 mm, while July often sees the lowest rainfall at around 33 mm. The temperature ranges from a minimum of 5°C (41°F) in July to a maximum of 34°C (93°F) in October, with average temperatures hovering between 16°C (61°F) and 23°C (73°F). With around 300 hours of sunshine in March and July, Itatiaia enjoys a fair amount of sunny days throughout the year. For more details, visit Itatiaia climate.
The climate in Mangaratiba, Brazil, features warm temperatures year-round, with January and February being the hottest months, averaging around 26°C (79°F) and reaching maximums of 34°C (93°F). Rainfall is significant during the first few months, peaking in February at 230 mm (9.1 in) before tapering off in drier months like July, which sees only 49 mm (1.9 in). Sunshine is plentiful, particularly in March, with an impressive 292 hours of sunlight. For more detailed information, you can visit Mangaratiba climate.
Niteroi, Brazil, experiences a tropical climate characterized by warm temperatures and significant humidity throughout the year. The hottest months are typically January and February, with average highs reaching 34°C (94°F) and 35°C (95°F) respectively. Rainfall peaks in March at 138 mm (5.4 in), while the driest months are June and July, with only 39 mm (1.5 in) and 35 mm (1.4 in) of precipitation. Niteroi enjoys ample sunshine, with the sunniest month being December, offering around 318 hours of sunlight. For more detailed information, visit Niteroi climate.
The climate in Nova Friburgo, Brazil is characterized by a warm temperate climate with distinct seasonal variations. Average temperatures range from a minimum of 5°C (42°F) in August to a maximum of 32°C (89°F) in January and February, while rainfall is heaviest from November to February, peaking in February with 338 mm (13.3 in). The city enjoys ample sunshine throughout the year, with March receiving the highest at 320 hours. Visitors can expect a pleasant climate with moderate rainfall, making it a favorable destination year-round. For more details, visit Nova Friburgo climate.
Paraty, Brazil, experiences a tropical climate with warm temperatures year-round, peaking in January and February, where highs reach up to 31°C (89°F). Rainfall is heaviest during the summer months, especially February, accumulating over 500 mm (20 inches), while the dry season from June to August sees significantly less precipitation. Average temperatures range from a minimum of 11°C (52°F) in July to a maximum of 33°C (92°F) in October, providing a varied but generally mild atmosphere. The area enjoys ample sunshine, particularly in March and December, with over 290 hours of sun. For more detailed information, visit Paraty climate.
Petropolis, Brazil, experiences a tropical highland climate characterized by warm temperatures and significant rainfall. The hottest months are January and February, with average highs reaching 34°C (93°F) and 35°C (94°F) respectively, while the cooler months of June and July see temperatures drop to a low of 7°C (45°F). Rainfall peaks in February, averaging 302 mm (11.9 in), while July is the driest month with only 30 mm (1.2 in) of precipitation. The city enjoys ample sunshine, particularly in March and December, when it can receive up to 310 and 312 hours of sunlight respectively. For more detailed information, visit Petropolis climate.
Rio das Ostras, Brazil, experiences a tropical climate characterized by warm temperatures year-round. January and February are the hottest months, with maximum temperatures reaching up to 36°C (97°F), while July is the coolest month, averaging around 21°C (70°F). Rainfall is most abundant from November to March, particularly in February, which sees around 190 mm (7.5 in). The region enjoys ample sunshine, peaking in December with 331 hours of sun. For more detailed information, visit Rio das Ostras climate.
Rio de Janeiro experiences a tropical climate characterized by warm temperatures and seasonal rainfall. The hottest months are January and February, with average highs around 27°C (81°F) and frequent rainfall, peaking in March with 163 mm (6.4 in). Cooler months from May to August offer milder temperatures, averaging between 21°C (70°F) and 23°C (74°F), along with reduced precipitation. The city enjoys abundant sunshine, especially in March and December, which can see up to 318 hours of sunlight. For more detailed information, visit Rio de Janeiro climate.
Saquarema, Brazil, enjoys a warm tropical climate with minimal temperature variation throughout the year. Average temperatures range from a mild 21°C (70°F) in July to a peak of 26°C (79°F) in the summer months. The region experiences its highest rainfall in March, totaling 143 mm (5.6 in), while the driest months are July and June with only 33 mm (1.3 in) and 42 mm (1.6 in) of precipitation, respectively. Sunshine is abundant, particularly in December, which boasts 334 hours of sun. For more details, see Saquarema climate.
Teresopolis, Brazil, experiences a warm, tropical climate characterized by high temperatures and significant rainfall. January and February are the hottest months, with average temperatures around 24-25°C (75-77°F) and maximums reaching up to 34°C (93°F). Rainfall is abundant, particularly in February, which sees about 311 mm (12.2 in) of precipitation. The dry season occurs from June to August, with temperatures dropping to a minimum of around 7°C (45°F). For more detailed information, visit Teresopolis climate.
Valenca, Brazil, experiences a tropical climate with temperatures ranging from a minimum of 5°C (42°F) in August to a maximum of 36°C (97°F) in October. The region sees significant rainfall, particularly in January and November, with precipitation peaking at 268 mm (10.6 in) in February. Sunshine hours are abundant throughout the year, averaging around 257 to 301 hours monthly, creating a sunny atmosphere even during the wetter months. This warm and humid environment makes Valenca an appealing destination for those looking to enjoy a tropical climate. For more details, visit Valenca climate.
Vassouras, Brazil, experiences a tropical climate with warm temperatures year-round. January and February are the hottest months, averaging around 25-24°C (78-76°F), while July tends to be the coolest, with averages dropping to 18°C (65°F). Precipitation is highest in February and December, with rainfall reaching up to 243 mm (9.6 in) and 228 mm (9.0 in), respectively. The region enjoys ample sunshine, particularly in March, which boasts 301 hours of sun. For more detailed weather insights, visit Vassouras climate.
In summary, Rio de Janeiro's climate, characterized by its diverse temperature ranges, notable precipitation patterns, abundant sunshine, and seasonal changes in daylight duration, creates a unique environment that profoundly influences both daily life and leisure activities. The city's extreme UV Index during the summer months necessitates a strong emphasis on sun protection, particularly during peak hours. As Rio transitions through its distinct seasons, residents and visitors alike can appreciate the rich interplay of natural elements that shape this vibrant urban landscape. Understanding these climatic factors not only enhances the enjoyment of Rio's outdoor attractions but also promotes greater awareness of sun safety and environmental interactions throughout the year.