Last updated: August 21, 2025
January in Rio das Ostras, Brazil is characterized by a warm tropical climate, with maximum temperatures soaring to 36°C (97°F) and an average hovering around 27°C (81°F). The minimum temperature rarely dips below 20°C (68°F), providing pleasant evenings. However, this lively month also brings about significant moisture, resulting in 127 mm (5.0 in) of rain over approximately 12 days, contributing to a high humidity level of 85%. Despite the occasional showers, the inviting warmth and vibrant atmosphere make January an exciting time to experience the beauty of Rio das Ostras.
In January, Rio das Ostras, Brazil, basks in warm tropical bliss, with temperatures ranging from a mild 20°C (68°F) at night to a sizzling 36°C (97°F) during the day. The average temperature settles comfortably at 27°C (81°F), inviting beachgoers and sun-seekers to enjoy both the vibrant coastal culture and natural beauty. As the month transitions into February, the temperatures remain relatively stable, maintaining a warm nighttime low of 20°C (68°F) and peaking again at 36°C (97°F). This consistent warmth continues into March, with slightly lower averages heralding the arrival of autumn. Noteworthy is the gradual decline in maximum temperatures as the year progresses, hinting at the seasonal shift; by July, the highs dip to around 33°C (91°F), while the mornings feel refreshingly cooler. Overall, January marks the height of summer, showcasing Rio das Ostras as a sun-drenched paradise that invites exploration and relaxation alike.
In January, Rio das Ostras experiences an average precipitation of 127 mm (5.0 in) over 12 days, marking a refreshing start to the year. This month typically sees a moderate mix of sunny spells and rain, setting the stage for the wetter months ahead. By February, the rainfall escalates significantly to 190 mm (7.5 in) across 20 days, highlighting a trend of increasing precipitation as summer fully arrives. As March follows, the rainfall slightly decreases to 185 mm (7.3 in) but remains substantial, indicating a characteristic wet season in this coastal region. The pattern continues with a sharp reduction in April and May, showcasing much drier conditions, while the months of November and December culminate the year with peak rainfall amounts of 235 mm and 233 mm, respectively, solidifying their status as the rainiest months. Overall, January acts as a transitional phase in the precipitation cycle, where the humidity begins to ramp up, foreshadowing the lush, vibrant conditions typical of Rio das Ostras during the height of summer.
In Rio das Ostras, Brazil, January welcomes visitors with a high humidity level of 85%, setting the tone for a warm, tropical atmosphere. This trend continues slightly upward into February, where humidity peaks at 86%, before gradually declining through the months. By April, it settles at 82%, and stabilizes around the 80% mark from May to July. As winter settles in, humidity dips to its lowest at 75% in August and September, providing a refreshing respite. However, humidity starts to rise again in the subsequent months, ending the year at a comfortable 81% in December. Overall, the humidity levels in Rio das Ostras showcase a distinct seasonal ebb and flow, enhancing the city's allure throughout the year.
In January, Rio das Ostras experiences an exceptionally high UV Index of 16, classified as extreme, indicating that just 10 minutes of sun exposure can lead to sunburn. This level of intensity continues into February, albeit slightly lower at 15, preserving the extreme category and the same critical burn time. As the year unfolds, while the UV Index gradually decreases in March and April to 13 and 11 respectively, both months still require caution with a 10-minute burn time. By May, the situation shifts slightly to a very high index of 8, allowing for a more manageable 15-minute exposure before burning occurs. However, as winter approaches, the index stabilizes at lower levels, with June and July maintaining a high category with UV Indexes of 6 and 7, granting 25-minute burn times. Interestingly, the UV intensity rebounds in August back to a very high level of 9. The cycle continues into the latter months, with September to November marking a return to extreme categories, peaking again at 14 in November before rising back to 16 in December. This consistent pattern underscores the necessity for vigilance all year round, particularly during these months of high UV activity. For detailed insights on how to stay safe under the sun, check out the Rio das Ostras UV Index.
UV Risk Categories
January in Rio das Ostras welcomes abundant sunshine, offering an impressive 286 hours of bright daylight. As the summer season unfolds, the sun continues to shine brightly, with February following closely behind at 280 hours. March then bursts onto the scene with the highest monthly total of 322 hours, marking a peak in sunshine before the days gradually shorten. April and May maintain a healthy glow with 302 and 289 hours respectively, while June and July see a slight dip, recording 285 and 297 hours. As winter transitions to spring, the trend shifts back toward brightness in the latter half of the year, with September reaching 306 hours and December closing out the year strongly with 331 hours. Overall, Rio das Ostras enjoys a vibrant sunshine pattern, providing ample opportunity for beach lovers and sun-seekers alike all year round.
In Rio das Ostras, Brazil, January boasts a 42% chance of sunny weather, making it a moderately bright start to the year. As you move into February, the likelihood of sunshine dips slightly to 30%. However, the months following January reveal a notable upward trend; by March, the chance increases to 48%, and it continues to rise through April, reaching 55%. This pattern continues, peaking in July with a striking 66% chance of sunshine. As winter gives way to spring and summer, not only does the probability of sunny days increase, but the vibrant atmosphere of Rio das Ostras brightens up too. If you're looking to soak up the sun, late summer and early fall are particularly promising, while December and October present lower chances, hinting at a seasonal shift.
In Rio das Ostras, Brazil, January shines brightly with an impressive 13 hours of daylight, inviting both locals and visitors to embrace the warmth of summer’s peak. As the months progress into February and March, daylight remains steady at 12 hours, offering plenty of time for outdoor activities. However, April marks the beginning of a gradual decline, with daylight dipping to 11 hours in both April and May. This reduction continues into the cooler months of June and July, where the days shorten to just 10 hours. The trend shifts slightly in August and September, as daylight increases again to 11 hours, heralding a gradual return to longer days. By October, daylight returns to 12 hours, and the year concludes with the sun casting its rays for 13 hours again in November and December, completing a beautiful cycle of light and dark across the year.
In January, Rio das Ostras experiences a pleasant breeze with an average wind speed of 3.7 m/s (8 mph), marking one of the year's windiest months. This invigorating wind sets the tone for a vibrant start to the year, with conditions slightly tapering in February and March, where winds drop to a gentle 2.4 m/s (5 mph). As the months progress, the wind picks up again in April and August, reaching 2.9 m/s (6 mph) and 3.4 m/s (8 mph) respectively, before stabilizing at around the same moderate speeds through the latter part of the year. Interestingly, October and November see a slight increase to 3.3 m/s (7 mph) and 2.9 m/s (7 mph), suggesting a subtle resurgence of the coastal breezes as the year winds down. Overall, while January boasts the strongest winds, the general trend indicates a dynamic coastal environment that varies steadily throughout the year, inviting both locals and visitors to embrace the coastal charm of Rio das Ostras.
Weather in Rio das Ostras varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Rio das Ostras, focusing on differences in temperature, rainfall, humidity, and UV levels.
In January, the weather in Rio das Ostras typically sees a minimum temperature of 20°C (68°F) and an average of 27°C (81°F), with maximum temperatures reaching up to 36°C (97°F). It experiences substantial rainfall, totaling 127 mm (5.0 in) across about 12 days, accompanied by high humidity levels averaging around 85%.
February, on the other hand, features a slightly cooler average temperature of 26°C (79°F), while still maintaining a minimum of 20°C (68°F) and the same maximum of 36°C (97°F). Notably, February is wetter, with precipitation increasing to 190 mm (7.5 in) over approximately 20 days and humidity slightly rising to an average of 86%. For more detailed information, you can check Rio das Ostras weather in February.
In comparing the weather of January and March, both months feature warm temperatures, but March tends to be slightly cooler with an average temperature of 26°C (79°F) compared to January's 27°C (81°F). January experiences higher maximum temperatures at 36°C (97°F), whereas March peaks at 35°C (96°F). Additionally, March sees increased rainfall, totaling 185 mm (7.3 in) over 17 days, compared to January's 127 mm (5.0 in) over 12 days. Humidity levels remain similar, with January at 85% and March slightly lower at 84%. For more detailed weather insights, you can check out Rio das Ostras weather in March.
In January, the weather is characterized by warmer temperatures, with a minimum of 20°C (68°F), an average of 27°C (81°F), and a maximum reaching up to 36°C (97°F). This month also sees significant rainfall, with a total precipitation of 127 mm (5.0 in) over 12 days, accompanied by high humidity levels averaging around 85%.
In contrast, April offers slightly cooler temperatures, featuring a minimum of 16°C (62°F), an average of 24°C (76°F), and a maximum of 35°C (96°F). Rainfall decreases significantly to 73 mm (2.9 in) over the same number of days, and the humidity is marginally lower at 82%. For more detailed information, you can check Rio das Ostras weather in April.
In January, Rio das Ostras experiences significantly warmer weather, with average temperatures ranging from a comfortable 27°C (81°F) to a scorching 36°C (97°F). The month also sees higher humidity at 85% and substantial precipitation of 127 mm (5.0 in) over approximately 12 days. In contrast, May offers milder conditions, with average temperatures between 13°C (56°F) and 34°C (93°F), and a reduction in rainfall to 68 mm (2.7 in) over just 9 days. Humidity decreases slightly to 80%, making May a more pleasant month overall. For more details, check out Rio das Ostras weather in May.
In January, the weather in Rio das Ostras is characterized by much warmer temperatures, with a minimum of 20°C (68°F) and an average of 27°C (81°F), peaking at a sizzling 36°C (97°F). This month also sees significant precipitation, averaging 127 mm (5.0 in) over 12 days, coupled with high humidity levels of 85%. In contrast, June experiences cooler temperatures, with a minimum of 13°C (56°F) and an average of 22°C (72°F), reaching a maximum of 33°C (91°F). Rainfall is considerably less in June, totaling 34 mm (1.3 in) over just 7 days, and the humidity is slightly lower at 78%. For more details on the weather in June, you can visit Rio das Ostras weather in June.
January and July present a striking contrast in weather conditions. January, with its high temperatures ranging from a minimum of 20°C (68°F) to a maximum of 36°C (97°F) and an average of 27°C (81°F), is characterized by significant humidity at 85%. The month also experiences considerable precipitation, with 127 mm (5.0 in) falling over 12 days. In stark contrast, July features much cooler temperatures, with a minimum of 12°C (53°F), an average of 21°C (70°F), and a maximum of 33°C (91°F). Additionally, July is notably drier, receiving only 19 mm (0.7 in) of rainfall across 5 days and a lower humidity level of 77%. For more detailed insights, check Rio das Ostras weather in July.
In January, Rio das Ostras experiences warm and humid weather, with temperatures ranging from a minimum of 20°C (68°F) to a maximum of 36°C (97°F) and an average of 27°C (81°F). The month sees significant rainfall, with 127 mm (5.0 in) of precipitation over approximately 12 days, accompanied by high humidity levels averaging 85%. In contrast, August offers a cooler and drier climate, with temperatures ranging from a minimum of 13°C (55°F) to a maximum of 34°C (93°F), and an average temperature of 21°C (70°F). Precipitation decreases to 53 mm (2.1 in) over 10 days, and humidity also drops to 75%. For more detailed insights, you can check out Rio das Ostras weather in August.
In January, Rio das Ostras experiences warmer weather with temperatures ranging from a minimum of 20°C (68°F) to a maximum of 36°C (97°F) and an average of 27°C (81°F). The month is characterized by higher humidity at 85% and significant precipitation of 127 mm (5.0 in) over 12 days. In contrast, September offers a milder climate, with temperatures ranging from 15°C (59°F) to 35°C (96°F), averaging around 23°C (74°F). This month sees less rainfall, totaling 66 mm (2.6 in) over just 8 days, and lower humidity at 75%. For more detailed information on the weather in September, you can visit Rio das Ostras weather in September.
In January, the weather in Rio das Ostras is characterized by warmer temperatures, with a minimum of 20°C (68°F) and an average high of 36°C (97°F). The month sees significant humidity at 85% and experiences about 127 mm (5.0 in) of precipitation over 12 days. In contrast, October offers a slightly cooler climate, featuring a minimum temperature of 16°C (61°F) and an average high of 36°C (98°F). Precipitation is slightly lower in October at 117 mm (4.6 in), but it occurs over a greater number of days, totaling 15 days. The humidity also decreases to a more comfortable 74%. For a detailed look at the monthly conditions, check out Rio das Ostras weather in October.
In comparing the weather between January and November, January tends to be slightly warmer, with average temperatures ranging from a minimum of 20°C (68°F) to a maximum of 36°C (97°F). In contrast, November presents milder conditions, featuring an average temperature of 24°C (75°F) and a minimum of 15°C (60°F). Additionally, November sees significantly more rainfall, with 235 mm (9.3 in) over 18 days, compared to January's 127 mm (5.0 in) across 12 days. Despite the heavier precipitation in November, the humidity levels are slightly lower at 79%, compared to January's 85%. For more detailed insights on November weather, visit Rio das Ostras weather in November.
In comparing the weather of January and December, we see notable variations in temperature and precipitation. January typically experiences higher temperatures with a minimum of 20°C (68°F) and an average of 27°C (81°F), reaching a maximum of 36°C (97°F). In contrast, December has slightly cooler temperatures, with a minimum of 16°C (61°F), an average of 25°C (78°F), and a maximum of 34°C (93°F).
Precipitation levels also differ significantly; January receives 127 mm (5.0 in) of rain over approximately 12 days, while December sees a much wetter month with 233 mm (9.2 in) of rain across 20 days. Additionally, January has a higher humidity level at 85%, compared to December's 81%. For more detailed insights, you can check Rio das Ostras weather in December.
As January rolls into Rio das Ostras, the weather takes on a vibrant character, setting it apart from the cooler months. With maximum temperatures soaring to 36°C (97°F), the warmth is palpable, offering perfect beach weather for sunbathers and surfers alike. However, the month also sees a notable increase in humidity, hovering around 85%, which can make the heat feel more intense. Despite the glorious sunshine, expect occasional rain, with about 12 days of precipitation totaling 127 mm, providing respite and refreshment to the lush surroundings. This distinctive blend of warmth and moisture in January creates a unique climatic experience that encourages outdoor adventures. For a deeper dive into what to expect throughout the year, check out Rio das Ostras Climate.