Last updated: August 21, 2025
In Niteroi, Brazil, May welcomes the transition into cooler months, with maximum temperatures reaching 33°C (91°F) and a comfortable average of 23°C (74°F), offering pleasant days for outdoor activities. The nights are mild, cooling down to a minimum of 16°C (61°F). This month also sees an average precipitation of 73 mm (2.9 in) over approximately 10 days, contributing to the lush greenery characteristic of Niteroi. With a relatively high humidity level of 81%, May's weather combines warmth with a refreshing tropical atmosphere, ideal for both locals and visitors to explore the city's scenic beauty.
As May unfolds in Niteroi, Brazil, the temperatures begin to reflect the subtle transition towards the cooler months of winter. With a minimum of 16°C (61°F) and a comfortable average of 23°C (74°F), the city offers a pleasant reprieve from the sweltering heat of earlier months. Daytime highs reach a still-warm 33°C (91°F), allowing for plenty of sunshine while not being overwhelmingly hot. This month marks a notable shift from the consistent warmth of summer, as temperatures gradually dip compared to April's lingering heat. Visitors and locals alike can enjoy the beautiful beaches and vibrant outdoor activities in a more moderate climate, making May a delightful time to experience all that Niteroi has to offer.
In May, Niteroi experiences a noticeable decrease in precipitation, recording 73 mm (2.9 in) over just 10 days of rain. This marks a shift from the heavier rainfall noted in earlier months, particularly March, which saw the highest accumulation at 138 mm (5.4 in). As the city transitions into the drier months, May's rainfall is relatively light compared to January through April, suggesting a trend towards less frequent but still significant showers. This pattern reflects Niteroi’s shifting climate as the southern hemisphere moves towards winter, with the subsequent months continuing this decline, ultimately reaching a yearly low in July with only 35 mm (1.4 in), offering a reprieve from the tropically wet conditions of the early year.
In Niteroi, Brazil, May marks a transitional phase in humidity levels, showcasing a slight decrease to 81%. As the warm summer months of January and February linger with humidity peaking at 85%, there is a gradual decline through the following months, suggesting a shift towards drier conditions. Despite May's modest reduction, the environment remains comfortably humid, setting the stage for the cooler winter months when humidity continues to drop, reaching a minimum of 76% in July. This trend reflects a natural ebb and flow, with each month inviting residents and visitors alike to experience the unique climate that defines this vibrant coastal city.
In May, Niteroi experiences a UV Index of 7, placing it in the high exposure category, with a burn time of about 25 minutes for unprotected skin. Compared to the extreme levels observed in the earlier months of the year, such as January's staggering UV Index of 15, May brings a slight reprieve, though caution is still advised. The trend shows a gradual decline from January's extreme conditions, tapering off to a more manageable level by late spring. This pattern continues into June and July, where the UV Index remains consistently high at 6 and 7, respectively, reinforcing the importance of sun protection during these months. For further details on UV levels, visit the Niteroi UV Index.
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May in Niteroi, Brazil, welcomes a delightful average of 282 sunshine hours, continuing a pattern of ample light in the first half of the year. Following the sunlit high of March at 309 hours, which sets a vibrant tone for early autumn, May gently dips but still offers generous daylight. This month stands out amidst a steady decline from April's 296 hours, showcasing the region's commitment to bright, beautiful days even as the year progresses. The sunshine seamlessly transitions to June with 276 hours, hinting at the subtle shifts in seasonal warmth while ensuring that outdoor adventures can still be enjoyed to the fullest. As Niteroi basks in May’s golden glow, the community thrives, capturing the essence of Brazil's captivating coastal beauty.
In Niteroi, Brazil, May marks a transitional phase in the weather, showcasing a 49% chance of sunny days. This figure reflects a slight decline from the sunnier conditions of April, which enjoys a 54% likelihood, yet it still offers a reasonable expectation for pleasant weather. Notably, as we move from the first quarter of the year into the latter months, the likelihood of sunshine generally trends upward, peaking in the mid-year months, particularly July and August with 58% and 60% chances, respectively. Thus, while May presents a bit of uncertainty, it retains enough potential for sunny escapades, hinting at the promising days that follow.
In Niteroi, Brazil, daylight duration showcases a captivating seasonal rhythm. The year begins with a generous 13 hours of daylight in January, gradually shifting to 12 hours in February and March, before dipping to 11 hours in April. As May arrives, daylight hits a low of 10 hours, a trend that continues through June and July, creating a sense of cozy, extended evenings. However, as spring approaches in August, daylight begins to lengthen once more, rising back to 11 hours by September. This gradual increase continues, culminating in 12 hours in October and 13 hours again in November and December, marking a vibrant return to longer days just in time for the festive season. The cycle reflects the enchanting dance between light and dark, bringing unique charm to each month in Niteroi.
In May, Niteroi experiences a gentle breeze with an average wind speed of 2.4 m/s (5 mph), marking a slight dip from the previous month. This trend of moderate winds continues from the spring months, where winds hover around similar speeds in both January and April at 3.4 m/s. As the year progresses into June and the summer months, the winds pick up again, reaching 3.1 m/s. Observing the winds throughout the year, it’s clear that August through October sees an uptick, peaking at 4.2 m/s in October, suggesting a seasonal pattern where winds strengthen as the region transitions into late spring and early summer. Overall, May reflects a serene period, nestled between the brisk whispers of autumn and the lively gales of summer.
Weather in Niteroi varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Niteroi, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between May and January, we see notable differences in temperature and precipitation. May experiences milder temperatures, with a minimum of 16°C (61°F) and an average of 23°C (74°F), while January has warmer conditions, starting at a minimum of 21°C (70°F) and averaging 27°C (81°F). Both months have similar maximum temperatures, with January peaking at 34°C (94°F) compared to May's 33°C (91°F). Precipitation levels are slightly higher in January, with 91 mm (3.6 in) over 11 days, contrasted with May's 73 mm (2.9 in) spread over 10 days. Humidity is also marginally higher in January at 85% compared to May’s 81%. For more detailed insights, you can check out Niteroi weather in January.
When comparing the weather in May and February, several key differences stand out. February tends to be warmer, with average temperatures ranging from a minimum of 21°C (71°F) to a maximum of 35°C (95°F), while May has a cooler range with highs averaging 33°C (91°F) and lows at 16°C (61°F). In terms of precipitation, February experiences more rainfall, totaling 119 mm (4.7 in) across 15 days, compared to May's 73 mm (2.9 in) over 10 days. Additionally, humidity levels are slightly higher in February at 85%, compared to 81% in May. For more insights on February weather specifically, you can explore this link: Niteroi weather in February.
In comparing the weather between March and May, we see some notable differences. March experiences slightly higher average temperatures, with a minimum of 20°C (69°F) and a maximum of 34°C (94°F), while May has a minimum of 16°C (61°F) and a maximum of 33°C (91°F). Alongside this, March also sees significantly more precipitation, totaling 138 mm (5.4 in) over 16 days compared to May's 73 mm (2.9 in) over 10 days. Additionally, humidity levels are higher in March, at 86%, compared to May's 81%. For more detailed weather insights, you can check Niteroi weather in March.
In comparing the weather between April and May, April generally experiences warmer temperatures, with a minimum of 19°C (67°F) and an average of 25°C (77°F), peaking at a maximum of 34°C (93°F). In contrast, May sees a slightly cooler range, with minimums of 16°C (61°F), an average of 23°C (74°F), and highs reaching 33°C (91°F). Additionally, April has higher precipitation levels at 81 mm (3.2 in) over 14 days, compared to May's 73 mm (2.9 in) over 10 days, while humidity remains fairly consistent with April at 83% and May at 81%. For further details, check Niteroi weather in April.
May and June weather in Niteroi showcases some subtle differences. In May, temperatures range from a minimum of 16°C (61°F) to a maximum of 33°C (91°F), with an average of 23°C (74°F). The month experiences around 73 mm (2.9 in) of precipitation over 10 days, coupled with a humidity level of 81%. In contrast, June sees slightly cooler temperatures, with a minimum of 16°C (62°F) and a maximum of 31°C (89°F), averaging 22°C (73°F). Precipitation drops to 39 mm (1.5 in) over just 9 days, and humidity remains relatively stable at 80%. For more specific weather insights, check out Niteroi weather in June.
In comparing the weather between May and July, we observe some notable differences. May tends to be warmer overall, with average temperatures peaking at 23°C (74°F) compared to July's average of 21°C (71°F). While both months can reach high temperatures, May records a maximum of 33°C (91°F), slightly higher than July's maximum of 32°C (90°F). Additionally, May experiences more precipitation, with 73 mm (2.9 in) over 10 days, contrasted with July's lighter rainfall of 35 mm (1.4 in) for just 6 days. Humidity also decreases slightly from May's 81% to July's 76%, making July a bit more comfortable overall. For more specific insights, you can check out Niteroi weather in July.
In comparing the weather of May and August, May tends to be slightly warmer, with average temperatures around 23°C (74°F) compared to August's average of 21°C (71°F). Additionally, May experiences more humidity at 81%, while August has a more comfortable level at 73%. Precipitation is relatively similar, with May receiving 73 mm (2.9 in) over about 10 days, while August sees a bit less at 68 mm (2.7 in) but over 11 days. For more specific details about August weather, you can check Niteroi weather in August.
In May, temperatures typically range from a minimum of 16°C (61°F) to a maximum of 33°C (91°F), with an average temperature of 23°C (74°F). The month experiences approximately 73 mm (2.9 in) of precipitation over 10 days, and humidity levels are quite high at 81%. In contrast, September sees slightly warmer temperatures, with a minimum of 17°C (63°F) and a maximum of 34°C (94°F), while still maintaining the same average of 23°C (74°F). Precipitation in September drops to 48 mm (1.9 in) over 8 days, and humidity levels decrease to a more comfortable 68%. For more details, you can check out Niteroi weather in September.
In May, temperatures typically range from a minimum of 16°C (61°F) to a maximum of 33°C (91°F), with an average of 23°C (74°F). The month experiences significant humidity at 81% and receives around 73 mm (2.9 in) of precipitation over about 10 days. In contrast, October showcases slightly warmer temperatures, with a minimum of 17°C (63°F), an average of 24°C (75°F), and a maximum reaching 36°C (97°F). While October has less humidity at 61%, it sees an increase in rainfall, totaling 86 mm (3.4 in) over approximately 14 days. For more detailed weather information, you can visit Niteroi weather in October.
May and November exhibit distinct weather patterns, reflecting the transition from late spring to late fall. In May, temperatures range from a minimum of 16°C (61°F) to a maximum of 33°C (91°F), with an average of 23°C (74°F). The month sees about 73 mm (2.9 in) of precipitation over approximately 10 days, contributing to a relatively high humidity of 81%. In contrast, November experiences slightly warmer weather, with temperatures varying from 18°C (64°F) to 34°C (94°F) and an average of 24°C (75°F). However, it also sees more rain, totaling 115 mm (4.5 in) over around 16 days, while humidity drops to 72%. For more details, check out Niteroi weather in November.
In comparing the weather between May and December, we can observe some notable differences. May typically enjoys a more moderate range of temperatures, with minimums around 16°C (61°F) and maximums reaching up to 33°C (91°F), while December maintains a slightly warmer minimum of 19°C (67°F) and the same maximum of 33°C (92°F). However, December experiences more precipitation, averaging 121 mm (4.8 in) over 15 days compared to May's 73 mm (2.9 in) over 10 days. Humidity levels also differ slightly, with May being a bit more humid at 81%, while December's humidity sits at 75%. For a deeper look into December's weather, check out Niteroi weather in December.
In May, Niteroi experiences a delightful shift in weather, characterized by warm days and cooler nights, making it a welcomed reprieve from the more intense heat of other months. With an average temperature of around 23°C, outdoor activities become even more enjoyable, despite a modest increase in humidity at 81%. While the precipitation in May does see a rise with about ten days of rain, it is generally manageable and adds a refreshing touch to the lush landscapes. This transitional month is perfect for those looking to explore the beauty of Niteroi under pleasantly warm skies. For a deeper understanding of Niteroi's weather patterns throughout the year, visit Niteroi Climate.