Last updated: August 28, 2025
In Hanoi, Vietnam, the weather in May is characterized by warm temperatures and significant humidity. With maximums reaching up to 39°C (103°F) and an average of 28°C (83°F), the heat is palpable, while evenings offer a respite with minimums around 19°C (67°F). This month sees approximately 188 mm (7.4 in) of rainfall, spread over 17 days, contributing to a humidity level of 73% that can make the air feel even warmer. As the city transitions into the summer season, May brings a vibrant and lush landscape, enticing locals and tourists alike to explore its rich culture despite the occasional downpour.
In May, Hanoi experiences a noticeable shift towards warmer temperatures, with minimums rising to 19°C (67°F) and averages reaching around 28°C (83°F). This month marks the transition into the summer heat, where the maximum temperature can soar to a scorching 39°C (103°F), making it one of the hottest times of the year. As Hanoi basks in increasing warmth, the days grow longer and sunnier, setting the stage for vibrant outdoor activities and the lush landscapes that define this captivating city. The rising heat from April to May signals not just a change in temperature, but also a burgeoning energy in the city, inviting both locals and travelers to embrace the bustling street life and rich culture amidst the warm embrace of summer.
May marks a notable peak in precipitation in Hanoi, Vietnam, receiving an impressive 188 mm (7.4 in) of rain over 17 days. This substantial increase follows April's 147 mm (5.8 in) and sets the stage for the wetter months ahead, with June closely trailing at 189 mm (7.4 in). The onset of the monsoon season is evident as May's rainfall not only surpasses the preceding months significantly but also indicates a trend of increasing precipitation that will crescendo in the summer months. The frequent rain showers transform the city, providing lush greenery, but also remind residents to prepare for the challenges of the impending wet season.
In Hanoi, May marks a notable uptick in humidity, climbing to 73% after a milder April at 64%. This transition signals the onset of the hot season, as the city prepares for the sweltering summer months ahead. Just a month later, in June, humidity surges to 81%, ultimately peaking in the heat of July at a staggering 90%. The trend clearly showcases the city's increasing moisture levels as the year progresses, particularly from late spring into summer, with August and September remaining high at 89% and 82%, respectively. Overall, May serves as a precursor to the increasingly humid conditions that define Hanoi's summer, hinting at the tropical climate that envelops the city during this vibrant time of year.
In May, Hanoi experiences an extreme UV Index of 13, indicating that sun exposure can lead to skin damage in just 10 minutes. This trend of climbing UV levels starts in March and maintains its peak intensity through the summer months, reflecting a broader pattern of heightened solar radiation in Southeast Asia. As the temperatures rise, remember to take precautions to protect your skin, especially since the UV Index remains high throughout the subsequent months of June and July. Stay informed about daily UV levels by checking Hanoi UV Index to ensure you enjoy the sun safely!
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As May unfolds in Hanoi, the city basks in a generous 280 hours of sunshine, marking a vibrant peak in the year’s daylight hours. This significant increase from the previous months highlights a clear upward trend, as Hanoi transitions from the cooler, cloudier days of early spring. With April’s sunshine clocking in at 187 hours, May bursts forth with warmth, setting the stage for summer's arrival. The sunny days of May not only elevate the city's mood but also invigorate the lush landscapes, making it an ideal time for outdoor exploration and cultural experiences. Following May's brightness, June and July maintain the momentum with 275 and 274 hours of sunshine, respectively, creating a sun-soaked stretch for residents and visitors alike to enjoy.
In Hanoi, Vietnam, the likelihood of sunny weather in May stands at a moderate 31%, which is consistent with the trends seen in the months leading up to it. After the somewhat dreary months of March and April, where sunshine chances plummet to 18%, May marks a welcome return to brightness, comparable to the earlier months of the year, January and February, which each boast a 32% chance of sun. However, as the summer months approach, the chances of sunny days dip beginning in June and remain low through August. Thus, May offers a promising window for enjoying pleasant weather before the Vietnamese heat settles in, making it an ideal time for outdoor activities and exploration.
In Hanoi, Vietnam, the daylight duration gradually increases from 10 hours in January to a peak of 13 hours during the summer months of May, June, and July. This extended daylight aligns perfectly with the vibrant atmosphere of the city as it fully embraces the warmth of spring and early summer. As May approaches, residents and visitors alike enjoy longer evenings filled with activities under the sun. However, as the year progresses into late summer and autumn, daylight begins to wane, returning to 12 hours in August and gradually decreasing to 10 hours by December. This rhythmic cycle not only marks the changing seasons but also enriches the cultural tapestry of Hanoi, encouraging outdoor festivities and a deeper connection with nature throughout the brighter days.
In May, the winds of Hanoi begin to pick up, culminating in an average speed of 2.8 m/s (6 mph), just slightly breezier than the preceding months. This gentle increase from April's steady 2.6 m/s brings a refreshing change as the city transitions into the warmth of summer. While wind speeds experience a gradual decline in the subsequent months, May stands out as a pivotal moment in the yearly cycle, marking the shift towards heightened humidity and vibrant growth in the lush surroundings. The delightful breeze not only enhances the charm of Hanoi's streets but also signals nature's awakening, inviting residents and visitors alike to embrace the beauty of the season.
Weather in Hanoi varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Hanoi, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January present contrasting weather patterns. In May, temperatures soar, ranging from a minimum of 19°C (67°F) to a maximum of 39°C (103°F), with an average temperature of 28°C (83°F). This month also sees significant rainfall, with 188 mm (7.4 in) of precipitation over 17 days, contributing to a higher humidity level of 73%. In stark contrast, January offers cooler conditions, with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 29°C (84°F) and an average temperature of 18°C (65°F). Additionally, January experiences much less precipitation at 58 mm (2.3 in) over only 8 days and a lower humidity of 66%. For more specific details, you can check Hanoi weather in January.
When comparing the weather in May and February, it’s clear that May is significantly warmer. With temperatures ranging from a minimum of 19°C (67°F) to a maximum of 39°C (103°F), it offers an average temperature of 28°C (83°F). In contrast, February is much cooler, featuring a minimum temperature of 9°C (48°F) and a maximum of 31°C (88°F), with an average of 19°C (66°F). Additionally, May experiences much higher precipitation, with 188 mm (7.4 in) over 17 days, compared to February’s 41 mm (1.6 in) over just 7 days. Both months display similar humidity levels, with February slightly lower at 71% compared to May's 73%. For more detailed insights, you can explore Hanoi weather in February.
In comparing the weather of May and March, May experiences significantly higher temperatures, with average highs reaching up to 39°C (103°F) compared to March's maximum of 34°C (94°F). The minimum temperatures in May are also notably warmer, starting at 19°C (67°F), while March begins at a cooler 14°C (57°F). Additionally, May sees a much heavier rainfall, with 188 mm (7.4 in) spread over 17 days, whereas March receives only 65 mm (2.5 in) over 14 days. Humidity levels are slightly higher in May at 73%, compared to March’s 69%, contributing to a more oppressive feel during the late spring month. For more detailed insights into March weather, you can visit Hanoi weather in March.
In comparing the weather between April and May, we see a noticeable increase in temperature and humidity during May. The average temperature rises from April's 25°C (77°F) to a warmer 28°C (83°F) in May, with maximum temperatures reaching up to 39°C (103°F) compared to April's peak of 36°C (97°F). Additionally, May experiences higher humidity at 73%, up from April's 64%. Precipitation also increases in May, totaling 188 mm (7.4 in) over 17 days, compared to April's 147 mm (5.8 in) over 14 days. For more detailed information, you can refer to Hanoi weather in April.
May and June in Hanoi showcase gradually increasing temperatures and humidity. In May, temperatures range from a minimum of 19°C (67°F) to a maximum of 39°C (103°F), with an average of 28°C (83°F), while June sees a slight increase, with minimum temperatures at 23°C (74°F) and a peak of 40°C (105°F), averaging 31°C (87°F). Both months experience similar rainfall, with May receiving 188 mm (7.4 in) over 17 days and June slightly more at 189 mm (7.4 in) spread across just 15 days. Notably, June has a higher humidity level at 81%, compared to May's 73%. For more detailed insights, check out Hanoi weather in June.
In May, the weather features a warm range with minimum temperatures around 19°C (67°F) and maximums peaking at 39°C (103°F), accompanied by an average temperature of 28°C (83°F). However, this month also experiences significant rainfall, with 188 mm (7.4 in) over 17 days and a humidity level of 73%. By contrast, July brings even warmer conditions, with minimum temperatures rising to 25°C (78°F) and average highs of 30°C (86°F). The rainfall in July increases to 260 mm (10.2 in) over 21 days, resulting in a higher humidity level of 90%. For more detailed insights, check out Hanoi weather in July.
May and August in Hanoi both experience high temperatures, with average highs reaching up to 39°C (103°F) in May and slightly lower at 39°C (102°F) in August. However, May tends to be warmer overall, with an average temperature of 28°C (83°F) compared to 29°C (85°F) in August. Humidity levels are notably higher in August, reaching 89% compared to May's 73%. Additionally, August sees significantly more rainfall, with precipitation totaling 378 mm (14.9 in) over 22 days, compared to May's 188 mm (7.4 in) over 17 days. For more detailed information, you can check Hanoi weather in August.
In comparison to May, September generally experiences slightly warmer minimum temperatures, with a low of 21°C (71°F) as opposed to May's 19°C (67°F). The average temperature remains consistent at 28°C (83°F) in both months; however, September features a slightly cooler maximum of 37°C (99°F), compared to May's peak of 39°C (103°F). Precipitation levels increase in September, with an average of 222 mm (8.7 in) over 21 rainy days, compared to May's 188 mm (7.4 in) over 17 rainy days. Additionally, September sees a higher humidity level at 82%, contrasting with May's 73%. For a more detailed view, check out Hanoi weather in September.
May and October exhibit distinct weather patterns, reflecting a transition in the season. In May, temperatures range from a minimum of 19°C (67°F) to a maximum of 39°C (103°F), with an average temperature of 28°C (83°F). The month sees substantial rainfall, with 188 mm (7.4 in) of precipitation over 17 days and a humidity level of 73%. In contrast, October features slightly cooler temperatures, ranging from a minimum of 17°C (63°F) to a maximum of 34°C (94°F), averaging 25°C (78°F). Rainfall is more significant in October, with 279 mm (11.0 in) across 16 days and a higher humidity of 77%. For a closer look at October weather specifics, you can check Hanoi weather in October.
In May, the weather is characterized by much warmer temperatures, ranging from a minimum of 19°C (67°F) to a scorching maximum of 39°C (103°F), with an average temperature of 28°C (83°F). This month also sees significant rainfall, with 188 mm (7.4 in) of precipitation spread over 17 days, contributing to a high humidity level of 73%. In contrast, November experiences milder conditions, featuring a minimum temperature of 14°C (57°F) and a maximum of 33°C (92°F), with an average of 22°C (73°F). Precipitation decreases dramatically to 48 mm (1.9 in) over just 8 days, and humidity remains relatively constant at 72%. For more details, check out Hanoi weather in November.
May and December present contrasting weather patterns in Hanoi. In May, temperatures range from a minimum of 19°C (67°F) to a scorching maximum of 39°C (103°F), with an average of 28°C (83°F). This month also experiences significant rainfall, totaling 188 mm (7.4 in) over 17 days, accompanied by humidity levels at 73%, making the air feel quite muggy. In stark contrast, December boasts milder temperatures, with a minimum of 8°C (47°F) and a peak of 31°C (87°F), averaging around 18°C (65°F). Rainfall in December is considerably lower, at just 41 mm (1.6 in) over 7 days, and humidity is slightly lower at 71%, resulting in a more comfortable atmosphere overall. For more detailed insights about December weather, you can check Hanoi weather in December.
May in Hanoi ushers in a noticeable shift in weather, characterized by a warm embrace of high temperatures that can soar to a peak of 39°C. While the average temperature settles comfortably around 28°C, the days are frequently interrupted by rain—with nearly half the month experiencing some precipitation. This blend of warmth and heightened humidity levels gives May a distinctly muggy feel, setting it apart from both the cooler spring months and the increasingly hot summer ahead. For a comprehensive understanding of what to expect, be sure to check out Hanoi Climate.