Last updated: August 21, 2025
May in Haikou, China, unveils a climate marked by warm temperatures and high humidity, making it a unique time of year. With maximum highs soaring to 39°C (103°F) and an average temperature of 22°C (71°F), residents and visitors alike can expect a taste of summer's heat. However, the temperature range goes as low as 10°C (50°F), adding a hint of coolness to the mix. Rainfall is prevalent, with 207 mm (8.2 in) of precipitation spread over 15 days, contributing to the overall moisture levels at 87%. This blend of warmth and humidity creates a vibrant, lush environment that characterizes Haikou's May weather.
In May, Haikou experiences a notable shift towards warmer weather, setting the stage for the summer months. With minimum temperatures starting at a comfortable 10°C (50°F) and an average soaring to 22°C (71°F), the city becomes increasingly inviting. The **maximum temperature reaches a sizzling 39°C (103°F), showcasing the distinct transition from the cooler spring to the hot summer climate. This warming trend, observed throughout the month, indicates a dramatic rise in temperatures compared to the earlier months, making May a vibrant time for outdoor activities and exploration in this picturesque part of China. As days become longer and sunnier, residents and visitors alike can enjoy the increasing warmth and the lush, blooming environment that accompanies it.
In May, Haikou experiences a significant increase in precipitation, with 207 mm (8.2 in) of rain recorded over 15 days, marking the start of the wetter season. This substantial rainfall sets May apart as one of the wettest months of the year, following a relatively dry April. The rainfall not only supports the lush greenery of the region but also paves the way for the even more intense downpours of June, which typically sees the highest monthly total. As the city transitions into summer, the increase in both precipitation volume and precipitation days reflects a clear trend towards more rainfall, highlighting Haikou’s tropical climate and its shift from the drier months of earlier in the year.
In May, Haikou, China, experiences a notable peak in humidity, reaching 87%. This high level, consistent with the preceding month's measurement of 86%, marks the transition to summer when humidity typically intensifies. The trend indicates a steady increase from January’s 65%, gradually escalating through the spring months. By May, the humidity not only reflects the warming temperatures but also sets the stage for the even more humid conditions of July, which sees the highest average at 91%. Following this peak, humidity stabilizes during the summer before tapering off in the autumn months, demonstrating Haikou's characteristic tropical climate.
In May, Haikou experiences an extreme UV Index of 12, indicating that sun exposure can lead to sunburn in just 10 minutes. This pattern of high UV levels is consistent with the preceding months, as the UV Index escalates from high in January to very high in February and March, ultimately peaking at extremes in April and May. Such trends serve as a reminder for locals and visitors alike to prioritize sun safety during this time, as the harmful effects of UV radiation remain ever-present. As the temperature warms and outdoor activities increase, it's crucial to stay informed about the Haikou UV Index and take preventive measures to protect your skin.
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In Haikou, China, May ushers in a radiant peak of sunshine, boasting an impressive 254 hours of sun—continuing the upward trend that begins in the early months of the year. This month is a significant leap from the 245 hours recorded in April, illustrating a delightful transition into summer. Following May, the summer months of June and July also maintain abundant sunshine, with July peaking at 269 hours. However, as summer gives way to autumn, there is a gradual decline, with September and October experiencing a drop to 241 hours and 209 hours, respectively. This pattern of increasing sunlight in the spring followed by a summer surge, only to gently taper off, makes May a standout month, perfect for basking in the warmth and vibrant colors of the season.
In Haikou, China, the likelihood of sunny weather significantly declines as spring gives way to summer. While January boasts a 53% chance of sun, this figure takes a sharp turn downward, plummeting to just 14% by May. April, with a 26% chance, hints at fleeting sunshine, but by the time May arrives, it becomes the month with one of the lowest probabilities of sunlight. This downward trend continues into the summer months, leading to the least favorable conditions for sun-seekers. As a result, residents and visitors alike should prepare for the challenges of diminished sunshine during May, hoping for unexpected breaks in the cloud cover amidst the rising heat.
In Haikou, China, the daylight duration evolves significantly throughout the year, showcasing a clear seasonal rhythm. January begins with 10 hours of daylight, gradually increasing to 13 hours by May. This peak in daylight duration occurs during the late spring and early summer months of May, June, July, and August, where residents can bask in extended sunshine. As autumn approaches, daylight begins to taper off, returning to 12 hours in September and gradually diminishing to 10 hours by December. This cyclical pattern not only enhances outdoor activities during the vibrant summer months but also marks a transition into cozy, shorter days as the year winds down. Overall, Haikou's daylight landscape reflects a dynamic interplay between the seasons, providing a vibrant backdrop for both locals and visitors alike.
In Haikou, China, the winds of May present a gentle sigh, with an average speed of just 1.5 m/s (3 mph), marking a subtle dip compared to the preceding months. This calm breeze is a continuation of the slight downward trend observed since April, where winds were slightly breezier at 1.6 m/s (4 mph). Interestingly, as we transition into the sultry summer months, the winds tend to pick up again, with July returning to 1.8 m/s (4 mph). Overall, May reflects a serene atmosphere, ideal for outdoor activities, while hinting at the dynamic shifts in wind patterns that are characteristic of this coastal city throughout the year.
Weather in Haikou varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Haikou, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January present strikingly different weather conditions. In May, temperatures range from a mild 10°C (50°F) to a scorching maximum of 39°C (103°F), with an average of 22°C (71°F), while January experiences much cooler temperatures, with a minimum of -5°C (24°F) and a maximum of 26°C (79°F), averaging at 8°C (46°F). Additionally, May tends to be much wetter, receiving 207 mm (8.2 in) of rainfall over 15 days, compared to January's 44 mm (1.7 in) across just 7 days. The humidity levels also differ significantly, as May boasts a high of 87%, whereas January's humidity is considerably lower at 65%. For more details about January weather in Haikou, you can check Haikou weather in January.
May and February exhibit striking differences in weather patterns. In May, temperatures range from a chilly 10°C (50°F) to a scorching 39°C (103°F), with an average of 22°C (71°F) and a high humidity level of 87%. Rainfall is also significant during this month, with 207 mm (8.2 in) of precipitation over about 15 days. In contrast, February experiences much cooler temperatures, with a minimum of -5°C (22°F), an average of 9°C (48°F), and a maximum of 28°C (82°F). The total precipitation is considerably less, at 65 mm (2.6 in) over 9 days, and the humidity is lower at 71%. For more detailed information on February weather, visit Haikou weather in February.
The weather in May is characterized by significantly warmer temperatures compared to March, with average highs reaching 22°C (71°F) in May versus just 13°C (56°F) in March. While both months experience 15 days of precipitation, May sees a significantly higher total of 207 mm (8.2 in) compared to March's 122 mm (4.8 in). Additionally, May has a higher humidity level at 87%, compared to March's 81%. For a more detailed insight into the conditions, you can check out Haikou weather in March.
In comparing the weather between April and May, May experiences significantly warmer temperatures, with averages soaring to 22°C (71°F) compared to April's 17°C (63°F). The maximum temperature in May can reach as high as 39°C (103°F), contrasting sharply with April's peak of 33°C (92°F). Additionally, May is considerably wetter, receiving 207 mm (8.2 in) of precipitation over 15 days, while April sees only 97 mm (3.8 in) over 13 days. Despite the increased rainfall, the humidity remains relatively stable, with May at 87% and April at 86%. For more detailed information on April in Haikou, you can check Haikou weather in April.
In comparing the weather between May and June, May tends to be a transitional month with warmer daytime averages peaking at 39°C (103°F) and cooler nights dropping to 10°C (50°F). However, it also sees significant rainfall, accumulating 207 mm (8.2 in) over approximately 15 days, maintaining a high humidity level of 87%. In contrast, June brings slightly more warmth, with average temperatures rising to 25°C (76°F) and a minimum of 15°C (59°F). The month is wetter than May, with precipitation reaching 309 mm (12.1 in) across 20 days, while the humidity remains constant at 87%. Overall, both months feature high humidity and substantial rainfall, with June being warmer and wetter than May. For more details, check out Haikou weather in June.
In comparing the weather of May and July, we observe a distinct shift in temperature and conditions. May starts with minimum temperatures around 10°C (50°F) and averages around 22°C (71°F), peaking at a high of 39°C (103°F). It also experiences considerable precipitation, with 207 mm (8.2 in) over about 15 days, while maintaining a high humidity level of 87%. On the other hand, July features notably warmer temperatures, with a minimum of 20°C (69°F) and an average of 28°C (82°F), reaching a maximum of 37°C (100°F). Precipitation slightly decreases to 199 mm (7.9 in) but occurs over 18 days, and humidity rises to 91%. This indicates that while July is warmer overall, it also tends to be wetter and more humid. For additional details on July weather patterns, you can check Haikou weather in July.
May and August present contrasting yet similarly humid weather patterns. In May, temperatures range from a cooler minimum of 10°C (50°F) to a warm average of 22°C (71°F), peaking at a scorching 39°C (103°F). The month is also characterized by significant rainfall, with 207 mm (8.2 in) of precipitation over 15 days. In contrast, August offers a warmer climate, with minimum temperatures starting at 21°C (70°F) and an average of 28°C (82°F), reaching a maximum of 38°C (100°F). Rainfall decreases slightly to 159 mm (6.3 in), experienced over 17 days. Despite these shifts, the humidity remains constant at 87% in both months. For more details, check out Haikou weather in August.
Comparing the weather in May and September reveals notable differences in temperature and precipitation patterns. In May, temperatures range from a minimum of 10°C (50°F) to a maximum of 39°C (103°F), with an average of 22°C (71°F). This month experiences higher precipitation, totaling 207 mm (8.2 in) over about 15 days, accompanied by a high humidity level of 87%. In contrast, September enjoys slightly warmer temperatures, with a minimum of 15°C (59°F), an average of 25°C (77°F), and a maximum of 37°C (99°F). Additionally, this month sees significantly less precipitation at 98 mm (3.9 in) across 12 days, and humidity drops to a more comfortable 72%. For more detailed insights, you can check Haikou weather in September.
May and October present distinctly different weather patterns. In May, temperatures range from a minimum of 10°C (50°F) to a maximum of 39°C (103°F), with an average of 22°C (71°F). This month is marked by high humidity at 87% and significant rainfall, averaging 207 mm (8.2 in) over about 15 days. In contrast, October experiences milder conditions, with temperatures dropping to a minimum of 8°C (47°F) and a maximum of 35°C (96°F), averaging 19°C (67°F). Rainfall is much lower in October, totaling 66 mm (2.6 in) over just 7 days, and humidity decreases to 74%. For more details on October weather, you can explore Haikou weather in October.
May and November present strikingly different weather conditions. In May, temperatures range significantly from a minimum of 10°C (50°F) to a scorching maximum of 39°C (103°F), with an average of 22°C (71°F). This month also sees substantial rainfall, accumulating 207 mm (8.2 in) over approximately 15 days, all accompanied by high humidity levels at 87%. In contrast, November features much cooler temperatures, with a minimum of 2°C (36°F), an average of 14°C (58°F), and a maximum of 31°C (88°F). The precipitation is significantly lower at 64 mm (2.5 in), falling over about 8 days, and the humidity, though still high, is slightly lower at 80%. For a detailed overview of November conditions, you can check Haikou weather in November.
In May, the weather is significantly warmer and more humid, with temperatures ranging from a minimum of 10°C (50°F) to a blistering maximum of 39°C (103°F), accompanied by high precipitation of 207 mm over 15 days. In contrast, December experiences much cooler temperatures, with a minimum of -2°C (28°F) and a maximum of 28°C (83°F), resulting in an average temperature of only 9°C (48°F) and considerably less rainfall at 38 mm over just 8 days. The humidity in December is also lower at 78%, making it feel crisper compared to the sultry conditions of May. For more detailed information, check out Haikou weather in December.
May in Haikou signals a transition into the warmer, more humid months of the summer season. With temperatures rising significantly, it's a period where you might experience the city at its most vibrant, but also at its most humid, as relative humidity hovers around a sweltering 87%. The average temperature comfortably settles around 22°C, but the peaks can soar to a sizzling 39°C, making it imperative to stay hydrated. Unlike the drier months that precede it, May also sees an uptick in rainfall, with over two weeks of precipitation adding to the lush greenery that defines this coastal city. For a comprehensive look at the climate through the year, check out Haikou Climate.