Last updated: August 21, 2025
September in Haikou, China, offers a cozy climate with maximum temperatures reaching 28°C (82°F) and an average of 19°C (67°F). The month experiences a significant amount of rainfall, totaling 161 mm (6.3 in) over 22 days, creating a lush, vibrant atmosphere. With humidity levels soaring at 87%, visitors can expect a tropical feel that underscores the region's natural beauty. Ideal for those who appreciate warm, rainy days, September in Haikou is a delightful blend of temperature and moisture, perfect for immersing oneself in its rich culture and scenery.
In September, Haikou, China, experiences a gentle transition as summer wanes and autumn approaches. With temperatures ranging from a mild 11°C (52°F) to a comfortable 28°C (82°F), the average settles at a pleasant 19°C (67°F). This marks a slight dip from the sultry summer months, where highs hovered in the 29°C (85°F) range. As the days grow shorter and the air turns crisper, September offers a refreshing break, making it an ideal time for outdoor activities and exploring the beautiful coastal scenery. The gradually decreasing temperatures hint at the forthcoming fall, creating a harmonious blend of lingering warmth and cooler breezes.
September in Haikou, China, marks a notable transition in the rainfall pattern, with precipitation reaching 161 mm (6.3 in) over 22 days. This represents a significant drop compared to the peak of the rainy season in July and August, which boasted over 270 mm of rain. The month sees a decrease in both the intensity and frequency of showers, reflecting a shift towards drier conditions as the region moves into autumn. However, September's rainfall still maintains a substantial presence, continuing the trend of consistent precipitation throughout the warmer months. This blend of dwindling rainfall and lingering humidity sets the stage for the upcoming months, with October likely offering even drier conditions.
As September rolls into Haikou, China, the city experiences a notable level of humidity, averaging 87%. This marks a slight decrease from the peak humidity levels of 90% seen in August, yet it remains high as the transition to autumn begins. The trend throughout the year reveals distinct seasonal shifts: starting from a more comfortable 58% in January, humidity steadily rises, peaking in the summer months of June through August. This cycle underscores Haikou’s tropical climate, where the sultry air lingers well into September, serving as a reminder of the region's warm and humid character even as cooler months approach. Such humidity levels not only shape the weather but also influence the vibrant local culture and lifestyle.
In September, Haikou, China, experiences a UV Index of 13, categorized as extreme, with a burn time of just 10 minutes. This month continues the trend of heightened UV exposure that has been evident since March, where the index peaked at 16 in July. Although September sees a slight decrease from August's 14, it still necessitates vigilance as the potential for skin damage remains high. Throughout the year, the UV Index in Haikou often oscillates between very high and extreme categories, emphasizing the importance of sun protection, especially during the peak summer months. As we transition into autumn, while the index will eventually lower, residents and visitors should remain aware of the lingering risks associated with intense UV radiation. For more detailed information, check out Haikou UV Index.
UV Risk Categories
September in Haikou, China, bathes the city in a warm embrace of 284 hours of sunshine, continuing a delightful trend of bright skies as summer transitions to autumn. Following the peak of 333 hours in May, the sunlight begins to gradually decrease, yet September retains a vibrant glow, making it the perfect time to enjoy outdoor activities. The month outshines its predecessors, July and August, which offered 275 and 300 hours, respectively. As the sun shines brightly, it sets the stage for a comfortable climate, inviting both locals and travelers to explore the natural beauty and cultural charm of Haikou before the cooler months roll in. Overall, September's sun-filled days maintain a consistent brightness that marks the gentle winding down of summer's hold.
September in Haikou, China, sees a 35% chance of sun, which reflects a slight increase from the summer months when the likelihood plummets to 12-18%. This drop during June through August indicates the influence of the monsoon season, characterized by increased rainfall and humidity. As September rolls in, residents and visitors may find a glimmer of hope for brighter days, but the chances of sunny weather remain moderate. Notably, the likelihood of sunny conditions begins to pick up again in the fall months, with October and November showing slight improvements, suggesting a transition towards a more pleasant climate as the year progresses. Overall, while September may not boast the highest sun probability, it marks the beginning of a gradual recovery from the summer's dreary spells.
September marks a gentle transition in Haikou, China, as daylight hours begin to wane from the summer peak. With 12 hours of daylight, this month mirrors April and March, signaling a gradual shift from the prolonged brightness of summer. As daylight duration transitions from the highs of 13 hours in June through August, the days still retain warmth and a vibrant atmosphere before dipping to 11 hours in October. This pattern underscores a rhythmic ebb and flow of daylight that characterizes Haikou's tropical climate, inviting residents and visitors alike to savor the lingering daylight before the cooler months set in.
As September rolls in, Haikou experiences its calmest winds of the year, with an average speed dropping to 2.0 m/s (4 mph), mirroring the gentle breeze typical of the summer months. This serene atmosphere follows the gradual increase in wind speeds from March through May, where the winds were more invigorating, peaking at 4.2 m/s (9 mph) in March. However, summer's heat appears to temper the winds, leading to even gentler gusts in June and July. As autumn approaches, the trend continues with September's soft winds, creating an idyllic setting perfect for leisurely strolls along the coast or savoring the scenery in this vibrant city. The transition into October sees a slight uptick to 2.8 m/s (6 mph), hinting at a return to more refreshing breezes as the season changes.
Weather in Haikou varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Haikou, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is characterized by warmer temperatures, with a minimum of 11°C (52°F) and a maximum reaching up to 28°C (82°F). This month experiences significant precipitation, averaging 161 mm (6.3 in) over about 22 days, alongside high humidity levels of 87%. In contrast, January presents a much cooler climate, featuring temperatures that range from a minimum of -2°C (29°F) to a maximum of 21°C (70°F) and showcasing a drastic reduction in rainfall, with only 39 mm (1.5 in) over just 4 days. Additionally, the humidity drops to a more temperate 58%. For more detailed information, you can check Haikou weather in January.
In comparing the weather between September and February, September shows a much warmer climate with average temperatures ranging from 11°C (52°F) to 28°C (82°F), while February offers cooler conditions with temperatures from 0°C (31°F) to 24°C (75°F). Additionally, September experiences significantly higher humidity at 87% and more frequent rainfall, averaging 161 mm over 22 days, compared to February's modest 20 mm of precipitation over just 3 days. This stark difference highlights September's wet and humid environment versus February's cooler, drier conditions. For more details, you can check Haikou weather in February.
In September, the weather is characterized by warmer temperatures, with averages peaking at 28°C (82°F) and a high humidity level of 87%, which can make the heat feel quite intense. This month also experiences substantial rainfall, with 161 mm (6.3 in) over 22 days, making it one of the wetter times of the year. In contrast, March offers a more temperate climate, featuring a milder average temperature of 16°C (61°F) and a max of 29°C (84°F). The humidity drops significantly to 44%, and the month sees far less precipitation at just 25 mm (1.0 in) over only 5 days. For more details on this month's weather, check out Haikou weather in March.
When comparing the weather in September and April, notable differences emerge. September typically experiences milder temperatures, with averages around 19°C (67°F) and highs reaching 28°C (82°F). However, it is also marked by high humidity at 87% and significant rainfall, with precipitation occurring on about 22 days and totaling 161 mm (6.3 in). In contrast, April boasts a slightly warmer average temperature of 18°C (64°F) but can peak at a high of 31°C (88°F). The month is significantly drier, with only 64 mm (2.5 in) of rain over 8 days and a notably lower humidity of 44%. These differences highlight April as a warmer and considerably drier month compared to the often wet and humid September. For a detailed overview, you can check Haikou weather in April.
In comparing September and May weather, September presents milder temperatures, with averages around 19°C (67°F), while May enjoys slightly warmer conditions, averaging 20°C (69°F). However, May can reach higher maximum temperatures of 32°C (91°F), significantly warmer than September’s peak of 28°C (82°F). Precipitation levels also differ considerably; September sees a substantial 161 mm (6.3 in) over 22 days, whereas May experiences much lighter rainfall, totaling only 65 mm (2.6 in) across just 8 days. Additionally, September's humidity is notably higher at 87%, compared to May’s more comfortable 62%. For more details, check out Haikou weather in May.
In comparing the weather of September and June, we observe distinct differences in temperature and precipitation patterns. September features a slightly cooler average temperature, ranging from a minimum of 11°C (52°F) to a maximum of 28°C (82°F), while June typically experiences warmer conditions with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 31°C (87°F). Additionally, September receives considerable rainfall, totaling 161 mm (6.3 in) over 22 days, while June has even higher precipitation levels at 201 mm (7.9 in) across 20 days; however, the humidity is a bit higher in September at 87% compared to June's 82%. For a more detailed look at the weather conditions in June, you can explore Haikou weather in June.
When comparing the weather in September and July, September generally experiences slightly cooler temperatures with a minimum of 11°C (52°F) and a maximum of 28°C (82°F), while July's temperatures are warmer, ranging from a minimum of 14°C (58°F) to a maximum of 29°C (84°F). Both months are relatively humid, with September at 87% and July slightly higher at 89%. Precipitation is more pronounced in July, accumulating 271 mm (10.7 in) over 26 days, compared to September's 161 mm (6.3 in) across 22 days. For a more detailed look at July weather, you can check Haikou weather in July.
In comparing the weather of September and August, we see notable differences in both temperature and precipitation. September tends to be cooler, with average temperatures ranging from a minimum of 11°C (52°F) to a maximum of 28°C (82°F), while August's temperatures are slightly warmer, averaging between 16°C (60°F) and 29°C (85°F). Additionally, September experiences noticeably less precipitation, with 161 mm (6.3 in) over 22 days, compared to August's 268 mm (10.5 in) spread across 26 days. Humidity levels are slightly lower in September at 87%, compared to 90% in August. For more detailed insights, check out Haikou weather in August.
In September, temperatures typically range from a minimum of 11°C (52°F) to a maximum of 28°C (82°F), with an average of 19°C (67°F). The month experiences significant rainfall, totaling 161 mm (6.3 in) over 22 days, contributing to a high humidity level of 87%. In contrast, October sees slightly cooler weather, with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 26°C (78°F), and an average of 17°C (62°F). Precipitation decreases to 89 mm (3.5 in) over 17 days, and humidity lowers to 81%. For more details about the weather during this time, visit Haikou weather in October.
In September, the weather is generally warmer with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 28°C (82°F), averaging around 19°C (67°F). This month also sees significant rainfall, with 161 mm (6.3 in) over 22 days and a high humidity level of 87%. In contrast, November experiences cooler temperatures, with a range from 5°C (40°F) to 24°C (75°F) and an average of 13°C (56°F). Precipitation drops considerably to 32 mm (1.3 in) spread over just 6 days, along with slightly lower humidity at 82%. For more detailed information about November weather, you can visit Haikou weather in November.
In September, the weather is notably warmer with average temperatures ranging from a minimum of 11°C (52°F) to a maximum of 28°C (82°F), making it a pleasant time for outdoor activities. However, it also experiences significant rainfall, with over 161 mm (6.3 in) of precipitation spread across 22 days, resulting in high humidity levels at 87%. Conversely, December brings a dramatic shift in weather, characterized by cooler temperatures that range from a minimum of -1°C (30°F) to a maximum of 21°C (69°F). Precipitation drops significantly to just 23 mm (0.9 in) over 4 days, and the humidity decreases to 73%, making the month considerably drier and more comfortable. For more detailed information on December's climate, check out Haikou weather in December.
As September unfolds in Haikou, the weather takes on a unique character, marked by a blend of warmth and humidity. With average temperatures settling around a comfortable 19°C, this month offers a transition from the heat, bringing a refreshing shift as autumn approaches. However, the high humidity levels and increased rainfall—spanning 22 days with a total precipitation of 161 mm—set September apart from the drier summer months. This combination of warm temperatures and frequent showers creates a lush environment, making it a vibrant time to experience Haikou's natural beauty. For a deeper dive into what to expect, check out Haikou Climate.