Last updated: August 21, 2025
In Amami, Japan, September brings a warm embrace as temperatures typically range from a maximum of 30°C (87°F) to an average of 27°C (82°F) and a minimum of 24°C (75°F). This month is characterized by its lush greenery, nourished by 223 mm (8.8 in) of rainfall spread across 20 days, resulting in an inviting humidity level of 81%. September's weather creates a tropical atmosphere that delights the senses, making it an ideal time to experience Amami's vibrant natural beauty.
In September, Amami, Japan, experiences a gradual transition as summer lingers with temperatures that begin to hint at the upcoming autumn. With minimums of 24°C (75°F) and average highs reaching 30°C (87°F), the month remains warm and inviting, making it an ideal time for outdoor activities. This warmth is complemented by an average temperature of 27°C (82°F), which is slightly lower than the peak summer months of July and August but still comfortably tropical. As the days shorten and the sea begins to cool, September marks a subtle shift in the season while retaining the vibrancy of summer, enticing visitors to enjoy the beautiful landscapes and rich culture of Amami before the cooler months arrive.
In September, Amami, Japan, experiences a notable increase in precipitation, receiving 223 mm (8.8 in) of rain over the course of 20 days. This marks a continuation of the region's wet season, with rainfall peaking in June and gradually tapering off as the year progresses. The September rainfall is significant, reflecting the seasonal transition, and is higher than the previous months of July and August. As the island emerges from summer, the consistent rainfall not only nourishes the lush, vibrant landscapes but also prepares it for the drier fall months ahead. This trend highlights September as a critical month in the annual precipitation cycle for Amami, merging heavy rainfall with the enchanting beauty of autumn.
In September, Amami, Japan, experiences a notable shift in humidity, settling at 81%, slightly lower than the peak levels of the summer months but still indicative of the region's lush tropical climate. This subtle decline from the summer's average of 84% signals the transition into autumn, following a pattern observed throughout the year where humidity generally escalates from the cooler winter months to the hot summer. While September’s humidity remains high, it is part of a gradual decrease as the year moves into the drier months, with October expected to bring a further drop to 79%. This cyclical humidity trend not only shapes the island's verdant landscapes but also influences the local lifestyle, allowing for a brief respite before the wet season recycles later in the year.
In September, Amami, Japan experiences a UV Index of 12, placing it firmly in the extreme exposure category with a burn time of just 10 minutes. This month continues the trend of high UV exposure seen from June to August, where the index peaked at 13. Although there's a slight decrease in the UV Index this month, it remains critically high, making sun safety a priority for residents and visitors alike. As summer transitions into fall, it's essential to stay vigilant about sun protection during outdoor activities. For more detailed insights on UV levels throughout the year, visit Amami UV Index.
UV Risk Categories
As summer fades into early autumn, September in Amami, Japan, continues to bask in abundant sunshine, boasting an impressive 286 hours of sunlight. This reflects a slight decline from the peak summer months of July and August, where the sun graced the island for 310 and 323 hours respectively. However, September still outshines the earlier months of the year, showcasing a vibrant transition as daylight gradually diminishes in the coming months. The trend of increasing sunshine from January's mere 144 hours to the late summer highs enhances the allure of September, inviting both locals and travelers to embrace the lingering warmth and stunning natural beauty of Amami before the cooler days of October set in.
September in Amami, Japan, marks a significant turning point in the weather, boasting a promising 50% chance of sunny days—the highest of the year. This increase is particularly noteworthy compared to the preceding summer months, where the likelihood of sunshine dipped as low as 12% in June. As the summer heat wanes, residents and visitors alike can expect the skies to clear, offering delightful opportunities to enjoy the island's lush scenery. With the sunshine potential nearly equal to that of October at 48%, September stands out as the perfect month to experience Amami’s natural beauty under brighter skies.
As summer gives way to autumn in Amami, Japan, September marks a gentle transition in daylight duration, providing around 12 hours of sunshine each day. This slight decrease from the peak of 13 hours experienced during the summer months signals the gradual approach of shorter days. Interestingly, September maintains a balance between the long, bright days of summer and the forthcoming shorter daylight hours of October, which will drop to 11 hours. This seasonal ebb and flow reflects the natural rhythm of Amami's climate, inviting residents and visitors alike to savor the lingering warmth and vibrant colors of early autumn while they can.
As September rolls into Amami, Japan, the island experiences a gentle shift in its weather patterns, marked by the average wind speed dropping to 4.8 m/s (11 mph). This transition reflects a notable decline from the breezy summer months, where winds typically range from 5.9 to 7.0 m/s. Following the lively gusts of July and August, September's softer breezes hint at the gradual approach of autumn. Interestingly, this month stands out as the calmest of the year, creating a peaceful atmosphere ideal for enjoying the island's stunning natural landscapes. Soon, however, the winds will pick up again—October ushers in a return to stronger breezes, averaging 7.1 m/s, signaling the start of a more dynamic season ahead.
Weather in Amami varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Amami, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January exhibit contrasting weather patterns. In September, temperatures range from a warm minimum of 24°C (75°F) to a high of 30°C (87°F), with an average of 27°C (82°F). The month is also characterized by significant rainfall, totaling 223 mm (8.8 in) across 20 days, and high humidity at 81%. In stark contrast, January experiences much cooler temperatures, with a minimum of 10°C (50°F), an average of 16°C (61°F), and a maximum of 22°C (72°F). Precipitation is notably lower, with 98 mm (3.9 in) over just 12 days and humidity levels dropping to 72%. For more details, you can visit Amami weather in January.
The weather in September is characterized by warmer temperatures, with averages around 27°C (82°F) and highs reaching up to 30°C (87°F). In contrast, February experiences much cooler conditions, with average temperatures of 16°C (61°F) and maximums of 23°C (73°F). Additionally, September sees significantly more rainfall, with 223 mm (8.8 in) spread over 20 days, while February has less precipitation at 114 mm (4.5 in) over just 14 days. Humidity levels also differ, as September has a higher average at 81% compared to February's 70%. For more details about the weather in February, visit Amami weather in February.
September and March present contrasting weather conditions in terms of temperature and precipitation. In September, temperatures are notably warmer, with a minimum of 24°C (75°F) and an average of 27°C (82°F), peaking at 30°C (87°F). However, this month also sees significant rainfall, with 223 mm (8.8 in) spread over 20 days and high humidity at 81%. In contrast, March offers a cooler climate, with a minimum temperature of 13°C (55°F), an average of 18°C (65°F), and a maximum of 23°C (73°F). Precipitation decreases in March to 159 mm (6.3 in), occurring over 15 days, along with slightly lower humidity at 76%. To learn more about the weather specifics during March, check out Amami weather in March.
September and April showcase markedly different weather patterns. In September, temperatures are generally warmer, with averages around 27°C (82°F) and maxing out at 30°C (87°F), while April experiences a much cooler average of 20°C (68°F) with highs reaching just 25°C (78°F). Additionally, September brings significantly more rainfall, with 223 mm (8.8 in) over roughly 20 days, compared to April's 121 mm (4.8 in) spread over 12 days. Despite having similar humidity levels, with September at 81% and April at 82%, the overall feel is quite different. For a more detailed look at the April weather, you can visit Amami weather in April.
September weather is generally warmer than May, with average temperatures reaching 27°C (82°F) compared to May's 23°C (73°F). The peak temperatures in September can soar up to 30°C (87°F), while May tops out at 27°C (80°F). However, September experiences slightly more precipitation, with 223 mm (8.8 in) over 20 days, whereas May sees 213 mm (8.4 in) across 16 days. The humidity levels are comparable, with September at 81% and May at 84%. For more detailed information, you can check Amami weather in May.
In comparing the weather of September and June, September typically showcases slightly warmer temperatures, with an average of 27°C (82°F) compared to June's 25°C (78°F). However, June experiences significantly higher precipitation, totaling 433 mm (17.0 in) over 20 days, while September has 223 mm (8.8 in) during the same number of days. Additionally, the humidity is marginally higher in June at 87% compared to September's 81%. For more details about June weather specifically, you can refer to Amami weather in June.
In comparing the weather patterns of September and July, both months exhibit warm temperatures, with July slightly edging out with an average of 28°C (82°F) compared to September's 27°C (82°F). While the minimum temperatures remain consistent at around 24°C (75°F), July tends to have a marginally higher maximum temperature of 31°C (87°F) versus September's 30°C (87°F). Rainfall is more pronounced in September, accumulating to 223 mm (8.8 in) over 20 days, whereas July experiences less rain, totaling 185 mm (7.3 in) over only 13 days. Additionally, humidity is notably higher in July at 89%, compared to 81% in September. For more detailed information, you can check Amami weather in July.
In comparing the weather of September and August, September exhibits slightly lower temperatures, with averages of 27°C (82°F) compared to August's 28°C (83°F). Despite this, August boasts a higher maximum temperature of 31°C (87°F), while September peaks at 30°C (87°F). The humidity levels remain quite similar, with August at 84% and September at 81%. Rainfall is significantly more prevalent in September, accumulating 223 mm (8.8 in) over 20 days, compared to 193 mm (7.6 in) over 14 days in August. For a detailed look at the weather in August, you can check Amami weather in August.
In September, the weather is generally warmer with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 30°C (87°F) and an average temperature of 27°C (82°F). The month also sees significant rainfall, with 223 mm (8.8 in) of precipitation over 20 days, contributing to a relatively high humidity level of 81%.
In contrast, October experiences slightly cooler temperatures, with a minimum of 20°C (68°F), an average of 25°C (77°F), and a maximum of 28°C (83°F). Precipitation decreases to 151 mm (5.9 in) over 14 days, and humidity remains relatively stable at 79%. For more detailed information, you can visit Amami weather in October.
September and November present contrasting weather conditions. In September, temperatures are notably warmer, with a minimum of 24°C (75°F) and an average high of 30°C (87°F), while humidity levels remain high at 81%. The month experiences significant rainfall, accumulating 223 mm (8.8 in) over 20 days. In contrast, November ushers in cooler temperatures, with a minimum of 16°C (62°F) and an average maximum of 26°C (78°F). Precipitation is also reduced, totaling 121 mm (4.8 in) over just 12 days, accompanied by slightly lower humidity at 77%. For a more detailed look at November weather, you can check Amami weather in November.
September weather is characterized by warm temperatures, with a minimum of 24°C (75°F) and an average of 27°C (82°F), peaking at around 30°C (87°F). The month sees considerable precipitation, totaling 223 mm (8.8 in) spread over 20 days, contributing to a high humidity level of 81%.
In contrast, December brings a significant drop in temperatures, with a minimum of 12°C (55°F) and an average of 18°C (65°F), reaching a maximum of 25°C (77°F). The precipitation levels are also lower, at 125 mm (4.9 in) over 16 days, and humidity decreases slightly to 74%. For more detailed information on December weather, you can visit Amami weather in December.
September in Amami heralds a transition as the warm summer days gradually give way to the breezier autumn months. With the average temperature hovering around a comfortable 27°C (82°F), it provides a pleasant retreat from the heat of July and August, where peaks can soar higher. However, this month is also characterized by a notable increase in precipitation, with frequent rainy days that enhance the lush greenery of the landscape. The high humidity—averaging 81%—can add a bit of stickiness to the air, contrasting sharply with the drier conditions of later fall. For those seeking a deeper dive into Amami's climate throughout the year, visit Amami Climate for more insights.