Last updated: August 21, 2025
In September, Fuji, Japan experiences a vibrant blend of weather characteristics that highlight the transition from summer to autumn. The maximum temperature can soar to 32°C (90°F), while the average hovers around a comfortable 21°C (71°F). As the nights cool down, temperatures can dip to a refreshing 12°C (54°F). The month is marked by significant precipitation, accumulating to 254 mm (10.0 in) over 20 days, contributing to a notably high humidity level of 86%. This dynamic climatic profile makes for lush landscapes and a unique atmosphere, perfect for exploring the natural beauty surrounding Mount Fuji.
In September, Fuji, Japan, begins to transition from the sweltering summer heat to more temperate autumn conditions. With minimum temperatures around 12°C (54°F) and average highs soaring to 32°C (90°F), the month strikes a delightful balance between warm days and cooler nights. The average temperature reaches 21°C (71°F), making it an ideal time for outdoor activities amidst the stunning fall foliage. As summer's grip loosens, residents and visitors alike can enjoy pleasantly warm days, with the promise of crisp autumn air just around the corner. This shift in weather not only marks a change in temperature but also sets the stage for the breathtaking beauty that Fuji is renowned for in the coming months.
September in Fuji, Japan, marks the transition into the autumn season, characterized by a significant precipitation amount of 254 mm (10.0 in), making it one of the wetter months of the year alongside the summer. With 20 days of rainfall, the month maintains a high frequency of precipitation, echoing the trend seen in the preceding months. This consistent rainfall contributes to the lush greenery surrounding Mount Fuji, enhancing its majestic beauty. Interestingly, September's rainfall is only slightly less than the deluges of July and August, which recorded 404 mm (15.9 in) and 252 mm (9.9 in), respectively. As the year progresses, the increase in precipitation peaks again in October, suggesting a pattern of heavy rains that precede the dry winter months.
In September, Fuji, Japan, experiences a notable humidity level of 86%, marking a slight decrease from the peak summer months. As the warm weather transitions into autumn, the humidity begins to taper off from the sweltering highs of 93% in July and 90% in August. This pattern highlights a general trend of increasing humidity from early spring to late summer, peaking in July. As the year progresses into fall, September serves as a reminder that while the heat lingers, the high humidity levels are beginning to settle, setting the stage for the cooler and more comfortable months ahead. Overall, the fluctuating humidity levels play a significant role in shaping the vibrant landscape and climate of Fuji throughout the year.
In September, the UV Index in Fuji, Japan reaches a significant level of 10, classifying it in the very high exposure category, with a burn time of just 15 minutes. This month marks a slight decrease from the peak UV levels experienced during the summer, where the index soared to 12 in July. Despite this drop, September remains a month to exercise caution, as sun protection is crucial to avoid overexposure. As autumn approaches, the UV levels begin to taper off, transitioning into the high category in October, but for now, ensuring skin safety is essential. To learn more about the UV Index throughout the year, visit Fuji UV Index.
UV Risk Categories
As summer fades into early autumn, September in Fuji, Japan, enjoys a whopping 236 hours of sunshine. This sets it apart as a noteworthy month following the sun-soaked peak of August, which boasts the highest sunshine at 285 hours. While the days gradually shorten, September still shines brighter than several earlier months, including June and July, both of which hover around the 230-hour mark. This continuity of sunshine ensures that the vibrant surroundings of Mount Fuji maintain their breathtaking allure, inviting visitors to experience the stunning scenery as nature transitions into the tranquil embrace of fall.
In September, the likelihood of sunny weather in Fuji, Japan holds steady at 26%, mirroring the slightly low chances observed in the preceding summer months of July and August. This marks a notable decline from the sunnier months early in the year, where the chance of sunshine exceeds 50% in both January and February. Following September, the odds improve again in October, reaching 39%, hinting at a gradual shift toward brighter days as autumn unfolds. While September might not be the sunniest, it offers a delightful blend of warm weather and vibrant surroundings, making it a unique time to experience the beauty of Fuji.
As September settles in Fuji, Japan, a noticeable transition occurs in daylight duration. With about 12 hours of sunshine, September marks a subtle shift from the peak summer days of July and August, each boasting a robust 14 hours of daylight. This gradual decline sets the stage for the coming autumn, as daylight begins to taper off towards the 11 hours in October. The trend highlights a consistent pattern, where longer daylight hours dominate the spring and summer months, while the shorter autumn and winter months follow suit. Embracing September's moderate daylight offers a beautiful balance, capturing the last remnants of summer's warmth before yielding to the crisp embrace of autumn.
As September arrives in Fuji, Japan, the gentle winds begin to weave a soft melody through the landscape, reflecting an average wind speed of 1.7 m/s (4 mph). While this is a slight dip from the summer months, it continues the trend of a relatively calm atmosphere that characterizes the late summer and early autumn. June and July recorded the lowest wind speeds of the year, with 1.5 m/s and 1.4 m/s respectively, signaling a shift towards the cooler months. The consistent breeze through September not only provides a refreshing reprieve from the heat but also hints at the approaching autumn, as the wind speeds remain stable compared to earlier months. Overall, the transition into fall in Fuji is marked by gentle winds that enhance the tranquil beauty of the region, allowing nature's colors to shine through as the leaves begin to turn.
Weather in Fuji varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Fuji, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present stark contrasts in weather. September enjoys a mild average temperature of 21°C (71°F), with highs reaching up to 32°C (90°F), while January sees much colder conditions, with an average of 4°C (39°F) and highs only around 17°C (62°F). Rainfall in September is significantly higher, totaling 254 mm (10.0 in) over 20 days, compared to January's 72 mm (2.8 in) over just 9 days. Additionally, humidity levels are elevated in September at 86%, while January experiences a more moderate 76%. For more detailed insights into January weather, you can refer to Fuji weather in January.
September and February offer starkly contrasting weather experiences. In September, temperatures range from a mild 12°C (54°F) at night to a hot 32°C (90°F) during the day, accompanied by high humidity at 86% and significant rainfall of 254 mm (10.0 in) over about 20 days. In contrast, February presents a chilly climate, with nighttime lows dipping to -5°C (24°F) and daytime highs reaching only 19°C (66°F). This cooler month experiences significantly less rain, totaling 96 mm (3.8 in) over about 12 days, and a lower humidity of 74%. For more detailed information, you can visit Fuji weather in February.
September and March present contrasting weather patterns. In September, temperatures range from a minimum of 12°C (54°F) to a maximum of 32°C (90°F), with an average of 21°C (71°F). The month is characterized by high humidity levels of 86% and substantial precipitation, totaling 254 mm (10.0 in) over 20 days. In contrast, March experiences much cooler temperatures, with a minimum of -5°C (24°F) and a maximum of 22°C (72°F), averaging around 8°C (47°F). This month sees slightly lower precipitation at 222 mm (8.8 in) over 15 days and a lower humidity of 70%. For more detailed weather insights in March, you can refer to Fuji weather in March.
When comparing the weather in September and April, we observe notable differences in temperature and humidity. September tends to be warmer, with average temperatures reaching 21°C (71°F) and highs of up to 32°C (90°F), while April's average is a cooler 12°C (54°F) and peaks at 25°C (78°F). In terms of precipitation, September experiences more rain, with 254 mm (10.0 in) falling over 20 days, compared to April's 210 mm (8.3 in) over 16 days. Additionally, humidity is higher in September at 86%, compared to April's 74%. These factors contribute to a distinct variation in the overall weather experience during these months. For more details about April weather specifics, you can check Fuji weather in April.
In September, the weather tends to be warmer and more humid compared to May. With average temperatures hovering around 21°C (71°F) and highs reaching up to 32°C (90°F), September experiences a significant temperature range. In contrast, May has a milder average of 17°C (62°F) and maximum temperatures of 28°C (83°F). Both months see considerable rainfall, but September receives more, totaling 254 mm (10.0 in) over 20 days, while May has 201 mm (7.9 in) falling over 14 days. Humidity is also slightly higher in September at 86%, compared to 81% in May. For a detailed look at the weather in May, you can visit Fuji weather in May.
In comparing the weather of September and June, both months exhibit mild temperatures, but September tends to be slightly warmer. September sees average highs reaching up to 32°C (90°F) compared to June's maximum of 29°C (84°F). The minimum temperatures are comparable, sitting at 12°C (54°F) for September and 12°C (53°F) for June. Precipitation is quite similar in both months, with September recording 254 mm (10.0 in) over 20 days, while June has 247 mm (9.7 in) over 18 days. Humidity levels are also relatively high, with September at 86% and June at 88%. For more detailed insights, you can check Fuji weather in June.
When comparing the weather in September to July, several key differences emerge. September experiences a milder temperature range, with minimums around 12°C (54°F) and maximums peaking at 32°C (90°F), while July is warmer, with minimums of 17°C (62°F) and a maximum temperature of 33°C (91°F). Additionally, September has slightly less precipitation at 254 mm (10.0 in) over 20 days, compared to July's significantly higher 404 mm (15.9 in) over 21 days. The humidity also shows a marginal decrease in September, averaging 86% compared to July's higher 93%. For more detailed insights into July weather, you can check Fuji weather in July.
In comparison to August, September experiences slightly cooler temperatures, with minimums averaging 12°C (54°F) compared to 16°C (62°F) in August. While September has an average temperature of 21°C (71°F), August's average is notably warmer at 25°C (78°F), reaching higher maximums of 32°C (90°F) in September versus 34°C (94°F) in August. Interestingly, both months receive a similar amount of precipitation, approximately 254 mm (10.0 in) in September and 252 mm (9.9 in) in August, with rain occurring on about 20 days in each month. However, September's humidity is slightly lower at 86%, whereas August tends to be more humid at 90%. For more details about the weather specifically in August, you can check Fuji weather in August.
September weather is characterized by warmer temperatures, with a minimum of 12°C (54°F) and an average of 21°C (71°F), peaking at a maximum of 32°C (90°F). However, it also sees significant rainfall, recording 254 mm (10.0 in) over 20 days and an average humidity of 86%. In contrast, October brings cooler conditions, with a minimum of 7°C (44°F), an average of 16°C (62°F), and a maximum of 29°C (85°F). Although the temperatures drop, October experiences even higher precipitation, totaling 355 mm (14.0 in) over 19 days, with humidity remaining slightly lower at 83%. For more detailed information, check Fuji weather in October.
In September, the weather is warm and humid, with average temperatures ranging from a mild 12°C (54°F) at night to a scorching 32°C (90°F) during the day. This month sees considerable rainfall, totaling 254 mm (10.0 in) over 20 days, contributing to the elevated humidity of 86%. In contrast, November brings a significant drop in temperatures, with averages between 1°C (34°F) at night and a maximum of 21°C (71°F) during the day. Precipitation decreases to 102 mm (4.0 in) over just 13 days, and humidity also sees a slight decline at 80%. For more detailed information about the conditions in November, you can check this link: Fuji weather in November.
September and December present a stark contrast in weather conditions. In September, temperatures range from a mild 12°C (54°F) to a warm 32°C (90°F), with an average of 21°C (71°F). The month is characterized by high humidity at 86% and significant rainfall, accumulating to 254 mm (10.0 in) over 20 days. In contrast, December brings a chillier climate, with temperatures dipping between -3°C (27°F) and a maximum of 20°C (67°F), averaging just 6°C (43°F). Precipitation also decreases significantly to 88 mm (3.5 in) over 11 days, and humidity drops to 78%. For those seeking more details about December weather, you can check Fuji weather in December.
As September unfolds in Fuji, the weather shifts noticeably from the hot summer months, providing a refreshing change with cooler temperatures and increased humidity. While the average temperature hovers around a comfortable 21°C, the occasional peaks can still reach a warm 32°C. However, the significant precipitation—with over half the month experiencing rain—can bring a lush vibrancy to the landscape, making it unique compared to the drier summer. With 86% humidity, September marks a transition to a more temperate climate, preparing the region for the beautiful autumn hues to come. For a deeper dive into what to expect throughout the year, explore the Fuji Climate.