Last updated: August 21, 2025
Experience the captivating September weather in Rishiri Town, Japan, where nature transitions gracefully into autumn. With maximum temperatures reaching around 25°C (77°F) and an average of 18°C (65°F), the climate is pleasantly mild, perfect for outdoor adventures. Nights cool down to a comfortable 12°C (53°F), inviting cozy evenings. However, visitors should be prepared for some rain, as precipitation amounts hit 92 mm (3.6 in) over 10 days, contributing to the lush scenery. The high humidity level at 86% gives the air a refreshing quality, enhancing the beauty of this scenic locale. Enjoy the tranquil charm of Rishiri Town this September!
In September, Rishiri Town, Japan, experiences a delightful transition as summer gracefully fades into autumn. Temperatures during this month range from a mild 12°C (53°F) at night to a pleasant 25°C (77°F) during the day, with an average of 18°C (65°F). This warming trend continues from the preceding months, highlighting the lingering warmth of late summer. As the air cools slightly, it offers a perfect backdrop for enjoying the stunning landscapes and vibrant foliage that characterize this time of year. With September's comfortable climate, Rishiri invites visitors to relish outdoor activities before winter settles in, making it a truly enchanting month for exploring this picturesque region.
In September, Rishiri Town experiences a moderate level of precipitation, recording 92 mm (3.6 in) over approximately 10 days. This marks a slight decrease from the heavier rainfall of August, which sees an impressive 148 mm (5.8 in) during 13 days. As summer transitions to autumn, the September weather sets the stage for a balance between moisture and sunshine, hinting at the wetter months to come. Notably, this month acts as a bridge, with rainfall quantities gradually increasing in the following months, reaching heights of 136 mm (5.4 in) in October and surging further to 172 mm (6.8 in) by November. The pattern demonstrates Rishiri Town's shift towards a more humid climate as the year progresses, with September serving as an essential transitional period in its precipitation cycle.
In September, Rishiri Town experiences a notable shift in its humidity levels, with an average of 86%. This marks a slight decrease from the peak months of July and August, when humidity soared to 93% and 94%, respectively. The high humidity during the summer months transitions into early autumn, contributing to a lingering dampness in the air. However, compared to earlier months, like January through April, where averages hover between 83% and 88%, September still retains a noticeable humidity that sets the stage for cooler October temperatures. Overall, this month provides a bridge between the intense summer humidity and the more comfortable fall conditions that follow.
In September, Rishiri Town experiences a UV Index of 7, placing it in the high exposure category with a recommended burn time of 25 minutes. This marks a slight decrease from the peak months of summer, where the UV Index reached a high of 9 from June to August, indicating very high exposure risk. As autumn approaches, the UV Index in September reflects a gradual transition to milder conditions, yet caution is still advised for outdoor activities. This trend illustrates the significant fluctuations in UV radiation throughout the year, emphasizing the importance of sun protection as the season shifts. For more detailed insights, visit Rishiri Town UV Index.
UV Risk Categories
In Rishiri Town, September offers a delightful continuation of the summer's warmth, with 283 hours of sunshine that invites both relaxation and exploration. As summer bids farewell, the sunshine hours gradually taper off from the peak of July, which boasts an impressive 325 hours of bright skies. Throughout the months leading up to September, the town experiences a steady increase in sunlight, peaking in May and July, before the slight dip in late summer and early fall. This pattern illustrates a trend where Rishiri sees its longest days in summer, making September a perfect time to relish the tail end of sunny days and take in the stunning natural beauty before autumn sets in with its cooler temperatures and reduced sunlight.
In September, Rishiri Town, Japan, experiences a notable chance of sunshine, with approximately 46% likelihood of clear skies. This marks a continuation of a trend established throughout the summer months, where July and August also hover around this sunny percentage. As the seasons transition, September remains one of the brighter months, showcasing an increase in sunshine opportunities compared to the spring and early summer. Following this peak, the likelihood of sun begins to wane, dropping to 40% in October and further in the colder months. Overall, September provides a delightful window of pleasant weather, making it a perfect time for outdoor activities amid Rishiri's stunning landscapes.
In Rishiri Town, Japan, September marks a gentle transition in daylight as the days begin to shorten, providing 12 hours of sunlight—a delightful blend of lingering summer warmth and the impending coolness of autumn. Following the peak of 15 hours in both June and July, the gradual decrease continues into October, where daylight slips further to 10 hours. This ebb of light reflects a natural rhythm, as Rishiri Town moves from the long sunny days of summer to the crisper, shorter days of fall, inviting residents and visitors alike to savor the seasonal changes in both scenery and atmosphere.
As summer fades into autumn, September in Rishiri Town witnesses a gentle shift in the wind. The average wind speed drops to 5.4 m/s (12 mph), marking a noticeable decline from the breezier months of June and July, where gusts were at their lightest, averaging around 4.7 m/s (10 mph). This transition reflects a gradual return to the more robust winds characteristic of earlier months, such as January and February, which both average 8.9 m/s (20 mph). The decreased yet steady breeze in September offers a mellow climate, perfect for enjoying the scenic beauty of Rishiri Island as it prepares for the crisp embrace of October.
Weather in Rishiri Town varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rishiri Town, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is notably milder with average temperatures ranging from 12°C (53°F) to a maximum of 25°C (77°F), along with a significant amount of humidity at 86%. The month experiences around 92 mm (3.6 in) of precipitation over approximately 10 days, making it a relatively wet period but still pleasant for outdoor activities. In contrast, January brings much colder conditions, with temperatures plummeting to a minimum of -12°C (10°F) and barely rising above freezing, reaching a maximum of only 5°C (40°F). This month also sees a higher total precipitation of 108 mm (4.3 in), spread across 21 days, and an equally high humidity level of 87%. For more insights into January weather specifically, you can explore the details here: Rishiri Town weather in January.
September and February present starkly contrasting weather conditions. In September, temperatures range from a mild 12°C (53°F) at night to a pleasant 25°C (77°F) during the day, with an average of 18°C (65°F). This month is characterized by relatively high humidity at 86% and considerable rainfall, totaling 92 mm (3.6 in) over about 10 days. In contrast, February brings much colder temperatures, with lows plunging to -14°C (7°F) and maxing out at just 5°C (41°F), averaging -3°C (27°F). This winter month experiences significant precipitation as well, with 103 mm (4.1 in) over 21 days, while humidity sits slightly lower at 84%. For more details about February weather in Rishiri Town, you can refer to Rishiri Town weather in February.
In comparing the weather between September and March, it's clear that both months offer distinct experiences. September boasts a mild climate, with average temperatures ranging from a minimum of 12°C (53°F) to a maximum of 25°C (77°F), accompanied by high humidity at 86%. The month sees around 92 mm (3.6 in) of precipitation over approximately 10 days, making it a relatively wet time of year.
In contrast, March presents a much colder atmosphere, with average temperatures hovering around 1°C (34°F) and daily highs only reaching up to 8°C (46°F). There is a notable chance of precipitation, with about 75 mm (2.9 in) falling over 14 days, while humidity remains low at 83%. The colder conditions in March can be particularly stark when compared to the warm, late summer feel of September. For more detailed information and insights, you can check Rishiri Town weather in March.
When comparing the weather in September and April, a stark contrast emerges. September experiences a milder climate with average temperatures ranging from 12°C (53°F) to 25°C (77°F) and high humidity levels of 86%, making it feel quite warm despite a total precipitation of 92 mm over about 10 days. In contrast, April sees much cooler temperatures, with a range from -2°C (29°F) to a maximum of 11°C (52°F), and lower precipitation of 50 mm over 9 days, accompanied by a slightly lower humidity of 84%. For a detailed look at April weather specifics, you can refer to Rishiri Town weather in April.
September and May present contrasting weather patterns. In September, temperatures range from a minimum of 12°C (53°F) to a maximum of 25°C (77°F), with an average of 18°C (65°F), making it significantly warmer than May, where temperatures only reach a maximum of 17°C (62°F) and an average of 9°C (48°F) with a minimum of 2°C (36°F). September also experiences more rainfall, with 92 mm (3.6 in) over approximately 10 days, compared to May's 78 mm (3.1 in) spread over 11 days. Humidity levels are notably high in both months, with September slightly lower at 86% and May at 88%. For a detailed look at May weather, you can visit Rishiri Town weather in May.
When comparing the weather in September to that of June, noticeable differences emerge. September boasts a milder temperature range, with minimums of 12°C (53°F) and maximums reaching 25°C (77°F), whereas June is cooler, featuring minimums of 6°C (43°F) and maximums at 17°C (63°F). Despite both months receiving similar precipitation levels—September at 92 mm (3.6 in) and June at 88 mm (3.5 in)—the humidity remains relatively high in both months, with September at 86% and June at 88%. For a closer look at June weather specifics in Rishiri Town, refer to Rishiri Town weather in June.
In comparing the weather conditions of September and July, we observe some notable differences. Both months have an average temperature of around 18°C (64°F), but September tends to be slightly warmer with maximum temperatures reaching 25°C (77°F), compared to July's peak of 26°C (78°F). Rainfall is also a factor, as September experiences 92 mm (3.6 in) of precipitation over 10 days, whereas July has slightly higher rainfall at 104 mm (4.1 in) over 8 days. Humidity levels are higher in July at 93%, while September maintains a humidity level of 86%. For those interested in further details about July weather in this region, you can refer to Rishiri Town weather in July.
In comparing the weather data for September and August, we observe that September tends to be slightly cooler, with average temperatures ranging from a minimum of 12°C (53°F) to a maximum of 25°C (77°F), compared to August's temperatures, which range from a minimum of 15°C (60°F) to a maximum of 26°C (79°F). Additionally, September experiences less precipitation at 92 mm (3.6 in) over 10 days, while August is wetter with 148 mm (5.8 in) over 13 days. Humidity levels in September are also lower at 86% compared to the higher 94% in August. For more details on August weather, you can refer to Rishiri Town weather in August.
September and October present a noticeable shift in weather conditions. September typically enjoys milder temperatures, with averages around 18°C (65°F) and highs reaching 25°C (77°F), while October sees cooler averages of 13°C (56°F) and maximums of 19°C (67°F). In terms of rainfall, October is somewhat wetter, accumulating 136 mm (5.4 in) over 16 days, compared to September's 92 mm (3.6 in) over 10 days. Additionally, humidity levels drop slightly from 86% in September to 79% in October, signifying a transition into the cooler autumn months. For more detailed weather insights, you can check out Rishiri Town weather in October.
In September, the weather is generally mild, with temperatures ranging from a minimum of 12°C (53°F) to a maximum of 25°C (77°F) and an average of 18°C (65°F). The month experiences a fair amount of rainfall, totaling 92 mm (3.6 in) over about 10 days, and the humidity remains high at 86%. In contrast, November sees a significant drop in temperatures, which can dip as low as -5°C (22°F) and average around 6°C (42°F), with a maximum of 15°C (59°F). Additionally, November is wetter, boasting 172 mm (6.8 in) of precipitation across approximately 22 days, accompanied by a lower humidity of 77%. For more insights into November weather specifics, you can refer to Rishiri Town weather in November.
September in Rishiri Town offers a mild climate characterized by temperatures ranging from a minimum of 12°C (53°F) to a maximum of 25°C (77°F), with an average of 18°C (65°F). The month experiences about 92 mm (3.6 in) of precipitation over 10 days, resulting in a humid atmosphere with an 86% humidity level. In contrast, December brings a stark change, with temperatures dropping to a minimum of -9°C (16°F) and a maximum of 12°C (55°F), averaging -1°C (31°F). The precipitation increases significantly to 167 mm (6.6 in) over 27 days, paired with a slightly lower humidity of 83%. For more detailed weather information, visit Rishiri Town weather in December.
As September unfolds in Rishiri Town, the weather begins to transition into the brisk embrace of autumn, contrasting sharply with the summer's warmth. With an average temperature hovering around a comfortable 18°C (65°F), the days are still pleasant, yet a noticeable increase in humidity at 86% marks the onset of seasonal shifts. While visitors may find the likelihood of rain with 10 days of precipitation adding a refreshing touch to the lush landscapes, the month’s temperature range sets the stage for cooler evenings. This unique blend of warmth during the day and the crisp chill at night makes September a superb time for experiencing the natural beauty of Rishiri. For a deeper dive into what to expect throughout the year, explore our comprehensive guide on the Rishiri Town Climate.