Last updated: August 21, 2025
In Aizu-Wakamatsu, Japan, the weather in September presents a delightful blend of warm and mild conditions. With a maximum temperature soaring to 31°C (89°F) and an average of 20°C (67°F), this month encourages outdoor exploration amidst the beauty of autumn's onset. However, temperatures can dip to a cool 9°C (48°F) during the night, reminding visitors to prepare for a range of climates. Precipitation is quite significant, averaging 120 mm (4.7 in) over 14 days of rain, accompanied by high humidity levels of 89%. This dynamic weather pattern contributes to the vibrant natural scenery, making September a uniquely captivating time to experience Aizu-Wakamatsu.
In September, Aizu-Wakamatsu begins to transition from the intense heat of summer to the cooler embrace of autumn. The minimum temperature settles at 9°C (48°F), providing a refreshing reprieve from the sweltering August highs of 34°C (94°F). With an average temperature of 20°C (67°F), this month balances warmth and coolness, making it a delightful time to explore the area, especially as the leaves start to hint at their vibrant fall colors. The maximum temperature reaches a comfortable 31°C (89°F), reminding us of the lingering summer vibes but with a subtle shift towards the cozy days ahead. Overall, September in Aizu-Wakamatsu invites both locals and visitors to enjoy the moderate climate as nature displays its transition into autumn.
September in Aizu-Wakamatsu brings a notable 120 mm (4.7 in) of precipitation, making it one of the wetter months alongside March and July. With 14 days of rainfall, the month marks a shift as summer’s abundant showers transition into the drier fall season. Interestingly, this period mirrors a substantial drop from the peak July rainfall of 239 mm (9.4 in), highlighting the region's tendency toward intense summer precipitation followed by a gradual decrease. As August recedes, July's remnants linger in September, but the gradual tapering paves the way for the crisp autumn air, where the scenery transforms under the influence of the upcoming fall weather patterns.
As September approaches in Aizu-Wakamatsu, Japan, the humidity begins to transition from the sweltering summer months. After two months of high humidity peaking at 92% in both July and August, September offers some relief with a notable dip to 89%. This shift marks a gradual decrease that heralds the onset of fall while still retaining a hint of summer's lingering warmth. Following September, the humidity continues to decline, settling at 87% in October, suggesting a steady trend towards drier air as the season progresses. Overall, the fluctuating humidity levels throughout the year reflect a rich tapestry of seasonal changes, culminating in a slightly more comfortable atmosphere as autumn sets in.
As summer transitions into autumn, September in Aizu-Wakamatsu experiences a notable shift in its UV Index, dropping to 9, which corresponds to the very high exposure category. With a burn time of just 15 minutes, this month serves as a reminder to remain vigilant about sun protection, following the peak summer months of extreme conditions where the UV Index reached 11. Interestingly, while the intensity decreases slightly in September, it still necessitates caution, carrying forward the trend from earlier months that underscores the importance of sun safety as the seasons change. As you plan your outdoor activities, stay informed and check the latest updates at Aizu-Wakamatsu UV Index to ensure your sun exposure is managed effectively.
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September in Aizu-Wakamatsu brings a gentle transition as the summer sun begins to wane, offering a pleasant 228 hours of sunshine. This marks a slight decrease from the sun-drenched August, which recorded a vibrant 271 hours. The month fits snugly within a year that begins with a modest start in January at 145 hours, gradually ramping up to a peak in May with 281 hours of warm, illuminating rays. Following September, October sees another dip to 193 hours, indicating the approach of autumn and the settling of shorter days. This trend highlights a rhythmic ebb and flow of sunshine throughout the year, painting Aizu-Wakamatsu in shades of brightness before the cooler months take hold.
September in Aizu-Wakamatsu, Japan, offers a moderate chance of sunny weather, with 23% likelihood of sunshine. This positions September similarly to the summer months of July and August, which also see 23% and 22% chances respectively. While not the sunniest time of the year, the transition into autumn brings a slight uptick compared to the spring month of May, which has a 25% chance. As the year progresses into October, the chance of sunny days increases slightly to 27%, indicating that while September may not boast abundant sunshine, it lays the groundwork for a more varied weather landscape in the months ahead.
As summer gives way to autumn in Aizu-Wakamatsu, Japan, September sees a gentle decline in daylight duration, offering approximately 12 hours of daylight. This trend of decreasing day length begins after the peak of 14 hours found in June and July, reflecting the gradual transition from the long, bright days of summer to the shorter ones typical of fall. Following September, the daylight continues to wane, dropping to 11 hours in October and further to 10 hours in November, ultimately returning to 9 hours by December. This rhythmic ebb and flow of daylight throughout the year not only marks the changing seasons but also infuses the landscape with the rich colors and serene beauty characteristic of autumn.
In Aizu-Wakamatsu, September brings gentle breezes, with an average wind speed of 1.9 m/s (4 mph), maintaining the light, serene feel of the summer months. This slight lull in wind—from the more invigorating speeds seen earlier in the year—highlights a seasonal transition, where the vibrant activity of summer begins to soften. Notably, this month's conditions mirror August's winds, signaling a period of mildness before the autumn chill sets in. As the year progresses, wind speeds gradually creep upwards again, hinting at the bold gusts of winter that lie ahead, yet for now, September offers a moment of calm before the seasonal shift.
Weather in Aizu-Wakamatsu varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Aizu-Wakamatsu, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January showcase stark contrasts in weather. In September, temperatures range from a mild 9°C (48°F) to a warm 31°C (89°F), with an average of 20°C (67°F). The month experiences significant rainfall, totaling 120 mm (4.7 in) over 14 days, and high humidity at 89%. In contrast, January brings a much colder climate, with temperatures dipping as low as -11°C (12°F) and peaking at only 8°C (47°F), leading to an average of -1°C (31°F). Although January has slightly less precipitation at 96 mm (3.8 in), it spans over 18 days, and maintains a humidity level of 88%. For more details, visit Aizu-Wakamatsu weather in January.
September weather is characterized by warm temperatures, ranging from a minimum of 9°C (48°F) to a maximum of 31°C (89°F), with an average of 20°C (67°F). It experiences significant precipitation, with 120 mm (4.7 in) falling over 14 days, combined with high humidity at 89%. In contrast, February presents a much colder climate, featuring temperatures that range from a frigid minimum of -11°C (13°F) to a maximum of 15°C (59°F), with an average temperature of 0°C (32°F). This month sees less precipitation at 90 mm (3.5 in) across 19 days and slightly lower humidity at 86%. For more detailed information on February weather, refer to Aizu-Wakamatsu weather in February.
The weather in September and March presents a striking contrast in Aizu-Wakamatsu. In September, the temperatures typically range from a minimum of 9°C (48°F) to a maximum of 31°C (89°F), creating a warm atmosphere with an average of 20°C (67°F). Despite its warmth, September experiences considerable precipitation, totaling 120 mm (4.7 inches) over about 14 days, with high humidity levels around 89%. Conversely, March brings much colder conditions, with temperatures fluctuating between a chilly minimum of -9°C (16°F) and a maximum of 19°C (67°F), averaging just 4°C (39°F). The month also sees similar rainfall totals of 120 mm (4.7 inches) spread over approximately 15 days, but with lower humidity at 81%. For a detailed look at March weather in Aizu-Wakamatsu, you can visit Aizu-Wakamatsu weather in March.
September and April present contrasting weather patterns, highlighting the shift from summer to autumn and winter to spring. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 31°C (89°F), with an average of 20°C (67°F), making it notably warmer than April, which has a minimum of -3°C (26°F) and a maximum of 26°C (79°F). While September experiences relatively high humidity at 89% and significant precipitation of 120 mm (4.7 in) over 14 days, April is slightly drier with 105 mm (4.1 in) over 13 days and lower humidity at 78%. For further details on April weather in Aizu-Wakamatsu, you can visit this link: Aizu-Wakamatsu weather in April.
When comparing the weather in September and May, several notable differences emerge. September tends to be warmer overall, with average temperatures around 20°C (67°F), compared to May's average of 15°C (59°F). Both months can reach a maximum of 31°C (89°F), but September features a significantly higher minimum temperature of 9°C (48°F) versus May's cooler 2°C (36°F). September is also considerably more humid at 89%, while May's humidity is slightly lower at 81%. Additionally, September sees more precipitation, with 120 mm (4.7 in) across 14 days, compared to May's 99 mm (3.9 in) over 12 days. For more detailed weather information about May, visit Aizu-Wakamatsu weather in May.
In comparing the weather between September and June, September typically experiences a broader temperature range, with minimums around 9°C (48°F) and maximums reaching 31°C (89°F). In contrast, June has slightly cooler minimum temperatures at 7°C (45°F) and similar maximums peaking at 32°C (90°F). Both months see substantial rainfall, with September receiving about 120 mm (4.7 in) over 14 days, while June has a bit less at 101 mm (4.0 in) over 12 days. Humidity levels are comparable, with September at 89% and June slightly lower at 88%. For a more detailed look at June weather, you can visit Aizu-Wakamatsu weather in June.
In comparing the weather of September and July, we observe notable differences in temperature and precipitation. September experiences a more moderate temperature range with minimums of 9°C (48°F) and maximums reaching 31°C (89°F), averaging at 20°C (67°F). In contrast, July is generally warmer, with minimum temperatures at 14°C (58°F) and maximums peaking at 34°C (93°F), averaging around 23°C (73°F). Precipitation is also significantly higher in July, totaling 239 mm (9.4 in) over 19 days, compared to September's 120 mm (4.7 in) over 14 days. Both months experience high humidity, with July slightly higher at 92% compared to September's 89%. For more details, check Aizu-Wakamatsu weather in July.
In August, the weather is characterized by warmer temperatures, with a minimum of 14°C (57°F) and an average of 24°C (76°F), peaking at a maximum of 34°C (94°F). This month also sees slightly higher precipitation, totaling 136 mm (5.3 in) over 16 days, coupled with a humidity level of 92%. In comparison, September experiences cooler conditions, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 31°C (89°F), and an average of 20°C (67°F). The precipitation in September is somewhat less, at 120 mm (4.7 in) over 14 days, but the humidity remains relatively high at 89%. For a detailed look at the weather patterns, you can check Aizu-Wakamatsu weather in August.
September and October showcase a transition in weather patterns, with September featuring a wider temperature range, from a minimum of 9°C (48°F) to a maximum of 31°C (89°F) and an average of 20°C (67°F). In contrast, October sees cooler temperatures, with a minimum of 2°C (37°F), an average of 14°C (57°F), and a maximum of 27°C (80°F). While September is characterized by higher humidity at 89% and significant precipitation of 120 mm (4.7 in) over 14 days, October has slightly lower humidity at 87% but records even more rainfall at 168 mm (6.6 in) over 12 days. For more detailed information, check out Aizu-Wakamatsu weather in October.
In September, the weather is significantly warmer with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 31°C (89°F), and an average of 20°C (67°F). This month is characterized by high humidity at 89% and notable precipitation, totaling 120 mm (4.7 in) over 14 days. In contrast, November experiences much cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 20°C (68°F), leading to an average of only 8°C (46°F). The precipitation is lower at 60 mm (2.3 in) across 11 days, and humidity drops slightly to 85%. This shift from the warm, humid September to the chillier, drier November marks a clear transition into winter. For more details on November weather, you can refer to Aizu-Wakamatsu weather in November.
September and December exhibit strikingly different weather patterns. In September, temperatures range from a mild 9°C (48°F) to a warm 31°C (89°F), with an average of 20°C (67°F). The month experiences significant rainfall, with around 120 mm (4.7 in) falling over 14 days and humidity peaking at 89%. In contrast, December marks a dramatic drop in temperature, with lows reaching -10°C (15°F) and an average of just 2°C (36°F). Although precipitation is slightly less at 110 mm (4.3 in), it occurs over more days—20 in total—while humidity remains relatively high at 86%. For more detailed information on December weather, visit Aizu-Wakamatsu weather in December.
As September unfolds in Aizu-Wakamatsu, the weather showcases a delightful transition from the sultry summer heat to the refreshing embrace of autumn. With warm days still gracing the region, the average temperature invites outdoor exploration, yet the nights begin to cool, offering a pleasant respite. This month also brings increased rainfall, with a notable uptick in precipitation days, adding a lush vibrancy to the landscape. Coupled with high humidity, September’s weather stands in contrast to the dry spells of summer and the crisp clarity of the upcoming fall. For a deeper understanding of yearly trends and variations, be sure to check out Aizu-Wakamatsu Climate.