Last updated: August 21, 2025
September in Ashikaga, Japan, brings a warm and humid climate, with temperatures soaring up to a maximum of 35°C (95°F) and settling around an average of 23°C (74°F). Nighttime offers a mild respite, with minimum temperatures around 13°C (55°F). Rainfall is a noteworthy feature this month, as the city experiences 213 mm (8.4 in) of precipitation over 21 days, contributing to a high humidity level of 89%. Travelers should prepare for a blend of warm days and occasional showers, making September a month of vibrant greenery interspersed with bursts of rain.
September in Ashikaga, Japan, marks a transition into the more temperate months of the year. With temperatures swinging between a minimum of 13°C (55°F) and a maximum of 35°C (95°F), the month tends to present a pleasant warmth, reflected in an average temperature of 23°C (74°F). This gradual cool-down from the sweltering heights of summer, where July and August boast maxes of 37°C (98°F), offers a refreshing reprieve, enticing locals and visitors alike to embrace outdoor activities amidst the lingering warmth. As autumn edges closer, September's comfortable climate sets the stage for vibrant foliage and cooler breezes, making it a delightful time to explore Ashikaga's scenic beauty.
In September, Ashikaga experiences a notable uptick in precipitation, with 213 mm (8.4 in) of rainfall over a 21-day period. This increase marks a continuation of the wetter pattern established in the summer months, particularly following July, which sees the highest rainfall of the year at 274 mm (10.8 in). As autumn approaches, September serves as a transitional month, showcasing both the remnants of summer deluges and the onset of the drier months to come. With precipitation levels remaining high, the landscape is lush and vibrant, captivating those who witness the seasonal shift. The consistent rainfall during this month aligns closely with the trend of July and August, but prepares the region for the significant decrease in precipitation that follows in October and the winter months.
In September, Ashikaga, Japan, experiences a relative humidity of 89%, marking a subtle decline from the 92% levels recorded in the peak summer months of July and August. This slight reduction signals the transition from the hot, humid summer to the more temperate conditions of autumn. Notably, the overall trend through the year showcases the highest humidity during the summer months, hovering around 92%, while the cooler months of winter show a gradual decrease, with January's high of 88% and a steady drop towards 78% in April. As September bridges the end of summer and the onset of fall, residents can expect a blend of lingering warmth and humidity, setting the stage for the crisp air of October.
In September, Ashikaga experiences a UV Index of 9, categorizing it as very high. This signals a continuation of the intense summer sun, with just 15 minutes of exposure potentially leading to skin damage. Following a peak in July and August with an extreme UV Index of 11, September marks a slight decline, yet it still requires vigilance for sun safety. As the month transitions into autumn, the UV Index will further drop in October to 6, moving into the high exposure category. For those looking to plan their outdoor activities, understanding these trends is essential. Stay informed with more details at the Ashikaga UV Index.
UV Risk Categories
In Ashikaga, Japan, the enchanting month of September shines with 224 hours of sunlight, marking a notable decrease from the sun-drenched peak of May and April. As summer gracefully transitions into autumn, the sunlight hours reflect the gentle shift in seasons, following a pattern of vibrant summer months with July and August basking in over 227 and 269 hours respectively. This gradual decline leads into the cooler October, which experiences slightly less sunshine at 207 hours. Overall, September captures the beauty of early autumn, offering a balance of warmth and a hint of the cozy days to come, inviting both locals and visitors to savor its serene sunshine.
In September, Ashikaga experiences a 25% chance of sunny weather, mirroring the patterns seen in the summer months of July and August, which also hover around this lower threshold. This trend highlights a notable decline in sunny days as the region transitions from the warmth of summer into the cooler autumn months. While October shows a slight rebound with a 48% chance of sunshine, September typically yields more overcast skies, suggesting that if you plan to visit during this time, it might be wise to pack an umbrella along with your sunglasses.
In Ashikaga, Japan, the transition into September brings a gentle decrease in daylight hours, offering 12 hours of sunlight each day. This marks a shift from the peak brightness of summer, where the months of June through August bask in their maximum of 14 hours. As the warming days of spring bloom into summer, daylight gradually increases from 9 hours in January to a vibrant 14 hours by July. However, as autumn begins to take its hold, daylight starts to taper down, creating a beautiful balance of light and shadow that characterizes the new season. This gradual transition beautifully reflects the rhythm of nature, inviting residents to savor the changing landscape while enjoying the cozy warmth of daylight that lingers a bit longer into the evenings.
In September, the wind in Ashikaga, Japan, settles into a gentle rhythm, with an average speed of 1.6 m/s (4 mph). This marks a slight decrease from the previous summer months, where breezes characterized by higher speeds gave way to calmer conditions. As the city transitions toward autumn, the overall trend reveals a gradual decline in wind velocity from the spring's breezy peak, peaking at 2.8 m/s in February and winding down to a soft lull in September. This shift adds to the serene ambiance of the season, inviting residents and visitors to enjoy the vibrant autumn leaves without the distraction of strong gusts, creating a perfect backdrop for leisurely walks and reflective moments.
Weather in Ashikaga varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ashikaga, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present strikingly different weather conditions. In September, temperatures range from a mild 13°C (55°F) at night to a scorching 35°C (95°F) during the day, with an average of 23°C (74°F). This month is also characterized by high humidity (89%) and significant rainfall, with 213 mm (8.4 in) of precipitation across 21 days. In contrast, January brings a stark decline in temperatures, with nighttime lows dropping to -9°C (16°F) and daytime highs peaking at 17°C (63°F), yielding an average of just 4°C (39°F). This winter month experiences much less precipitation, totaling only 40 mm (1.6 in) over 5 days, while humidity remains similar at 88%. For a more detailed look at the weather during this chilly month, visit Ashikaga weather in January.
September and February showcase stark contrasts in weather. In September, temperatures vary from a low of 13°C (55°F) to a high of 35°C (95°F), presenting a warm average of 23°C (74°F). The month is characterized by significant rainfall, with 213 mm (8.4 in) spread over 21 days, leading to high humidity levels at 89%. In contrast, February brings much cooler weather, with temperatures ranging from a chilly -5°C (23°F) to a milder 21°C (70°F) and an average of only 5°C (41°F). Precipitation is minimal at 42 mm (1.7 in) across just 6 days, and humidity remains moderately high at 86%. For a more detailed look at February's climate, you can visit Ashikaga weather in February.
September and March present contrasting weather experiences. In September, temperatures range from a mild 13°C (55°F) at night to a sweltering 35°C (95°F) during the day, with an average temperature of 23°C (74°F). The month is also marked by significant precipitation, totaling 213 mm (8.4 in) over 21 days, and high humidity at 89%. In contrast, March brings much cooler temperatures, with nighttime lows of -4°C (26°F) and daytime highs averaging 24°C (75°F). It has a total precipitation of 129 mm (5.1 in) over just 10 days, along with lower humidity levels at 81%. For more information about March weather specifics, you can check Ashikaga weather in March.
September and April present quite contrasting weather profiles. In September, temperatures can soar with a minimum of 13°C (55°F) and an average of 23°C (74°F), reaching highs of up to 35°C (95°F). This month also experiences significant rainfall, with a notable 213 mm (8.4 in) spread over 21 rainy days, accompanied by high humidity at 89%. In stark contrast, April sees much cooler temperatures, starting as low as -1°C (31°F) and averaging around 14°C (57°F), with maximums peaking at 29°C (84°F). Precipitation during this month is less frequent and lighter, totaling 127 mm (5.0 in) over just 12 days, and humidity is comparatively lower at 78%. For more specific details, you can explore Ashikaga weather in April.
When comparing the weather in September and May, notable differences emerge. September tends to be warmer overall, with average temperatures around 23°C (74°F) and maximums reaching up to 35°C (95°F), while May has a cooler average of 19°C (66°F) and maximums of 33°C (92°F). September is also significantly wetter, experiencing 213 mm (8.4 in) of precipitation over 21 days, compared to May's 137 mm (5.4 in) over just 13 days. Despite both months having relatively high humidity, September's humidity level of 89% surpasses May's 81%, contributing to a more muggy atmosphere. For more detailed insights about the weather during this time, check out Ashikaga weather in May.
In comparing the weather of September and June, both months showcase warm temperatures, but September tends to be slightly warmer. September has a minimum temperature of 13°C (55°F) and can reach up to 35°C (95°F) with an average temperature of 23°C (74°F). In contrast, June starts off a bit cooler, with a minimum of 12°C (54°F) and a maximum of 33°C (92°F), resulting in an average temperature of 22°C (72°F). Rainfall is more prevalent in September, with 213 mm (8.4 in) of precipitation over 21 days, compared to June's 175 mm (6.9 in) over 17 days. Humidity levels are similarly high for both months, at 89% for September and 88% for June. For more details on the weather in June, you can visit Ashikaga weather in June.
When comparing the weather in September and July, several notable differences can be observed. September features a broader temperature range, with minimums of 13°C (55°F) and maximums reaching up to 35°C (95°F), while the average temperature hovers around 23°C (74°F). Conversely, July tends to be warmer overall, with minimums of 17°C (63°F), average highs of 25°C (78°F), and scorching maximums that can hit 37°C (98°F). Precipitation is also more pronounced in July, with 274 mm (10.8 in) of rainfall compared to September's 213 mm (8.4 in), occurring over the same number of days—21. Humidity levels are quite high in both months, with September at 89% and July slightly higher at 92%. For a more detailed look at July’s weather specifics, you can check Ashikaga weather in July.
September weather shows a noticeable transition from the hotter days of August. While August experiences higher temperatures with a minimum of 16°C (61°F) and an average of 27°C (82°F), September cools down slightly with a minimum of 13°C (55°F) and an average of 23°C (74°F). The maximum temperatures also dip, reaching up to 35°C (95°F) in September compared to 37°C (98°F) in August. However, September sees an increase in precipitation, totaling 213 mm (8.4 in) over 21 days, compared to August's 163 mm (6.4 in) over 17 days. Humidity remains relatively high in both months, with September at 89% and August at 92%. For a more detailed look at August weather, visit Ashikaga weather in August.
September and October present distinct shifts in weather patterns. In September, temperatures range from a minimum of 13°C (55°F) to a scorching maximum of 35°C (95°F), with an average temperature of 23°C (74°F). The month is characterized by high humidity at 89% and significant rainfall, totaling 213 mm (8.4 in) over 21 days. In contrast, October sees cooler conditions, with temperatures dipping to a minimum of 5°C (41°F) and averaging 18°C (64°F), peaking at 31°C (88°F). Though October experiences even higher precipitation at 267 mm (10.5 in) over 16 days, the humidity remains relatively stable at 87%. For a detailed look at what to expect, you can check out Ashikaga weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a mild 13°C (55°F) at night to a scorching 35°C (95°F) during the day, with an average of 23°C (74°F). The month is marked by high humidity at 89% and significant rainfall, totaling 213 mm (8.4 in) over 21 days. In stark contrast, November sees colder temperatures with nightly lows plummeting to -2°C (29°F) and daytime highs reaching a comfortable 24°C (75°F), averaging 12°C (53°F). Precipitation drops drastically to 57 mm (2.3 in) over just 7 days and humidity slightly decreases to 85%. For more detailed information, you can visit Ashikaga weather in November.
In September, the weather is significantly warmer, with temperatures ranging from a cool 13°C (55°F) at night to a scorching 35°C (95°F) during the day, while average precipitation is quite high at 213 mm (8.4 in) over 21 days, resulting in high humidity at 89%. In contrast, December brings a much chillier atmosphere, with temperatures dropping to a minimum of -3°C (27°F) and a maximum of 19°C (66°F), accompanied by far less precipitation of only 45 mm (1.8 in) spread over just 6 days and a slightly lower humidity of 86%. For more detailed information on December weather, you can check out Ashikaga weather in December.
As September arrives in Ashikaga, the weather starts to shift noticeably from the sweltering summer months. Temperatures remain warm, but the intense heat begins to recede, creating a more comfortable atmosphere for outdoor activities. This month also brings increased precipitation, with rain making its presence felt on nearly three-quarters of the days, contributing to the lush greenery that characterizes the region. The high humidity levels, peaking at 89%, can make the air feel heavy, but this moisture is essential for the vibrant landscapes that define the transition into autumn. For those curious about the broader patterns and nuances of Ashikaga’s weather, additional information can be found here: Ashikaga Climate.