Last updated: August 21, 2025
In September, Choshi, Japan, experiences a warm and humid climate, with maximum temperatures reaching 32°C (89°F) and an average of 24°C (76°F). Nights offer a respite with minimums around 18°C (64°F). The month sees significant rainfall, accumulating to 185 mm (7.3 in) over approximately 16 days, contributing to a high humidity level of 83%. This combination of warmth and moisture creates a lush, vibrant environment, typical of late summer in this coastal region, inviting visitors to enjoy both its scenic beauty and unique weather patterns.
In Choshi, Japan, September marks a transition into milder autumn temperatures, with a minimum of 18°C (64°F) and an average of 24°C (76°F). This month maintains the summer's warmth, peaking at a comfortable 32°C (89°F), mirroring the highs of August but gradually hinting at the cooler days ahead. As the month progresses, nights become more refreshing, suggesting a shift from the intense summer heat experienced earlier. The steady decrease in temperatures from July’s highs indicates a welcoming change, making September an ideal time to enjoy the tail end of summer while soaking in the beauty of emerging autumn colors.
In September, Choshi experiences a significant uptick in precipitation, with the region receiving 185 mm (7.3 in) of rain over 16 days. This marks a notable increase compared to the lighter summer months, particularly August's 94 mm (3.7 in), indicating the shift toward the wetter part of the year. As summer gives way to autumn, Choshi's precipitation tends to ramp up, setting the stage for even wetter October averages, which can reach 274 mm (10.8 in). The trend highlights a seasonal transition, where the frequency and intensity of rainfall begin to rise, showcasing the dynamic weather patterns of this coastal area.
In Choshi, Japan, September marks a transition in humidity as the summer heat gradually recedes. With an average humidity of 83%, September still retains the lingering moisture of the warmer months, though it’s a slight drop from the peak levels observed in July (94%) and August (87%). This month strikes a balance between the oppressive humidity of summer and the more temperate conditions of autumn, with October bringing a further decrease to 78%. Overall, September reflects a gradual shift, offering a still-sweltering yet more comfortable atmosphere as the region begins to welcome the cooler air of the coming fall.
In September, Choshi experiences a very high UV Index of 10, signaling that sun exposure can lead to skin damage in just 15 minutes. This pattern continues the trend established over the summer months, where the UV levels peaked at extreme levels. As the year transitions from the intense summer heat into the milder autumn, the UV Index sees a slight decrease, yet it remains a significant concern for sun safety. Maintaining protective measures is vital as the sun's rays can still cause harm during this period. For a deeper dive into sun safety and the UV Index throughout the year, check out Choshi UV Index.
UV Risk Categories
September in Choshi, Japan, greets you with a delightful 251 hours of sunshine, marking a warm transition into autumn. As summer fades, it follows an impressive August peak of 311 hours, showcasing the region's sun-soaked generosity during the peak of summer. Despite the slight decline, September maintains a robust level of daylight, significantly higher than earlier months like January (184 hours) and February (226 hours). This trend of gradually decreasing daylight continues into October but remains pleasant enough for outdoor exploration. As the days shorten, Choshi's lingering warmth invites visitors to savor the last blooms of summer before embracing the cozy embrace of autumn.
In September, Choshi, Japan experiences a 30% chance of sunny weather, marking a notable dip compared to the preceding summer months of July and August, which enjoy chances of 38% and 39%, respectively. This decline aligns with a gradual transition into autumn, as the sun's presence diminishes while the likelihood of cloud cover increases. Interestingly, the chance of sunny days picks up again in October, highlighting the somewhat unpredictable weather patterns in this coastal region. Overall, while September may not boast the brightest skies, it continues the trend of fluctuating conditions characteristic of the changing seasons, inviting a blend of mild weather and occasional sunshine.
As September arrives in Choshi, Japan, the daylight duration begins its gradual transition towards the shorter days of autumn. With 12 hours of daylight, September marks a slight decrease from the summer peak of 14 hours in June, July, and August. This subtle shift is indicative of the seasonal changes at play, as the rich, long days of summer give way to a more balanced light. As daylight continues to wane through October and into the winter months, the rhythm of nature unfolds, reflecting the passage of time and the impending arrival of the cooler seasons. Observers can delight in the lingering warmth of late summer while being reminded of the cozy autumn evenings that lie ahead.
In September, the winds of Choshi, Japan, gently pick up to an average speed of 5.1 m/s (12 mph), maintaining a steady rhythm that echoes the transition from summer to autumn. This month showcases a slight recovery from the calmer July and August months, where wind speeds dipped to their lowest. With September’s breeze, there’s a refreshing change in the air, hinting at the cooler days to come. Overall, the trend leading into this month suggests a gradual increase in wind strength, peaking in the spring and early winter months, while the late summer brings a temporary lull before autumn reigns.
Weather in Choshi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Choshi, focusing on differences in temperature, rainfall, humidity, and UV levels.
September weather is markedly warmer and more humid compared to January. With average temperatures ranging from a minimum of 18°C (64°F) to a maximum of 32°C (89°F), September often feels quite tropical, compounded by high humidity levels of 83%. In contrast, January experiences much cooler temperatures, with a monthly average of just 8°C (46°F), peaking at 17°C (63°F) and dipping to 0°C (32°F) at night. Precipitation is also significantly lower in January, with only 65 mm (2.6 in) over about 7 days compared to September's 185 mm (7.3 in) across 16 days. For a detailed look at January weather, check out Choshi weather in January.
September and February showcase a stark contrast in weather. In September, temperatures range from a minimum of 18°C (64°F) to a maximum of 32°C (89°F), with an average of 24°C (76°F). This month also experiences significant rainfall, tallying up to 185 mm (7.3 in) over 16 days, while humidity remains high at 83%. Conversely, February presents a much cooler climate, with temperatures dipping to a minimum of 1°C (33°F) and averaging just 8°C (47°F), peaking at 18°C (65°F). Rainfall is considerably less in February, amounting to 59 mm (2.3 in) over 10 days and accompanied by a lower humidity level of 69%. For more detailed insights, you can check Choshi weather in February.
September and March present stark contrasts in weather patterns. In September, temperatures range from a minimum of 18°C (64°F) to a maximum of 32°C (89°F), with an average of 24°C (76°F). This month also sees high humidity at 83% and significant rainfall, totaling 185 mm (7.3 in) over about 16 days. In comparison, March is much cooler, with temperatures ranging from a chilly 3°C (38°F) at night to a pleasant 20°C (69°F) during the day, averaging only 11°C (53°F). Although March experiences less overall precipitation than September, with 161 mm (6.3 in) across 15 days, humidity remains lower at 68%. For more details on the weather specifically during this month, you can refer to Choshi weather in March.
When comparing the weather in September and April, it's clear that September tends to be warmer and more humid. In September, the temperatures range from a minimum of 18°C (64°F) to a maximum of 32°C (89°F), with an average temperature of 24°C (76°F). It also experiences significant rainfall, totaling 185 mm (7.3 in) over approximately 16 days, contributing to a high humidity level of 83%. In contrast, April offers a much cooler climate, with temperatures ranging from a low of 5°C (41°F) to a high of 23°C (74°F) and an average temperature of 14°C (58°F). Additionally, April sees less precipitation, with 116 mm (4.6 in) spread over just 11 days and lower humidity at 73%. For more specific details about the weather in Choshi during April, you can refer to Choshi weather in April.
September weather tends to be warmer and more humid than May, with average temperatures ranging from a minimum of 18°C (64°F) to a maximum of 32°C (89°F), compared to May's range of 11°C (53°F) to 26°C (78°F). Additionally, September experiences more rainfall, with 185 mm (7.3 in) over 16 days, while May sees 144 mm (5.7 in) across just 12 days. The humidity in September is also slightly higher at 83% compared to May's 81%. For those interested in the specifics of May's weather patterns, you can find more details here: Choshi weather in May.
September generally showcases warmer temperatures compared to June, with average highs reaching 32°C (89°F) versus June's peak of 28°C (83°F). Both months experience significant rainfall, with September seeing slightly more precipitation at 185 mm (7.3 in) over 16 days compared to June's 184 mm (7.2 in) over 13 days. Additionally, September has a lower humidity level at 83%, while June tends to be more humid at 88%. Overall, September offers a warmer climate, whereas June tends to feel cooler and slightly wetter. For more details, you can check out Choshi weather in June.
In comparing the weather of September and July, we see some notable differences. September features a slightly wider temperature range, with minimums of 18°C (64°F) and maximums reaching up to 32°C (89°F), resulting in an average temperature of 24°C (76°F). In contrast, July has a higher average temperature of 25°C (77°F) with minimums of 20°C (68°F) and maximums peaking at 30°C (87°F). When it comes to precipitation, September experiences a total of 185 mm (7.3 in) over 16 days, while July sees a bit more rainfall, accumulating 201 mm (7.9 in) across 15 days. Moreover, humidity levels are higher in July at 94%, compared to September's 83%. For a closer look at the climate specifics, you can explore Choshi weather in July.
In comparing the weather between September and August, September exhibits slightly cooler temperatures with a minimum of 18°C (64°F) and an average of 24°C (76°F), compared to August's higher minimum of 21°C (70°F) and average of 27°C (80°F). Both months experience the same maximum temperature of 32°C (90°F). However, September sees a significant increase in precipitation, totaling 185 mm (7.3 in) over 16 rainy days, whereas August has only 94 mm (3.7 in) over 12 days. Additionally, September's humidity at 83% is slightly lower than August's 87%. For more details, you can check Choshi weather in August.
September and October display notable differences in weather patterns. In September, temperatures range from a minimum of 18°C (64°F) to a maximum of 32°C (89°F), with an average of 24°C (76°F). This month also experiences significant rainfall, totaling 185 mm (7.3 in) over 16 days, along with relatively high humidity at 83%. In contrast, October sees cooler temperatures, with a minimum of 12°C (53°F) and a maximum of 29°C (84°F), averaging at 20°C (68°F). Precipitation increases to 274 mm (10.8 in) over 17 days, while humidity decreases slightly to 78%. For a more detailed look at the weather during this month, check out Choshi weather in October.
September typically features warmer temperatures, with a minimum of 18°C (64°F), an average of 24°C (76°F), and a maximum reaching up to 32°C (89°F). The month is quite humid, with 83% humidity and significant precipitation of 185 mm (7.3 in) over 16 days. In contrast, November brings much cooler conditions, where temperatures drop to a minimum of 6°C (43°F), an average of 15°C (60°F), and a maximum of 22°C (72°F). November also sees less rainfall, totaling 124 mm (4.9 in) across just 12 days, and the humidity decreases to 74%. For more detailed information, you can check out Choshi weather in November.
September and December present stark contrasts in weather. In September, the temperature ranges from a minimum of 18°C (64°F) to a maximum of 32°C (89°F), with an average of 24°C (76°F). The month is characterized by high humidity at 83% and significant rainfall, receiving 185 mm (7.3 in) over 16 days. In contrast, December sees a much cooler climate, with temperatures ranging from a chilly 1°C (35°F) to a comfortable 21°C (70°F), and an average of just 10°C (51°F). Precipitation decreases to 96 mm (3.8 in) over 10 days, and humidity drops to 72%. For more detailed insights on December weather, you can explore Choshi weather in December.
As September arrives in Choshi, a distinct shift in weather can be felt compared to the hotter summer months. Temperatures are more moderate, averaging around 24°C, making outdoor activities enjoyable. However, expect increased humidity and notable rainfall, with about 185 mm falling over 16 days, which often leads to a lush landscape. This blend of warmth and moisture not only transforms the local environment but also sets the stage for the upcoming autumn. For a deeper dive into Choshi's weather patterns, check out Choshi Climate.