Last updated: August 21, 2025
In September, Itoshima, Japan, experiences a dynamic climate characterized by warm temperatures and high humidity. With maximum highs reaching 34°C (94°F) and an average temperature of 25°C (77°F), the month offers a blend of summer warmth and early autumn coolness. The minimum temperature typically hovers around 17°C (63°F), providing mild nights. However, expect frequent rainfall, with 204 mm (8.1 in) of precipitation accumulated over 15 days, adding a refreshing touch to the atmosphere. With a humidity level of 84%, the air can feel quite muggy, making it essential to stay hydrated and prepared for the occasional downpour.
In September, Itoshima enjoys a pleasant transition from summer's heat to the cooler embrace of autumn. With minimum temperatures around 17°C (63°F) and averages soaring to 25°C (77°F), the month offers a delightful blend of warmth, making it ideal for outdoor activities. Daytime highs can reach a sizzling 34°C (94°F), reminiscent of the peak summer months, but the overall trend leans toward a more comfortable climate. As the month progresses, the gentle decline in temperatures sets the stage for the crisp, refreshing air of October, signaling the arrival of fall while still allowing for enjoyable, sun-filled days.
In September, Itoshima experiences a notable shift in precipitation, recording 204 mm (8.1 in) of rainfall over 15 days. This marks a decline from the heavy downpours of July and August, which saw significantly higher totals of 321 mm (12.6 in) and 285 mm (11.2 in), respectively. Despite the reduced intensity, September’s rainfall continues to contribute to the region's lush greenery and vibrant landscapes, as the transition into autumn begins. The weather during this month reflects a balance between lingering summer humidity and the onset of cooler air, making it an interesting time for both locals and visitors to experience Itoshima's natural beauty.
In September, humidity in Itoshima, Japan, settles at a comfortable 84%, following the sweltering peak of the summer months. As the summer heat gives way to autumn, the humidity gradually decreases from the July high of 92% and August's 91%, marking a transition towards drier conditions. This slight drop is part of a broader trend throughout the year, where humidity typically oscillates between the 70s% in the winter months and peaks in the 80s% during the summer. September's levels create a pleasant atmosphere, balancing warmth and moisture, perfectly encapsulating the early autumn charm that envelops Itoshima.
In September, the UV Index in Itoshima, Japan, remains notably high at 11, categorizing it as extreme and signifying that sun protection is crucial. This level of intensity sustains the trend seen over the summer months, where UV Index readings have consistently hovered between 11 and 12 from April through August. As the region transitions into autumn, while the burn time remains short at just 10 minutes, it serves as a reminder that UV exposure doesn't diminish drastically with the changing seasons. With the approach of October, the UV Index will decrease, but for September, outdoor enthusiasts should remain vigilant about sun safety. For more details on UV levels throughout the year, visit Itoshima UV Index.
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In September, Itoshima, Japan, basks in a delightful 256 hours of sunshine, marking a gentle transition from the sun-drenched peak of summer. This subtle decrease from the blistering 304 hours of August reveals a gradual shift in the season, as autumn colors begin to emerge. Strikingly, the sunshine hours have consistently increased from the start of the year, with a notable peak in May at 292 hours. The steady climb peaks in August, only to gracefully taper off as the days shorten, leading into October's modest 253 hours. This trend showcases Itoshima's vibrant summer, creating a warm embrace for visitors and locals alike as they savor the last rays of summer before the cooler months arrive.
In Itoshima, Japan, September offers a 33% chance of sunny weather, making it a transitional month as summer gives way to autumn. This percentage aligns with the trends observed in the summer months, where the likelihood of sunshine dwindles, peaking in April with 41% before descending to July's low of 20%. However, September marks a subtle improvement over the summer's dim prospects, hinting at a return to clearer skies as the region prepares for the more sun-friendly months of October and November, which feature chances of sun at 60% and 48%, respectively. As fall approaches, visitors can expect a mix of lingering warmth and occasional sunny days, making it an ideal time to enjoy the natural beauty of Itoshima.
In Itoshima, Japan, the month of September offers a gentle transition from the long, sunlit days of summer into the shorter daylight of autumn. With 12 hours of daylight, September marks a slight decrease from the 14 hours enjoyed in both July and June, yet it still provides ample sunshine for outdoor activities. As the year progresses, daylight gradually diminishes, dipping to 11 hours in October and continuing its decline into the winter months. This rhythmic shift in daylight not only enhances the changing colors of nature but also invites residents and visitors alike to savor the lingering warmth of early autumn before the days grow shorter.
As September rolls into Itoshima, Japan, the average wind speed picks up slightly to 2.6 m/s (6 mph), hinting at the transition from summer's calm to the brisk autumn air. This increase, albeit modest, contrasts with the summer months of July and August, which saw even lighter breezes averaging 2.5 m/s and 2.4 m/s respectively. September often brings an invigorating change, as the winds begin to gather strength once more, preparing the landscape for the more powerful gusts of fall and winter. Observing this subtle uptick in wind speed, one can't help but feel the onset of a refreshing new season, where the gentle whispers of the summer months give way to the more spirited currents of autumn.
Weather in Itoshima varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Itoshima, focusing on differences in temperature, rainfall, humidity, and UV levels.
September weather is characterized by warm temperatures, with minimums averaging 17°C (63°F) and maximums reaching up to 34°C (94°F), while the average temperature hovers around 25°C (77°F). This month also sees significant rainfall, totaling 204 mm (8.1 in) spread across 15 days, contributing to a high humidity level of 84%. In contrast, January presents a much cooler climate, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 17°C (63°F), and an average of only 8°C (46°F). Precipitation during this month is lighter, totaling 60 mm (2.4 in) over 8 days, and the humidity is slightly lower at 75%. For more detailed insights, you can check Itoshima weather in January.
September and February showcase contrasting weather patterns. In September, temperatures range from a mild 17°C (63°F) to a high of 34°C (94°F), with an average of 25°C (77°F). The month is relatively wet, receiving 204 mm (8.1 in) of precipitation over 15 days and a high humidity level of 84%. In stark contrast, February experiences much cooler conditions, with temperatures dipping to a minimum of -1°C (31°F) and reaching a maximum of 20°C (68°F), averaging around 8°C (46°F). Precipitation is significantly lower at 78 mm (3.1 in) across 10 days, accompanied by a reduced humidity level of 71%. For a more detailed look at February's climate, you can visit Itoshima weather in February.
When comparing the weather in September and March, there are stark differences in temperature and humidity. September typically boasts warmer conditions with average temperatures around 25°C (77°F) and highs reaching up to 34°C (94°F), while March is much cooler, with averages of just 11°C (53°F) and maximums around 21°C (71°F). Precipitation is also more significant in September, with 204 mm (8.1 in) falling over 15 days compared to March's 121 mm (4.8 in) over 11 days. Additionally, the humidity in September is higher at 84%, while March sees a lower 71%. For more detailed insights into March weather, you can refer to Itoshima weather in March.
In September, the weather is notably warmer compared to April, with average temperatures reaching 25°C (77°F), peaking at 34°C (94°F) and rarely dropping below 17°C (63°F). In contrast, April experiences cooler conditions, with an average temperature of just 15°C (60°F), a maximum of 26°C (79°F), and a minimum of 6°C (43°F). Additionally, September is much wetter, receiving 204 mm (8.1 in) of precipitation over 15 days, while April has a lighter total of 112 mm (4.4 in) spread over only 8 days. Humidity levels are slightly higher in September at 84%, compared to April's 78%. For a more detailed perspective, you can check Itoshima weather in April.
In comparing the weather between September and May, September generally experiences warmer temperatures, with average highs reaching 34°C (94°F) compared to May's maximum of 28°C (83°F). The minimum temperature in September is also higher, starting at 17°C (63°F) versus May's 11°C (51°F). However, September tends to be wetter, with total precipitation of 204 mm (8.1 in) over 15 days, while May has less rainfall at 155 mm (6.1 in) over 11 days. Interestingly, both months share the same level of humidity at 84%, creating a consistently humid climate regardless of the differences in temperature and precipitation. For more detailed information, you can check Itoshima weather in May.
When comparing the weather in September to that in June, several notable differences emerge. September tends to be warmer overall, with average temperatures reaching 25°C (77°F) compared to June's 23°C (74°F). Both months share the same minimum temperature of 17°C (63°F), but September can peak at a higher maximum of 34°C (94°F), while June's maximum only reaches 31°C (88°F). In terms of precipitation, September receives slightly more with 204 mm (8.1 in) across 15 days, as opposed to June’s 184 mm (7.3 in) over 13 days. Humidity levels are quite similar, with September at 84% and June at 86%, making both months feel quite humid. For more detailed insights into June weather, you can check Itoshima weather in June.
When comparing the weather in September to July, we find some notable differences. September experiences slightly cooler temperatures, with a minimum of 17°C (63°F) and an average of 25°C (77°F), while July has temperatures that range from a minimum of 20°C (68°F) to an average of 27°C (81°F). Additionally, July tends to be wetter, recording 321 mm (12.6 in) of precipitation over 18 days compared to September's 204 mm (8.1 in) over 15 days. Humidity levels are also higher in July at 92%, as opposed to September’s 84%. The contrast in these months reveals a transition from the peak summer heat of July to the more moderate conditions of September. For more detailed information, you can check Itoshima weather in July.
In comparing the weather of September and August, September tends to be slightly cooler with average temperatures ranging from a low of 17°C (63°F) to a high of 34°C (94°F), while August exhibits warmer temperatures with minimums around 21°C (69°F) and maximums peaking at 36°C (97°F). Precipitation levels are higher in August, with a total of 285 mm (11.2 in) recorded over 14 days, compared to September's 204 mm (8.1 in) over 15 days. Humidity also remains notably high in both months, at 84% in September and 91% in August. For a detailed look at the weather in August, you can visit Itoshima weather in August.
In comparing the weather between September and October, September tends to be warmer and more humid. With temperatures ranging from a minimum of 17°C (63°F) to a maximum of 34°C (94°F), the average temperature reaches 25°C (77°F). The month also experiences significant precipitation, totaling 204 mm (8.1 in) over 15 days, accompanied by high humidity at 84%.
In contrast, October brings a noticeable drop in temperature, with a minimum of 12°C (54°F) and a maximum of 30°C (87°F), leading to a more comfortable average of 20°C (69°F). Additionally, precipitation decreases to 111 mm (4.4 in) over 10 days and humidity remains relatively stable at 83%. For more insights, you can check Itoshima weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a minimum of 17°C (63°F) to a maximum of 34°C (94°F), with an average of 25°C (77°F). The month sees substantial rainfall, totaling 204 mm (8.1 in) over about 15 days, along with notable humidity levels at 84%. In sharp contrast, November experiences cooler temperatures, with a minimum of 6°C (42°F), an average of 15°C (59°F), and a maximum of 24°C (75°F). Furthermore, precipitation significantly drops to 51 mm (2.0 in) spread over just 7 days, along with a slightly lower humidity level of 81%. For more details on November's climate, you can visit Itoshima weather in November.
September and December present a stark contrast in weather conditions. In September, temperatures range from a minimum of 17°C (63°F) to a maximum of 34°C (94°F), with an average of 25°C (77°F). The month is characterized by high humidity at 84% and considerable precipitation, with 204 mm (8.1 in) falling over 15 days. In contrast, December sees much cooler temperatures, with a minimum of 1°C (35°F), an average of 9°C (49°F), and a maximum of 23°C (74°F). Precipitation in December is notably lower at 71 mm (2.8 in) over just 9 days, and humidity decreases slightly to 79%. For more specific information about weather patterns in December, you can check Itoshima weather in December.
As summer transitions into autumn, Itoshima's September weather offers a unique blend of warmth and moisture. With average temperatures hovering around a comfortable 25°C, the month sees a significant dip in daily highs compared to the scorching summer peaks. This change invites a refreshing balance, although high humidity levels at 84% and over two weeks of rain can make it feel quite muggy. Unlike the drier months ahead, September represents a bridging point, where frequent rainfall nourishes the landscape and sets the stage for fall. For a more detailed look at seasonal changes, check out Itoshima Climate.