Last updated: August 21, 2025
September in Omihachiman, Japan offers a warm transition from summer, with maximum temperatures reaching 34°C (94°F) and an average of 23°C (74°F). Nights cool down to a refreshingly mild 14°C (57°F). During this month, the region experiences considerable rainfall, totaling 165 mm (6.5 in) over approximately 13 days, contributing to a high humidity level of 87%. This blend of warmth and moisture fosters a lush environment, making it an intriguing time for visitors to explore the natural beauty and cultural heritage of this charming city.
September in Omihachiman, Japan marks a beautiful transition into autumn, as temperatures begin to cool while still retaining a hint of summer warmth. With minimums around 14°C (57°F) and averages of 23°C (74°F), the early part of the month often feels pleasantly warm. The maximum temperature can reach up to 34°C (94°F), echoing the lingering summer heat that gradually gives way to more comfortable days. As the month progresses, cooler evenings set in, hinting at the approaching autumn. This pattern not only showcases a shift from the sweltering highs of July and August but also invites visitors to enjoy the vibrant fall foliage that characterizes the region.
In September, Omihachiman experiences a notable shift in precipitation, receiving approximately 165 mm (6.5 in) of rain over 13 days. This marks a slight decrease from the summer's peak in July with its staggering 286 mm, but it's still significantly above the drier months that follow. The transition into autumn brings a rich tapestry of rainy days, positioning September as a crucial month in the wet season. Coupled with August's rainfall of 188 mm, September maintains this trend of moisture-rich weather, setting the stage for the impending October rainfall that escalates to 224 mm. As such, September serves as a vital bridge, balancing the heavy summer rains with the shift toward the cooler, wetter months ahead.
In September, Omihachiman experiences a noticeable shift in humidity, maintaining a robust 87%—a level that echoes the sultry warmth of late summer while signaling the onset of autumn. This month retains high moisture levels, reminiscent of the preceding July and August, where humidity peaks at 93% and 91% respectively. However, as the temperatures start to drop and the days become shorter, September’s humidity begins to taper off slightly, hinting at a transition toward the drier months ahead in October, where average humidity is recorded at 85%. This pattern illustrates a yearly rhythm, characterized by soaring humidity in the summer, followed by a gradual decline as the cooler seasons approach, inviting a refreshing change in the air.
In September, Omihachiman experiences a very high UV Index of 10, indicating that sun exposure can lead to harm in just 15 minutes. This slight decrease from the peak extreme levels of 11 seen during the summer months suggests a marginal relief as autumn approaches, though caution is still warranted. The data reveals a consistent trend of elevated UV levels from March through September, with burn times decreasing as the index rises, signaling the need for protective measures. As daylight diminishes, October will see a further drop to a high UV Index of 7, extending the seasonal consideration for skin protection. For more insights on UV exposure in this region, check the detailed information at Omihachiman UV Index.
UV Risk Categories
In September, Omihachiman basks in a delightful 232 hours of sunshine, marking a gentle transition from the sultry summer to the crispness of autumn. This month showcases a slight decline from the sun-drenched 292 hours of August, but it’s still robust compared to the earlier months of the year. As the days gradually cool and the vibrant foliage begins to emerge, September’s sunlight provides a perfect backdrop for outdoor activities and scenic adventures. Notably, the trend of increasing daylight hours from January through August peaks in summer, after which the light begins to taper off. Yet, September's ample sunshine continues to encourage exploration and appreciation of this picturesque Japanese town, bridging the gap between the warmth of summer and the charm of fall.
September in Omihachiman showcases a modest 26% chance of sunny weather, reflecting the gradual transition into autumn. This percentage hints at a notable decrease in sunshine compared to the earlier summer months, where July and August demonstrate considerably lower probabilities of clear skies, at 32% and 23% respectively. As the year progresses into October, the likelihood of sunny days significantly increases to 50%, highlighting a shift toward drier and clearer conditions. This trend suggests that while September may still host occasional sunny spells, it's also a time when the lingering hints of summer give way to the cooler, more stable weather characteristic of fall.
In Omihachiman, Japan, the rhythm of daylight throughout the year creates a dynamic tapestry of light and shadow. As summer gives way to autumn, September marks a gentle transition with 12 hours of daylight, signaling a gradual decrease from the sun-kissed days of summer. This month bridges the abundance of 14 hours seen in June, July, and August, leading into the shorter days of October. The trend showcases a clear pattern: the daylight begins to wane after the vibrant spring and summer, settling at a comfortable length that invites cooler evenings while hinting at the approaching autumn chill. With each passing month, the sunlight intertwines with the seasonal changes, painting a beautiful portrait of time in this charming Japanese town.
In September, Omihachiman experiences a gentle average wind speed of 2.4 m/s (5 mph), maintaining the same light breeze felt in August. This marks a notable decline from the spring months, where the winds picked up slightly to 3.4 m/s (8 mph) in March. As summer fades and autumn approaches, the calming winds create a serene atmosphere, perfect for appreciating the picturesque landscapes of this charming Japanese town. The transition into October brings a slight increase to 2.6 m/s (6 mph), hinting at the seasonal shifts ahead while keeping the overall wind character soft and inviting.
Weather in Omihachiman varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Omihachiman, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present starkly contrasting weather conditions. September boasts a warm average temperature of 23°C (74°F), with daily highs reaching up to 34°C (94°F) and a relatively high humidity of 87%. This month also experiences considerable rainfall, totaling 165 mm (6.5 in) across 13 days. In contrast, January brings a chilly atmosphere, with an average temperature of just 4°C (39°F), dipping as low as -6°C (22°F). Precipitation is less frequent, with only 71 mm (2.8 in) over the same number of days, and humidity is slightly lower at 82%. For more details about January weather, you can check Omihachiman weather in January.
September and February present stark contrasts in weather. In September, temperatures can range from a mild 14°C (57°F) to a scorching 34°C (94°F), with an average of 23°C (74°F). The month is characterized by high humidity at 87% and significant rainfall, totaling 165 mm spread over 13 days. In contrast, February brings much cooler conditions, with temperatures dipping as low as -10°C (13°F) and reaching a max of 20°C (68°F), averaging just 4°C (40°F). The month experiences less precipitation, totaling 69 mm over 12 days, and a lower humidity level of 79%. For those interested in a detailed look at February weather, you can visit Omihachiman weather in February.
When comparing the weather in September and March, it's clear that the two months present quite different climates. September boasts a warm average temperature of 23°C (74°F), with highs reaching up to 34°C (94°F), while March experiences much cooler temperatures, averaging 9°C (48°F) with a maximum of 23°C (75°F). Rainfall in September is more significant, with 165 mm (6.5 in) of precipitation over 13 days, compared to March’s 125 mm (4.9 in) during the same number of days. Additionally, September's humidity is notably higher at 87%, compared to March's more moderate 74%. For a closer look at March weather, you can visit Omihachiman weather in March.
When comparing the weather in September and April, significant differences emerge. September typically experiences warmer temperatures, with lows around 14°C (57°F) and highs reaching up to 34°C (94°F), resulting in an average of 23°C (74°F). In contrast, April has more moderate temperatures, ranging from a chilly 0°C (32°F) at its minimum to a comfortable maximum of 27°C (80°F), averaging just 13°C (56°F).
Precipitation is also notable in both months; September sees a higher rainfall of 165 mm (6.5 in) over about 13 days, while April has slightly less at 142 mm (5.6 in) over 11 days. Moreover, humidity levels are higher in September at 87%, compared to 76% in April, making the latter month feel more pleasant overall. For more detailed information about weather specifics in April, you can visit Omihachiman weather in April.
September and May present distinctly different weather conditions. September typically showcases warmer temperatures, with a minimum of 14°C (57°F), an average of 23°C (74°F), and a maximum reaching up to 34°C (94°F). In contrast, May's cooler temperatures start at a minimum of 6°C (43°F) and peak at a maximum of 32°C (89°F), averaging around 18°C (65°F). While both months experience significant rainfall, September has a higher precipitation total of 165 mm (6.5 in) over 13 days, compared to May's 143 mm (5.6 in) over 11 days. Additionally, September tends to be slightly more humid, with levels at 87%, while May's humidity is recorded at 83%. For a closer look at May weather specifics, visit Omihachiman weather in May.
September and June exhibit similar weather patterns, with both months experiencing comparable humidity levels of 87%. September showcases slightly warmer temperatures, with minimums around 14°C (57°F) and highs reaching up to 34°C (94°F), compared to June's minimum of 11°C (52°F) and maximum of 32°C (90°F). Additionally, both months receive approximately the same amount of precipitation, around 166 mm (6.5 in) over 13 days, indicating a consistent likelihood of rain during this time. For a closer look at the specifics of June weather, you can visit Omihachiman weather in June.
In comparing the weather between September and July, one can observe distinct differences in temperature and precipitation. September features a minimum temperature of 14°C (57°F) and an average of 23°C (74°F), whereas July is warmer, with a minimum of 19°C (66°F) and an average of 26°C (79°F). July also boasts higher maximum temperatures, reaching up to 36°C (98°F), compared to September's maximum of 34°C (94°F). Additionally, July experiences significantly more precipitation, with 286 mm (11.3 in) over 21 days, while September sees only 165 mm (6.5 in) across 13 days. The humidity levels are slightly lower in September at 87%, compared to July's 93%. For more detailed information, you can visit Omihachiman weather in July.
In comparing the weather of September and August, September experiences slightly cooler temperatures, with a minimum of 14°C (57°F) and an average of 23°C (74°F), compared to August's minimum of 18°C (64°F) and average of 28°C (82°F). The maximum temperatures also reflect this trend, with September reaching a high of 34°C (94°F) against August's peak of 37°C (99°F). Precipitation is somewhat lower in September, totaling 165 mm (6.5 in) over 13 days, whereas August records 188 mm (7.4 in) over 15 days. Humidity remains high in both months, with September at 87% and August slightly higher at 91%. For more details on how August contributes to the humid climate, check Omihachiman weather in August.
September typically presents warmer temperatures, with a minimum of 14°C (57°F) and an average of 23°C (74°F), while October sees cooler conditions, dropping to a minimum of 8°C (46°F) and an average of 18°C (64°F). Although October's maximum temperature can reach 31°C (88°F), it is generally milder compared to September’s highs of 34°C (94°F). Precipitation increases significantly in October, totaling 224 mm (8.8 in) over the same 13 days as September, which had 165 mm (6.5 in). Both months experience high humidity, with September slightly higher at 87% compared to October's 85%. For more detailed information on October weather, you can visit Omihachiman weather in October.
September weather is characterized by warm temperatures, with a minimum of 14°C (57°F), an average of 23°C (74°F), and a maximum reaching up to 34°C (94°F). This month experiences significant rainfall, with 165 mm (6.5 in) over 13 days, and a high humidity level of 87%. In contrast, November sees a notable drop in temperatures, with a minimum of 1°C (34°F), an average of 12°C (54°F), and a maximum of 24°C (76°F). Precipitation decreases to 52 mm (2.0 in) over just 7 days, and humidity slightly lowers to 83%. For a detailed look at November's climate, visit Omihachiman weather in November.
In September, the weather is typically warm, with average temperatures around 23°C (74°F) and maxing out at 34°C (94°F), creating a humid atmosphere with 87% humidity. This month also sees considerable rainfall, with 165 mm (6.5 in) spread over about 13 days, making it feel quite wet and muggy. In contrast, December brings a sharp drop in temperatures, with averages around 7°C (44°F) and a maximum of 21°C (70°F), while lows can plummet to -5°C (24°F). Precipitation decreases to 90 mm (3.6 in) over approximately 14 days, and humidity stabilizes slightly, hovering around 83%. For more detailed information, you can check Omihachiman weather in December.
As September arrives in Omihachiman, a noticeable shift in weather sets the tone for the month. With an average temperature of 23°C (74°F), it becomes a refreshing transition from the sweltering heat of summer, where maximums can soar up to 34°C (94°F). However, this month also brings increased humidity and a significant amount of precipitation over its 13 rainy days, making it one of the wetter months of the year. This blend of warmth and moisture injects a vibrant pulse into the landscape as nature begins to prepare for the cooler autumn months ahead. For a deeper dive into Omihachiman’s climatic patterns, visit Omihachiman Climate.