Last updated: August 21, 2025
In September, Gero, Japan experiences a delightful transition from summer to autumn, with maximum temperatures reaching 33°C (91°F) and an average of 20°C (69°F). As the month progresses, nighttime dips can bring temperatures down to a refreshing 8°C (46°F). Rain is a common visitor, with 273 mm (10.8 in) of precipitation over approximately 17 days, contributing to the region's lush landscapes. The humidity remains high at 87%, creating a warm, tropical feel that enhances the vibrant colors of early fall. Whether soaking in the famous hot springs or exploring the scenic beauty, visitors will find Gero's September charm irresistible.
As September arrives in Gero, Japan, the warmth of summer is gently easing into the crispness of autumn. With average temperatures around 20°C (69°F), this month provides a delightful transition, featuring minimums of 8°C (46°F) and maximums reaching 33°C (91°F). Visitors can expect pleasantly mild days perfect for outdoor exploration, while cooler evenings invite cozy gatherings. Compared to the scorching July and August, where highs soar above 35°C (94°F), September's temperatures are a welcoming relief, allowing locals and travelers alike to savor the vibrant foliage and cultural festivities that herald the onset of fall.
In September, Gero, Japan, experiences a notable continuation of its rainy season, with precipitation totaling 273 mm (10.8 in) over approximately 17 days. This marks a slight decrease from the heavy downpours of July, which recorded a staggering 527 mm (20.8 in), and the significant 316 mm (12.4 in) from August. The relatively high rainfall in September consolidates the trend of increased moisture that dominates the summer months, ensuring that the lush surrounding landscapes remain vibrant as the region transitions into autumn. This combination of substantial rainfall and numerous wet days reflects Gero's dynamic weather patterns, setting the stage for cooler months that follow.
In September, Gero, Japan, experiences a notable humidity level of 87%, marking a slight decline from the peak summer months of July and August, which recorded humidity levels of 93% and 91% respectively. This drop hints at the transition into autumn, although the humidity remains high compared to the earlier months of the year. From January's 82% to May's 83%, the fluctuations in humidity demonstrate the region's general tendency toward increased moisture during the warmer seasons. As the year progresses, October brings an even lower humidity of 85%, suggesting a gradual easing of the intense summer mugginess while retaining a characteristic dampness typical of Gero's climate.
In September, Gero, Japan, experiences a UV Index of 10, placing it in the very high exposure category with a burn time of just 15 minutes. This slight decrease from the peak of 12 in July reveals a subtle shift as summer transitions to autumn. The UV intensity remains significant, reminding residents and visitors alike to take proper precautions against sun exposure. Comparatively, the UV Index begins to decline after its summer extremes, moving towards October's high level of 7. To learn more about the UV trends throughout the year in Gero, visit Gero UV Index.
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As September casts its gentle warmth over Gero, Japan, the town enjoys a robust 244 hours of sunshine, contributing to a delightful atmosphere during the early autumn. This month marks a transition, following August's peak of 296 sunshine hours. Despite a slight dip, September maintains a favorable abundance of light, continuing the trend of gradual decrease from the summer's zenith. The sunshine hours reflect a continuous ebb and flow, with early spring months like March and April starting off considerably lower, at 266 and 280 hours respectively. As the seasons shift, the gradual decrease in sunshine hours from summer to autumn presents an opportunity to embrace the softer light of September, enhancing the town's picturesque landscapes painted in warm hues.
In Gero, Japan, the likelihood of sunny weather exhibits notable fluctuations throughout the year, with September showing a moderate chance of sunshine at 24%. This positions it just slightly above the summer months, where the sun typically shines for about 22-23% of the time. The onset of autumn brings a gradual increase in sunny days, as seen in the subsequent months of October and November, which boast chances of 52% and 49%, respectively. With September sandwiched between the more overcast summer months and the brighter fall days, it serves as a transitional period, hinting at clearer skies ahead.
In Gero, Japan, the rhythm of daylight throughout the year paints a fascinating picture of seasonal change. As summer fades into fall, September offers a warm transition with approximately 12 hours of daylight. This marks a slight decrease from the 14 hours typical of the midsummer months, reflecting the inevitable shift toward shorter days. The gradual reduction in daylight is a part of the natural ebb and flow of the seasons, closely following the increase of daylight seen in spring, where it blossoms to a peak of 14 hours in May and June. Following September, daylight will continue to lessen, descending to 11 hours in October and dipping further as winter approaches. This delicate balance between light and darkness not only shapes the landscape but also influences the activities and rhythms of life in this serene town.
As September casts its gentle spell over Gero, Japan, the average wind speed whispers a soft melody at 1.4 m/s (3 mph), marking a notable dip from the summer months. Throughout the year, the winds typically sway between 1.3 to 2.3 m/s, with the breeziest conditions mostly felt during the early months. The transition from the vibrant hum of summer, where winds peaked at 1.9 m/s, gives way to the more tranquil sensations of autumn. This subtle reduction invites a serene atmosphere, perfect for enjoying the changing foliage and crisp air as Gero prepares for the end of another year. As autumn progresses, the winds begin to dance once more, reaching back to 1.9 m/s by October, hinting at an invigorating shift in the seasons ahead.
Weather in Gero varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Gero, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is generally warm, with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 33°C (91°F) and an average of 20°C (69°F). However, this month also brings significant rainfall, with 273 mm (10.8 in) of precipitation spread over 17 days, resulting in high humidity levels of 87%.
In contrast, January presents a much colder climate, where temperatures dip significantly, with a minimum of -12°C (10°F) and a maximum of 12°C (54°F), averaging around 0°C (33°F). The precipitation in January is relatively low at 89 mm (3.5 in), occurring over 14 days, with a lower humidity of 82%. For a detailed look at January weather in Gero, you can visit Gero weather in January.
September and February present starkly contrasting weather patterns. In September, temperatures range from a mild 8°C (46°F) at night to a warm 33°C (91°F) during the day, with an average of 20°C (69°F). The month is marked by significant rainfall, totaling 273 mm (10.8 in) over 17 days, and high humidity at 87%. In contrast, February experiences much colder temperatures, with lows plunging to -15°C (5°F) and an average of just 1°C (34°F), peaking at 16°C (61°F). Precipitation drops to 103 mm (4.1 in) over 12 days, accompanied by a lower humidity of 79%. For more insight into February's conditions, you can refer to Gero weather in February.
September and March present contrasting weather patterns. In September, temperatures in Gero range from a minimum of 8°C (46°F) to a maximum of 33°C (91°F), with an average of 20°C (69°F), while March experiences much cooler conditions, with temperatures ranging from -4°C (25°F) to a maximum of 20°C (69°F) and an average of 6°C (43°F). September is characterized by high humidity at 87% and significant precipitation of 273 mm (10.8 in) over 17 days, compared to March's lower humidity of 74% and 183 mm (7.2 in) of precipitation over 14 days. For more specifics about March weather in Gero, visit Gero weather in March.
In September, temperatures are generally warmer, ranging from a minimum of 8°C (46°F) to a maximum of 33°C (91°F), with an average temperature of 20°C (69°F). The month is also characterized by high humidity at 87% and significant rainfall, with 273 mm (10.8 in) of precipitation over 17 days. In contrast, April offers cooler weather, with temperatures ranging from a minimum of -3°C (27°F) to a maximum of 25°C (78°F), and an average of 10°C (50°F). While April sees less rainfall, totaling 233 mm (9.2 in) over 13 days and lower humidity at 76%, it marks a transition into warmer months. For more detailed information, check out Gero weather in April.
In comparing the weather between September and May, September tends to be warmer with average temperatures around 20°C (69°F) and a maximum of 33°C (91°F), while May has milder conditions, averaging 15°C (60°F) and peaking at 29°C (84°F). Additionally, September experiences higher humidity levels at 87%, compared to May's 83%. Precipitation is also notably different; September sees a considerable 273 mm (10.8 in) across 17 days, whereas May has slightly less with 230 mm (9.1 in) over 14 days. For a more detailed look at the weather in Gero during May, you can refer to Gero weather in May.
September tends to be warmer than June, with an average temperature of 20°C (69°F) compared to June's 19°C (66°F). The maximum temperatures in September can reach up to 33°C (91°F), significantly higher than June's peak of 29°C (84°F). However, September experiences more precipitation, averaging 273 mm (10.8 in) over 17 days, whereas June sees slightly less rainfall at 246 mm (9.7 in) over 14 days. Interestingly, both months share the same high humidity level of 87%, contributing to a muggy atmosphere. For a detailed look at Gero's June weather, check out this link: Gero weather in June.
In comparing the weather of September and July, September shows a broader temperature range with minimums of 8°C (46°F) and maximums reaching up to 33°C (91°F), while July maintains a warmer climate with minimums at 15°C (59°F) and maximums peaking at 36°C (96°F). July also experiences significantly higher precipitation levels, with a total of 527 mm (20.8 in) over 25 days, compared to September's 273 mm (10.8 in) across 17 days. Additionally, the humidity remains slightly higher in July at 93%, compared to September’s 87%. For a detailed look at July weather, you can check Gero weather in July.
In comparing the weather conditions of September and August, September presents a notable drop in minimum temperatures, averaging 8°C (46°F) compared to August's minimum of 14°C (58°F). While the average temperature in September is 20°C (69°F), August maintains a warmer average of 24°C (76°F). Maximum temperatures in September reach up to 33°C (91°F), slightly lower than August's peak of 35°C (94°F). Precipitation patterns also differ; September experiences 273 mm (10.8 in) over 17 days, while August records higher precipitation at 316 mm (12.4 in) across 21 days. Humidity levels are relatively high in both months, with September at 87% and August at 91%. For more details, check out Gero weather in August.
September and October present a noticeable shift in weather patterns. September features a broader temperature range, with minimums around 8°C (46°F), averages at 20°C (69°F), and maximums reaching up to 33°C (91°F). This month also sees higher precipitation, totaling 273 mm (10.8 in) across 17 rainy days, along with humidity levels averaging 87%.
In contrast, October brings cooler temperatures, with minimums dropping to 3°C (38°F), average temperatures decreasing to 15°C (59°F), and maximums capping at 28°C (82°F). The overall precipitation in October is also slightly less, at 231 mm (9.1 in) over 14 days, and humidity remains relatively stable at 85%. For more detailed weather insights, you can check Gero weather in October.
September and November present a stark contrast in weather conditions. In September, temperatures range significantly from a cool minimum of 8°C (46°F) to a warm maximum of 33°C (91°F), with an average of 20°C (69°F). The month is also marked by high humidity at 87% and frequent rainfall, totaling 273 mm (10.8 in) over 17 days. In contrast, November brings much cooler temperatures, with minima dipping below freezing to -2°C (29°F) and a maximum of 19°C (67°F), averaging 8°C (47°F). Precipitation decreases sharply to 89 mm (3.5 in) over just 9 days, alongside a slightly lower humidity of 83%. For a detailed look at Gero's weather during this time, check out Gero weather in November.
September and December present stark contrasts in weather conditions. In September, temperatures can range from a cool 8°C (46°F) at night to a warm 33°C (91°F) during the day, with an average of 20°C (69°F). The month experiences high humidity at 87% and significant rainfall, totaling 273 mm (10.8 in) across 17 rainy days. On the other hand, December marks a considerable drop in temperatures, with lows plummeting to -4°C (24°F) and highs peaking at only 16°C (61°F), averaging around 3°C (38°F). Precipitation also decreases significantly to 103 mm (4.1 in) over 14 days, while humidity slightly lowers to 83%. This transition reflects the shift from late summer warmth to winter chill. For a detailed overview of December weather, you can check Gero weather in December.
As summer transitions into fall, September in Gero offers a unique weather experience that sets it apart from other months. While temperatures can soar to a sweltering 33°C, they often settle into a comfortable average of 20°C, providing a pleasant respite from the heat. However, with nearly half the month experiencing rainfall—totaling around 273 mm—it’s wise to be prepared for those damp days. The high humidity, hovering around 87%, adds a tropical feel, creating a lush environment. For a deeper understanding of how these conditions shape the landscape and overall climate, visit Gero Climate.