Last updated: August 21, 2025
In September, Shimabara experiences a vibrant transition into autumn, with average temperatures hovering around a comfortable 25°C (78°F). The month can see maximum highs reaching up to 35°C (94°F), while cooler nights can dip to 16°C (62°F). Rainfall is significant, with 228 mm (9.0 in) of precipitation spread over 15 days, contributing to a lush landscape. Humidity levels peak at a notable 84%, creating a tropical feel that enhances the regional charm. This dynamic weather sets the stage for both local culture and nature to thrive, making September a captivating time to explore Shimabara.
September in Shimabara, Japan marks a transition into milder temperatures, providing a refreshing reprieve from the sweltering summer heat. With a minimum temperature averaging 16°C (62°F) and a comfortable average of 25°C (78°F), the weather is ideal for outdoor explorations. The maximums can soar to 35°C (94°F), reminiscent of the peak summer months, but the overall trend indicates a gradual cooling as autumn approaches. As daylight lingers, this month becomes a delightful time to enjoy the vibrant nature and cultural festivities, making it a perfect period for visitors to immerse themselves in Shimabara’s scenic beauty.
In September, Shimabara experiences a noticeable transition as summer wanes and autumn approaches, reflected in its precipitation levels. With an impressive 228 mm (9.0 in) of rainfall over 15 days, September stands out as a month of moderate wetness, following the heavy rains of July and August. This period marks a dip in precipitation compared to the peak summer months, yet it remains substantial enough to nourish the lush landscapes that characterize the region. The trend of increasing rainfall from January’s modest 53 mm to June’s peak of 262 mm begins to flatten, suggesting a gradual shift toward drier conditions as the year progresses. This transition is crucial for local agriculture, as the balance of moisture supports both crop growth and water resources heading into the cooler months.
As summer fades into fall, September in Shimabara, Japan, experiences a noticeable shift in humidity, with levels averaging around 84%. This marks a slight decline from the sweltering highs of 92% in July and 91% in August, yet it remains comfortably above the yearly average. Throughout the year, the trend showcases a gradual increase in humidity from 71% in the early months to its peak during summer, before gently tapering off as autumn approaches. This transition not only brings relief from the intense summer heat but also sets the stage for the crispness of October, which follows closely at 83%. The fluctuating humidity levels reflect the changing seasons, enhancing Shimabara's rich atmospheric charm.
As September rolls into Shimabara, Japan, the UV Index remains high at 11, reflecting an extreme exposure category. This marks a continuation of the summer trend, where both July and August also recorded a peak UV Index of 12. Shifting from the intense summer sun to early autumn, residents and visitors can expect a burn time of just 10 minutes if unprotected. Although conditions begin to ease in October with a drop to 7 and a shift to the high exposure category, September underscores the importance of sun protection during the lingering summer warmth. For more detailed insights, check the Shimabara UV Index.
UV Risk Categories
As September rolls into Shimabara, Japan, the city basks in a warm 257 hours of sunshine, continuing the summer's vibrant glow. This month marks a gentle transition from the intense 300 hours of August, signaling the gradual shift towards autumn. Interestingly, while September enjoys more sunlight than the winter months, such as 180 hours in January and 216 hours in December, it showcases a notable decrease from the peak summer days. This pattern underscores how Shimabara's climate offers a delightful balance, with each month presenting its unique charm—offering an inviting playground for outdoor activities before the colder months set in.
In September, Shimabara, Japan, experiences a 34% chance of sunny weather, which represents a slight increase compared to the summer months, but still falls short of the more promising conditions that autumn brings. While the summer's peak months, July and August, see the sun less frequently with only a 20% and 27% chance respectively, the likelihood of sunshine starts to rise again as the region transitions into fall. Notably, October enjoys a robust 64% chance, suggesting that as the season progresses, the residents and visitors of Shimabara can anticipate brighter days ahead after the comparatively overcast summer.
As summer fades, Shimabara, Japan, experiences a gentle transition in daylight duration throughout September, boasting 12 hours of daylight. This trend marks a subtle decline from the 14 hours enjoyed in the peak of summer, echoing the gradual shift towards autumn. Notably, this month serves as a bridge, where days remain warm and vibrant before yielding to the shorter daylight hours of October, which offers just 11 hours. The progression from the long summer days of June and July to the diminishing light of autumn invites residents and visitors alike to savor the mellow beauty and shifting landscapes that September brings.
In Shimabara, Japan, the gentle breezes of September bring a noticeable shift in the wind speed, averaging just 2.3 m/s (5 mph). This marks a decline from the earlier summer months, where gusts typically reach between 2.5 and 2.7 m/s (6 mph). The cooling transition from the warm summer days appears to soften the winds, echoing the gradual change of the season. As autumn begins to set in, the lowest average wind speed for the year suggests a tranquil period, inviting residents and visitors alike to enjoy the serene ambiance of this coastal town. In contrast, January sees a slight increase in wind speed, starting the year at 3.0 m/s (7 mph), hinting at the seasonal variability that characterizes Shimabara's climate.
Weather in Shimabara varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Shimabara, focusing on differences in temperature, rainfall, humidity, and UV levels.
September weather contrasts sharply with January, showcasing a significant shift in temperature and precipitation. In September, temperatures range from a mild 16°C (62°F) at night to a sweltering 35°C (94°F) during the day, coupled with high humidity levels at 84% and substantial rainfall of 228 mm (9.0 in) over 15 days. In contrast, January's climate is much cooler, with temperatures dipping as low as -2°C (29°F) at night and peaking at 19°C (66°F) in the daytime. This winter month experiences only 53 mm (2.1 in) of precipitation over just 6 days and has a lower humidity level of 75%. For more detailed weather insights, you can check Shimabara weather in January.
September and February present stark contrasts in weather patterns. September boasts warmer temperatures, with a minimum of 16°C (62°F) and an average high of 35°C (94°F), creating a sultry atmosphere, especially with the high humidity of 84%. This month also sees significant rainfall, averaging 228 mm (9.0 in) across 15 days. In contrast, February experiences much cooler temperatures, with a minimum of -2°C (29°F) and an overall average of just 8°C (48°F). The precipitation is noticeably lower at 92 mm (3.6 in) over 9 days, and the humidity levels drop to 71%. For more detailed insights on February weather, you can visit Shimabara weather in February.
When comparing the weather in September and March, there is a stark contrast in temperatures and precipitation levels. September typically boasts warmer temperatures, with a minimum of 16°C (62°F) and an average of 25°C (78°F), reaching a high of 35°C (94°F). In contrast, March features much cooler weather, with a minimum of 3°C (37°F), an average of 12°C (55°F), and a maximum of 24°C (76°F). In terms of precipitation, September experiences more rain, totaling 228 mm (9.0 in) over approximately 15 days, whereas March receives about 145 mm (5.7 in) over 11 days. Additionally, the humidity is higher in September at 84%, compared to 71% in March. For a detailed look at March weather specifics in Shimabara, you can visit Shimabara weather in March.
The weather in September is characterized by warmer temperatures, with minimums around 16°C (62°F) and averages peaking at 25°C (78°F), reaching maximums of 35°C (94°F). In contrast, April experiences much cooler temperatures, starting at a minimum of 5°C (41°F) and averaging 16°C (62°F), with highs reaching up to 29°C (84°F). Precipitation is also more abundant in September, with 228 mm (9.0 in) spread over 15 days, compared to April's 135 mm (5.3 in) over just 8 days. Additionally, September's humidity is slightly higher at 84%, compared to April's 78%. For more detailed insights about April weather, visit Shimabara weather in April.
In comparing the weather of September and May, we see notable differences in temperature and precipitation. September typically experiences warmer weather, with daytime averages around 25°C (78°F) and maximum temperatures reaching up to 35°C (94°F). In contrast, May has milder temperatures, averaging 21°C (69°F) with a maximum of 30°C (86°F). Both months have high humidity levels at 84%, but September receives slightly more rainfall, with 228 mm (9.0 in) over 15 days compared to May's 214 mm (8.4 in) over 12 days. For more details on May weather, you can check Shimabara weather in May.
In comparing the weather conditions of September and June, both months display a similar range of temperatures, with September experiencing a minimum of 16°C (62°F) and an average of 25°C (78°F), while June has a slightly lower average of 24°C (75°F) but the same minimum. September tends to be more rain-prone, with a total precipitation of 228 mm (9.0 in) over 15 days, contrasted with June's higher precipitation of 262 mm (10.3 in) also over 15 days. The humidity levels in September average around 84%, slightly lower than June's 86%, creating a similarly humid atmosphere in both months. For more details on June weather specifically, you can check out this link: Shimabara weather in June.
In comparing the weather between September and July, July tends to be hotter, with average temperatures reaching up to 27°C (82°F) and maximums soaring to 37°C (99°F). In contrast, September offers slightly cooler conditions, with average temperatures of 25°C (78°F) and maximums reaching 35°C (94°F). However, July experiences significantly higher precipitation, recording 475 mm (18.7 in) over 19 days, compared to September's 228 mm (9.0 in) over 15 days. Humidity levels are also higher in July at 92%, while September sees a somewhat lower humidity of 84%. For more detailed information, you can check Shimabara weather in July.
In comparing the weather of September and August, it's clear that September experiences slightly cooler temperatures, with a minimum of 16°C (62°F) and a maximum of 35°C (94°F), averaging 25°C (78°F). In contrast, August boasts higher temperatures, starting at a minimum of 20°C (68°F) and peaking at 39°C (102°F), with an average of 29°C (85°F). Precipitation is more abundant in August, totaling 303 mm (11.9 in) over 14 days, compared to September's 228 mm (9.0 in) spread across 15 days. Humidity levels remain high in both months, with August reaching 91% and September slightly lower at 84%. For more detailed insights on August weather, you can visit Shimabara weather in August.
September and October exhibit notable shifts in weather patterns. September sees warmer temperatures, with a minimum of 16°C (62°F) and an average of 25°C (78°F), reaching a maximum of 35°C (94°F). In contrast, October experiences cooler conditions, with temperatures dropping to a minimum of 10°C (50°F) and an average of 21°C (69°F), peaking at 33°C (91°F). Precipitation decreases significantly from 228 mm (9.0 in) over 15 days in September to 120 mm (4.7 in) across just 9 days in October, indicating a trend towards drier weather as fall progresses. The humidity remains relatively stable, slightly lower in October at 83% compared to September's 84%. For a detailed look at October weather, visit Shimabara weather in October.
September and November exhibit notable differences in weather patterns. September boasts warmer temperatures, with a minimum of 16°C (62°F) and an average high reaching 35°C (94°F), while humidity remains high at 84%. The month experiences significant rainfall, totaling 228 mm (9.0 in) over approximately 15 days. In contrast, November brings cooler conditions with a minimum temperature of 3°C (38°F) and a maximum of 25°C (78°F), averaging around 15°C (59°F). Precipitation is significantly lower, at 80 mm (3.1 in) over just 8 days, and humidity declines slightly to 81%. For more specific details about the weather in November, you can visit Shimabara weather in November.
In September, the weather is characterized by warmer temperatures, with minimums around 16°C (62°F) and averages reaching up to 25°C (78°F), peaking at a sweltering 35°C (94°F). This month also experiences significant rainfall, with about 228 mm (9.0 in) falling over 15 days and a high humidity level of 84%. In contrast, December brings a noticeable drop in temperatures, featuring a minimum of 0°C (33°F) and an average of only 10°C (49°F), though the maximum can still reach 24°C (76°F). Precipitation decreases substantially to 89 mm (3.5 in) over just 7 days, with humidity slightly lower at 79%. For more details on what to expect during this colder month, check out Shimabara weather in December.
As September unfolds in Shimabara, the weather begins to shift, offering a unique blend of warmth and moisture that sets it apart from the preceding summer months. With an average temperature that hovers around a pleasant 25°C (78°F), the heat peaks at a sweltering 35°C (94°F), making it a time when late summer's warmth lingers before the cooler autumn breezes arrive. However, this warm atmosphere is accompanied by an increased level of humidity, reaching 84%, and a noticeable uptick in rainfall, with 228 mm of precipitation over about 15 days. These conditions create a vibrant and lush landscape, distinguishing September as a month where summer's end meets the whispers of autumn. For more insights on Shimabara’s weather patterns, visit Shimabara Climate.