Last updated: August 21, 2025
September in Atami, Japan brings a blend of warm temperatures and humid conditions. The maximum temperature can reach a sweltering 33°C (91°F), while the average hovers around a comfortable 23°C (74°F), providing a pleasant climate for visitors. Nighttime cools down to a refreshing 15°C (60°F). However, this month also sees significant rainfall, with a total precipitation of 221 mm (8.7 in) spread over 20 days, making it one of the wetter months. With humidity levels around 86%, the air feels quite moist, adding to the tropical ambiance of this coastal gem. Whether strolling along the beach or exploring local attractions, September offers a unique experience in Atami’s vibrant environment.
In September, Atami, Japan, experiences a delightful transition as summer begins to wane. With minimum temperatures around 15°C (60°F) and averages reaching 23°C (74°F), the warmth persists, making it a perfect time for outdoor activities. The maximum temperatures can soar to 33°C (91°F), reminiscent of the sweltering summer months. This month stands out with a notable balance: while days remain hot, evenings start to cool, hinting at the approach of autumn. September effectively bridges the hot summer and the cooler months ahead, inviting visitors to soak in the last rays of warm sunshine before the temperatures begin to dip in October.
In September, Atami, Japan, experiences a notable increase in precipitation, with an average of 221 mm (8.7 in) recorded over 20 days. This marks a peak in rainfall as summer gives way to autumn, following the heavy deluges of July and June. The consistent wet weather in September, characterized by nearly two-thirds of the month seeing rain, suggests a transition into a wetter autumn season. Compared to August’s 176 mm (6.9 in) and 17 rainy days, the September rain adds a refreshing, albeit sometimes overwhelming, touch to the landscape, preparing it for the further increases expected in October. As the days grow shorter and cooler, the rhythm of rainfall becomes a defining feature of the region, highlighting Atami’s unique climatic transitions.
In September, the humidity in Atami, Japan reaches 86%, marking a slight decrease from the sweltering months of summer, where July and August peaked at 93% and 90%, respectively. This month serves as a transition, as the intense heat begins to wane, yet the lingering humidity still envelops the city. Following June's high of 88%, September maintains a significant level of moisture in the air, creating a lush and vibrant atmosphere typical of late summer. As the year progresses, humidity levels gradually decline, with October already promising a drop to 83%. Overall, September stands out as a bridge between the oppressive summer months and the cooler, drier fall, capturing the essence of Atami's humid subtropical climate.
September in Atami, Japan, sees a UV Index of 10, categorizing it as very high and indicating a burn time of just 15 minutes for unprotected skin. This month maintains a trend of high UV levels typical of the late summer period, with the index slightly dropping from July's peak of 12 but remaining consistent with the extreme levels experienced in May through August. As autumn approaches, it's vital for residents and visitors alike to remain vigilant about sun protection, especially as the UV radiation still poses significant risks. To stay informed on UV conditions year-round, check out the detailed report at Atami UV Index.
UV Risk Categories
Nestled along Japan's coastline, Atami basks in September sunshine, capturing an impressive 236 hours of sunlight. This marks a slight dip from August's peak of 285 hours, signaling a gentle transition into the autumn months. Following a fulfilling summer, September still offers ample daylight, making it an ideal time for leisurely strolls along the beach or exploring the vibrant local culture. As the year wanes, daylight hours begin to fluctuate, with October dropping to 201 hours. This rhythm of brightness showcases Atami's unique charm, where each season brings its own blend of warmth and serenity.
In September, Atami, Japan experiences a 31% chance of sunny weather, a slight uptick compared to the sweltering summer months of July and August, which hover around 30% and 33% respectively. This transitional month marks the onset of autumn, where the sun's prevalence gradually begins to improve as the year progresses toward October's 44% likelihood. The data suggests a notable shift from the preceding summer's humidity—September offers a refreshing reprieve, making it an inviting time for visitors who appreciate pleasant weather to explore the scenic coastal town before the winter chill sets in. Although the chance of sunshine is modest, the allure of Atami’s hot springs and beautiful coastline remains undeniable.
As summer gracefully transitions into autumn in Atami, Japan, September shines with a delightful 12 hours of daylight. This marks a slight decline from the vibrant 14 hours enjoyed in the heart of summer, reflecting the inevitable shortening of days. As daylight gradually wanes, the months ahead will showcase a steady decrease, with October seeing 11 hours and November dropping to 10 hours. This gentle ebb of daylight not only signals the changing seasons but also invites a cozy atmosphere, perfect for savoring the rich hues of fall in this stunning coastal town.
As September arrives in Atami, Japan, the coastal winds begin to settle into a gentle rhythm, averaging 2.9 m/s (7 mph), similar to the breezy warmth of August. This marks a slight return to steadiness after the peak summer months, which saw some variability. The wind picks up slightly as the year progresses, with the transition into fall bringing a refreshing touch, hinting at the cooler months ahead. While January and December share the year's highest average wind speeds at 3.3 m/s (7 mph), September is part of a broader trend where the winds remain predominantly mild, contributing to Atami's picturesque charm as it shifts from the vibrant summer to the serene autumn. This gentle wind patterns invite serene strolls along the coastline, showcasing the beauty of the changing seasons.
Weather in Atami varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Atami, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present stark contrasts in weather conditions. In September, temperatures are much warmer, with minimums of 15°C (60°F) and maximums reaching up to 33°C (91°F), accompanied by high humidity levels at 86%. This month also sees significant rainfall, with 221 mm (8.7 in) of precipitation spread over 20 days. In contrast, January brings much cooler temperatures, with minimums dropping to -2°C (29°F) and maximums peaking at 18°C (64°F). The precipitation is significantly lower in January, totaling 68 mm (2.7 in) over just 5 days and with reduced humidity at 76%. For detailed insights into January weather, you can visit Atami weather in January.
In comparing September and February, the differences in weather are striking. September boasts warmer temperatures, with a minimum of 15°C (60°F) and an average of 23°C (74°F), peaking at 33°C (91°F). This month also experiences high humidity at 86% and significant rainfall, totaling 221 mm (8.7 in) over roughly 20 days. In contrast, February is much cooler, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 19°C (67°F). It has a lower average temperature of 7°C (45°F) and markedly less precipitation, with only 83 mm (3.2 in) falling across about 8 days and humidity at a moderate 74%. For more insights on winter conditions, check out Atami weather in February.
In September, the weather is significantly warmer and more humid compared to March. With temperatures ranging from a minimum of 15°C (60°F) to a maximum of 33°C (91°F) and an average of 23°C (74°F), September enjoys a vibrant summer-like atmosphere. However, it also brings frequent rain, with precipitation recorded on 20 days and a total of 221 mm (8.7 in). In contrast, March greets us with much cooler temperatures, where the minimum is 1°C (34°F) and the maximum reaches 22°C (72°F), averaging around 11°C (51°F). Rainfall in March is slightly less, with 196 mm (7.7 in) spread over 13 days and lower humidity at 70%. For a detailed look at the weather specifics in March, you can visit Atami weather in March.
In comparing the weather between September and April, September boasts significantly warmer temperatures, with averages reaching 23°C (74°F) and highs soaring up to 33°C (91°F). In contrast, April experiences much cooler conditions, with average temperatures only around 14°C (57°F), and highs peaking at 24°C (76°F). While both months see a fair amount of precipitation, September is notably wetter, receiving 221 mm (8.7 in) over 20 days compared to April's 168 mm (6.6 in) across just 11 days. Additionally, the humidity level in September is higher at 86%, compared to 74% in April. For more details on the April weather in Atami, you can visit Atami weather in April.
In comparing the weather between September and May, September tends to be significantly warmer, with average temperatures ranging from a minimum of 15°C (60°F) to a maximum of 33°C (91°F), whereas May sees cooler conditions with temperatures between 9°C (48°F) and 28°C (82°F). September is also marked by higher humidity at 86% and more precipitation, averaging 221 mm (8.7 in) over 20 days, compared to May's 194 mm (7.6 in) over just 12 days. This means September is a wetter month, while May offers a milder experience despite still having substantial rainfall. For a closer look at May's climate specifics, check out Atami weather in May.
September weather tends to be warmer overall compared to June, with average temperatures reaching 23°C (74°F) and maximums soaring to 33°C (91°F). In contrast, June typically sees a slightly lower average of 21°C (71°F) and a maximum of 29°C (85°F). However, both months are characterized by high humidity, with September at 86% and June slightly higher at 88%. While September experiences significant rainfall of 221 mm (8.7 in) over 20 days, June has even more precipitation, totaling 263 mm (10.3 in) across 17 days. For more specific details about June weather, you can refer to Atami weather in June.
In comparing the weather of September and July, we observe that July tends to be slightly warmer, with average temperatures around 25°C (77°F) compared to September's 23°C (74°F). Both months share similar maximum temperatures of 33°C (91°F), but July boasts a higher minimum temperature of 18°C (65°F) versus September's 15°C (60°F). Rainfall is significantly heavier in July, with 326 mm (12.8 in) over 19 days, compared to September’s 221 mm (8.7 in) across 20 days. Additionally, humidity levels are higher in July at 93%, compared to September's 86%. For more details, check out Atami weather in July.
In comparison to August, September experiences slightly cooler temperatures, with a minimum of 15°C (60°F) and an average of 23°C (74°F), compared to August's minimum of 20°C (68°F) and average of 27°C (81°F). While both months are humid, September has a humidity level of 86%, which is just a bit lower than August's 90%. Additionally, September sees increased rainfall, totaling 221 mm (8.7 inches) over 20 days, compared to August's 176 mm (6.9 inches) over 17 days. For more insights on August conditions, visit Atami weather in August.
September and October present notable differences in weather patterns. In September, temperatures range from a minimum of 15°C (60°F) to a maximum of 33°C (91°F), with an average of 23°C (74°F). The month experiences significant rainfall, with 221 mm (8.7 in) of precipitation occurring over 20 days and high humidity at 86%. In contrast, October sees cooler temperatures, dipping to a minimum of 11°C (52°F) and averaging 19°C (66°F), peaking at 29°C (84°F). Precipitation increases to 305 mm (12.0 in), spread over 16 days, but humidity slightly decreases to 83%. For more detailed insights on October weather, visit Atami weather in October.
September and November present quite contrasting weather patterns. In September, temperatures soar with a minimum of 15°C (60°F) and an average of 23°C (74°F), peaking at a hot 33°C (91°F). The month is also quite rainy, recording 221 mm (8.7 in) of precipitation over 20 days, coupled with high humidity levels around 86%. In stark contrast, November cools down significantly, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 22°C (72°F) and an average of 14°C (58°F). The precipitation drops to 94 mm (3.7 in) over just 10 days, and humidity decreases slightly to 80%. For a more detailed look at November's climate, check out Atami weather in November.
September and December exhibit stark contrasts in weather patterns. September enjoys warm temperatures, with averages around 23°C (74°F) and highs reaching up to 33°C (91°F). However, it is also a month marked by significant rainfall, experiencing about 221 mm (8.7 in) over 20 days, and high humidity levels at 86%. In contrast, December brings a much cooler climate, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 21°C (69°F) and an average of only 9°C (49°F). Rainfall is significantly reduced in December, totaling 74 mm (2.9 in) over just 8 days, along with lower humidity at 78%. For more detailed insights about December weather, visit Atami weather in December.
September in Atami ushers in a unique blend of warmth and moisture, offering a transition from the intense summer heat to the milder autumn days. While the average temperature remains comfortably warm, the significant humidity and a higher rate of precipitation can create a lush, vibrant environment that differs from the drier summer months. This month experiences more rainy days, making it essential for visitors to prepare for unexpected showers. The stunning coastal views and the lush landscape are enhanced by this change in weather, inviting travelers to experience Atami's beauty in a new light. For more detailed insights on the climatic conditions throughout the year, check out Atami Climate.