Last updated: August 21, 2025
September in Yokohama, Japan showcases a delightful blend of mild temperatures and refreshing rainfall. With a maximum temperature reaching 28°C (82°F) and an average of 20°C (69°F), the climate is comfortable yet vibrant. The month experiences a minimum temperature of 14°C (57°F), perfect for light layering during cooler evenings. However, residents and visitors should prepare for some rain, as 113 mm (4.5 in) of precipitation falls over 12 days, contributing to a humid atmosphere with levels around 89%. This combination of warmth and moisture makes September an enchanting month to experience the rich beauty of Yokohama’s parks and waterfronts.
In September, Yokohama experiences a gentle transition towards autumn, characterized by milder temperatures that invite both locals and tourists alike to enjoy the city's vibrant atmosphere. The month begins with lows around 14°C (57°F) and averages a comfortable 20°C (69°F) during the day, peaking at a pleasant 28°C (82°F). This marks a step down from the heat of summer, yet still retains warmth, setting the stage for outdoor activities and festivals. As the month progresses, the gradual decline in maximum temperatures signals the arrival of cooler days ahead, hinting at the crispness of October. The overall climate, with its moderate humidity, creates an inviting backdrop for exploring everything Yokohama has to offer, from its beautiful waterfront to its rich cultural scene.
In September, Yokohama experiences a notable shift in its precipitation patterns, with 113 mm (4.5 in) of rainfall recorded over 12 days. Following the intense downpour of 203 mm (8.0 in) in August, the slightly reduced rainfall indicates a transition toward the drier months ahead. This month bridges the gap between the peak summer rains and the wetter October, which sees a marked increase to 168 mm (6.6 in). The weather in September strikes a balance, offering a blend of lingering summer humidity and the onset of autumnal changes, as the city prepares for the upcoming seasonal shifts. This gradual transition from the peak rainy season is characteristic of Yokohama’s climate, showcasing its dynamic precipitation trends throughout the year.
As summer gives way to autumn, September in Yokohama reveals a noticeable shift in humidity levels. The month starts off with an average humidity of 89%, a decrease from the sizzling highs of 97% in August but still reflecting the lingering warmth. This trend highlights a gradual transition, as the city moves away from its peak summer humidity and prepares for the more comfortable conditions of October, which sees a further drop to 81%. Overall, September serves as a bridge, capturing the essence of late summer's warmth while hinting at the drier and cooler days ahead.
In September, Yokohama experiences a UV Index of 8, categorized as very high, with a burn time of just 15 minutes. This reflects a slight decrease from the extreme levels seen in August, where the index peaked at 11, indicating a transition from the intense summer sun. As autumn approaches, the UV Index remains notably high, suggesting that while temperatures may cool, UV exposure should not be taken lightly. It's essential to stay vigilant and protect your skin during this time. For more detailed insights on UV levels throughout the year, you can refer to the Yokohama UV Index.
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As summer makes its graceful exit, September in Yokohama continues to bask in a warm glow with 256 hours of sunshine. This marks a gentle decline from the sunny peak of 294 hours in May, but the month still enjoys more daylight than many others in the year. Following the vibrant sun-soaked days of July and August, September's sunshine is a comforting transition into autumn, maintaining a brightness that suggests lingering warmth. This trend of abundant sunlight gradually tapers off into the cooler months ahead, with October’s sunshine dropping to 226 hours. The overall pattern shows a strong summer influence, making September a delightful time for outdoor activities before the crispness of fall takes over.
In Yokohama, Japan, September experiences a noteworthy 42% chance of sunny weather, making it one of the more promising months for sunshine compared to the preceding summer. This uptick in sunny days marks a delightful transition, as the sweltering August—plagued by a lower 25% chance of sun—gives way to milder days. As autumn approaches, the likelihood of clear skies remains relatively strong, juxtaposed against a backdrop of fluctuating forecasts throughout the year. Overall, September stands out as a charming time to enjoy the outdoors, embracing the warm hues of early fall while basking in the sun.
In Yokohama, Japan, September marks a gentle transition in daylight duration as summer wanes, offering about 12 hours of daylight. This gradual decrease from the longer days of summer—where June boasts a peak of 15 hours—signals the approach of autumn. As daylight gradually shortens into October, the city's residents can enjoy the remaining warmth and brightness before the darker months set in. From January’s 9 hours to May's 14, daylight duration fluctuates significantly throughout the year, creating a rhythmic cadence that influences daily life, outdoor activities, and seasonal moods. As September draws the line between summer's abundance and autumn's embrace, it serves as a reminder of nature's evolving patterns.
As September arrives in Yokohama, the gentle embrace of the wind brings a noticeable shift in the air. With an average wind speed of 5.2 m/s (12 mph), it marks a slight dip from the summer months, reflecting a transition towards the cooler autumn breezes. This calming air follows a pattern seen throughout the year, where wind speed tends to fluctuate; notably, the spring months witness a peak in brisk winds. Notably, the warm, summer winds slow down with September's arrival, creating a serene atmosphere that hints at the seasonal change ahead. As the year progresses, the winds will gradually regain strength, particularly with the return of November's gustier days. Overall, September's winds create a peaceful yet dynamic backdrop for Yokohama, inviting residents and visitors alike to enjoy the beauty of this transitional month.
Weather in Yokohama varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Yokohama, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is significantly warmer, with temperatures ranging from a minimum of 14°C (57°F) to a maximum of 28°C (82°F), while January experiences much colder conditions, with temperatures dipping as low as -7°C (19°F) and peaking at only 8°C (46°F). September also sees higher humidity levels at 89% and substantial rainfall, accumulating to 113 mm (4.5 in) over approximately 12 days, compared to January's lower humidity of 79% and slightly less precipitation of 97 mm (3.8 in) over 19 days. For more detailed information, check out Yokohama weather in January.
September and February present starkly contrasting weather conditions. In September, temperatures are mild, ranging from a minimum of 14°C (57°F) to a comfortable average of 20°C (69°F), peaking at a warm 28°C (82°F). However, this month also brings a fair amount of rainfall, with approximately 113 mm (4.5 in) of precipitation spread over 12 days, and a high humidity level of 89%.
In contrast, February is noticeably colder, with temperatures dropping significantly to a minimum of -7°C (20°F) and an average of just 0°C (33°F), while the maximum temperature reaches only 8°C (46°F). Although February sees slightly less precipitation at 108 mm (4.3 in), it occurs over more days, totaling 21 days, accompanied by lower humidity levels at 78%.
For more detailed insights into February weather, you can check Yokohama weather in February.
In September, temperatures range from a mild 14°C (57°F) at night to a warm average of 20°C (69°F) during the day, peaking at 28°C (82°F). The month experiences higher humidity levels at 89% and receives 113 mm (4.5 in) of precipitation over 12 days. In contrast, March brings a much colder climate, with nighttime lows plummeting to -4°C (26°F) and daytime highs only reaching around 14°C (58°F), resulting in an average temperature of 4°C (40°F). While March has slightly less precipitation at 89 mm (3.5 in), it is spread over 14 days, leading to a humidity level of 77%. For more details on the weather during this month, you can visit Yokohama weather in March.
Comparing the weather in September and April reveals notable differences in temperature and humidity levels. In September, temperatures range from a minimum of 14°C (57°F) to a maximum of 28°C (82°F), with an average of 20°C (69°F). This month is characterized by relatively high humidity at 89% and a notable amount of precipitation, measuring 113 mm (4.5 in) over 12 days. In contrast, April is much cooler, with temperatures ranging from 1°C (34°F) to 18°C (64°F) and an average of just 8°C (46°F). Though April experiences slightly less precipitation at 99 mm (3.9 in) over 13 days, the humidity is lower at 78%. For a more detailed look at what to expect, check out Yokohama weather in April.
In comparing the weather of September and May, September tends to be warmer, featuring an average temperature of 20°C (69°F) and highs reaching up to 28°C (82°F). In contrast, May has a cooler average temperature of 12°C (55°F) and a maximum of 23°C (74°F). Precipitation levels are relatively close, with September receiving 113 mm (4.5 inches) over 12 days and May slightly lower at 101 mm (4.0 inches) over the same number of days. Both months experience high humidity, but September's humidity is marginally higher at 89%, compared to May's 86%. For more details on May weather, you can refer to Yokohama weather in May.
September and June exhibit distinct weather patterns, reflecting the transition from summer to early autumn. In September, temperatures range from a minimum of 14°C (57°F) to a maximum of 28°C (82°F), with an average of 20°C (69°F). The month experiences 113 mm (4.5 inches) of precipitation over 12 days, and humidity levels are relatively high at 89%. In contrast, June sees slightly cooler temperatures, with a minimum of 11°C (51°F), an average of 16°C (61°F), and a maximum of 24°C (76°F). Precipitation in June is marginally higher at 123 mm (4.9 inches), also over 12 days, accompanied by an even higher humidity level of 91%. Overall, September tends to be warmer and slightly drier than June. For more detailed information, check Yokohama weather in June.
In comparing the weather of September and July, both months share similar temperature ranges, with minimums of 14°C (57°F), averages of 20°C (69°F), and maximums of 28°C (82°F for September and 83°F for July). However, July tends to be slightly wetter, with 128 mm (5.0 in) of precipitation over 13 days, compared to September's 113 mm (4.5 in) across 12 days. Additionally, humidity levels are higher in July at 95%, while September sees a lower humidity of 89%. For more details, you can check out Yokohama weather in July.
Comparing the weather in September and August reveals some notable differences. In September, temperatures tend to be slightly cooler, with a minimum of 14°C (57°F) and an average of 20°C (69°F), compared to August's minimum of 17°C (63°F) and average of 22°C (72°F). Additionally, September experiences less precipitation, totaling 113 mm (4.5 in) over 12 rainy days, whereas August sees a significantly higher rainfall of 203 mm (8.0 in) over 15 days. The humidity is also slightly lower in September at 89%, down from August's 97%, contributing to a more comfortable atmosphere. For more detailed information, you can check Yokohama weather in August.
In September, the weather features warmer temperatures, with a minimum of 14°C (57°F) and a maximum of 28°C (82°F), while the average hovers around 20°C (69°F). The month experiences substantial precipitation, totaling 113 mm (4.5 in) over 12 days, with a high humidity level of 89%. In contrast, October sees a noticeable drop in temperature, with a minimum of 8°C (47°F) and an average maximum of 25°C (77°F), bringing the average down to 16°C (60°F). Precipitation increases to 168 mm (6.6 in) over 13 days, yet humidity decreases slightly to 81%. For more detailed insights, check the statistics and trends at Yokohama weather in October.
September typically showcases warmer temperatures, ranging from a minimum of 14°C (57°F) to a maximum of 28°C (82°F), with an average of 20°C (69°F). This month experiences a higher level of humidity at 89% and sees 113 mm (4.5 in) of precipitation spread over 12 days. In contrast, November brings a notable drop in temperature, with a minimum of 0°C (32°F) and a maximum of 17°C (63°F), averaging around 9°C (49°F). Although November has slightly less precipitation at 94 mm (3.7 in), it spans over more days, occurring on 17 days, and comes with lower humidity levels at 78%. For more detailed information, you can check Yokohama weather in November.
In September, the weather is typically warm and humid, with average temperatures around 20°C (69°F) and highs reaching up to 28°C (82°F). Rain is common, with about 113 mm (4.5 in) of precipitation over roughly 12 days, contributing to a humid atmosphere with an average humidity of 89%. In contrast, December brings much colder conditions, with average temperatures dropping to around 3°C (38°F) and maximums reaching only 14°C (58°F). Precipitation increases to 151 mm (6.0 in), spread over 26 days, while humidity levels decrease to 77%. For a more detailed look at the December weather in Yokohama, you can visit Yokohama weather in December.
As summer transitions to autumn, September in Yokohama brings a delightful mix of warm temperatures and refreshing humidity, creating a comfortable yet slightly moist atmosphere. The weather is marked by average temperatures hovering around a pleasant 20°C, with highs reaching 28°C, allowing for enjoyable outdoor activities before the cooler months set in. While precipitation makes its presence felt with about 12 days of rain, it is a crucial part of the local climate, fostering lush landscapes and vibrant scenery. This month stands out from others with its unique balance of warmth and moisture, perfect for exploring the city's rich offerings. For more insights on what to expect throughout the year, check out the details at Yokohama Climate.