Last updated: August 21, 2025
September in Tokyo, Japan, is characterized by a warm and humid climate, with maximum temperatures soaring to 35°C (96°F) and an average of 24°C (75°F), offering an inviting atmosphere for tourists and locals alike. However, the month also brings a significant amount of rainfall, with a total precipitation of 186 mm (7.3 in) spread across 16 days, making it one of the wetter periods of the year. The humidity levels hover around 86%, adding to the tropical feel of the city. Visitors should be prepared for the occasional shower while enjoying the vibrant autumnal transition that September offers.
As September arrives in Tokyo, temperatures begin to show a refreshing shift from the sweltering heat of summer. With a minimum of 13°C (56°F), the cooler evenings offer a delightful respite, while daytime highs reach a warm 35°C (96°F). The average temperature settles comfortably at 24°C (75°F), making this month an ideal time for outdoor activities and exploration. Notably, the gradual decline in temperature marks the transition into autumn, signaling the onset of a more temperate climate perfect for enjoying the city's vibrant festivals and stunning fall foliage. The pleasant warmth, combined with the fading summer heat, creates an inviting atmosphere for both locals and visitors alike.
In September, Tokyo experiences a notable uptick in precipitation, with 186 mm (7.3 in) of rain falling over an average of 16 days. This represents a significant peak following the summer months, where rainfall is relatively lower—July, for instance, records 221 mm but is stretched over 17 days. The onset of autumn heralds a shift as weather patterns bring more consistent showers, making September one of the wetter months of the year. Following up after August’s 103 mm (4.1 in), the increase emphasizes the transition into the rainy season, paving the way for October's even heftier average of 273 mm (10.7 in). This pattern illustrates Tokyo's climate nuances, where summer's humidity gives way to fall's rain, enriching the city’s vibrant landscape.
In September, Tokyo experiences a notable humidity level of 86%, marking a slight decrease from the peak summer months of July and August, which saw humidities of 93% and 90%, respectively. This shift indicates the gradual transition towards autumn, where the intensity of summer's sweltering moisture begins to wane. Earlier months like May and June report higher humidity, but September still retains a significant dampness, leading to a unique blend of warm temperatures and moisture-laden air. As the city moves into the fall, residents can expect a refreshing change, though the lingering humidity serves as a reminder of the intense Japanese summer that began earlier in the year.
As September rolls in, Tokyo's UV Index remains notably high, measuring at 10, placing it in the "very high" exposure category. This trend indicates a slight dip from the extreme levels seen over the summer months, which consistently hovered at 11. However, with a burn time of just 15 minutes, it's crucial to remain vigilant even during early autumn. Throughout the year, as temperatures rise and sunlight intensifies, the UV Index shows a clear pattern: it escalates from a moderate 3 in January to peaks of 11 from May to August. As we transition into October, the index begins to decline, reminding residents and visitors to stay sun-smart and enjoy the beautiful Tokyo scenery while safeguarding their skin. For detailed insights, check out the Tokyo UV Index.
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As the vibrant summer days fade into autumn, September in Tokyo offers a delightful balance of sunshine. With 235 hours of sunlight, this month showcases a slight dip from the sun-drenched bliss of August, which boasts an impressive 288 hours. This trend of gradually decreasing daylight continues into October, with a further decline to 202 hours. September serves as a gentle reminder of the transition from the peak summer glow to the softer, more muted light of fall. The subtle shift in sunlight hours encapsulates the beauty of changing seasons, inviting residents and visitors alike to enjoy the lingering warmth before winter’s embrace takes hold.
As summer fades into autumn, the chances of sunny weather in Tokyo during September dip to 26%, indicating a shift from the sunnier months of July and August, which boast higher probabilities of sunshine. This low likelihood is part of a broader trend where the transition into fall often brings increased cloudiness and potential rainfall, following the vibrant and humid summer months. The sun’s presence in September pales in comparison to the brightness of earlier months, suggesting that while the city may start to cool down, it may also trade sunny skies for more overcast days. With the upcoming October showing a rebound to 49%, it's clear that September stands out as a transitional period, preparing the way for the clearer days of autumn ahead.
As summer transitions into autumn, September in Tokyo offers a balanced 12 hours of daylight, marking a subtle shift in the season's light. Following the peak summer months of July and August, where daylight lingered at 14 hours, September brings a gradual decline. This reduction is part of a broader trend where daylight duration decreases as the year progresses, from a generous 14 hours in June to just 9 hours in December. Notably, the daylight in September still outshines the early months of the year, such as January and February, both with just 10 hours. As the vibrant summer days fade, September serves as a gentle reminder that autumn is on the horizon, offering a beautiful blend of light that's perfect for enjoying the city's rich cultural experiences.
As summer transitions into autumn, the September wind in Tokyo brings a subtle change in its character, with an average speed of 3.2 m/s (7 mph)—a gentle breeze compared to the more robust winds of spring. This month marks a slight dip from the breeziness of May and August, hinting at the onset of cooler temperatures. Interestingly, September's wind speed is a continuation of the relatively mild breezes experienced during the earlier months of the year, such as January and June. As the city prepares for the fall season, the consistency of the wind speeds reflects a calm presence, perfectly complementing the vibrant colors and tranquil ambiance that envelops Tokyo during this time.
Weather in Tokyo varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Tokyo, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present drastically different weather patterns. In September, temperatures range from a mild 13°C (56°F) at night to a scorching 35°C (96°F) during the day, with an average temperature of 24°C (75°F). This month is also characterized by substantial rainfall, with 186 mm (7.3 in) of precipitation spread over about 16 days, contributing to high humidity levels of 86%. In contrast, January offers a stark chill, with temperatures plummeting to a minimum of -8°C (18°F) and averaging only 5°C (41°F), peaking at 18°C (65°F). The precipitation in January is significantly lower at 46 mm (1.8 in) over just 5 days, and the humidity is also reduced to 76%. For more details on January weather in Tokyo, you can visit Tokyo weather in January.
September typically boasts warmer temperatures, with averages around 24°C (75°F) and highs peaking at 35°C (96°F), creating a warm and humid atmosphere with 86% humidity. It is also a month with significant rainfall, experiencing about 186 mm (7.3 in) spread over 16 days. In contrast, February brings a stark change, with much cooler temperatures averaging about 6°C (43°F) and daily highs reaching up to 20°C (69°F). This month is characterized by significantly less precipitation, only 41 mm (1.6 in) over 7 days, and a drop in humidity to 74%. For more detailed information, you can check Tokyo weather in February.
September and March present distinct weather patterns. In September, temperatures range from a mild 13°C (56°F) to a sweltering 35°C (96°F), with an average of 24°C (75°F). This month also sees significant rainfall, totaling 186 mm (7.3 in) over 16 days and high humidity at 86%. In contrast, March offers a much cooler climate with temperatures spanning from a chilly -2°C (28°F) to a comfortable 23°C (73°F) and an average of 10°C (51°F). Precipitation in March is lower, amounting to 132 mm (5.2 in) over 12 days, with humidity at a more moderate 70%. For more detailed information, you can visit Tokyo weather in March.
September and April present contrasting weather conditions. In September, temperatures can reach a high of 35°C (96°F) with an average of 24°C (75°F), while April showcases much cooler averages, with highs of only 27°C (80°F) and an average of 14°C (58°F). Additionally, September experiences significant rainfall, totaling 186 mm (7.3 in) over 16 days, compared to April's lighter precipitation of 116 mm (4.6 in) over just 10 days. Humidity levels also differ markedly, with September at a humid 86% compared to April's more comfortable 74%. For more details on April's climate, check out Tokyo weather in April.
September and May present contrasting weather patterns. In September, temperatures range from a minimum of 13°C (56°F) to a scorching maximum of 35°C (96°F), with an average temperature of 24°C (75°F). The month is marked by significant rainfall, totaling 186 mm (7.3 in) over 16 days, and high humidity levels at 86%. In contrast, May offers milder conditions, with minimum temperatures of 8°C (46°F) and maximums reaching 31°C (88°F), resulting in a more temperate average of 20°C (68°F). Precipitation during May is also less, at 111 mm (4.4 in) over 11 days, accompanied by slightly lower humidity at 81%. For a detailed look at May weather in Tokyo, you can visit Tokyo weather in May.
In comparing the weather between September and June, September tends to be slightly warmer, with average temperatures ranging from 24°C (75°F) and highs reaching up to 35°C (96°F), while June has an average temperature of 23°C (73°F) and a maximum of 33°C (92°F). Precipitation is more frequent in September, with 186 mm (7.3 in) over 16 days, compared to June's 152 mm (6.0 in) across 13 days. Humidity is also notably high in both months, with September at 86% and June at 88%. For more detailed insights, you can check out Tokyo weather in June.
In comparison to July, September experiences slightly cooler temperatures, with average highs of 35°C (96°F) compared to July's peak of 39°C (103°F). The minimum temperature in September is also lower at 13°C (56°F), whereas July starts at a milder 18°C (64°F). Precipitation is notable in both months, with September receiving 186 mm (7.3 in) over 16 days, and July accumulating 221 mm (8.7 in) over 17 days. Additionally, humidity levels remain high in both months, with September at 86% and July reaching 93%. For more detailed information, you can check Tokyo weather in July.
In comparing the weather between September and August, September experiences slightly cooler temperatures, with daily averages dropping from 28°C (83°F) in August to 24°C (75°F). While both months have a similar number of rainy days, September receives significantly more precipitation at 186 mm (7.3 in) compared to August's 103 mm (4.1 in). Humidity levels are also comparable, remaining high in both months at 86% for September and 90% for August. This transition from August to September marks a gradual cooling, albeit with an increase in rainfall. For more detailed information, you can visit Tokyo weather in August.
September and October showcase a noticeable transition in weather patterns. In September, temperatures range from a minimum of 13°C (56°F) to a maximum of 35°C (96°F), with an average of 24°C (75°F). This month also experiences significant rainfall, totaling 186 mm (7.3 in) over 16 days, accompanied by high humidity at 86%. By October, the temperatures drop slightly, with a minimum of 8°C (47°F), an average of 19°C (66°F), and a maximum of 31°C (88°F). While October sees slightly fewer rainy days at 15, the total precipitation rises to 273 mm (10.7 in), and humidity remains relatively high at 83%. For more detailed insights, you can check the Tokyo weather in October.
In September, the weather is typically warm with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 35°C (96°F), averaging around 24°C (75°F). However, this month also brings considerable rainfall, with 186 mm (7.3 in) spread over 16 days and a humidity level of 86%. In contrast, November sees a significant drop in temperatures, with a minimum of 1°C (34°F), a maximum of 24°C (75°F), and an average temperature of 13°C (56°F). Precipitation decreases to 77 mm (3.0 in) over just 9 days, and humidity drops slightly to 80%. For a detailed look at November's climate, you can visit Tokyo weather in November.
In September, the weather is characterized by warm temperatures, with a minimum of 13°C (56°F), an average of 24°C (75°F), and highs that can reach up to 35°C (96°F). This month also experiences significant rainfall, totaling 186 mm (7.3 in) over about 16 days, accompanied by high humidity levels at 86%. In contrast, December brings a much cooler climate, with temperatures ranging from a minimum of -2°C (28°F) to an average of 8°C (46°F), and maximums of 21°C (70°F). Rainfall is notably less, at just 56 mm (2.2 in) spread across only 7 days, and humidity drops to 78%. For more details on December weather in Tokyo, check Tokyo weather in December.
As September unfolds in Tokyo, the weather starts to transition, providing a unique blend of late-summer heat and the onset of autumn's coolness. With temperatures reaching a maximum of 35°C (96°F) and an average around 24°C (75°F), the month can still feel quite warm, especially during the day. However, as the days shorten and humidity levels hover around 86%, the atmosphere becomes more comfortable. This month also sees a notable increase in rainfall, with approximately 186 mm (7.3 in) spread over around 16 days, marking a significant departure from the drier months of summer. For those looking to explore the city's vibrant culture against a backdrop of dynamic seasonal change, September offers a compelling experience. For more insights into weather trends, check out the comprehensive guide on Tokyo Climate.