Last updated: August 21, 2025
In Sendai, Japan, September presents a blend of warm days and cooler nights, with maximum temperatures reaching up to 33°C (92°F) and an average of 21°C (69°F). As summer transitions to autumn, temperatures can dip to a minimum of 8°C (47°F), offering refreshing evenings. This month sees approximately 150 mm (5.9 in) of precipitation over 14 rainy days, contributing to the city's lush greenery. Coupled with a high humidity level of 86%, September in Sendai showcases the delicate balance of vibrant days and the soft whisper of seasonal change, inviting both locals and visitors to experience its unique charm.
In September, Sendai transitions into a warm embrace of autumn, showcasing a refreshing blend of temperatures. With lows around 8°C (47°F) and average highs reaching 33°C (92°F), this month offers a comfortable climate for outdoor activities. The average temperature of 21°C (69°F) strikes an inviting balance, making it ideal for exploring the picturesque landscapes and vibrant cultural festivals. As the summer heat begins to fade, September's weather invites both locals and tourists to enjoy the mild, sunny days, making it a beautiful time to experience the charm of Sendai.
September in Sendai, Japan, marks a noteworthy transition in the rainfall pattern, as the total precipitation reaches 150 mm (5.9 in) over 14 days. This is part of a broader trend observed in the summer months, where the city experiences significant rainfall, with both July and August exceeding 200 mm. Interestingly, after the peak summer downpours, September's precipitation is a bit of a dip, yet it remains relatively high compared to the other months. The steady rainfall contributes to the lush greenery and vibrant landscapes that define Sendai during this time, making it a refreshing yet gloomy experience as the city begins its shift towards autumn.
As summer transitions into autumn, September in Sendai, Japan, experiences a notable shift in humidity, settling at 86%. This represents a slight drop from the 92% levels observed in the peak of July and August, though it remains significantly higher than the drier months of April and May, which hover around 75% to 80%. The air retains a noticeable moisture, hinting at the lingering warmth of summer, yet begins to offer a more comfortable atmosphere as the region prepares for cooler October days. This seasonal ebb and flow illustrates Sendai's humid subtropical climate, where the warm, humid summers gradually yield to milder, more pleasant fall conditions.
As September rolls in, Sendai experiences a notable shift in its UV Index, showcasing a very high level of 9, which calls for caution during outdoor activities. This marks a decline from the extreme levels of UV exposure seen in July and August, where the Index peaked at 11. Despite this decrease, residents and visitors alike still need to be vigilant, as the burn time remains at a brisk 15 minutes. With a consistent trend of increasing UV levels from early spring to late summer, September serves as a reminder of the sun's lingering strength as the season transitions. For more detailed insights and guidance regarding UV exposure, check out Sendai UV Index.
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September in Sendai, Japan, gracefully transitions from the vibrant summer months into the cooler embrace of autumn, showcasing 247 hours of sunshine. This marks a gentle decline from the peak of 292 hours in May, indicative of the shifting seasons. As summer's warmth lingers, September still holds onto a generous amount of sunlight, standing out against the backdrop of the year’s earlier months, with hours gradually diminishing toward winter. The trend reflects a gradual decrease from the summer's lush radiance, making September an ideal time to enjoy the picturesque landscapes bathed in golden light, before the chill sets in for the year.
In Sendai, Japan, September offers a moderate chance of sunny weather, with only 29% likelihood of sunshine compared to the rest of the year. This month transitions from the humid summer, where sunshine dips to its lowest in July and August at just 21%. As autumn approaches, September struggles to achieve the clearer skies that begin to re-emerge in October, which boasts a better 38% chance of sun. The rising chances of sun in the following months, particularly November at 55%, hint at the shift in weather patterns, making September a transitional period where sunny days are less frequent but still possible.
As September arrives in Sendai, Japan, the daylight hours reflect the gradual transition from the long, sunlit days of summer to the crispness of autumn. With 12 hours of daylight, September marks a slight decline from the summer peak of 14 hours experienced in June through August. This month acts as a bridge, maintaining plenty of light for outdoor activities while hinting at the shorter days to come. As the year wanes, daylight gradually dwindles, tapering down to 11 hours in October and ultimately returning to 9 hours by December. This rhythmic fluctuation not only shapes the environment but also influences the local lifestyle, as residents relish the lingering warm sunlight before the colder months set in.
As September unfolds in Sendai, Japan, the gentle caress of the wind graces the landscape, averaging a soft 2.3 m/s (5 mph). This marks a slight uptick from the languid breezes of summer, which consistently hovered around 2.1 m/s in June and 1.9 m/s in July. The transition into autumn signals a subtle revival of wind activity, in stark contrast to the year's seasonal lull. Interestingly, this month’s average remains consistent with the trends observed in August, where whispers of wind were notably calmer. As the days grow shorter, the steadied breeze foreshadows the invigorating winds of fall, setting the stage for October's promise of a slightly brisker atmosphere at 2.4 m/s. This harmonious ebb and flow of wind speeds reflects the enchanting rhythm of nature, inviting residents and visitors alike to embrace the changing seasons in Sendai.
Weather in Sendai varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sendai, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present striking contrasts in weather. In September, temperatures range from a mild 8°C (47°F) to a warm 33°C (92°F), with an average of 21°C (69°F). The month experiences significant precipitation, totaling 150 mm (5.9 in) over about 14 days, alongside relatively high humidity at 86%. In contrast, January sees much colder conditions, with temperatures plummeting to a minimum of -10°C (14°F) and peaking at 11°C (52°F); the average temperature is a frigid 0°C (33°F). Precipitation is less frequent, with 65 mm (2.6 in) over 13 days, and humidity is lower at 80%. For more detailed information on January weather, you can check Sendai weather in January.
September and February present starkly contrasting weather conditions. In September, temperatures range from a mild 8°C (47°F) at night to a warm 33°C (92°F) during the day, with an average of 21°C (69°F). This month also experiences considerable rainfall, with 150 mm (5.9 in) spread over 14 rainy days and humidity levels reaching 86%. In contrast, February is characterized by much colder temperatures, with a minimum of -10°C (14°F) and a maximum of only 15°C (59°F), averaging just around 1°C (35°F). Precipitation in February is significantly lower at 53 mm (2.1 in) over 12 days, accompanied by a humidity of 79%. For a deeper look at the weather in February, you can visit Sendai weather in February.
September and March showcase contrasting weather patterns, reflecting the transition between seasons. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 33°C (92°F), with an average of 21°C (69°F), accompanied by high humidity at 86%. This month also sees significant rainfall, totaling 150 mm (5.9 in) over 14 days. In contrast, March experiences much cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 20°C (69°F), averaging at just 5°C (42°F). Precipitation is slightly less, amounting to 112 mm (4.4 in) over 13 days, and humidity is lower at 77%. For more detailed information on the weather in Sendai during March, you can check Sendai weather in March.
September and April present contrasting weather profiles, with September generally being much warmer and more humid. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 33°C (92°F), accompanied by high humidity levels at 86%. This month sees considerable rainfall, averaging 150 mm (5.9 in) over about 14 days. In contrast, April experiences cooler temperatures, with a minimum of -2°C (29°F) and a maximum of 26°C (80°F), leading to a much lower average temperature of 10°C (50°F). April also has less precipitation, totaling 109 mm (4.3 in) over 12 days, and lower humidity at 75%. For more detailed insights about April weather specifics, you can visit Sendai weather in April.
When comparing September and May weather, September tends to be warmer overall, with average temperatures around 21°C (69°F) and a maximum of 33°C (92°F), whereas May's temperatures range from a minimum of 4°C (40°F) to an average of 16°C (61°F) and a peak of 30°C (87°F). Additionally, September experiences higher humidity levels at 86%, compared to May's 80%. Precipitation is more frequent in September, with about 150 mm (5.9 in) over 14 days, compared to May's 107 mm (4.2 in) over 13 days. For a closer look at May weather, you can check Sendai weather in May.
In comparing the weather of September and June, we see that September tends to be warmer, with average temperatures reaching 21°C (69°F) compared to June's average of 19°C (67°F). The maximum temperatures in both months are similar, with September peaking at 33°C (92°F) while June reaches 32°C (89°F). However, September is notably wetter, receiving 150 mm (5.9 in) of precipitation over 14 days, compared to June's 101 mm (4.0 in) over 13 days. Humidity levels remain quite high in both months, with September at 86% and June slightly higher at 87%. For a detailed look at June weather patterns, you can check Sendai weather in June.
In comparing the weather of September and July, we see notable differences in temperature and precipitation patterns. September generally experiences a broader temperature range with a minimum of 8°C (47°F), an average of 21°C (69°F), and a maximum of 33°C (92°F). In contrast, July has a milder minimum temperature of 15°C (60°F) and a slightly higher average of 23°C (74°F), peaking at 35°C (95°F).
Precipitation is also more pronounced in July, with 232 mm (9.1 in) over 18 days, compared to September's 150 mm (5.9 in) over 14 days, indicating a wetter month. Humidity levels remain high in both months, with July at 92% and September slightly lower at 86%. For those interested in specific details, you can check out the month further through this link: Sendai weather in July.
In comparison to August, September experiences a notable drop in minimum temperatures, with lows averaging around 8°C (47°F) compared to August's 14°C (58°F). While September's average temperature is 21°C (69°F) and peaks at 33°C (92°F), August boasts a higher average of 25°C (77°F) and a maximum of 35°C (95°F). Additionally, September sees increased rainfall, totaling 150 mm (5.9 in) over 14 days, in contrast to August's 214 mm (8.4 in) over 20 days, indicating that while September is slightly wetter, August is more typically rainy. Humidity levels are also marginally lower in September at 86%, compared to August's 92%. For more detailed information, you can visit Sendai weather in August.
September and October present a notable shift in weather patterns. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 33°C (92°F), with an average of 21°C (69°F), creating warm and humid conditions paired with significant rainfall totaling 150 mm (5.9 in) over 14 days and a high humidity level of 86%. In contrast, October brings cooler temperatures, with a minimum of 4°C (39°F) and a maximum of 27°C (81°F), averaging at 15°C (59°F). Precipitation increases slightly to 208 mm (8.2 in), spread over 12 days, while humidity drops to a more comfortable 82%. The transition marks a gradual shift from the warmth of late summer to the crispness of autumn. For more details on the weather during this time, check Sendai weather in October.
In September, the weather is significantly warmer, with average temperatures reaching up to 21°C (69°F) and maximum highs of 33°C (92°F). The month also experiences high humidity levels at 86% and substantial rainfall, totaling 150 mm (5.9 in) over 14 days. In contrast, November ushers in cooler conditions, with average temperatures dropping to 9°C (48°F) and nighttime lows dipping to -3°C (27°F). Precipitation is much lighter in November, with only 40 mm (1.6 in) over 9 days, and humidity levels decreasing slightly to 79%. For more detailed information, you can check Sendai weather in November.
In September, the weather tends to be much warmer, with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 33°C (92°F), and an average of 21°C (69°F). This month also experiences higher precipitation, averaging 150 mm (5.9 in) over 14 days, making it feel quite humid at 86%. In contrast, December brings a significant drop in temperatures, with a minimum of -5°C (23°F) and a maximum of 16°C (61°F), averaging just 3°C (37°F). The amount of precipitation decreases to 67 mm (2.6 in) across 16 days, and humidity is slightly lower at 80%. For a closer look at the weather specifics in December, you can check Sendai weather in December.
September in Sendai marks a significant transition as the lingering warmth of summer begins to fade, giving way to a more temperate climate. With maximum temperatures reaching into the low 30s°C, the month still retains a hint of summer's heat, but average conditions start to cool down to a comfortable 21°C. This month is also characterized by higher humidity levels and frequent rainfall, with precipitation occurring on nearly half the days. Unlike the drier summer months, the lushness of the landscape is revived, offering a unique blend of warm days and refreshing showers. For a deeper dive into seasonal fluctuations and what to expect throughout the year, explore Sendai Climate.