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September Weather in Osaki, Japan

Last updated: August 23, 2025

In Osaki, Japan, the average temperature in September hovers around 25°C (78°F). Temperatures can range from a minimum of 16°C (61°F) to a maximum of 33°C (91°F). Expect 289 mm (11.4 in) of precipitation over 20 days, accompanied by an average humidity level of 80%. Prepare for a warm and moist month!

September Temperature in Osaki

In September in Osaki, the average temperature is 25°C (78°F). The maximum can reach 33°C (91°F), while the minimum can be as low as 16°C (61°F). This makes Osaki a perfect destination for travelers seeking warm weather and pleasant outdoor activities during this time of year.

September Weather in Osaki: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Osaki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Osaki, September typically has an average temperature of 25°C (78°F), with highs reaching up to 33°C (91°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec464855616873808277705949
Data source: Temperature data for Osaki generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Osaki

In Osaki in September, the precipitation amount is 289 mm (11.4 in) distributed over 20 days.

September Precipitation Trends in Osaki

The chart displays monthly precipitation patterns in Osaki, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Osaki, September typically receives around 289 mm (11.4 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec551061781422514083782292891709679
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Osaki

In Osaki in September, humidity is 80%. With an average temperature of 25°C (78°F), this humidity feels like a warm blanket enveloping you, making every outdoor activity feel more strenuous and steaming, while also causing you to seek out shade and refreshment more frequently.

September Average Humidity in Osaki

This chart illustrates the average monthly humidity levels in Osaki, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Osaki is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%68%72%79%83%86%90%85%80%78%76%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Osaki

In Osaki in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Osaki.

Maximum UV Index Levels in Osaki for September

The chart shows the monthly maximum UV Index (UVI) for Osaki in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Osaki typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5610101212121311865
Data source: Osaki September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Osaki Compares to Other Months

Weather in Osaki varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Osaki, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Osaki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)55 mm (2.2 inches)72%moderate
February Weather9°C (48°F)105 mm (4.2 inches)68%high
March Weather13°C (55°F)178 mm (7.0 inches)72%very high
April Weather16°C (62°F)142 mm (5.6 inches)79%very high
May Weather20°C (69°F)251 mm (9.9 inches)83%extreme
June Weather23°C (74°F)408 mm (16.0 inches)86%extreme
July Weather27°C (80°F)378 mm (14.9 inches)90%extreme
August Weather28°C (82°F)229 mm (9.0 inches)85%extreme
September Weather25°C (78°F)289 mm (11.4 inches)80%extreme
October Weather21°C (70°F)170 mm (6.7 inches)78%very high
November Weather15°C (59°F)95 mm (3.8 inches)76%high
December Weather10°C (50°F)79 mm (3.1 inches)74%moderate

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