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September Weather in Osaki, Japan

Last updated: August 23, 2025

In September, the average temperature in Osaki, Japan is a pleasant 21°C (71°F), with a range that can dip to a cool 9°C (49°F) and rise to a warm 33°C (92°F). Expect 138 mm (5.4 in) of precipitation spread over 13 days, contributing to an average humidity of 86%. Embrace the varied climate as you explore this charming destination!

September Temperature in Osaki

In September in Osaki, the average temperature is 21°C (71°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 9°C (49°F). This range makes it an ideal time for travelers to enjoy outdoor activities while also being prepared for cooler evenings.

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 21°C (71°F), with highs reaching up to 33°C (92°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec353743516167757770604939
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 138 mm (5.4 in) over the course of 13 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 138 mm (5.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec55471091111051062142161381984162
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 86%. With an average temperature of 21°C (71°F), this humidity feels like a warm, dense blanket wrapping around you, making outdoor activities feel slightly stifling and requiring frequent breaks for hydration.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%77%75%80%87%92%92%86%82%79%80%
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 is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478101011119643
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 Weather2°C (35°F)55 mm (2.1 inches)80%moderate
February Weather3°C (37°F)47 mm (1.9 inches)79%moderate
March Weather6°C (43°F)109 mm (4.3 inches)77%high
April Weather10°C (51°F)111 mm (4.4 inches)75%very high
May Weather16°C (62°F)105 mm (4.1 inches)80%very high
June Weather20°C (68°F)105 mm (4.2 inches)87%very high
July Weather24°C (75°F)214 mm (8.4 inches)92%extreme
August Weather25°C (78°F)216 mm (8.5 inches)92%extreme
September Weather21°C (71°F)138 mm (5.4 inches)86%very high
October Weather16°C (61°F)198 mm (7.8 inches)82%high
November Weather10°C (50°F)41 mm (1.6 inches)79%moderate
December Weather4°C (39°F)62 mm (2.4 inches)80%moderate

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