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September Weather in Yaotsu, Japan

Last updated: August 23, 2025

In September, the average temperature in Yaotsu, Japan hovers around 22°C (72°F). During this time, you might experience a minimum temperature of 10°C (50°F) and a maximum soaring to 34°C (94°F). Be prepared for some rain, with an average precipitation of 241 mm (9.5 in) spread across 17 days. The air can feel quite humid, with an average humidity level of 87%.

September Temperature in Yaotsu

In September in Yaotsu, the average temperature is 22°C (72°F). The maximum can reach 34°C (94°F) while the minimum can drop to as low as 10°C (50°F). Travelers should prepare for warm days and cooler evenings during this time.

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

The chart illustrates September temperature patterns in Yaotsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yaotsu, September typically has an average temperature of 22°C (72°F), with highs reaching up to 34°C (94°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec373846546369767972625041
Data source: Temperature data for Yaotsu 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 Yaotsu

In Yaotsu in September, the precipitation amount is 241 mm (9.5 in) spread over 17 days, resulting in a steady supply of moisture throughout the month.

September Precipitation Trends in Yaotsu

The chart displays monthly precipitation patterns in Yaotsu, 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 Yaotsu, September typically receives around 241 mm (9.5 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec72921652072182204832702412197783
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Yaotsu

In Yaotsu in September humidity is 87%. With an average temperature of 22°C (72°F), this humidity feels like a warm blanket wrapping around you, making every step while traveling feel slightly heavier and more tedious, yet still refreshing in the shade.

September Average Humidity in Yaotsu

This chart illustrates the average monthly humidity levels in Yaotsu, 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 Yaotsu is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%74%76%83%87%93%91%87%85%83%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Yaotsu

In Yaotsu in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Yaotsu.

Maximum UV Index Levels in Yaotsu for September

The chart shows the monthly maximum UV Index (UVI) for Yaotsu 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 Yaotsu typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110754
Data source: Yaotsu 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 Yaotsu Compares to Other Months

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

This table compares monthly weather conditions in Yaotsu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)72 mm (2.9 inches)82%moderate
February Weather3°C (38°F)92 mm (3.6 inches)79%high
March Weather8°C (46°F)165 mm (6.5 inches)74%very high
April Weather12°C (54°F)207 mm (8.1 inches)76%very high
May Weather17°C (63°F)218 mm (8.6 inches)83%extreme
June Weather21°C (70°F)220 mm (8.7 inches)87%extreme
July Weather25°C (77°F)483 mm (19.0 inches)93%extreme
August Weather26°C (80°F)270 mm (10.6 inches)91%extreme
September Weather22°C (72°F)241 mm (9.5 inches)87%very high
October Weather17°C (62°F)219 mm (8.6 inches)85%high
November Weather10°C (51°F)77 mm (3.0 inches)83%moderate
December Weather5°C (41°F)83 mm (3.3 inches)83%moderate

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