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September Weather in Shonai, Japan

Last updated: August 23, 2025

In September, the average temperature in Shonai, Japan is a pleasant 20°C (69°F), with the mercury dipping as low as 9°C (48°F) and soaring up to a sizzling 34°C (93°F). Expect roughly 169 mm (6.6 in) of precipitation spread over 17 days, contributing to an average humidity of 84%. So, whether you're exploring the outdoors or seeking shelter from the rain, be prepared for a mix of warm and wet days!

September Temperature in Shonai

In September in Shonai, the average temperature is 20°C (69°F), with maximums reaching 34°C (93°F) and minimums dipping as low as 9°C (48°F). This makes it a great time to visit, as you can enjoy warm days while still experiencing cooler evenings.

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

The chart illustrates September temperature patterns in Shonai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shonai, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec333340486066747769584837
Data source: Temperature data for Shonai 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 Shonai

In Shonai in September, the precipitation amount is 169 mm (6.6 in) occurring over the course of 17 days.

September Precipitation Trends in Shonai

The chart displays monthly precipitation patterns in Shonai, 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 Shonai, September typically receives around 169 mm (6.6 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec181171147144138147268269169190170241
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Shonai

In Shonai in September humidity is 84%. With an average temperature of 20°C (69°F), this humidity feels like walking through a warm, moist blanket, making travel feel heavy and slightly fatigued as the heat clings to your skin and leaves you yearning for a refreshing breeze.

September Average Humidity in Shonai

This chart illustrates the average monthly humidity levels in Shonai, 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 Shonai is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%76%78%86%90%93%92%84%80%76%78%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Shonai

In Shonai 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 Shonai.

Maximum UV Index Levels in Shonai for September

The chart shows the monthly maximum UV Index (UVI) for Shonai 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 Shonai typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346991011119643
Data source: Shonai 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 Shonai Compares to Other Months

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

This table compares monthly weather conditions in Shonai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)181 mm (7.1 inches)79%moderate
February Weather1°C (34°F)171 mm (6.7 inches)78%moderate
March Weather4°C (40°F)147 mm (5.8 inches)76%high
April Weather9°C (49°F)144 mm (5.7 inches)78%very high
May Weather15°C (60°F)137 mm (5.4 inches)86%very high
June Weather19°C (67°F)147 mm (5.8 inches)90%very high
July Weather24°C (75°F)268 mm (10.5 inches)93%extreme
August Weather25°C (77°F)269 mm (10.6 inches)92%extreme
September Weather20°C (69°F)169 mm (6.6 inches)84%very high
October Weather15°C (59°F)190 mm (7.5 inches)80%high
November Weather9°C (48°F)169 mm (6.7 inches)76%moderate
December Weather3°C (37°F)241 mm (9.5 inches)78%moderate

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