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September Weather in Shibukawa, Japan

Last updated: August 23, 2025

In September, the average temperature in Shibukawa, Japan hovers around 21°C (70°F), creating a pleasant atmosphere for visitors. Expect temperatures to vary, with a minimum of 10°C (50°F) and a maximum reaching up to 33°C (91°F). Be prepared for occasional rain, as the area receives about 188 mm (7.4 in) of precipitation over 20 days. With an average humidity of 89%, the air can feel quite moist, making for a refreshingly tropical experience.

September Temperature in Shibukawa

In September in Shibukawa, the average temperature is 21°C (70°F), with maximums reaching 33°C (91°F) and minimums dipping as low as 10°C (50°F). This makes it an ideal time for travelers seeking pleasant weather and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Shibukawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shibukawa, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (91°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec353745526268747769605040
Data source: Temperature data for Shibukawa 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 Shibukawa

In Shibukawa in September, the precipitation amount is 188 mm (7.4 in) over a period of 20 days.

September Precipitation Trends in Shibukawa

The chart displays monthly precipitation patterns in Shibukawa, 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 Shibukawa, September typically receives around 188 mm (7.4 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec64611241361451602711731892654761
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Shibukawa

In Shibukawa in September, humidity is 89%. With an average temperature of 21°C (70°F), this humidity feels like a warm, heavy blanket wrapping around you, making travel feel sluggish and prompting you to seek occasional relief in shaded areas or air-conditioned spaces.

September Average Humidity in Shibukawa

This chart illustrates the average monthly humidity levels in Shibukawa, 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 Shibukawa is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%79%81%88%92%92%89%87%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Shibukawa

In Shibukawa 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 Shibukawa.

Maximum UV Index Levels in Shibukawa for September

The chart shows the monthly maximum UV Index (UVI) for Shibukawa 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 Shibukawa typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46891111111110753
Data source: Shibukawa 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 Shibukawa Compares to Other Months

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

This table compares monthly weather conditions in Shibukawa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)64 mm (2.5 inches)88%moderate
February Weather3°C (37°F)61 mm (2.4 inches)86%high
March Weather7°C (45°F)124 mm (4.9 inches)81%very high
April Weather11°C (53°F)136 mm (5.4 inches)78%very high
May Weather17°C (62°F)145 mm (5.7 inches)81%extreme
June Weather20°C (68°F)160 mm (6.3 inches)88%extreme
July Weather24°C (75°F)271 mm (10.7 inches)92%extreme
August Weather25°C (78°F)173 mm (6.8 inches)92%extreme
September Weather21°C (70°F)188 mm (7.4 inches)89%very high
October Weather15°C (60°F)265 mm (10.5 inches)87%high
November Weather10°C (50°F)47 mm (1.9 inches)85%moderate
December Weather5°C (40°F)61 mm (2.4 inches)86%moderate

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