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September Weather in Kamiiso, Japan

Last updated: August 23, 2025

In September, the average temperature in Kamiiso, Japan hovers around 20°C (68°F), with a comfortable minimum of 14°C (57°F) and a pleasant maximum of 28°C (83°F). Expect some rain, as the area typically receives 166 mm (6.5 in) of precipitation over approximately 12 days. With an average humidity of 89%, the air tends to feel quite moist, adding a welcoming touch to your visit.

September Temperature in Kamiiso

In September in Kamiiso, the average temperature is 20°C (68°F). Maximum temperatures can reach 28°C (83°F), while the minimum can drop as low as 14°C (57°F). It's a great time to visit for those who enjoy mild weather and pleasant days.

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

The chart illustrates September temperature patterns in Kamiiso, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kamiiso, September typically has an average temperature of 20°C (68°F), with highs reaching up to 28°C (83°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec303038445258667067584635
Data source: Temperature data for Kamiiso 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 Kamiiso

In Kamiiso in September, the precipitation amount is 166 mm (6.5 in) distributed over a span of 12 days.

September Precipitation Trends in Kamiiso

The chart displays monthly precipitation patterns in Kamiiso, 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 Kamiiso, September typically receives around 166 mm (6.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec61798610111612815225416614910389
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kamiiso

In Kamiiso in September, humidity is 89%. With an average temperature of 20°C (68°F), this humidity feels like walking through a warm, damp blanket that clings to your skin, making each step feel heavier and the air thick with moisture, which can be quite uncomfortable for traveling.

September Average Humidity in Kamiiso

This chart illustrates the average monthly humidity levels in Kamiiso, 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 Kamiiso is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%77%78%86%91%95%97%89%82%78%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kamiiso

In Kamiiso in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Kamiiso.

Maximum UV Index Levels in Kamiiso for September

The chart shows the monthly maximum UV Index (UVI) for Kamiiso 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 Kamiiso typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235891010118632
Data source: Kamiiso 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 Kamiiso Compares to Other Months

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

This table compares monthly weather conditions in Kamiiso, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)61 mm (2.4 inches)79%low
February Weather-1°C (30°F)79 mm (3.1 inches)78%moderate
March Weather3°C (38°F)86 mm (3.4 inches)77%moderate
April Weather7°C (45°F)101 mm (4.0 inches)78%very high
May Weather11°C (52°F)116 mm (4.6 inches)86%very high
June Weather15°C (59°F)128 mm (5.0 inches)91%very high
July Weather19°C (67°F)152 mm (6.0 inches)95%very high
August Weather21°C (71°F)254 mm (10.0 inches)97%extreme
September Weather20°C (68°F)166 mm (6.5 inches)89%very high
October Weather15°C (58°F)149 mm (5.9 inches)81%high
November Weather8°C (47°F)103 mm (4.1 inches)78%moderate
December Weather2°C (35°F)89 mm (3.5 inches)77%low

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