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September Weather in Tonami, Japan

Last updated: August 23, 2025

In September, the average temperature in Tonami, Japan hovers around 21°C (70°F), with a minimum dipping to 7°C (45°F) and a peak reaching 33°C (92°F). Expect 285 mm (11.2 in) of precipitation spread over 20 days, and enjoy the high average humidity of 84% that adds to the region's vibrant atmosphere.

September Temperature in Tonami

In September in Tonami, the average temperature is 21°C (70°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 7°C (45°F). This makes it a great time for travelers to enjoy mild and pleasant weather while exploring the area.

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

The chart illustrates September temperature patterns in Tonami, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tonami, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec313341506167757869584737
Data source: Temperature data for Tonami 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 Tonami

In Tonami in September, the total precipitation amount is 285 mm (11.2 in), falling over the course of 20 days.

September Precipitation Trends in Tonami

The chart displays monthly precipitation patterns in Tonami, 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 Tonami, September typically receives around 285 mm (11.2 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec205193209214170248424321285261162250
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Tonami

In Tonami in September, humidity is 84%. With an average temperature of 21°C (70°F), this humidity feels like thick, warm air wrapping around you, making outdoor activities quite uncomfortable and necessitating frequent hydration breaks for a more enjoyable travel experience.

September Average Humidity in Tonami

This chart illustrates the average monthly humidity levels in Tonami, 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 Tonami is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%76%77%85%89%93%92%84%81%77%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Tonami

In Tonami 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 Tonami.

Maximum UV Index Levels in Tonami for September

The chart shows the monthly maximum UV Index (UVI) for Tonami 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 Tonami typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110753
Data source: Tonami 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 Tonami Compares to Other Months

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

This table compares monthly weather conditions in Tonami, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)204 mm (8.1 inches)80%moderate
February Weather0°C (33°F)193 mm (7.6 inches)78%high
March Weather5°C (41°F)209 mm (8.2 inches)76%very high
April Weather10°C (51°F)214 mm (8.4 inches)77%very high
May Weather16°C (62°F)170 mm (6.7 inches)85%extreme
June Weather20°C (67°F)248 mm (9.8 inches)89%extreme
July Weather24°C (76°F)424 mm (16.7 inches)93%extreme
August Weather25°C (78°F)321 mm (12.6 inches)92%extreme
September Weather21°C (70°F)285 mm (11.2 inches)84%very high
October Weather15°C (59°F)261 mm (10.3 inches)81%high
November Weather8°C (47°F)162 mm (6.4 inches)77%moderate
December Weather3°C (37°F)250 mm (9.8 inches)79%moderate

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