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September Weather in Tosa, Japan

Last updated: August 23, 2025

In September, the average temperature in Tosa, Japan hovers around 25°C (76°F). Expect a pleasant range with a minimum of 15°C (60°F) and a maximum of 31°C (89°F). Be prepared for some rain, as the area receives 348 mm (13.7 in) of precipitation over about 20 days. The air is notably humid, with an average humidity of 85%.

September Temperature in Tosa

In September in Tosa, the average temperature is 25°C (76°F). The maximum can reach 31°C (89°F), while the minimum can be as low as 15°C (60°F). This makes it an ideal time to explore the outdoors and enjoy various activities in a comfortable climate.

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

The chart illustrates September temperature patterns in Tosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tosa, September typically has an average temperature of 25°C (76°F), with highs reaching up to 31°C (89°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec454653596672798176685849
Data source: Temperature data for Tosa 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 Tosa

In Tosa in September, the precipitation amount is 348 mm (13.7 in) over the course of 20 days.

September Precipitation Trends in Tosa

The chart displays monthly precipitation patterns in Tosa, 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 Tosa, September typically receives around 348 mm (13.7 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec691001792032313155793373483378180
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Tosa

In Tosa in September humidity is 85%. With an average temperature of 25°C (76°F), this humidity feels like a warm blanket wrapping around you, making traveling a bit of a challenge as you navigate the sticky air and sweat clings to your skin.

September Average Humidity in Tosa

This chart illustrates the average monthly humidity levels in Tosa, 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 Tosa is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%70%70%76%83%86%91%88%85%82%79%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Tosa

In Tosa 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 Tosa.

Maximum UV Index Levels in Tosa for September

The chart shows the monthly maximum UV Index (UVI) for Tosa 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 Tosa typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111112121210764
Data source: Tosa 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 Tosa Compares to Other Months

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

This table compares monthly weather conditions in Tosa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)69 mm (2.7 inches)74%moderate
February Weather8°C (46°F)100 mm (3.9 inches)70%high
March Weather12°C (53°F)179 mm (7.1 inches)70%very high
April Weather15°C (59°F)203 mm (8.0 inches)76%extreme
May Weather19°C (67°F)231 mm (9.1 inches)82%extreme
June Weather22°C (72°F)314 mm (12.4 inches)86%extreme
July Weather26°C (79°F)579 mm (22.8 inches)91%extreme
August Weather27°C (81°F)337 mm (13.3 inches)88%extreme
September Weather25°C (76°F)348 mm (13.7 inches)85%very high
October Weather20°C (68°F)337 mm (13.3 inches)82%high
November Weather14°C (58°F)81 mm (3.2 inches)79%high
December Weather9°C (49°F)80 mm (3.1 inches)77%moderate

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