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September Weather in Tsunagi, Japan

Last updated: August 23, 2025

In September, the average temperature in Tsunagi, Japan hovers around 25°C (77°F). Expect a pleasant range between a minimum of 14°C (57°F) and a maximum of 34°C (94°F). During this time, you can anticipate a total precipitation of 228 mm (9.0 in) spread over approximately 16 days, with an average humidity level of 84%.

September Temperature in Tsunagi

In September in Tsunagi, the average temperature is 25°C (77°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 14°C (57°F). This pleasant climate makes Tsunagi an ideal destination for outdoor activities and exploration during this time of year.

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

The chart illustrates September temperature patterns in Tsunagi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tsunagi, September typically has an average temperature of 25°C (77°F), with highs reaching up to 34°C (94°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec444654616873808277685647
Data source: Temperature data for Tsunagi 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 Tsunagi

In Tsunagi in September, the total precipitation amount is 228 mm (9.0 in) over the course of 16 days.

September Precipitation Trends in Tsunagi

The chart displays monthly precipitation patterns in Tsunagi, 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 Tsunagi, September typically receives around 228 mm (9.0 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec611051491432343434652422281319690
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Tsunagi

In Tsunagi in September, humidity is 84%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities challenging and prompting travelers to seek shade and stay hydrated.

September Average Humidity in Tsunagi

This chart illustrates the average monthly humidity levels in Tsunagi, 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 Tsunagi is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%71%71%78%84%86%92%91%84%83%81%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Tsunagi

In Tsunagi in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Tsunagi.

Maximum UV Index Levels in Tsunagi for September

The chart shows the monthly maximum UV Index (UVI) for Tsunagi 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 Tsunagi typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec569111212121311864
Data source: Tsunagi 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 Tsunagi Compares to Other Months

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

This table compares monthly weather conditions in Tsunagi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)61 mm (2.4 inches)75%moderate
February Weather8°C (46°F)105 mm (4.1 inches)71%high
March Weather12°C (54°F)149 mm (5.9 inches)71%very high
April Weather16°C (61°F)143 mm (5.6 inches)78%extreme
May Weather20°C (68°F)234 mm (9.2 inches)84%extreme
June Weather23°C (74°F)342 mm (13.5 inches)86%extreme
July Weather27°C (80°F)465 mm (18.3 inches)92%extreme
August Weather28°C (82°F)242 mm (9.5 inches)91%extreme
September Weather25°C (77°F)228 mm (9.0 inches)84%extreme
October Weather20°C (68°F)131 mm (5.2 inches)83%very high
November Weather14°C (57°F)96 mm (3.8 inches)81%high
December Weather8°C (47°F)90 mm (3.5 inches)79%moderate

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