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September Weather in Kokubu-matsuki, Japan

Last updated: August 23, 2025

In September, the average temperature in Kokubu-matsuki, Japan hovers around 25°C (77°F). Expect a range from a cool 14°C (57°F) to a warm 33°C (91°F). Rainfall can be quite frequent, with 248 mm (9.8 in) expected over 18 days, and humidity levels are typically high at 80%. Prepare for both sunshine and showers!

September Temperature in Kokubu-matsuki

In September in Kokubu-matsuki, the average temperature is 25°C (77°F). Maximums can reach 33°C (91°F) and minimums can be as low as 14°C (57°F). This pleasant weather makes Kokubu-matsuki an ideal destination for travelers looking to enjoy comfortable outdoor activities.

September Weather in Kokubu-matsuki: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Kokubu-matsuki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kokubu-matsuki, September typically has an average temperature of 25°C (77°F), with highs reaching up to 33°C (91°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec444653606773798177685747
Data source: Temperature data for Kokubu-matsuki 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 Kokubu-matsuki

In Kokubu-matsuki in September, the precipitation amount is 248 mm (9.8 in) over the course of 18 days.

September Precipitation Trends in Kokubu-matsuki

The chart displays monthly precipitation patterns in Kokubu-matsuki, 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 Kokubu-matsuki, September typically receives around 248 mm (9.8 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec541011691492523924062042481439179
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kokubu-matsuki

In Kokubu-matsuki in September humidity is 80%. With an average temperature of 25°C (77°F), this humidity feels like traveling through a warm, tropical rainforest where the air is thick and steamy, making even the simplest stroll feel like a workout.

September Average Humidity in Kokubu-matsuki

This chart illustrates the average monthly humidity levels in Kokubu-matsuki, 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 Kokubu-matsuki is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%68%72%79%83%86%90%85%80%78%76%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kokubu-matsuki

In Kokubu-matsuki 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 Kokubu-matsuki.

Maximum UV Index Levels in Kokubu-matsuki for September

The chart shows the monthly maximum UV Index (UVI) for Kokubu-matsuki 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 Kokubu-matsuki typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5610101212121311865
Data source: Kokubu-matsuki 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 Kokubu-matsuki Compares to Other Months

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

This table compares monthly weather conditions in Kokubu-matsuki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)54 mm (2.1 inches)72%moderate
February Weather8°C (46°F)101 mm (4.0 inches)68%high
March Weather12°C (54°F)169 mm (6.6 inches)72%very high
April Weather16°C (60°F)149 mm (5.9 inches)79%very high
May Weather20°C (68°F)252 mm (9.9 inches)83%extreme
June Weather23°C (73°F)392 mm (15.4 inches)86%extreme
July Weather26°C (80°F)406 mm (16.0 inches)90%extreme
August Weather27°C (82°F)204 mm (8.0 inches)85%extreme
September Weather25°C (77°F)248 mm (9.8 inches)80%extreme
October Weather20°C (68°F)143 mm (5.6 inches)78%very high
November Weather14°C (57°F)91 mm (3.6 inches)76%high
December Weather8°C (47°F)79 mm (3.1 inches)74%moderate

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