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September Weather in Koori, Japan

Last updated: August 23, 2025

In September, the average temperature in Koori, Japan hovers around 20°C (68°F), making it a delightful time to explore. Be prepared for a range, with minimums dipping to 8°C (46°F) and maximums soaring up to 33°C (92°F). During this month, you can expect around 154 mm (6.1 in) of precipitation spread over about 14 days, paired with an average humidity of 84%.

September Temperature in Koori

In September in Koori, the average temperature is 20°C (68°F). Maximums can reach 33°C (92°F) and minimums can be as low as 8°C (46°F). This diverse climate makes Koori an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Koori, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koori, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec313341496066737668574736
Data source: Temperature data for Koori 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 Koori

In Koori in September, the total precipitation amount is 154 mm (6.1 in) over a period of 14 days.

September Precipitation Trends in Koori

The chart displays monthly precipitation patterns in Koori, 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 Koori, September typically receives around 154 mm (6.1 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec62521121061131092481691542073868
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Koori

In Koori in September humidity is 84%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket, making travel a challenge as the air clings to your skin, and every step feels heavier in the mugginess.

September Average Humidity in Koori

This chart illustrates the average monthly humidity levels in Koori, 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 Koori is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Koori

In Koori in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Koori.

Maximum UV Index Levels in Koori for September

The chart shows the monthly maximum UV Index (UVI) for Koori 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 Koori typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111119653
Data source: Koori 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 Koori Compares to Other Months

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

This table compares monthly weather conditions in Koori, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)62 mm (2.4 inches)76%moderate
February Weather1°C (33°F)52 mm (2.0 inches)75%moderate
March Weather5°C (41°F)112 mm (4.4 inches)72%high
April Weather10°C (50°F)106 mm (4.2 inches)73%very high
May Weather16°C (60°F)113 mm (4.5 inches)80%very high
June Weather19°C (66°F)109 mm (4.3 inches)87%extreme
July Weather23°C (74°F)248 mm (9.7 inches)92%extreme
August Weather24°C (76°F)169 mm (6.7 inches)90%extreme
September Weather20°C (68°F)154 mm (6.1 inches)84%very high
October Weather14°C (58°F)207 mm (8.2 inches)80%high
November Weather8°C (47°F)38 mm (1.5 inches)77%moderate
December Weather2°C (36°F)68 mm (2.7 inches)77%moderate

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