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September Weather in Ijuin, Japan

Last updated: August 23, 2025

In Ijuin, Japan, the average temperature in September reaches a warm 26°C (79°F), with temperatures ranging from a cool 17°C (64°F) to a sizzling 34°C (93°F). Expect plenty of moisture, as precipitation averages 254 mm (10.0 in) over 18 days. Moreover, the atmosphere is typically humid, with an average humidity of 80%.

September Temperature in Ijuin

In September in Ijuin, the average temperature is 26°C (79°F). The maximum can reach up to 34°C (93°F), while the minimum can drop as low as 17°C (64°F). This pleasant climate makes Ijuin an ideal destination for travelers seeking warm and enjoyable weather.

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

The chart illustrates September temperature patterns in Ijuin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ijuin, September typically has an average temperature of 26°C (79°F), with highs reaching up to 34°C (93°F) and lows dropping to around 17°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec484956636975818379716051
Data source: Temperature data for Ijuin 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 Ijuin

In Ijuin in September, the total precipitation amount reaches 254 mm (10.0 in) over the course of 18 days.

September Precipitation Trends in Ijuin

The chart displays monthly precipitation patterns in Ijuin, 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 Ijuin, September typically receives around 254 mm (10.0 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec531031701472604234031922541379782
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ijuin

In Ijuin in September humidity is 80%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket, making outdoor activities feel sticky and exhausting, potentially dampening the travel experience and necessitating frequent breaks to cool down and hydrate.

September Average Humidity in Ijuin

This chart illustrates the average monthly humidity levels in Ijuin, 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 Ijuin 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 Ijuin

In Ijuin 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 Ijuin.

Maximum UV Index Levels in Ijuin for September

The chart shows the monthly maximum UV Index (UVI) for Ijuin 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 Ijuin typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5610111212121311864
Data source: Ijuin 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 Ijuin Compares to Other Months

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

This table compares monthly weather conditions in Ijuin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)53 mm (2.1 inches)72%moderate
February Weather10°C (50°F)103 mm (4.0 inches)68%high
March Weather13°C (56°F)170 mm (6.7 inches)72%very high
April Weather17°C (63°F)147 mm (5.8 inches)79%extreme
May Weather21°C (70°F)260 mm (10.2 inches)83%extreme
June Weather24°C (75°F)423 mm (16.7 inches)86%extreme
July Weather27°C (81°F)403 mm (15.9 inches)90%extreme
August Weather28°C (84°F)192 mm (7.6 inches)85%extreme
September Weather26°C (79°F)254 mm (10.0 inches)80%extreme
October Weather22°C (71°F)137 mm (5.4 inches)78%very high
November Weather16°C (61°F)97 mm (3.8 inches)76%high
December Weather11°C (51°F)82 mm (3.2 inches)74%moderate

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