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September Weather in Oma, Japan

Last updated: August 23, 2025

In September, the average temperature in Oma, Japan hovers around 20°C (69°F), with a cool minimum of 15°C (59°F) and a warm maximum reaching 27°C (80°F). Be prepared for some rain, as 116 mm (4.6 in) of precipitation can fall over approximately 12 days. Don't forget to dress accordingly for the high average humidity of 89% that permeates the air!

September Temperature in Oma

In September in Oma, the average temperature is 20°C (69°F). Maximum temperatures can reach 27°C (80°F), while minimums can dip as low as 15°C (59°F). This makes it an ideal time for travelers to explore the outdoors while enjoying pleasant weather.

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

The chart illustrates September temperature patterns in Oma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oma, September typically has an average temperature of 20°C (69°F), with highs reaching up to 27°C (80°F) and lows dropping to around 15°C (59°F).
JanFebMarAprMayJunJulAugSepOctNovDec343340455258667169604938
Data source: Temperature data for Oma 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 Oma

In Oma in September, the precipitation amount is 116 mm (4.6 in) over a span of 12 days.

September Precipitation Trends in Oma

The chart displays monthly precipitation patterns in Oma, 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 Oma, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec117115949795107100171116159133167
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oma

In Oma in September humidity is 89%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making outdoor activities uncomfortable and requiring frequent breaks for hydration and rest.

September Average Humidity in Oma

This chart illustrates the average monthly humidity levels in Oma, 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 Oma is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%77%78%86%91%95%97%89%82%78%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oma

In Oma in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Oma.

Maximum UV Index Levels in Oma for September

The chart shows the monthly maximum UV Index (UVI) for Oma 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 Oma typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235891010118632
Data source: Oma 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 Oma Compares to Other Months

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

This table compares monthly weather conditions in Oma, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)117 mm (4.6 inches)79%low
February Weather1°C (34°F)115 mm (4.5 inches)78%moderate
March Weather4°C (40°F)94 mm (3.7 inches)77%moderate
April Weather7°C (46°F)97 mm (3.8 inches)78%very high
May Weather11°C (52°F)95 mm (3.8 inches)86%very high
June Weather14°C (58°F)107 mm (4.2 inches)91%very high
July Weather19°C (66°F)100 mm (3.9 inches)95%very high
August Weather21°C (71°F)171 mm (6.7 inches)97%extreme
September Weather20°C (69°F)116 mm (4.6 inches)89%very high
October Weather16°C (61°F)159 mm (6.3 inches)81%high
November Weather9°C (49°F)133 mm (5.2 inches)78%moderate
December Weather3°C (38°F)167 mm (6.6 inches)77%low

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