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September Weather in Omitama, Japan

Last updated: August 23, 2025

In September, the average temperature in Omitama, Japan is a pleasant 23°C (74°F), with minimums dipping to 15°C (60°F) and soaring to highs of 32°C (90°F). This month typically experiences about 176 mm (6.9 in) of precipitation spread over 17 days, contributing to an average humidity level of 84%.

September Temperature in Omitama

In September in Omitama, the average temperature is 23°C (74°F). Maximum temperatures can reach 32°C (90°F), while the minimum can drop to as low as 15°C (60°F). This moderate climate makes Omitama an ideal destination for travelers seeking pleasant weather and outdoor activities.

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

The chart illustrates September temperature patterns in Omitama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Omitama, September typically has an average temperature of 23°C (74°F), with highs reaching up to 32°C (90°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec424450566470767974665747
Data source: Temperature data for Omitama 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 Omitama

In Omitama in September, the precipitation amount is 176 mm (6.9 in) spread over 17 days.

September Precipitation Trends in Omitama

The chart displays monthly precipitation patterns in Omitama, 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 Omitama, September typically receives around 176 mm (6.9 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec535015012914415520910917625810273
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Omitama

In Omitama in September, humidity is 84%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel sticky and heavy, while the air's thickness can be quite exhausting for long periods of travel.

September Average Humidity in Omitama

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

In Omitama 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 Omitama.

Maximum UV Index Levels in Omitama for September

The chart shows the monthly maximum UV Index (UVI) for Omitama 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 Omitama typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109653
Data source: Omitama 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 Omitama Compares to Other Months

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

This table compares monthly weather conditions in Omitama, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)53 mm (2.1 inches)76%moderate
February Weather6°C (44°F)50 mm (2.0 inches)75%moderate
March Weather10°C (50°F)150 mm (5.9 inches)72%high
April Weather13°C (56°F)129 mm (5.1 inches)73%very high
May Weather18°C (65°F)143 mm (5.6 inches)80%very high
June Weather21°C (70°F)155 mm (6.1 inches)87%extreme
July Weather24°C (76°F)209 mm (8.2 inches)92%extreme
August Weather26°C (80°F)109 mm (4.3 inches)90%very high
September Weather23°C (74°F)176 mm (6.9 inches)84%very high
October Weather19°C (66°F)258 mm (10.2 inches)80%high
November Weather14°C (57°F)102 mm (4.0 inches)77%moderate
December Weather8°C (47°F)73 mm (2.9 inches)77%moderate

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