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September Weather in Mutsu, Japan

Last updated: August 23, 2025

In Mutsu, Japan, the average temperature in September hovers around 20°C (69°F), providing a pleasant climate for residents and visitors alike. Expect temperatures to range from a minimum of 15°C (60°F) to a maximum of 27°C (80°F). With 113 mm (4.5 in) of precipitation spread over 11 days, it's wise to carry an umbrella. The air is also quite humid, with an average humidity of 89%, making it feel warmer than it is. Enjoy the unique vibe that this weather brings!

September Temperature in Mutsu

In September in Mutsu, the average temperature is 20°C (69°F). Maximums can reach 27°C (80°F), while minimums can dip as low as 15°C (60°F). This pleasant climate makes it an ideal time for outdoor adventures and exploring all that Mutsu has to offer.

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

The chart illustrates September temperature patterns in Mutsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mutsu, 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 (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec343339455359667168604938
Data source: Temperature data for Mutsu 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 Mutsu

In Mutsu in September, the total precipitation amount is 113 mm (4.5 in), spread over a period of 11 days.

September Precipitation Trends in Mutsu

The chart displays monthly precipitation patterns in Mutsu, 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 Mutsu, September typically receives around 113 mm (4.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec130129939597114109193113170118203
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mutsu

In Mutsu 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 Mutsu

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

In Mutsu 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 Mutsu.

Maximum UV Index Levels in Mutsu for September

The chart shows the monthly maximum UV Index (UVI) for Mutsu 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 Mutsu typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec345891010118642
Data source: Mutsu 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 Mutsu Compares to Other Months

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

This table compares monthly weather conditions in Mutsu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)130 mm (5.1 inches)79%moderate
February Weather1°C (33°F)129 mm (5.1 inches)78%moderate
March Weather4°C (39°F)93 mm (3.7 inches)77%moderate
April Weather7°C (45°F)95 mm (3.7 inches)78%very high
May Weather11°C (53°F)97 mm (3.8 inches)86%very high
June Weather15°C (59°F)114 mm (4.5 inches)91%very high
July Weather19°C (67°F)109 mm (4.3 inches)95%very high
August Weather22°C (71°F)193 mm (7.6 inches)97%extreme
September Weather20°C (69°F)113 mm (4.5 inches)89%very high
October Weather16°C (60°F)170 mm (6.7 inches)81%high
November Weather10°C (49°F)118 mm (4.7 inches)78%moderate
December Weather4°C (39°F)202 mm (8.0 inches)77%low

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