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September Weather in Nambu, Japan

Last updated: August 23, 2025

In September, the average temperature in Nambu, Japan is a pleasant 21°C (69°F). Visitors can expect a minimum as low as 11°C (52°F) and a maximum soaring to 32°C (90°F). However, prepare for a bit of rain, as precipitation amounts can reach 301 mm (11.8 in) over 22 days, accompanied by an average humidity of 86%.

September Temperature in Nambu

In September in Nambu, the average temperature is 21°C (69°F). Maximums can reach 32°C (90°F) and minimums can be as low as 11°C (52°F). This makes Nambu an ideal destination for travelers seeking pleasant weather and a comfortable climate.

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

The chart illustrates September temperature patterns in Nambu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nambu, September typically has an average temperature of 21°C (69°F), with highs reaching up to 32°C (90°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec363845526066737669605041
Data source: Temperature data for Nambu 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 Nambu

In Nambu in September, the precipitation amount is 301 mm (11.8 in) spread over 22 days.

September Precipitation Trends in Nambu

The chart displays monthly precipitation patterns in Nambu, 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 Nambu, September typically receives around 301 mm (11.8 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec7610024725423929855032430138110994
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nambu

In Nambu in September humidity is 86%. With an average temperature of 21°C (69°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and more deliberate while traveling. The air clings to your skin, creating a sticky sensation that might slow you down, but the vibrant sights and sounds around you encourage exploration despite the sultry atmosphere.

September Average Humidity in Nambu

This chart illustrates the average monthly humidity levels in Nambu, 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 Nambu is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%74%70%74%82%88%93%90%86%83%80%78%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nambu

In Nambu in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Nambu.

Maximum UV Index Levels in Nambu for September

The chart shows the monthly maximum UV Index (UVI) for Nambu 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 Nambu typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110754
Data source: Nambu 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 Nambu Compares to Other Months

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

This table compares monthly weather conditions in Nambu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)76 mm (3.0 inches)76%moderate
February Weather3°C (38°F)100 mm (3.9 inches)74%high
March Weather7°C (45°F)246 mm (9.7 inches)70%very high
April Weather11°C (52°F)254 mm (10.0 inches)74%very high
May Weather16°C (61°F)239 mm (9.4 inches)81%extreme
June Weather19°C (66°F)298 mm (11.7 inches)88%extreme
July Weather23°C (73°F)550 mm (21.6 inches)93%extreme
August Weather24°C (76°F)324 mm (12.8 inches)90%extreme
September Weather21°C (69°F)301 mm (11.8 inches)86%very high
October Weather15°C (60°F)381 mm (15.0 inches)83%high
November Weather10°C (50°F)109 mm (4.3 inches)80%moderate
December Weather5°C (41°F)94 mm (3.7 inches)78%moderate

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