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September Weather in Bibai, Japan

Last updated: August 23, 2025

In September, the average temperature in Bibai, Japan hovers around 18°C (64°F), with a minimum of 4°C (40°F) and a maximum reaching up to 30°C (86°F). Expect a total precipitation of approximately 85 mm (3.3 in) spread across 13 days, resulting in an average humidity of a rather high 88%. Be prepared for a mix of mild warmth and refreshing showers!

September Temperature in Bibai

In September in Bibai, the average temperature is 18°C (64°F). Maximums can reach 30°C (86°F) and minimums can be as low as 4°C (40°F). This makes Bibai a great destination for travelers seeking comfortable weather while exploring the area.

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

The chart illustrates September temperature patterns in Bibai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bibai, September typically has an average temperature of 18°C (64°F), with highs reaching up to 30°C (86°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec212433445561697064524027
Data source: Temperature data for Bibai 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 Bibai

In Bibai in September, the precipitation amount is 85 mm (3.3 in) spread over 13 days.

September Precipitation Trends in Bibai

The chart displays monthly precipitation patterns in Bibai, 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 Bibai, September typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec486175728991841648512011584
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bibai

In Bibai in September, humidity is 88%. With an average temperature of 18°C (64°F), this humidity feels like you’re walking through a warm, enveloping mist, making every step slightly weighted but also refreshing, ideal for leisurely exploration but challenging for strenuous activities.

September Average Humidity in Bibai

This chart illustrates the average monthly humidity levels in Bibai, 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 Bibai is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%83%81%81%86%87%93%95%88%83%79%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bibai

In Bibai 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 Bibai.

Maximum UV Index Levels in Bibai for September

The chart shows the monthly maximum UV Index (UVI) for Bibai 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 Bibai typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2367899108532
Data source: Bibai 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 Bibai Compares to Other Months

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

This table compares monthly weather conditions in Bibai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)48 mm (1.9 inches)84%low
February Weather-5°C (24°F)61 mm (2.4 inches)83%moderate
March Weather1°C (34°F)75 mm (2.9 inches)81%high
April Weather7°C (44°F)72 mm (2.8 inches)81%high
May Weather13°C (55°F)89 mm (3.5 inches)86%very high
June Weather16°C (61°F)91 mm (3.6 inches)87%very high
July Weather20°C (69°F)84 mm (3.3 inches)93%very high
August Weather21°C (70°F)164 mm (6.5 inches)95%very high
September Weather18°C (64°F)85 mm (3.3 inches)88%very high
October Weather11°C (53°F)120 mm (4.7 inches)83%moderate
November Weather5°C (41°F)115 mm (4.5 inches)79%moderate
December Weather-3°C (27°F)84 mm (3.3 inches)80%low

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