September Weather in Biratori, Japan

Last updated: August 23, 2025

In September, the average temperature in Biratori, Japan is a comfortable 18°C (65°F), with a minimum dipping to 7°C (46°F) and a maximum soaring to 27°C (82°F). Expect 120 mm (4.7 in) of precipitation over 12 days, accompanied by a high average humidity of 88%—perfect for enjoying the lush, vibrant scenery!

September Temperature in Biratori

In September in Biratori, the average temperature is 18°C (65°F). Maximum can reach 27°C (82°F) and minimum can be as low as 7°C (46°F). This pleasant temperature range makes Biratori an ideal destination for travelers seeking mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in Biratori, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Biratori, September typically has an average temperature of 18°C (65°F), with highs reaching up to 27°C (82°F) and lows dropping to around 7°C (46°F).

Data source: Temperature data for Biratori generated using information from the Copernicus Climate Change Service.

September Precipitation in Biratori

In Biratori in September, the precipitation amount is 120 mm (4.7 in) over a period of 12 days.

September Precipitation Trends in Biratori

The chart displays monthly precipitation patterns in Biratori, 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 Biratori, September typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Biratori

In Biratori in September, humidity is 88%. With an average temperature of 18°C (65°F), this humidity feels like a warm blanket wrapping around you, making travel feel slightly sticky and the air thick, which can be quite tiring when exploring the area.

September Average Humidity in Biratori

This chart illustrates the average monthly humidity levels in Biratori, 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 Biratori is approximately 88%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Biratori

In Biratori 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 Biratori.

Maximum UV Index Levels in Biratori for September

The chart shows the monthly maximum UV Index (UVI) for Biratori 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 Biratori typically reaches 8, which falls under the very high exposure category.

Data source: Biratori 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 Biratori Compares to Other Months

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

This table compares monthly weather conditions in Biratori, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	53 mm (2.1 inches)	84%	low
February Weather	-3°C (26°F)	65 mm (2.5 inches)	83%	moderate
March Weather	2°C (35°F)	91 mm (3.6 inches)	81%	moderate
April Weather	6°C (43°F)	94 mm (3.7 inches)	81%	very high
May Weather	11°C (52°F)	101 mm (4.0 inches)	86%	very high
June Weather	15°C (59°F)	116 mm (4.6 inches)	87%	very high
July Weather	19°C (67°F)	104 mm (4.1 inches)	93%	very high
August Weather	21°C (69°F)	152 mm (6.0 inches)	95%	very high
September Weather	18°C (65°F)	120 mm (4.7 inches)	88%	very high
October Weather	13°C (55°F)	181 mm (7.1 inches)	83%	high
November Weather	6°C (44°F)	116 mm (4.6 inches)	79%	moderate
December Weather	0°C (31°F)	83 mm (3.3 inches)	80%	low