September Weather in Otsuki, Japan

Last updated: August 23, 2025

In September, the average temperature in Otsuki, Japan hovers around 20°C (69°F), with a pleasant range between 11°C (52°F) and 33°C (92°F). Expect an average of 238 mm (9.4 in) of precipitation over 21 days, contributing to a notable average humidity of 86%. Perfect for cozy indoor days or adventurous outdoor activities!

September Temperature in Otsuki

In September in Otsuki, the average temperature is 20°C (69°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 11°C (52°F). This mild climate makes it an ideal time for travelers seeking pleasant weather for outdoor activities.

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

The chart illustrates September temperature patterns in Otsuki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Otsuki, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Otsuki

In Otsuki in September, the precipitation amount is 238 mm (9.4 in) over a period of 21 days.

September Precipitation Trends in Otsuki

The chart displays monthly precipitation patterns in Otsuki, 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 Otsuki, September typically receives around 238 mm (9.4 inches) of precipitation spread over approximately 21 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 Otsuki

In Otsuki in September, humidity is 86%. With an average temperature of 20°C (69°F), this humidity feels like a warm, dense blanket wrapping around you, making travel feel sluggish and sticky, as each step can leave you yearning for a cool breeze or a refreshing drink.

September Average Humidity in Otsuki

This chart illustrates the average monthly humidity levels in Otsuki, 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 Otsuki is approximately 86%, 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 Otsuki

In Otsuki 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 Otsuki.

Maximum UV Index Levels in Otsuki for September

The chart shows the monthly maximum UV Index (UVI) for Otsuki 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 Otsuki typically reaches 10, which falls under the very high exposure category.

Data source: Otsuki 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 Otsuki Compares to Other Months

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

This table compares monthly weather conditions in Otsuki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	59 mm (2.3 inches)	76%	moderate
February Weather	3°C (38°F)	72 mm (2.9 inches)	74%	high
March Weather	7°C (45°F)	182 mm (7.2 inches)	70%	very high
April Weather	11°C (52°F)	164 mm (6.5 inches)	74%	very high
May Weather	16°C (61°F)	164 mm (6.5 inches)	81%	extreme
June Weather	19°C (66°F)	216 mm (8.5 inches)	88%	extreme
July Weather	23°C (74°F)	305 mm (12.0 inches)	93%	extreme
August Weather	25°C (77°F)	172 mm (6.8 inches)	90%	extreme
September Weather	20°C (69°F)	238 mm (9.4 inches)	86%	very high
October Weather	15°C (59°F)	364 mm (14.3 inches)	83%	high
November Weather	10°C (50°F)	84 mm (3.3 inches)	80%	moderate
December Weather	4°C (40°F)	68 mm (2.7 inches)	78%	moderate