September Weather in Otawara, Japan

Last updated: August 23, 2025

In September, the average temperature in Otawara, Japan hovers around 22°C (72°F). During this time, temperatures can dip to a minimum of 10°C (51°F) and soar to a maximum of 33°C (92°F). Visitors should be prepared for considerable rainfall, with an average precipitation of 176 mm (6.9 in) spread over 18 days, and expect high humidity levels averaging 89%.

September Temperature in Otawara

In September in Otawara, the average temperature is 22°C (72°F). Maximums can reach up to 33°C (92°F), while minimums can dip as low as 10°C (51°F). This pleasant weather makes it an ideal time for outdoor activities and exploring the local attractions.

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

The chart illustrates September temperature patterns in Otawara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Otawara, September typically has an average temperature of 22°C (72°F), with highs reaching up to 33°C (92°F) and lows dropping to around 10°C (51°F).

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

September Precipitation in Otawara

In Otawara in September, the total precipitation amount is 176 mm (6.9 in) spread over 18 days.

September Precipitation Trends in Otawara

The chart displays monthly precipitation patterns in Otawara, 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 Otawara, September typically receives around 176 mm (6.9 inches) of precipitation spread over approximately 18 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 Otawara

In Otawara in September humidity is 89%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making every step feel heavier and the air thick with moisture. It's a reminder to stay hydrated and take frequent breaks to enjoy the lush surroundings while navigating the often steamy atmosphere.

September Average Humidity in Otawara

This chart illustrates the average monthly humidity levels in Otawara, 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 Otawara is approximately 89%, 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 Otawara

In Otawara in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Otawara.

Maximum UV Index Levels in Otawara for September

The chart shows the monthly maximum UV Index (UVI) for Otawara 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 Otawara typically reaches 9, which falls under the very high exposure category.

Data source: Otawara 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 Otawara Compares to Other Months

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

This table compares monthly weather conditions in Otawara, 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 (38°F)	40 mm (1.6 inches)	88%	moderate
February Weather	4°C (40°F)	42 mm (1.6 inches)	86%	moderate
March Weather	8°C (47°F)	134 mm (5.3 inches)	81%	high
April Weather	12°C (55°F)	127 mm (5.0 inches)	78%	very high
May Weather	18°C (64°F)	142 mm (5.6 inches)	81%	very high
June Weather	21°C (70°F)	148 mm (5.8 inches)	88%	extreme
July Weather	25°C (76°F)	255 mm (10.0 inches)	92%	extreme
August Weather	26°C (80°F)	189 mm (7.5 inches)	92%	extreme
September Weather	22°C (72°F)	176 mm (6.9 inches)	89%	very high
October Weather	16°C (62°F)	225 mm (8.9 inches)	87%	high
November Weather	11°C (52°F)	56 mm (2.2 inches)	85%	moderate
December Weather	5°C (42°F)	53 mm (2.1 inches)	86%	moderate