September Weather in Ojiya, Japan

Last updated: August 23, 2025

In September, the average temperature in Ojiya, Japan is a pleasant 22°C (71°F). However, be prepared for temperature fluctuations, as it can drop to a chilly 9°C (48°F) or rise as high as a sweltering 36°C (98°F). Expect a fair amount of rain, with 179 mm (7.0 in) of precipitation spread over 18 days, and keep in mind that the average humidity hovers around a sticky 89%.

September Temperature in Ojiya

In September in Ojiya, the average temperature is 22°C (71°F). Maximums can reach 36°C (98°F) and minimums can drop as low as 9°C (48°F). This makes it a great time to explore, as you can enjoy warm days and cool evenings.

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

The chart illustrates September temperature patterns in Ojiya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ojiya, September typically has an average temperature of 22°C (71°F), with highs reaching up to 36°C (98°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Ojiya

In Ojiya in September, the precipitation amount is 179 mm (7.0 in) over a span of 18 days.

September Precipitation Trends in Ojiya

The chart displays monthly precipitation patterns in Ojiya, 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 Ojiya, September typically receives around 179 mm (7.0 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 Ojiya

In Ojiya in September humidity is 89%. With an average temperature of 22°C (71°F), this humidity feels like a warm blanket wrapped around you, making travel a bit more challenging as perspiration clings to your skin and the air feels thick, slowing your pace and requiring frequent breaks to stay refreshed.

September Average Humidity in Ojiya

This chart illustrates the average monthly humidity levels in Ojiya, 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 Ojiya 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 Ojiya

In Ojiya 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 Ojiya.

Maximum UV Index Levels in Ojiya for September

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

Data source: Ojiya 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 Ojiya Compares to Other Months

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

This table compares monthly weather conditions in Ojiya, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	200 mm (7.9 inches)	88%	moderate
February Weather	1°C (35°F)	182 mm (7.2 inches)	86%	moderate
March Weather	6°C (43°F)	159 mm (6.2 inches)	81%	very high
April Weather	11°C (52°F)	146 mm (5.8 inches)	78%	very high
May Weather	17°C (63°F)	147 mm (5.8 inches)	81%	very high
June Weather	21°C (69°F)	156 mm (6.1 inches)	88%	extreme
July Weather	25°C (77°F)	360 mm (14.2 inches)	92%	extreme
August Weather	26°C (80°F)	178 mm (7.0 inches)	92%	extreme
September Weather	22°C (71°F)	179 mm (7.0 inches)	89%	very high
October Weather	16°C (61°F)	205 mm (8.1 inches)	87%	high
November Weather	9°C (49°F)	150 mm (5.9 inches)	85%	moderate
December Weather	3°C (38°F)	229 mm (9.0 inches)	86%	moderate