September Weather in Oi, Japan

Last updated: August 23, 2025

In Oi, Japan during September, the average temperature hovers around 23°C (74°F), with a minimum dipping to 13°C (55°F) and a scorching maximum reaching 36°C (97°F). Expect 201 mm (7.9 in) of precipitation over 19 days, contributing to a high average humidity of 86%.

September Temperature in Oi

In September in Oi, the average temperature is 23°C (74°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 13°C (55°F). This makes it an ideal time for travelers to enjoy outdoor activities while being prepared for varying weather conditions.

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

The chart illustrates September temperature patterns in Oi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oi, September typically has an average temperature of 23°C (74°F), with highs reaching up to 36°C (97°F) and lows dropping to around 13°C (55°F).

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

September Precipitation in Oi

In Oi in September, the total precipitation amount reaches 201 mm (7.9 in) over the course of 19 days.

September Precipitation Trends in Oi

The chart displays monthly precipitation patterns in Oi, 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 Oi, September typically receives around 201 mm (7.9 inches) of precipitation spread over approximately 19 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 Oi

In Oi in September, humidity is 86%. With an average temperature of 23°C (74°F), this humidity feels like you're stepping into a warm embrace, making travel a bit sticky yet invigorating, as the air wraps around you, inviting you to explore while reminding you to stay hydrated.

September Average Humidity in Oi

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

In Oi 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 Oi.

Maximum UV Index Levels in Oi for September

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

Data source: Oi 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 Oi Compares to Other Months

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

This table compares monthly weather conditions in Oi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	47 mm (1.8 inches)	76%	moderate
February Weather	6°C (42°F)	50 mm (2.0 inches)	74%	moderate
March Weather	10°C (50°F)	144 mm (5.7 inches)	70%	very high
April Weather	14°C (57°F)	126 mm (5.0 inches)	74%	very high
May Weather	19°C (67°F)	117 mm (4.6 inches)	81%	extreme
June Weather	22°C (72°F)	168 mm (6.6 inches)	88%	extreme
July Weather	26°C (79°F)	252 mm (9.9 inches)	93%	extreme
August Weather	28°C (82°F)	133 mm (5.3 inches)	90%	extreme
September Weather	23°C (74°F)	201 mm (7.9 inches)	86%	very high
October Weather	18°C (64°F)	291 mm (11.4 inches)	83%	high
November Weather	12°C (55°F)	69 mm (2.7 inches)	80%	moderate
December Weather	7°C (44°F)	55 mm (2.2 inches)	78%	moderate