September Weather in Okawa, Japan

Last updated: August 23, 2025

In Okawa, Japan, the average temperature in September is a pleasant 24°C (76°F). Expect temperatures to range from a minimum of 13°C (55°F) to a maximum of 34°C (94°F). During this month, precipitation averages 209 mm (8.2 in) over 15 days, contributing to a high average humidity of 84%.

September Temperature in Okawa

In September in Okawa, the average temperature is 24°C (76°F). Maximum temperatures can reach up to 34°C (94°F), while the minimum can drop as low as 13°C (55°F). This range of temperatures makes Okawa an ideal destination for travelers seeking warm and pleasant weather.

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

The chart illustrates September temperature patterns in Okawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Okawa, September typically has an average temperature of 24°C (76°F), with highs reaching up to 34°C (94°F) and lows dropping to around 13°C (55°F).

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

September Precipitation in Okawa

In Okawa in September, the total precipitation amount is 209 mm (8.2 in) over the course of 15 days.

September Precipitation Trends in Okawa

The chart displays monthly precipitation patterns in Okawa, 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 Okawa, September typically receives around 209 mm (8.2 inches) of precipitation spread over approximately 15 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 Okawa

In Okawa in September humidity is 84%. With an average temperature of 24°C (76°F), this humidity feels like a warm, damp embrace that can make outdoor activities feel sticky and uncomfortable, requiring frequent breaks in the shade and plenty of hydration for travelers.

September Average Humidity in Okawa

This chart illustrates the average monthly humidity levels in Okawa, 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 Okawa is approximately 84%, 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 Okawa

In Okawa in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Okawa.

Maximum UV Index Levels in Okawa for September

The chart shows the monthly maximum UV Index (UVI) for Okawa 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 Okawa typically reaches 11, which falls under the extreme exposure category.

Data source: Okawa 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 Okawa Compares to Other Months

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

This table compares monthly weather conditions in Okawa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	54 mm (2.1 inches)	75%	moderate
February Weather	7°C (44°F)	85 mm (3.4 inches)	71%	high
March Weather	11°C (52°F)	133 mm (5.2 inches)	71%	very high
April Weather	15°C (59°F)	124 mm (4.9 inches)	78%	extreme
May Weather	20°C (68°F)	200 mm (7.9 inches)	84%	extreme
June Weather	23°C (74°F)	233 mm (9.2 inches)	86%	extreme
July Weather	27°C (80°F)	450 mm (17.7 inches)	92%	extreme
August Weather	28°C (82°F)	331 mm (13.0 inches)	91%	extreme
September Weather	24°C (76°F)	209 mm (8.2 inches)	84%	extreme
October Weather	19°C (66°F)	120 mm (4.7 inches)	83%	high
November Weather	13°C (55°F)	57 mm (2.2 inches)	81%	high
December Weather	7°C (46°F)	71 mm (2.8 inches)	79%	moderate