September Weather in Shiraoi, Japan

Last updated: August 23, 2025

In Shiraoi, Japan, the average temperature in September is a mild 18°C (64°F). However, be prepared for temperature fluctuations, as it can drop to a minimum of 8°C (47°F) and peak at a balmy 26°C (80°F). With an average monthly precipitation of 142 mm (5.6 in) spread over 15 days, and an average humidity of 88%, it's wise to pack your umbrella along with your sunscreen!

September Temperature in Shiraoi

In September in Shiraoi, the average temperature is 18°C (64°F). The maximum can reach 26°C (80°F) and the minimum can be as low as 8°C (47°F). This makes it an ideal time for travelers to enjoy a pleasant mix of mild warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Shiraoi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shiraoi, September typically has an average temperature of 18°C (64°F), with highs reaching up to 26°C (80°F) and lows dropping to around 8°C (47°F).

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

September Precipitation in Shiraoi

In Shiraoi in September, the total precipitation amount is 142 mm (5.6 in) spread over a period of 15 days.

September Precipitation Trends in Shiraoi

The chart displays monthly precipitation patterns in Shiraoi, 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 Shiraoi, September typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 15 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Shiraoi

In Shiraoi in September, humidity is 88%. With an average temperature of 18°C (64°F), this humidity feels like you’re walking through a warm, enveloping mist, making every step slightly weighted but also refreshing, ideal for leisurely exploration but challenging for strenuous activities.

September Average Humidity in Shiraoi

This chart illustrates the average monthly humidity levels in Shiraoi, 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 Shiraoi is approximately 88%, 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 Shiraoi

In Shiraoi in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Shiraoi.

Maximum UV Index Levels in Shiraoi for September

The chart shows the monthly maximum UV Index (UVI) for Shiraoi 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 Shiraoi typically reaches 8, which falls under the very high exposure category.

Data source: Shiraoi 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 Shiraoi Compares to Other Months

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

This table compares monthly weather conditions in Shiraoi, 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 (26°F)	58 mm (2.3 inches)	84%	low
February Weather	-3°C (26°F)	53 mm (2.1 inches)	83%	moderate
March Weather	1°C (34°F)	88 mm (3.5 inches)	81%	moderate
April Weather	5°C (42°F)	96 mm (3.8 inches)	81%	high
May Weather	10°C (51°F)	92 mm (3.6 inches)	86%	very high
June Weather	14°C (58°F)	131 mm (5.2 inches)	87%	very high
July Weather	18°C (66°F)	113 mm (4.4 inches)	93%	very high
August Weather	20°C (68°F)	194 mm (7.6 inches)	95%	very high
September Weather	18°C (64°F)	142 mm (5.6 inches)	88%	very high
October Weather	12°C (54°F)	140 mm (5.5 inches)	83%	high
November Weather	6°C (43°F)	107 mm (4.2 inches)	79%	moderate
December Weather	-1°C (30°F)	64 mm (2.5 inches)	80%	low