August Weather in Kosai, Japan

Last updated: August 23, 2025

In August, the average temperature in Kosai, Japan reaches a warm 29°C (85°F). However, it can swing between a comfortable 20°C (68°F) and a scorching 40°C (105°F). During this month, expect about 189 mm (7.4 in) of precipitation over approximately 15 days, contributing to an average humidity of 91%.

August Temperature in Kosai

In August in Kosai, the average temperature is 29°C (85°F). Maximums can reach 40°C (105°F), and minimums can be as low as 20°C (68°F). This warm and varied climate makes it an ideal time for travelers seeking both sunshine and comfortable evenings.

August Weather in Kosai: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Kosai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kosai, August typically has an average temperature of 29°C (85°F), with highs reaching up to 40°C (105°F) and lows dropping to around 20°C (68°F).

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

August Precipitation in Kosai

In Kosai in August, the precipitation amount is 189 mm (7.4 in) spread over 15 days.

August Precipitation Trends in Kosai

The chart displays monthly precipitation patterns in Kosai, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Kosai, August typically receives around 189 mm (7.4 inches) of precipitation spread over approximately 15 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Kosai

In Kosai in August humidity is 91%. With an average temperature of 29°C (85°F), this humidity feels like stepping into a warm, heavy blanket, making travel uncomfortable and leaving you drenched in sweat within moments of stepping outside.

August Average Humidity in Kosai

This chart illustrates the average monthly humidity levels in Kosai, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Kosai is approximately 91%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Kosai

In Kosai in August, 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 Kosai.

Maximum UV Index Levels in Kosai for August

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

Data source: Kosai August 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 August Weather in Kosai Compares to Other Months

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

This table compares monthly weather conditions in Kosai, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (44°F)	49 mm (1.9 inches)	82%	moderate
February Weather	7°C (45°F)	69 mm (2.7 inches)	79%	moderate
March Weather	12°C (53°F)	154 mm (6.1 inches)	74%	very high
April Weather	16°C (60°F)	160 mm (6.3 inches)	76%	very high
May Weather	20°C (69°F)	187 mm (7.4 inches)	83%	extreme
June Weather	23°C (74°F)	240 mm (9.4 inches)	87%	extreme
July Weather	27°C (81°F)	385 mm (15.2 inches)	93%	extreme
August Weather	29°C (85°F)	189 mm (7.4 inches)	91%	extreme
September Weather	25°C (78°F)	217 mm (8.5 inches)	87%	very high
October Weather	20°C (68°F)	284 mm (11.2 inches)	85%	high
November Weather	14°C (58°F)	75 mm (2.9 inches)	83%	moderate
December Weather	9°C (48°F)	65 mm (2.6 inches)	83%	moderate