August Weather in Koshu, Japan

Last updated: August 23, 2025

In August, the average temperature in Koshu, Japan hovers around 23°C (73°F). Expect a minimum of 12°C (55°F) and a maximum of 33°C (91°F). Be prepared for rain, as precipitation averages 190 mm (7.5 in) spread over 23 days, contributing to a high humidity level of 90%.

August Temperature in Koshu

In August in Koshu, the average temperature is 23°C (73°F). Maximum temperatures can reach 33°C (91°F) and minimums can drop as low as 12°C (55°F). This pleasantly warm climate makes Koshu an ideal destination for travelers seeking comfortable weather.

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

The chart illustrates August temperature patterns in Koshu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koshu, August typically has an average temperature of 23°C (73°F), with highs reaching up to 33°C (91°F) and lows dropping to around 12°C (55°F).

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

August Precipitation in Koshu

In Koshu in August, the total precipitation amount is 190 mm (7.5 in), spread over a duration of 23 days.

August Precipitation Trends in Koshu

The chart displays monthly precipitation patterns in Koshu, 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 Koshu, August typically receives around 190 mm (7.5 inches) of precipitation spread over approximately 23 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in Koshu

In Koshu in August, humidity is 90%. With an average temperature of 23°C (73°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities sweaty and uncomfortable, and creating a need for frequent hydration breaks while exploring.

August Average Humidity in Koshu

This chart illustrates the average monthly humidity levels in Koshu, 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 Koshu is approximately 90%, 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 Koshu

In Koshu 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 Koshu.

Maximum UV Index Levels in Koshu for August

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

Data source: Koshu 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 Koshu Compares to Other Months

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

This table compares monthly weather conditions in Koshu, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	48 mm (1.9 inches)	76%	moderate
February Weather	0°C (33°F)	58 mm (2.3 inches)	74%	high
March Weather	5°C (41°F)	144 mm (5.7 inches)	70%	very high
April Weather	9°C (48°F)	138 mm (5.4 inches)	74%	very high
May Weather	14°C (58°F)	148 mm (5.8 inches)	81%	extreme
June Weather	17°C (63°F)	179 mm (7.1 inches)	88%	extreme
July Weather	21°C (70°F)	320 mm (12.6 inches)	93%	extreme
August Weather	23°C (73°F)	190 mm (7.5 inches)	90%	extreme
September Weather	18°C (65°F)	208 mm (8.2 inches)	86%	very high
October Weather	13°C (55°F)	324 mm (12.8 inches)	83%	high
November Weather	7°C (45°F)	56 mm (2.2 inches)	80%	moderate
December Weather	2°C (36°F)	52 mm (2.1 inches)	78%	moderate