August Weather in Joetsu, Japan

Last updated: August 23, 2025

In Joetsu, Japan, the average temperature in August hovers around 27°C (82°F). Expect a range from a cozy 17°C (63°F) to a sizzling 38°C (100°F). With 157 mm (6.2 in) of precipitation spread over 16 days, you might want to carry an umbrella. Additionally, the average humidity is high at 92%, ensuring that the air feels quite tropical!

August Temperature in Joetsu

In August in Joetsu, the average temperature is 27°C (82°F), with maximums reaching 38°C (100°F) and minimums dropping as low as 17°C (63°F). It's a great time to enjoy outdoor activities and explore the local scenery, but be sure to stay hydrated and seek shade during the hottest parts of the day.

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

The chart illustrates August temperature patterns in Joetsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joetsu, August typically has an average temperature of 27°C (82°F), with highs reaching up to 38°C (100°F) and lows dropping to around 17°C (63°F).

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

August Precipitation in Joetsu

In Joetsu in August, the total precipitation amount is 157 mm (6.2 in) spread over 16 days.

August Precipitation Trends in Joetsu

The chart displays monthly precipitation patterns in Joetsu, 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 Joetsu, August typically receives around 157 mm (6.2 inches) of precipitation spread over approximately 16 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 Joetsu

In Joetsu in August humidity is 92%. With an average temperature of 27°C (82°F), this humidity feels like a thick, heavy blanket enveloping you, making traveling quite uncomfortable as sweat clings to your skin and every step feels laborious.

August Average Humidity in Joetsu

This chart illustrates the average monthly humidity levels in Joetsu, 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 Joetsu is approximately 92%, 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 Joetsu

In Joetsu 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 Joetsu.

Maximum UV Index Levels in Joetsu for August

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

Data source: Joetsu 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 Joetsu Compares to Other Months

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

This table compares monthly weather conditions in Joetsu, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	233 mm (9.2 inches)	88%	moderate
February Weather	4°C (39°F)	181 mm (7.1 inches)	86%	moderate
March Weather	8°C (46°F)	128 mm (5.0 inches)	81%	very high
April Weather	12°C (53°F)	121 mm (4.7 inches)	78%	very high
May Weather	17°C (64°F)	105 mm (4.1 inches)	81%	very high
June Weather	21°C (70°F)	105 mm (4.1 inches)	88%	extreme
July Weather	26°C (79°F)	290 mm (11.4 inches)	92%	extreme
August Weather	27°C (82°F)	157 mm (6.2 inches)	92%	extreme
September Weather	23°C (74°F)	171 mm (6.7 inches)	89%	very high
October Weather	18°C (64°F)	190 mm (7.5 inches)	87%	high
November Weather	12°C (53°F)	170 mm (6.7 inches)	85%	moderate
December Weather	6°C (43°F)	273 mm (10.7 inches)	86%	moderate