June Weather in Koshu, Japan

Last updated: August 23, 2025

In June, the average temperature in Koshu, Japan hovers around 17°C (63°F), with a comfortable range of 7°C (44°F) to 28°C (82°F). Be prepared for some rainfall, as 179 mm (7.1 in) of precipitation may fall over 19 days. With an average humidity level of 88%, it’s a perfect time to embrace the cozy, damp atmosphere!

June Temperature in Koshu

In June in Koshu, the average temperature is 17°C (63°F). Maximums can reach 28°C (82°F), while minimums can dip to as low as 7°C (44°F). This mild climate makes Koshu an ideal destination for exploring outdoor activities and enjoying pleasant weather during your travels.

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

The chart illustrates June 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, June typically has an average temperature of 17°C (63°F), with highs reaching up to 28°C (82°F) and lows dropping to around 7°C (44°F).

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

June Precipitation in Koshu

In Koshu in June, the precipitation amount is 179 mm (7.1 in) occurring over 19 days.

June Precipitation Trends in Koshu

The chart displays monthly precipitation patterns in Koshu, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Koshu, June typically receives around 179 mm (7.1 inches) of precipitation spread over approximately 19 days.

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

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Millimeters (mm) Inches (in)

June Humidity in Koshu

In Koshu in June, humidity is 88%. With an average temperature of 17°C (63°F), this humidity feels like a thick blanket enveloping you, making outdoor activities feel stifling and sticky, potentially dampening the joy of exploration and requiring frequent breaks for hydration.

June Average Humidity in Koshu

This chart illustrates the average monthly humidity levels in Koshu, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Koshu is approximately 88%, offering insight into how humid the weather typically is during this month.

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

June UV Index in Koshu

In Koshu in June, 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 June

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

Data source: Koshu June 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 June 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 June’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 June’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