April Weather in Joetsu, Japan

Last updated: August 23, 2025

In April, the average temperature in Joetsu, Japan is a mild 12°C (53°F), with highs reaching up to 24°C (76°F) and lows dropping to around 2°C (35°F). Expect about 121 mm (4.7 in) of rainfall spread across 14 days, contributing to an average humidity of 78%. Be prepared for a mix of comfortable days and occasional showers!

April Temperature in Joetsu

In April in Joetsu, the average temperature is 12°C (53°F). The maximum can reach 24°C (76°F), while the minimum can drop as low as 2°C (35°F). This weather makes it a great time for travelers to enjoy outdoor activities while still needing to pack for cooler evenings.

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

The chart illustrates April 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, April typically has an average temperature of 12°C (53°F), with highs reaching up to 24°C (76°F) and lows dropping to around 2°C (35°F).

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

April Precipitation in Joetsu

In Joetsu in April, the precipitation amount is 121 mm (4.7 in) spread over 14 days.

April Precipitation Trends in Joetsu

The chart displays monthly precipitation patterns in Joetsu, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Joetsu, April typically receives around 121 mm (4.7 inches) of precipitation spread over approximately 14 days.

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

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Millimeters (mm) Inches (in)

April Humidity in Joetsu

In Joetsu in April, humidity is 78%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that lingers in the air, making it essential to wear layers while exploring the sights, as the cool moisture can seep into your bones and leave you feeling a bit uncomfortable if not properly dressed for the weather.

April Average Humidity in Joetsu

This chart illustrates the average monthly humidity levels in Joetsu, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Joetsu is approximately 78%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Joetsu

In Joetsu in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Joetsu.

Maximum UV Index Levels in Joetsu for April

The chart shows the monthly maximum UV Index (UVI) for Joetsu in April, 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 April, the maximum UV index in Joetsu typically reaches 9, which falls under the very high exposure category.

Data source: Joetsu April 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 April 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 April’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 April’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