April Weather in Shiojiri, Japan

Last updated: August 23, 2025

In April, the average temperature in Shiojiri, Japan hovers around 9°C (48°F), providing a cool and refreshing climate. Temperatures can range from a chilly -6°C (21°F) to a warm 26°C (78°F), ensuring a diverse weather experience. Expect about 143 mm (5.6 in) of precipitation over 13 days, contributing to the region's lush atmosphere, with an average humidity of 74% that adds to the overall charm of the season.

April Temperature in Shiojiri

In April in Shiojiri, the average temperature is 9°C (48°F), with maximums reaching 26°C (78°F) and minimums dropping as low as -6°C (21°F). This variation in temperature suggests an adventurous spirit is needed for travelers, as you'll experience both mild and chilly weather during your visit.

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

The chart illustrates April temperature patterns in Shiojiri, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shiojiri, April typically has an average temperature of 9°C (48°F), with highs reaching up to 26°C (78°F) and lows dropping to around -6°C (21°F).

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

April Precipitation in Shiojiri

In Shiojiri in April, the precipitation amount is 143 mm (5.6 in) over a span of 13 days.

April Precipitation Trends in Shiojiri

The chart displays monthly precipitation patterns in Shiojiri, 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 Shiojiri, April typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 13 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Shiojiri

In Shiojiri in April humidity is 74%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and necessitating warm layers to fully enjoy your explorations.

April Average Humidity in Shiojiri

This chart illustrates the average monthly humidity levels in Shiojiri, 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 Shiojiri is approximately 74%, 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 Shiojiri

In Shiojiri in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Shiojiri.

Maximum UV Index Levels in Shiojiri for April

The chart shows the monthly maximum UV Index (UVI) for Shiojiri 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 Shiojiri typically reaches 10, which falls under the very high exposure category.

Data source: Shiojiri 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 Shiojiri Compares to Other Months

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

This table compares monthly weather conditions in Shiojiri, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	75 mm (3.0 inches)	76%	moderate
February Weather	-1°C (30°F)	80 mm (3.2 inches)	74%	high
March Weather	4°C (40°F)	141 mm (5.6 inches)	70%	very high
April Weather	9°C (48°F)	143 mm (5.6 inches)	74%	very high
May Weather	15°C (58°F)	155 mm (6.1 inches)	81%	extreme
June Weather	18°C (65°F)	149 mm (5.8 inches)	88%	extreme
July Weather	22°C (72°F)	289 mm (11.4 inches)	93%	extreme
August Weather	23°C (74°F)	151 mm (5.9 inches)	90%	extreme
September Weather	19°C (66°F)	171 mm (6.7 inches)	86%	very high
October Weather	13°C (56°F)	237 mm (9.3 inches)	83%	high
November Weather	7°C (44°F)	66 mm (2.6 inches)	80%	moderate
December Weather	1°C (34°F)	84 mm (3.3 inches)	78%	moderate