April Weather in Isawa, Japan

Last updated: August 23, 2025

In April, the average temperature in Isawa, Japan hovers around 9°C (48°F), with temperatures ranging from a chilly -4°C (25°F) to a pleasantly warm 25°C (78°F). Expect some rain, as precipitation totals reach 138 mm (5.4 in) over approximately 15 days. The atmosphere is characterized by a relatively high average humidity of 74%, making it a unique time of year in this vibrant locale.

April Temperature in Isawa

In April in Isawa, the average temperature is 9°C (48°F). Maximums can reach 25°C (78°F), while minimums can drop to as low as -4°C (25°F). This variation makes it essential for travelers to pack layers to stay comfortable throughout the day.

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

The chart illustrates April temperature patterns in Isawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isawa, April typically has an average temperature of 9°C (48°F), with highs reaching up to 25°C (78°F) and lows dropping to around -4°C (25°F).

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

April Precipitation in Isawa

In Isawa in April, the total precipitation amount is 138 mm (5.4 in) recorded over the course of 15 days.

April Precipitation Trends in Isawa

The chart displays monthly precipitation patterns in Isawa, 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 Isawa, April typically receives around 138 mm (5.4 inches) of precipitation spread over approximately 15 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 Isawa

In Isawa 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 Isawa

This chart illustrates the average monthly humidity levels in Isawa, 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 Isawa 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 Isawa

In Isawa 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 Isawa.

Maximum UV Index Levels in Isawa for April

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

Data source: Isawa 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 Isawa Compares to Other Months

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

This table compares monthly weather conditions in Isawa, showing how April’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