April Weather in Iwanai, Japan

Last updated: August 23, 2025

In April, the average temperature in Iwanai, Japan hovers around 5°C (41°F). This month can bring a chilly minimum of -4°C (25°F) and a pleasant maximum of 17°C (63°F). Expect 88 mm (3.4 in) of precipitation spread over about 12 days, while the air remains fairly humid with an average of 81%.

April Temperature in Iwanai

In April in Iwanai, the average temperature is 5°C (41°F), with maximums reaching 17°C (63°F) and minimums dipping as low as -4°C (25°F). It's advisable to pack layers and be prepared for varying weather conditions while exploring.

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

The chart illustrates April temperature patterns in Iwanai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwanai, April typically has an average temperature of 5°C (41°F), with highs reaching up to 17°C (63°F) and lows dropping to around -4°C (25°F).

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

April Precipitation in Iwanai

In Iwanai, in April, the precipitation amount is 88 mm (3.4 in) over the course of 12 days.

April Precipitation Trends in Iwanai

The chart displays monthly precipitation patterns in Iwanai, 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 Iwanai, April typically receives around 88 mm (3.4 inches) of precipitation spread over approximately 12 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 Iwanai

In Iwanai in April, humidity is 81%. With an average temperature of 5°C (41°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor exploration uncomfortable and requiring warm, waterproof clothing to stay comfortable while traveling.

April Average Humidity in Iwanai

This chart illustrates the average monthly humidity levels in Iwanai, 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 Iwanai is approximately 81%, 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 Iwanai

In Iwanai in April, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Iwanai.

Maximum UV Index Levels in Iwanai for April

The chart shows the monthly maximum UV Index (UVI) for Iwanai 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 Iwanai typically reaches 7, which falls under the high exposure category.

Data source: Iwanai 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 Iwanai Compares to Other Months

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

This table compares monthly weather conditions in Iwanai, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	99 mm (3.9 inches)	84%	low
February Weather	-3°C (26°F)	103 mm (4.1 inches)	83%	moderate
March Weather	1°C (34°F)	98 mm (3.8 inches)	81%	moderate
April Weather	5°C (41°F)	88 mm (3.4 inches)	81%	high
May Weather	11°C (53°F)	86 mm (3.4 inches)	86%	very high
June Weather	15°C (59°F)	109 mm (4.3 inches)	87%	very high
July Weather	20°C (68°F)	94 mm (3.7 inches)	93%	very high
August Weather	21°C (70°F)	145 mm (5.7 inches)	95%	very high
September Weather	18°C (64°F)	126 mm (5.0 inches)	88%	very high
October Weather	12°C (53°F)	149 mm (5.9 inches)	83%	moderate
November Weather	5°C (41°F)	176 mm (6.9 inches)	79%	moderate
December Weather	-2°C (29°F)	159 mm (6.3 inches)	80%	low