April Weather in Sai, Japan

Last updated: August 23, 2025

In Sai, Japan, the average temperature in April hovers around 8°C (46°F), with a range that dips to a chilly 2°C (35°F) and peaks at a moderate 14°C (57°F). Expect 98 mm (3.9 in) of precipitation spread across 13 days, contributing to an average humidity of 78%. Perfect for cozy days indoors and adventurous strolls in the rain!

April Temperature in Sai

In April in Sai, the average temperature is 8°C (46°F), with maximums reaching 14°C (57°F) and minimums dropping as low as 2°C (35°F). This is a great time to pack a warm jacket and enjoy the cool, crisp air while exploring the area's attractions.

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

The chart illustrates April temperature patterns in Sai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sai, April typically has an average temperature of 8°C (46°F), with highs reaching up to 14°C (57°F) and lows dropping to around 2°C (35°F).

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

April Precipitation in Sai

In Sai in April, the precipitation amount is 98 mm (3.9 in) over a span of 13 days.

April Precipitation Trends in Sai

The chart displays monthly precipitation patterns in Sai, 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 Sai, April typically receives around 98 mm (3.9 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 Sai

In Sai in April, humidity is 78%. With an average temperature of 8°C (46°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities a bit uncomfortable and prompting you to dress in layers to stay warm while exploring.

April Average Humidity in Sai

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

In Sai in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Sai.

Maximum UV Index Levels in Sai for April

The chart shows the monthly maximum UV Index (UVI) for Sai 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 Sai typically reaches 8, which falls under the very high exposure category.

Data source: Sai 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 Sai Compares to Other Months

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

This table compares monthly weather conditions in Sai, 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 (34°F)	112 mm (4.4 inches)	79%	low
February Weather	1°C (34°F)	117 mm (4.6 inches)	78%	moderate
March Weather	4°C (40°F)	93 mm (3.7 inches)	77%	moderate
April Weather	8°C (46°F)	98 mm (3.9 inches)	78%	very high
May Weather	11°C (53°F)	103 mm (4.1 inches)	86%	very high
June Weather	15°C (59°F)	112 mm (4.4 inches)	91%	very high
July Weather	19°C (67°F)	110 mm (4.3 inches)	95%	very high
August Weather	22°C (72°F)	187 mm (7.4 inches)	97%	extreme
September Weather	21°C (69°F)	132 mm (5.2 inches)	89%	very high
October Weather	16°C (61°F)	156 mm (6.1 inches)	81%	high
November Weather	9°C (49°F)	131 mm (5.1 inches)	78%	moderate
December Weather	3°C (38°F)	167 mm (6.6 inches)	77%	low