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April Weather in Koshimizu, Japan

Last updated: August 23, 2025

In April, the average temperature in Koshimizu, Japan hovers around 4°C (39°F). Expect a chilly range, with minimums dropping to -10°C (15°F) and maximums peaking at 23°C (73°F). Additionally, you'll encounter around 72 mm (2.8 in) of precipitation spread over 12 days, contributing to an average humidity of 83%.

April Temperature in Koshimizu

In April in Koshimizu, the average temperature is 4°C (39°F). The maximum can reach 23°C (73°F), and the minimum can be as low as -10°C (15°F). Be prepared for a wide range of temperatures to make the most of your travel experience.

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

The chart illustrates April temperature patterns in Koshimizu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koshimizu, April typically has an average temperature of 4°C (39°F), with highs reaching up to 23°C (73°F) and lows dropping to around -10°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec191828395056646561513926
Data source: Temperature data for Koshimizu generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in Koshimizu

In Koshimizu in April, the total precipitation amount is 72 mm (2.8 in) over the course of 12 days.

April Precipitation Trends in Koshimizu

The chart displays monthly precipitation patterns in Koshimizu, 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 Koshimizu, April typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec54558872959679129951599670
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Koshimizu

In Koshimizu in April, humidity is 83%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that penetrates your clothing, making outdoor activities feel brisk and uncomfortable for traveling.

April Average Humidity in Koshimizu

This chart illustrates the average monthly humidity levels in Koshimizu, 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 Koshimizu is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%83%86%88%93%96%89%83%80%79%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Koshimizu

In Koshimizu 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 Koshimizu.

Maximum UV Index Levels in Koshimizu for April

The chart shows the monthly maximum UV Index (UVI) for Koshimizu 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 Koshimizu typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2367891098532
Data source: Koshimizu 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 Koshimizu Compares to Other Months

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

This table compares monthly weather conditions in Koshimizu, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)54 mm (2.1 inches)84%low
February Weather-8°C (19°F)55 mm (2.2 inches)83%moderate
March Weather-2°C (29°F)88 mm (3.5 inches)83%high
April Weather4°C (39°F)72 mm (2.8 inches)83%high
May Weather10°C (50°F)95 mm (3.7 inches)86%very high
June Weather13°C (56°F)96 mm (3.8 inches)88%very high
July Weather18°C (64°F)79 mm (3.1 inches)93%very high
August Weather18°C (65°F)129 mm (5.1 inches)96%very high
September Weather16°C (61°F)95 mm (3.7 inches)89%very high
October Weather11°C (51°F)159 mm (6.2 inches)83%moderate
November Weather4°C (40°F)96 mm (3.8 inches)80%moderate
December Weather-3°C (27°F)70 mm (2.8 inches)79%low

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