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April Weather in Sanmu, Japan

Last updated: August 23, 2025

In April, the average temperature in Sanmu, Japan hovers around 14°C (58°F), with a minimum of 3°C (38°F) and soaring to a maximum of 26°C (78°F). Expect around 112 mm (4.4 in) of precipitation spread over 11 days, while the air carries an average humidity of 73%. Whether you're preparing for a rainy day or enjoying the milder temperatures, it's a month that invites both cozy indoors and refreshing outdoor adventures!

April Temperature in Sanmu

In April in Sanmu, the average temperature is 14°C (58°F). Maximums can reach 26°C (78°F) and minimums can be as low as 3°C (38°F). This weather makes it a great time for travelers to enjoy outdoor activities while experiencing the pleasant climate.

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

The chart illustrates April temperature patterns in Sanmu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sanmu, April typically has an average temperature of 14°C (58°F), with highs reaching up to 26°C (78°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec434552586671788175675848
Data source: Temperature data for Sanmu 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 Sanmu

In Sanmu in April, the precipitation amount is 112 mm (4.4 in) that occurs over the course of 11 days.

April Precipitation Trends in Sanmu

The chart displays monthly precipitation patterns in Sanmu, 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 Sanmu, April typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec56521441131321692139517925510981
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Sanmu

In Sanmu in April, humidity is 73%. With an average temperature of 14°C (58°F), this humidity feels like a warm, damp blanket wrapping around you, making outdoor activities a bit uncomfortable for traveling unless you stay hydrated and take frequent breaks in the shade.

April Average Humidity in Sanmu

This chart illustrates the average monthly humidity levels in Sanmu, 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 Sanmu is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%69%68%73%81%88%94%87%83%78%74%72%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Sanmu

In Sanmu in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Sanmu.

Maximum UV Index Levels in Sanmu for April

The chart shows the monthly maximum UV Index (UVI) for Sanmu 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 Sanmu typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111119754
Data source: Sanmu 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 Sanmu Compares to Other Months

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

This table compares monthly weather conditions in Sanmu, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)56 mm (2.2 inches)70%moderate
February Weather7°C (45°F)52 mm (2.0 inches)69%moderate
March Weather11°C (52°F)144 mm (5.7 inches)68%very high
April Weather14°C (58°F)112 mm (4.4 inches)73%very high
May Weather19°C (67°F)132 mm (5.2 inches)81%extreme
June Weather22°C (72°F)169 mm (6.7 inches)88%extreme
July Weather26°C (78°F)213 mm (8.4 inches)94%extreme
August Weather27°C (82°F)95 mm (3.8 inches)87%extreme
September Weather24°C (75°F)179 mm (7.0 inches)83%very high
October Weather19°C (67°F)255 mm (10.0 inches)78%high
November Weather14°C (58°F)109 mm (4.3 inches)74%moderate
December Weather9°C (48°F)81 mm (3.2 inches)72%moderate

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