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April Weather in Koriyama, Japan

Last updated: August 23, 2025

In April, the average temperature in Koriyama, Japan hovers around 10°C (50°F), with a tantalizing range that can dip as low as -3°C (28°F) and soar up to 27°C (81°F). Visitors can expect a moderate amount of rainfall, accumulating to 99 mm (3.9 in) over approximately 13 days. The air is generally fairly humid, with an average humidity level of 73%, adding a touch of moisture to the atmosphere.

April Temperature in Koriyama

In April in Koriyama, the average temperature is 10°C (50°F), with maximums reaching 27°C (81°F) and minimums dropping as low as -3°C (28°F). This variability in temperatures makes it essential for travelers to pack accordingly for both warm and cold conditions.

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

The chart illustrates April temperature patterns in Koriyama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koriyama, April typically has an average temperature of 10°C (50°F), with highs reaching up to 27°C (81°F) and lows dropping to around -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec323441506167747768584736
Data source: Temperature data for Koriyama 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 Koriyama

In Koriyama in April, the precipitation amount is 99 mm (3.9 in) over the course of 13 days.

April Precipitation Trends in Koriyama

The chart displays monthly precipitation patterns in Koriyama, 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 Koriyama, April typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec5344110991031002251231391903862
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Koriyama

In Koriyama in April, humidity is 73%. With an average temperature of 10°C (50°F), this humidity feels like a chilly, damp embrace, making it essential to layer your clothing while traveling, as the moisture in the air can quickly chill you to the bone.

April Average Humidity in Koriyama

This chart illustrates the average monthly humidity levels in Koriyama, 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 Koriyama is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Koriyama

In Koriyama 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 Koriyama.

Maximum UV Index Levels in Koriyama for April

The chart shows the monthly maximum UV Index (UVI) for Koriyama 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 Koriyama typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111119653
Data source: Koriyama 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 Koriyama Compares to Other Months

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

This table compares monthly weather conditions in Koriyama, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)53 mm (2.1 inches)76%moderate
February Weather1°C (34°F)44 mm (1.7 inches)75%moderate
March Weather5°C (42°F)110 mm (4.3 inches)72%high
April Weather10°C (50°F)99 mm (3.9 inches)73%very high
May Weather16°C (61°F)102 mm (4.0 inches)80%very high
June Weather19°C (67°F)100 mm (3.9 inches)87%extreme
July Weather23°C (74°F)225 mm (8.8 inches)92%extreme
August Weather25°C (77°F)123 mm (4.8 inches)90%extreme
September Weather20°C (68°F)139 mm (5.5 inches)84%very high
October Weather14°C (58°F)190 mm (7.5 inches)80%high
November Weather8°C (47°F)38 mm (1.5 inches)77%moderate
December Weather2°C (37°F)62 mm (2.4 inches)77%moderate

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