Weather in Koiso in April

General weather information about Koiso

Average annual temperature is 12.7 °C

Absolute maximum temperature: 34.5 °C

Absolute minimum temperature: -10.2 °C

Number of sunny days: 74 days

Number of rainy days: 240 days

Number of snow days: 51 days

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* Weather data for Koiso Japan is based on climate observations for 2026 year

Koiso air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)10.88.820.619.222.226.329.334.531.421.822.813.7
Average daytime temperature (°C)1.22.29.312.917.322.425.631.326.017.811.84.5
Average temperature (°C)-0.70.56.29.914.119.923.628.422.914.99.12.4
Average night temperature (°C)-2.5-1.33.57.511.617.721.826.020.412.76.40.3
Absolute minimum temperature (°C)-10.2-6.3-1.91.94.912.717.323.813.96.2-1.7-5.5

Koiso monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.710.711.913.314.415.014.713.712.511.110.09.3
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.35.88.08.79.78.59.312.07.77.75.13.6
Precipitation (mm)15514011623020016241291190222334185
Sunny days0212613105108620
Rainy days101217241820262122252520
Snow days211420000000311

Koiso - weather forecast by months

Koiso weather in januaryKoiso weather in februaryKoiso weather in marchKoiso weather in aprilKoiso weather in mayKoiso weather in juneKoiso weather in julyKoiso weather in augustKoiso weather in septemberKoiso weather in octoberKoiso weather in novemberKoiso weather in december

Best time to visit Koiso:

The best time to visit Koiso during the most sunny months:

  • May — 9.7(h)
  • August — 12.0(h)

The largest precipitation sum in Koiso is at

  • July — 412(mm)
  • November — 334(mm)

    • Weather forecast in the closest to Koiso admin centers

    Weather forecast in the closest towns to Koiso

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    Frequently asked questions

    When is the best time to visit Koiso?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Koiso.
    What is the weather like in Koiso?
    See average temperature, rainfall and daylight hours for Koiso by month in the table above.
    How many sunny days does Koiso have?
    The monthly weather statistics above show sunshine and rainfall patterns for Koiso throughout the year.