Best year time to visit Koizumi

General weather information about Koizumi

Average annual temperature is 13.6 °C

Absolute maximum temperature: 36.9 °C

Absolute minimum temperature: -8.4 °C

Number of sunny days: 100 days

Number of rainy days: 248 days

Number of snow days: 17 days

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

Koizumi air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)15.211.822.722.429.429.433.436.931.623.924.116.4
Average daytime temperature (°C)4.85.412.915.420.024.629.033.027.219.013.97.8
Average temperature (°C)1.62.17.610.915.320.324.827.823.114.510.24.4
Average night temperature (°C)-1.1-1.13.37.011.617.121.123.620.210.97.21.4
Absolute minimum temperature (°C)-8.4-6.0-4.32.64.314.016.921.315.46.0-2.2-8.1

Koizumi monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.012.011.010.09.0
Daylight mean duration (h)9.910.812.013.214.214.714.413.612.411.210.29.6
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.36.08.68.38.99.09.911.37.98.56.54.6
Precipitation (mm)12010710315218925019110919599162213
Sunny days35151415710104764
Rainy days221516161623212126242424
Snow days680000000003

Koizumi - weather forecast by months

Koizumi weather in januaryKoizumi weather in februaryKoizumi weather in marchKoizumi weather in aprilKoizumi weather in mayKoizumi weather in juneKoizumi weather in julyKoizumi weather in augustKoizumi weather in septemberKoizumi weather in octoberKoizumi weather in novemberKoizumi weather in december

Best time to visit Koizumi:

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

  • July — 9.9(h)
  • August — 11.3(h)

The largest precipitation sum in Koizumi is at

  • June — 250(mm)
  • December — 213(mm)

    • Weather forecast in the closest to Koizumi admin centers

    Weather forecast in the closest towns to Koizumi

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    Frequently asked questions

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