Weather in Koshi in September

General weather information about Koshi

Average annual temperature is 16.6 °C

Absolute maximum temperature: 35.8 °C

Absolute minimum temperature: -3.2 °C

Number of sunny days: 104 days

Number of rainy days: 255 days

Number of snow days: 6 days

Look at detailed online map of Koshi

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

Koshi air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)15.814.422.022.625.629.633.135.831.324.326.221.5
Average daytime temperature (°C)8.39.315.117.221.525.429.832.127.921.116.711.6
Average temperature (°C)6.16.511.014.018.122.426.928.525.017.913.68.9
Average night temperature (°C)4.03.77.211.015.019.724.225.722.814.710.66.4
Absolute minimum temperature (°C)-3.20.6-0.44.68.215.320.023.418.99.73.40.3

Koshi monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.013.012.011.010.09.0
Daylight mean duration (h)10.110.912.013.114.014.514.313.512.411.310.39.8
Daylight minimum duration (h)9.010.011.012.013.014.013.012.011.010.09.09.0
Sunshine mean duration (h)5.85.98.37.98.88.19.510.08.08.66.65.6
Precipitation (mm)1241109119125514921821519944117152
Sunny days66161513962212116
Rainy days232015151821252928191923
Snow days220000000002

Koshi - weather forecast by months

Koshi weather in januaryKoshi weather in februaryKoshi weather in marchKoshi weather in aprilKoshi weather in mayKoshi weather in juneKoshi weather in julyKoshi weather in augustKoshi weather in septemberKoshi weather in octoberKoshi weather in novemberKoshi weather in december

Best time to visit Koshi:

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

  • August — 10.0(h)

The largest precipitation sum in Koshi is at

  • May — 255(mm)
  • July — 218(mm)
  • August — 215(mm)
  • September — 199(mm)

    • Weather forecast in the closest to Koshi admin centers

    Weather forecast in the closest towns to Koshi

    Explore Koshi

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    Frequently asked questions

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