Best year time to visit Onkalo

General weather information about Onkalo

Average annual temperature is 3.0 °C

Absolute maximum temperature: 28.8 °C

Absolute minimum temperature: -24.2 °C

Number of sunny days: 142 days

Number of rainy days: 145 days

Number of snow days: 78 days

Look at detailed online map of Onkalo

* Weather data for Onkalo Finland is based on climate observations for 2026 year

Onkalo air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)4.54.02.313.018.025.123.528.819.011.23.11.8
Average daytime temperature (°C)-2.2-3.0-4.04.38.917.218.719.314.62.5-2.6-5.5
Average temperature (°C)-4.3-5.5-7.20.15.613.815.716.412.30.3-4.8-7.2
Average night temperature (°C)-6.8-8.3-10.7-3.91.69.812.113.39.4-1.8-7.1-9.6
Absolute minimum temperature (°C)-17.7-16.6-24.2-11.3-3.93.08.37.81.6-9.7-16.4-16.9

Onkalo monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)6.09.013.017.021.023.022.018.014.011.07.04.0
Daylight mean duration (h)4.98.311.815.319.122.520.616.713.19.66.03.5
Daylight minimum duration (h)3.06.010.013.017.021.018.014.011.07.04.03.0
Sunshine mean duration (h)0.92.26.510.613.014.912.110.86.44.00.70.0
Precipitation (mm)80274348498095133165974737
Sunny days111292020148103131111
Rainy days1042610162321271493
Snow days10122041000041017

Onkalo - weather forecast by months

Onkalo weather in januaryOnkalo weather in februaryOnkalo weather in marchOnkalo weather in aprilOnkalo weather in mayOnkalo weather in juneOnkalo weather in julyOnkalo weather in augustOnkalo weather in septemberOnkalo weather in octoberOnkalo weather in novemberOnkalo weather in december

Best time to visit Onkalo:

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

  • April — 10.6(h)
  • May — 13.0(h)
  • June — 14.9(h)
  • July — 12.1(h)
  • August — 10.8(h)

Months with the longest average daylight duration in Onkalo:

  • May — 19.1(h)
  • June — 22.5(h)
  • July — 20.6(h)
  • August — 16.7(h)

The largest precipitation sum in Onkalo is at

  • July — 95(mm)
  • August — 133(mm)
  • September — 165(mm)
  • October — 97(mm)

    • Weather forecast in the closest to Onkalo admin centers

    Weather forecast in the closest towns to Onkalo

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    Frequently asked questions

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