Best year time to visit Ostronsaari

General weather information about Ostronsaari

Average annual temperature is 3.8 °C

Absolute maximum temperature: 28.4 °C

Absolute minimum temperature: -18.4 °C

Number of sunny days: 109 days

Number of rainy days: 164 days

Number of snow days: 92 days

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

Ostronsaari air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)1.72.23.515.521.624.624.128.421.111.32.21.6
Average daytime temperature (°C)-3.1-3.7-1.86.914.318.818.320.416.43.5-2.6-6.3
Average temperature (°C)-4.8-5.7-4.41.49.914.415.216.813.31.3-4.1-7.8
Average night temperature (°C)-6.5-7.6-7.0-2.74.79.211.613.010.1-0.7-5.6-9.2
Absolute minimum temperature (°C)-18.4-16.6-15.3-9.5-3.11.06.96.76.1-8.9-14.9-16.0

Ostronsaari monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)7.010.013.016.019.019.019.017.014.011.08.05.0
Daylight mean duration (h)6.28.811.814.917.919.818.816.013.09.97.05.2
Daylight minimum duration (h)5.07.010.013.016.019.017.014.011.08.05.04.0
Sunshine mean duration (h)0.51.84.510.712.114.38.510.05.93.20.20.1
Precipitation (mm)723088284790187109137976347
Sunny days12662112125851156
Rainy days8176181826232516124
Snow days11211831000041321

Ostronsaari - weather forecast by months

Ostronsaari weather in januaryOstronsaari weather in februaryOstronsaari weather in marchOstronsaari weather in aprilOstronsaari weather in mayOstronsaari weather in juneOstronsaari weather in julyOstronsaari weather in augustOstronsaari weather in septemberOstronsaari weather in octoberOstronsaari weather in novemberOstronsaari weather in december

Best time to visit Ostronsaari:

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

  • April — 10.7(h)
  • May — 12.1(h)
  • June — 14.3(h)
  • July — 8.5(h)
  • August — 10.0(h)

Months with the longest average daylight duration in Ostronsaari:

  • May — 17.9(h)
  • June — 19.8(h)
  • July — 18.8(h)
  • August — 16.0(h)

The largest precipitation sum in Ostronsaari is at

  • July — 187(mm)
  • August — 109(mm)
  • September — 137(mm)

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    Weather forecast in the closest towns to Ostronsaari

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    Frequently asked questions

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