Weather in Isomäki in September

General weather information about Isomäki

Average annual temperature is 4.5 °C

Absolute maximum temperature: 29.0 °C

Absolute minimum temperature: -18.5 °C

Number of sunny days: 134 days

Number of rainy days: 164 days

Number of snow days: 67 days

Look at detailed online map of Isomäki

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

Isomäki air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)4.05.54.616.423.028.724.829.022.712.74.93.9
Average daytime temperature (°C)-1.3-0.8-1.07.814.720.519.520.316.74.2-1.5-4.6
Average temperature (°C)-3.0-3.4-4.71.79.715.715.916.513.41.4-3.5-6.5
Average night temperature (°C)-5.0-6.3-8.8-3.64.19.612.012.710.0-1.2-5.9-8.9
Absolute minimum temperature (°C)-14.2-14.8-15.6-14.1-3.31.310.38.93.2-7.8-18.2-18.5

Isomäki monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)7.010.013.016.019.020.020.017.014.011.08.05.0
Daylight mean duration (h)5.88.711.815.018.220.319.216.213.09.86.84.8
Daylight minimum duration (h)4.07.010.013.016.019.017.014.011.08.05.04.0
Sunshine mean duration (h)1.22.95.39.512.314.611.39.86.24.80.50.4
Precipitation (mm)642649574929135140113805436
Sunny days111212221514265141011
Rainy days1145814162925251593
Snow days9121402000021117

Isomäki - weather forecast by months

Isomäki weather in januaryIsomäki weather in februaryIsomäki weather in marchIsomäki weather in aprilIsomäki weather in mayIsomäki weather in juneIsomäki weather in julyIsomäki weather in augustIsomäki weather in septemberIsomäki weather in octoberIsomäki weather in novemberIsomäki weather in december

Best time to visit Isomäki:

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

  • April — 9.5(h)
  • May — 12.3(h)
  • June — 14.6(h)
  • July — 11.3(h)
  • August — 9.8(h)

Months with the longest average daylight duration in Isomäki:

  • May — 18.2(h)
  • June — 20.3(h)
  • July — 19.2(h)
  • August — 16.2(h)

The largest precipitation sum in Isomäki is at

  • July — 135(mm)
  • August — 140(mm)
  • September — 113(mm)

    • Weather forecast in the closest to Isomäki admin centers

    Weather forecast in the closest towns to Isomäki

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    Frequently asked questions

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