Best year time to visit Helena

General weather information about Helena

Average annual temperature is 1.2 °C

Absolute maximum temperature: 27.3 °C

Absolute minimum temperature: -22.5 °C

Number of sunny days: 121 days

Number of rainy days: 156 days

Number of snow days: 88 days

Look at detailed online map of Helena

* Weather data for Helena United States is based on climate observations for 2026 year

Helena air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)-0.3-1.60.213.618.620.827.327.218.915.42.71.8
Average daytime temperature (°C)-6.1-6.0-4.61.210.613.922.120.014.07.4-1.1-3.0
Average temperature (°C)-8.8-9.3-8.1-3.15.38.215.814.28.42.4-4.6-6.6
Average night temperature (°C)-10.7-11.7-10.8-6.20.43.49.69.13.8-1.3-7.8-9.6
Absolute minimum temperature (°C)-22.5-16.4-15.6-14.9-5.5-7.13.91.8-3.0-17.1-16.6-21.7

Helena monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.210.411.913.514.915.615.214.112.511.09.68.8
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.09.08.0
Sunshine mean duration (h)4.56.46.59.311.712.013.911.410.07.95.94.5
Precipitation (mm)100731761241201081312643596796
Sunny days894673181010151516
Rainy days6276242713212013107
Snow days1717201800000358

Helena - weather forecast by months

Helena weather in januaryHelena weather in februaryHelena weather in marchHelena weather in aprilHelena weather in mayHelena weather in juneHelena weather in julyHelena weather in augustHelena weather in septemberHelena weather in octoberHelena weather in novemberHelena weather in december

Best time to visit Helena:

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

  • May — 11.7(h)
  • June — 12.0(h)
  • July — 13.9(h)
  • August — 11.4(h)

Months with the longest average daylight duration in Helena:

  • June — 15.6(h)

The largest precipitation sum in Helena is at

  • March — 176(mm)
  • April — 124(mm)
  • May — 120(mm)
  • August — 126(mm)

    • Weather forecast in the closest to Helena admin centers

    Weather forecast in the closest towns to Helena

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    Frequently asked questions

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