Weather in Index in September

General weather information about Index

Average annual temperature is 10.5 °C

Absolute maximum temperature: 33.6 °C

Absolute minimum temperature: -8.5 °C

Number of sunny days: 153 days

Number of rainy days: 203 days

Number of snow days: 9 days

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

Index air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.111.217.528.330.529.430.033.627.727.916.313.4
Average daytime temperature (°C)7.26.810.012.221.121.625.726.420.716.611.28.9
Average temperature (°C)4.12.74.66.914.715.318.919.715.111.66.55.7
Average night temperature (°C)1.90.00.93.09.610.112.513.910.98.33.83.6
Absolute minimum temperature (°C)-6.5-8.5-7.7-2.63.75.28.29.04.7-1.2-2.2-1.7

Index monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.015.016.015.014.013.011.09.08.0
Daylight mean duration (h)8.910.211.913.715.215.915.614.212.610.89.38.5
Daylight minimum duration (h)8.09.011.012.014.015.015.013.011.010.08.08.0
Sunshine mean duration (h)3.33.86.95.99.810.712.911.38.06.34.72.7
Precipitation (mm)15819715418140441536142115227366
Sunny days5764161827201314167
Rainy days22182326151241117171424
Snow days432000000000

Index - weather forecast by months

Index weather in januaryIndex weather in februaryIndex weather in marchIndex weather in aprilIndex weather in mayIndex weather in juneIndex weather in julyIndex weather in augustIndex weather in septemberIndex weather in octoberIndex weather in novemberIndex weather in december

Best time to visit Index:

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

  • May — 9.8(h)
  • June — 10.7(h)
  • July — 12.9(h)
  • August — 11.3(h)

Months with the longest average daylight duration in Index:

  • June — 15.9(h)
  • July — 15.6(h)

The largest precipitation sum in Index is at

  • February — 197(mm)
  • April — 181(mm)
  • November — 227(mm)
  • December — 366(mm)

    • Weather forecast in the closest to Index admin centers

    Weather forecast in the closest towns to Index

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    Frequently asked questions

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