Marion weather in August 2025

Expect daytime maximum temperatures of 31°C in Marion, Illinois in August and high heat and humidity based on long-term weather averages. There are 10 hours of sunshine per day on average with typically 88 mm of rainfall in the month.

  • 31°C maximum daytime temperature in August in Marion31
    31°C max day temperature
  • 10 hours of sunshine per day
  • 8 days with some rainfall in August in Marion8
    8 days with some rainfall
  • 18°C minimum night-time temperature in August in Marion18
    18°C min night temperature
  • 14 hours of daylight per day in August in Marion14
    14 hours of daylight per day
  • High heat & humidity in August in MarionH
    High heat & humidity
  • 88 mm monthly rainfall in August in Marion88
    88 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in August in Marion9
    9 (Very High) UV index

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The August weather guide for Illinois (Marion) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Marion in August?

Daytime temperatures usually reach 31°C in Marion in August with high heat and humidity, falling to 18°C at night.

How sunny is it in Marion in August?

There are normally 10 hours of bright sunshine each day in Marion in August - that's 70% of daylight hours.

Does it rain in Marion in August?

There are usually 8 days with some rain in Marion in August and the average monthly rainfall is 88mm.

Marion August sunrise & sunset times

Browse the sunrise and sunset times for Marion in August 2025. Select a month to view Marion sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:00 19:04
Saturday, 16th August 2025 05:12 18:47
Sunday, 31st August 2025 05:25 18:26

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