Illinois weather in August 2019

  • 28°C maximum daytime temperature in August in Illinois (Chicago)28
    28°C max day temperature
  • 9 hours of sunshine per day
  • 9 days with some rainfall in August in Illinois (Chicago)9
    9 days with some rainfall
  • 16°C minimum night-time temperature in August in Illinois (Chicago)16
    16°C min night temperature
  • 14 hours of daylight per day in August in Illinois (Chicago)14
    14 hours of daylight per day
  • Moderate heat & humidity in August in Illinois (Chicago)M
    Moderate heat & humidity
  • 97 mm monthly rainfall in August in Illinois (Chicago)97
    97 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Illinois (Chicago)8
    8 (Very High) UV index
  • 21°C sea temperature in August in Illinois (Chicago)21
    21°C sea temperature

Going to Illinois? Find the best month to visit Illinois based on the weather.

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Expect 28°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Illinois in August. Check more long-term weather averages for Illinois in August before you book your next holiday to Illinois in 2019/2020. The August weather averages shown above are for Chicago.

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More about Illinois

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The August weather guide for Illinois, represented by Chicago, 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)

Guide to Illinois weather in August

The average maximum daytime temperature in Illinois in August is a warm 28°C (82°F) with moderate heat & humidity. The average night-time temperature is usually a comfortable 16°C (61°F). There are usually 9 hours of bright sunshine each day, which represents 67% of the 14 hours of daylight.

Expect 97mm (3.8 inches) of rainfall across the whole of August with 9 days with some rain falling. Maximum UV levels will be very high (8 UV index) at midday when the skies are clear.

The average sea temperature in and around Illinois in August is 21°C (70°F).

The weather in Illinois in August is represented by Chicago.

Illinois sunrise & sunset times for August 2019

Browse the sunrise & sunset times for Illinois in August 2019. Select a month to view Illinois sunrise & sunset times for the next twelve months. The Illinois sunrise & sunset times shown below are for Chicago.


Date Sunrise times Sunset times
Thursday, 1st August 2019 05:44 20:09
Friday, 2nd August 2019 05:45 20:08
Saturday, 3rd August 2019 05:46 20:07
Sunday, 4th August 2019 05:47 20:05
Monday, 5th August 2019 05:48 20:04
Tuesday, 6th August 2019 05:49 20:03
Wednesday, 7th August 2019 05:50 20:02
Thursday, 8th August 2019 05:51 20:00
Friday, 9th August 2019 05:52 19:59
Saturday, 10th August 2019 05:53 19:58
Sunday, 11th August 2019 05:54 19:57
Monday, 12th August 2019 05:55 19:55
Tuesday, 13th August 2019 05:56 19:54
Wednesday, 14th August 2019 05:57 19:52
Thursday, 15th August 2019 05:58 19:51
Friday, 16th August 2019 05:59 19:50
Saturday, 17th August 2019 06:00 19:48
Sunday, 18th August 2019 06:02 19:47
Monday, 19th August 2019 06:03 19:45
Tuesday, 20th August 2019 06:04 19:44
Wednesday, 21st August 2019 06:05 19:42
Thursday, 22nd August 2019 06:06 19:40
Friday, 23rd August 2019 06:07 19:39
Saturday, 24th August 2019 06:08 19:37
Sunday, 25th August 2019 06:09 19:36
Monday, 26th August 2019 06:10 19:34
Tuesday, 27th August 2019 06:11 19:33
Wednesday, 28th August 2019 06:12 19:31
Thursday, 29th August 2019 06:13 19:29
Friday, 30th August 2019 06:14 19:28
Saturday, 31st August 2019 06:15 19:26
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