Chicago in August
In August, Chicago has 108.0 mm (4.25 in) of rain, a daily high of 28.1 °C (82.6 °F) and a daily low of 18.4 °C (65.1 °F), as 1991-2020 means; figures in brackets are converted.
Last updated : what the month is like; shorter source notes.
Best time to visit Chicago: August is a near miss for our rule: days are 0.1 °C over our 28 °C. Expect days that shorten by 1 h 14 min.
What August is like in Chicago
- Pilots do stunts above Lake Michigan at the Chicago Air and Water Show in mid-August. North Avenue Beach is the center of the show. Source: Choose Chicago (official tourism site), checked .
- Marching bands, drill teams and floats head down King Drive in Bronzeville for the Bud Billiken Parade in early August. Source: Choose Chicago (official tourism site), checked .
- Live music plays and guided hikes wind through the preserve at Monarch Palooza in late August. This yearly party for the monarch butterfly is at North Park Village Nature Center. Source: Chicago Park District, checked .
Key figures
Weather in August, 1991-2020 means
- Daily high
- 28.1 °C (82.6 °F)
- Daily low
- 18.4 °C (65.1 °F)
- Rain
- 108.0 mm (4.25 in) in the month
- Sunshine
- no data
U.S. Climate Normals 1991-2020, NOAA. Checked .
Measured at Chicago O'Hare International Airport, 28 km north-west of the city centre point.
How we define and convert these figures
Notes. Daily high and low: changed: source gives °F; converted to °C, rounded to 0.1. Rain: changed: source gives inches; converted to mm (x 25.4), rounded to 0.1. Sunshine: the NOAA U.S. monthly normals have no sunshine measure.
Daylight on 15 August 2026
- Sunrise
- 05:59 local time
- Sunset
- 19:50 local time
- Day length
- 13 h 52 min
Day length 1-31 August: 14 h 24 min to 13 h 10 min, -1 h 14 min.
Source: NOAA Solar Calculator equations, checked .
Month by month
Each month: daily high in °C, then rain in mm, 1991-2020 means.
NOAA U.S. Climate Normals 1991-2020, as above, checked .
This month against the year
| Measure | August | Rank |
|---|---|---|
| Daily high | 28.1 °C | 2nd warmest |
| Daily low | 18.4 °C | 2nd warmest |
| Rain | 108.0 mm | 2nd wettest |
| Sunshine | no data | no data |
| Day length | 13 h 52 min | 4th longest |
Equal values share a rank. How we rank months
NOAA U.S. Climate Normals 1991-2020, as above, checked .
Day length: NOAA solar equations, checked .
Public holidays this month
August 2026: none.
August 2027: none.
Typed from the official list and re-checked, .
Source: Official public holiday list (cms.illinois.gov), checked .
Same month in 20 cities
Chicago is warmer than 8 of our 20 cities in August by mean daily high. How we rank cities
Closest high and low in August: Los Angeles (0.5 °C apart), New York (1.3), Vienna (2.4).
| City | Gap from Chicago, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Chicago (this page) | — | 28.1 | 18.4 | 108.0 | no data |
| Los Angeles (closest) | 0.5 | 28.9 | 18.6 | 0.0 | no data |
| New York (closest) | 1.3 | 28.5 | 20.5 | 115.8 | no data |
| Vienna (closest) | 2.4 | 26.1 | 15.6 | 69.1 | 266.3 |
| Paris | 2.5 | 25.6 | 16.0 | 58.0 | 215.0 |
| Rome | 2.5 | 31.6 | 19.8 | no data | no data |
| Barcelona | 2.7 | 29.7 | 22.1 | 51.2 | 258.2 |
| Madrid | 2.7 | 32.6 | 19.3 | 10.4 | no data |
| Berlin | 3.5 | 24.9 | 14.7 | 58.1 | 221.3 |
| Prague | 3.5 | 25.7 | 13.8 | 76.2 | 230.4 |
| Munich | 3.7 | 24.7 | 14.5 | 116.5 | 232.1 |
| Tokyo | 4.2 | 31.3 | 23.5 | 154.7 | 174.2 |
| London | 4.3 | 23.3 | 14.6 | 54.9 | no data |
| Seville | 4.9 | 35.6 | 20.6 | 2.5 | 364.3 |
| Singapore | 5.1 | 31.4 | 25.3 | 146.9 | no data |
| Amsterdam | 5.4 | 22.4 | 13.4 | 98.6 | 203.5 |
| Hiroshima | 5.7 | 32.8 | 25.1 | 131.4 | 207.3 |
| Hong Kong | 5.8 | 31.3 | 26.7 | 453.2 | 182.1 |
| Osaka | 6.5 | 33.7 | 25.8 | 113.0 | 222.4 |
| Buenos Aires | 9.9 | 17.9 | 8.9 | 70.3 | 171.6 |
Sources (1991-2020): WMO climate normals and NOAA U.S. Climate Normals, checked , ; Hong Kong: our 1991-2020 mean of the Hong Kong Observatory daily climate series on DATA.GOV.HK; Singapore: our 1991-2020 mean of the National Environment Agency monthly climate series on data.gov.sg; both checked . Each city's page names its station. All sources in full on Methodology.
Hong Kong figures: The Government of the Hong Kong Special Administrative Region and the Hong Kong Observatory own the intellectual property rights in the data; attribution to them and DATA.GOV.HK. Licence: Terms and Conditions of Use of DATA.GOV.HK, version 1.2.
Singapore figures: Contains information from the National Environment Agency on data.gov.sg, made available under the terms of the Singapore Open Data Licence version 1.0 (https://data.gov.sg/open-data-licence). The Agency does not endorse our means.
Sources
- Attribution: Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). Station files named in each record. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/wck8-er13. Accessed on the check date shown. Licence: No licence stated; citation requested. Checked .
- NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked .
Official sources
Cite this page: City by Month. "Chicago in August: weather, daylight, holidays". https://citybymonth.com/cities/united-states/chicago/august/. Last updated 5 November 2026.