Chicago weather in August
Chicago in August averages 24°C (74°F) and 104 mm of rain.
Of the twelve months in Chicago, August is the second warmest and the fourth wettest.
- Average temp
- 24°C (74°F)
19–28°C · 66–83°F
- Rainfall
- 104 mm
Showers likely
- Sunshine
- —
- Wind
- 12 km/h
What is Chicago like in August?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Some rain is likely; pack for showers.
Evening
Evenings stay warm.
What should I pack for Chicago in August?
Loose cotton or linen
Synthetics stop working once you are sweating through them all day.
A refillable water bottle
Daily highs this warm need roughly double the water a temperate day does.
A light rain jacket
About 104 mm falls this month — showers rather than washouts.
August compared with July and September
August in Chicago is 1°C cooler than July and about as wet as it, which averages 25°C (76°F).
August in Chicago is 4°C warmer than September and 19 mm wetter than it, which averages 20°C (67°F).
Daylight in Chicago in August
On 15 August the sun is up for 13 hours 51 minutes in Chicago, rising about 05:59 and setting about 19:49 local time.
August ends 1 hour 14 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour 22 minutes short of June, the longest-lit month here.
Where to stay in Chicago
Dates are a starting point for August.
Travel guides for Chicago
What to read before you book.
Chicago weather by month
TemperatureRainfall
How August compares with the rest of the year
August is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | -3°C / 26°F | 58 mm |
| February | -1°C / 29°F | 54 mm |
| March | 4°C / 39°F | 68 mm |
| April | 10°C / 50°F | 105 mm |
| May | 16°C / 62°F | 121 mm |
| June | 22°C / 72°F | 115 mm |
| July | 25°C / 76°F | 102 mm |
| August | 24°C / 74°F | 104 mm |
| September | 20°C / 67°F | 85 mm |
| October | 13°C / 55°F | 98 mm |
| November | 6°C / 42°F | 69 mm |
| December | 0°C / 31°F | 59 mm |
Similar weather in August
Other destinations whose August averages sit close to this one.
Check another month
This is the month you are reading. Change either side to look at another.
FAQs about Chicago in August
August climate averages for Chicago, 1991–2020.
Chicago averages 24°C (74°F) in August, ranging from about 19°C (66°F) at night to 28°C (83°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 104 mm falls across August, enough to need a light jacket but not enough to reshape a trip.
Yes. August averages 24°C (74°F) against 20°C (67°F) in September — 4°C warmer.
August is 1°C cooler than July, and about as wet.
Yes. August falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what August is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 13 hours 51 minutes of daylight in mid-August, against 15 hours 13 minutes in June and 9 hours 9 minutes in December.
On 15 August, sunrise is about 05:59 and sunset about 19:49 local time. Both shift across the month — the month ends 1 hour 14 minutes shorter than it starts.
