July 31 is generally a great time to visit Chicago. While there is a slight chance of rain (25%), showers are usually brief. Expect comfortable 27°C weather. Chicago is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Chicago
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
The first Internet café in the United St...
Safety
Moderate Safety
GPI: 2.44
Chicago Weather Forecast for July 31
"Warm & Sunny. Expect average highs of 26.5°C. 25% chance of rain."
What to Wear in Chicago in July
Based on historical data for July 31, Chicago typically experiences temperatures between 19.9°C and 26.5°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (25% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Chicago
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
26.5°C
Daytime Peak
Average Low
19.9°C
Nighttime Low
Feels Like
27.5°C
☀️ Minor difference
Rain Chance
25%
Avg 1.7mm if it rains
Cloud Cover
43%
Overcast
Pressure
1016.2 hPa
Medium volatility
Chicago Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 91% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
04:00 - 10:00
16:00 - 19:00
Type I-II
🔴 13 min to burn
Type III-IV
🟡 20 min to burn
Type V-VI
🟢 33 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
21°C
Humid/Sticky
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Morning hours (before 11 AM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
92/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~1,256
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Chicago
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:44
☀️ Noon
11:58
🌇 Sunset
19:11
⏱️ Daylight
14h 27m
Wind Speed
16.7 km/h
Gentle breeze
Sunshine
11.8 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Chicago
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Chicago
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Chicago on July 31 averages 26.5°C with a 25% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Chicago Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (July 31) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Chicago Worth Visiting on July 31?
Planning a trip to Chicago on July 31? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 26.5°C with a 25% historical precipitation risk.
✈️ Travel Logistics: Approximately 1,256 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest July 31 recorded in the last 30 years saw temperatures hit 31.4°C in 2024, while the coldest dropped to 14.9°C in 2021.