The Chicago historical weather page is built for travel planning and destination comparison, covering monthly temperature, rainfall, rainy days, and sunshine trends from 2015 through the latest complete month. Best time to visit Chicago. Searches for the best time to visit Chicago usually need monthly temperature, rainfall, and rainy-day context. Use the month-by-month view to find comfortable travel windows instead of relying only on annual averages. Chicago average temperature by month. For queries such as Chicago weather in April, Chicago temperature in August, or Chicago historical rainfall, start with the monthly pattern and then compare specific years when timing matters. How to read Chicago weather patterns. Chicago, Illinois sits in a temperate climate band. Check the full monthly range because the warmer season (June to August) and cooler season (December to February) can feel very different for travel planning. Chicago rainfall and seasonality. For outdoor plans in Chicago, compare both total rainfall and rainy days by month. Shoulder periods (March-May and September-November) are useful for balancing temperature comfort, rainfall risk, and travel demand. When to compare Chicago with other destinations. If you are choosing between several cities, compare Chicago with nearby destinations in the same month. This avoids relying only on annual averages and makes temperature and precipitation differences clearer.
Chicago Historical Weather Since 2015 | Latest Complete Month Data
Chicago historical weather from 2015 through the latest complete month: monthly temperature, rainfall, sunshine, yearly comparisons, and travel timing references. The Chicago historical weather page is built for travel planning and destination comparison, covering monthly temperature, rainfall, rainy days, and sunshine trends from 2015 through the latest complete month. Best time to visit Chicago. Searches for the best time to visit Chicago usually need monthly temperature, rainfall, and rainy-day context. Use the month-by-month view to find comfortable travel windows instead of relying only on annual averages. Chicago average temperature by month. For queries such as Chicago weather in April, Chicago temperature in August, or Chicago historical rainfall, start with the monthly pattern and then compare specific years when timing matters. How to read Chicago weather patterns. Chicago, Illinois sits in a temperate climate band. Check the full monthly range because the warmer season (June to August) and cooler season (December to February) can feel very different for travel planning. Chicago rainfall and seasonality. For outdoor plans in Chicago, compare both total rainfall and rainy days by month. Shoulder periods (March-May and September-November) are useful for balancing temperature comfort, rainfall risk, and travel demand. When to compare Chicago with other destinations. If you are choosing between several cities, compare Chicago with nearby destinations in the same month. This avoids relying only on annual averages and makes temperature and precipitation differences clearer. Chicago historical weather from 2015 through the latest complete month: monthly temperature, rainfall, sunshine, yearly comparisons, and travel timing references.
Chicago monthly fact table
These facts are generated from historical monthly averages for 2015-01-01/2026-05-31, ready for best-month, rainy-season, hottest-month, and coldest-month answers.
- Recommended month: September
- Hottest month: July
- Coldest month: January
- Rainiest month: July
| Month | Avg Temp | Precip | Rainy Days | Sunshine |
|---|
| January | -3.7°C | 63 mm | 15.3 | 5.1 h |
| February | -2.2°C | 53 mm | 11.8 | 6.8 h |
| March | 3.4°C | 89 mm | 15.5 | 7.8 h |
| April | 8.5°C | 104 mm | 17.1 | 8.8 h |
| May | 14.3°C | 119 mm | 16.7 | 10.2 h |
| June | 20.6°C | 112 mm | 16 | 11.7 h |
| July | 23°C | 148 mm | 17.3 | 11.8 h |
| August | 22.6°C | 101 mm | 16.9 | 11.6 h |
| September | 19.8°C | 91 mm | 12.7 | 9.8 h |
| October | 12.9°C | 117 mm | 14.5 | 7.6 h |
| November | 5.5°C | 64 mm | 12.4 | 6 h |
| December | 0.2°C | 68 mm | 13.1 | 4.9 h |
Source: Open-Meteo Archive; generated: 2026-06-07.
Chicago historical weather travel guide
When is the best time to visit Chicago?
Based on historical monthly averages for 2015-01-01/2026-05-31, the recommended month for Chicago is September, with an average temperature around 19.8°C, average precipitation around 91 mm, and a travel comfort score of 93.
Is it hot in Chicago in summer?
The hottest month in Chicago historical averages is July, with an average temperature around 23.0°C and an average high around 26.8°C. For summer trips, check rainfall and heat precautions together.
When is the rainy season in Chicago?
Rain is most concentrated in Chicago during May, July, October. The rainiest month is July, with average precipitation around 148 mm and about 17.3 rainy days.
What is the coldest month in Chicago?
The coldest month in Chicago historical averages is January, with an average temperature around -3.7°C and an average low around -7.0°C. Prepare warm clothing for winter travel.