Chicago has a humid continental climate, classified as Dfb in the Köppen system. The warmest month is June with an average high of 24°C, while the coldest month is December with lows dropping to -9°C. The annual temperature range of 33°C is typical of continental climates with distinct seasons.
The driest month is December with only 3 rain days and 30mm of precipitation. For travellers, December through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 65% to 65% throughout the year.
Best Time to Visit Chicago
Based on temperature and rainfall data, the best months to visit Chicago are April, August, May. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
In June, Chicago experiences average highs of 24°C (75°F) and lows of 12°C (54°F). Expect around 6 rainy days and 7 hours of sunshine per day, with humidity averaging 65%. The 12°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 9, so sun protection is advisable on clear days.
Chicago typically sees 6 rainy days in June, with total precipitation of around 70mm. This makes June one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Chicago typically sees 4-6 fewer rain days than June.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Chicago in June. Daytime temperatures of 24°C are pleasant, but the evening drop to 12°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 6 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
June is a reasonable time to visit Chicago. Expect 6 rainy days, so pack a light rain layer for flexibility. Average temperatures of 24°C make outdoor exploration comfortable during the dry periods. With 7 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Chicago in June is 24°C (75°F), and the average low is 12°C (54°F). The mean daily temperature is approximately 18°C (64°F). The day-to-night range of 12°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Chicago is generally May. May offers the most sunshine at 7 hours per day and only 6 rainy days. Average temperatures reach 22°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around May gives you the best chance of dry, bright weather.
June is shoulder or low season in Chicago, meaning fewer tourists and generally lower prices than peak months. With 7 sunshine hours and 6 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In June, Chicago suits a range of activities thanks to mild temperatures around 24°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 7 hours of sunshine, parks and waterfront walks are particularly enjoyable.