When Does It Get Warm In Chicago?

Chicago is famously known for its cold, windy winters. But when do Chicagoland residents finally get a respite from winter chill and welcome warmer sunny days? If you’re looking for a quick answer, here it is: Chicago typically starts to feel warm in May and stays mild through September.

In this in-depth guide, we’ll cover everything you need to know about Chicago’s weather warming up. You’ll learn the average temperature trends by month, when locals consider it “warm,” tips on what to wear, and fun warm-season activities in Chicago. Whether you’re a Windy City resident impatient for spring, a visitor planning a Chicago trip, or just curious about this dynamic Midwest weather, read on to discover when you can expect Chicago to feel warm and summery.

Average Monthly Temperatures

When planning a trip to Chicago or simply wanting to know when it starts to get warm, it’s essential to understand the average monthly temperatures in the city. Chicago experiences a range of temperatures throughout the year, from chilly winters to hot summers.

Let’s take a closer look at when the warm weather arrives in the Windy City.

Spring Warm Up

Spring in Chicago can be quite unpredictable, with temperatures fluctuating between cool and warm. However, as the city emerges from the winter months, temperatures gradually begin to rise. By April, the average high temperature in Chicago reaches around 60°F (15°C), signaling the start of the spring warm-up.

The city starts to come alive with outdoor activities and festivals as locals and tourists alike enjoy the pleasant weather.

Summer Heat

Summer is the season when Chicago truly heats up. By June, the average high temperature soars to around 80°F (27°C), making it the perfect time to head to the beach or explore the city’s vibrant neighborhoods.

July and August are typically the hottest months in Chicago, with temperatures often reaching the mid-80s°F (29-30°C). It’s important to note that the humidity can also be quite high during the summer months, so be prepared for some sticky days.

Chicago’s beautiful parks, outdoor concerts, and festivals make it a fantastic destination to enjoy the summer heat.

Cool Down into Fall

As the summer season comes to an end, Chicago gradually cools down into fall. September sees a gradual decrease in temperature, with the average high dropping to around 70°F (21°C). October brings crisp and cooler weather, with temperatures averaging around 60°F (15°C).

Fall in Chicago is a picturesque time, with the changing colors of the trees and various seasonal activities such as apple picking and visiting pumpkin patches.

It’s important to keep in mind that these are average temperatures, and there can be variations from year to year. For more detailed and up-to-date information on Chicago’s weather and temperatures, you can visit the Weather Channel or the AccuWeather websites.

Whether you’re planning a spring getaway or looking forward to enjoying the summer heat, Chicago has something to offer for every season. From outdoor activities to cultural events, the Windy City provides a vibrant and exciting atmosphere all year round.

Locals’ Definition of ‘Warm’

Ask any Chicagoan about their definition of “warm” and you’re likely to get a variety of responses. After enduring the long, cold winters that the city is known for, locals have their own criteria for when they consider it to be warm.

While some might argue that anything above freezing temperatures qualifies as warm, others may have a higher threshold, requiring temperatures in the 60s or even 70s.

Daytime Highs vs Nighttime Lows

One factor that influences the locals’ definition of “warm” is the difference between daytime highs and nighttime lows. Chicago experiences significant temperature fluctuations throughout the day, with the temperature often dropping dramatically once the sun goes down.

So even if the daytime high reaches a comfortable level, locals may still consider it chilly if the nighttime low falls into the colder range.

Lake Michigan’s Influence

Another factor that plays a role in determining when it gets warm in Chicago is the influence of Lake Michigan. The lake, which borders the city to the east, has a moderating effect on temperatures. In the spring and early summer, when the lake is still relatively cool, a breeze off the lake can make it feel much cooler than the actual temperature.

This can delay the locals’ perception of warm weather, as they may be waiting for the lake to warm up before considering it truly warm in the city.

Humidity and Windchill

Humidity and windchill are two additional factors that impact how warm it feels in Chicago. The city’s proximity to Lake Michigan can result in higher levels of humidity, especially during the summer months.

High humidity can make the air feel heavier and more oppressive, even if the temperature itself is not extremely high. On the other hand, windchill can make the temperature feel much colder than it actually is, particularly during the winter months.

So, even if the thermometer shows a relatively warm temperature, the windchill factor can make it feel much cooler and delay the locals’ perception of warm weather.

What to Wear in Warm Months

May through September Attire

During the warm months in Chicago, from May through September, it’s important to dress appropriately for the rising temperatures. The city experiences a range of weather conditions during this time, from mild spring days to scorching summer heat.

It’s essential to have a versatile wardrobe that can adapt to these fluctuations.

Lightweight and breathable clothing is key to staying comfortable in the summer heat. Opt for materials like cotton or linen that allow your skin to breathe. Loose-fitting clothes can also help to keep you cool by allowing air circulation.

Pro Tip: Don’t forget to wear sunscreen and a hat to protect yourself from the sun’s harmful rays. It’s also a good idea to carry a water bottle with you to stay hydrated throughout the day.

Dressing for Fluctuating Spring Temps

Spring in Chicago can be unpredictable, with fluctuating temperatures and sudden changes in weather. Layering is the key to dressing for this transitional season. Start with a lightweight base layer, such as a t-shirt or blouse, and add on layers that you can easily remove if it gets warmer or add on if it gets cooler.

An easy way to layer is by carrying a light cardigan or jacket with you. This way, you can easily adjust your outfit as needed. Pair your layers with pants or skirts made from breathable fabrics, and don’t forget to bring an umbrella in case of spring showers.

Pro Tip: Check the weather forecast before heading out, as it can help you plan your outfit accordingly. And remember, it’s always better to be prepared for changing conditions!

Handling Summer Heat Waves

Chicago summers can bring intense heat waves, with temperatures soaring into the 90s (°F). When the mercury rises, it’s important to dress in light, breathable fabrics that allow sweat to evaporate and cool your body.

Opt for loose-fitting shorts, skirts, and dresses that provide airflow and help keep you comfortable.

It’s also a good idea to choose light-colored clothing, as dark colors tend to absorb more heat. Don’t forget to wear sunglasses to protect your eyes from the sun and use a hat or umbrella to provide shade when walking outdoors.

Pro Tip: Seek out air-conditioned spaces, such as museums or shopping centers, during the hottest parts of the day to find relief from the sweltering heat.

For more information on dressing for warm weather in Chicago, you can visit Choose Chicago, the official tourism website for the city. They provide valuable insights and tips on how to make the most of the warm months while staying stylish and comfortable.

Fun Warm Weather Activities

When the warm weather finally arrives in Chicago, residents and visitors alike are eager to get outside and enjoy all that the city has to offer. From outdoor concerts to beach days along Lake Michigan, there are plenty of fun activities to partake in during the warmer months.

Here are some of the top warm weather activities to enjoy in Chicago:

Outdoor Concerts, Shows, and Festivals

Chicago comes alive with music and entertainment during the summer months. From free outdoor concerts in Millennium Park to large-scale music festivals like Lollapalooza, there is something for everyone’s musical taste.

The city also hosts a variety of outdoor theater performances and shows, where you can enjoy a play or musical under the stars. With so many options to choose from, you’ll never be bored when it comes to outdoor entertainment in Chicago.

Beach Days Along Lake Michigan

Chicago is fortunate to have a beautiful coastline along Lake Michigan, and when the weather warms up, the beaches become a popular destination. Whether you’re looking to relax on the sand, take a dip in the refreshing water, or play a game of beach volleyball, there are several beaches to choose from, including North Avenue Beach and Oak Street Beach.

Pack a picnic, bring a good book, and soak up the sun while enjoying the stunning views of the lake.

Boating, Kayaking, and More

For those who enjoy being out on the water, Chicago offers various opportunities for boating and water activities. You can rent a kayak or paddleboard and explore the Chicago River or venture out onto Lake Michigan for a day of sailing or jet skiing.

If you’re feeling adventurous, consider taking a boat tour of the city’s architecture or participating in a sunset cruise. With the city’s picturesque skyline as your backdrop, these water activities are sure to provide a memorable experience.

So, when does it get warm in Chicago? While the exact timing may vary from year to year, typically the warm weather starts to make its appearance in late spring, with temperatures rising into the 70s and 80s Fahrenheit (20s and 30s Celsius).

By summer, Chicago experiences its peak warmth, with temperatures often reaching the 90s Fahrenheit (30s Celsius). It’s during this time that the city truly comes alive with outdoor activities and a vibrant energy that is hard to resist.

For more information on upcoming events and activities in Chicago, visit https://www.choosechicago.com/events-and-shows/.


After a long Chicago winter, the warm season beginning in May is welcomed with open arms. While spring brings some temperature swings, by summertime, residents take full advantage of long sunny days and time outdoors. Before you know it, the chill creeps back in fall, making those warm months all the more precious.

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