Weather in Chicago

Stay up to date with the current weather in Chicago. Below you will find the latest data, forecasts, and useful charts to plan your stay.

The climate of Chicago is characterised as continental, with four clearly defined seasons. The city is known for significant temperature fluctuations throughout the year, making each season attractive in its own way and requiring travellers to prepare their wardrobe accordingly.

Winters in Chicago are generally cold: average temperatures in January (around -2.3°C) and February (around -1.1°C) drop below freezing, and snowfall is not uncommon. Spring brings gradual warming, from an average of +3.8°C in March to +14.6°C in May, although the weather can be changeable. Summer is warm and sunny, especially in July and August, when average temperatures are +23.2°C and +22.9°C respectively, creating comfortable conditions for walking and outdoor activities. In autumn, the weather becomes cooler, transitioning from a pleasant +20.2°C in September to +5.8°C in November, delighting visitors with colourful landscapes and preparing the city for winter.

Regarding precipitation, the provided data indicates a small total amount in millimetres (2-4 mm) each month. However, it is important to note that the number of days with precipitation ("wet days") remains fairly stable throughout the year, ranging from 9 to 13 days per month. This suggests that while precipitation is not heavy in volume, it falls regularly, without a distinctly dry or rainy season. Therefore, when planning a trip, it is worth being prepared for changeable weather in any season.

The climate of Chicago demonstrates significant temperature fluctuations throughout the year, which is important to consider when planning a trip. The coldest months are traditionally January, with an average temperature of around -2.3°C (minimum values can drop to -5.0°C, and maximums barely reach 0.4°C), and February, where the average temperature is -1.1°C (with nightly lows around -4.4°C and daily highs up to 2.2°C). Conversely, the peak of warmth occurs in July, when the average temperature reaches +23.2°C (around +19.9°C at night, up to +26.5°C during the day), and August with similar figures: average +22.9°C (minimum +19.7°C, maximum +26.2°C).

The summer months in Chicago, from June to August, are characterised by pleasant warm weather, which can become hot at times. Daytime temperatures usually range from +24°C to +26.5°C, creating comfortable conditions for walking and exploring the city. Nights bring refreshing coolness, with temperatures dropping to +17°C - +20°C; thus, the daily temperature variation in summer can be around 6-7°C. The winter period, especially from December to February, brings real frosts to the city. Average daytime temperatures often hover around zero or slightly above, such as in December (maximum +4.1°C), but in January and February, they may not rise above +0.4°C - +2.2°C. Night frosts are a common occurrence, and the thermometer regularly drops to -4°C, and in January down to -5.0°C. In winter, daily fluctuations are also noticeable, amounting to about 5-6°C, which requires warm winter clothing capable of adapting to temperature changes throughout the day.

In Chicago, precipitation is distributed quite evenly throughout the year, and there is no clearly defined rainy season or dry period, judging by the total volume of moisture. A small amount of precipitation is recorded monthly, varying from 2 to 4 mm. Winter months, such as January and February, are characterised by negative average temperatures, so precipitation at this time often falls as snow. In the warm season, it is predominantly rain.

Regarding the "wettest" periods, the highest amount of precipitation (4 mm each) usually falls in April, May, June, and October. Furthermore, April, May, and October also stand out with the highest number of days with precipitation – an average of 13 days in each of these months. The "driest" months by volume of precipitation (2 mm) are considered to be February, August, November, and December. The fewest number of days with precipitation, around 9, is observed in November.

The frequency of precipitation in Chicago remains relatively stable throughout the year, fluctuating in the range of 9 to 13 "wet" days monthly. This means that, despite small volumes, light precipitation can occur regularly. In winter, this is usually snow or light drizzle. In spring and autumn, one can expect both rain and short periods of sleet, especially in early spring or late autumn. In summer, precipitation is predominantly rain, which can be either short showers or more prolonged, but usually not too heavy.

When planning a trip to Chicago, it is important to choose your wardrobe correctly, taking into account the changeable weather and distinct seasons. The key principle is layering. This will allow you to feel comfortable both outdoors and indoors, as well as easily adapt to temperature changes during the day. Regardless of the time of year, comfortable walking shoes are mandatory, as Chicago is a city that invites long walks. Also, do not forget an umbrella or a light waterproof jacket, as light precipitation is possible in any month.

In winter (from December to February), when the temperature often drops below zero and snowfall is possible, you will need a warm winter jacket or down coat, hat, scarf, gloves, and insulated waterproof shoes. In spring (from March to May), the weather can be unpredictable: from cool to moderately warm. Take a medium-weight jacket, sweaters, jeans, or thick trousers with you. In summer (from June to August), it is usually warm and sunny, so light clothing made of natural fabrics, shorts, and t-shirts will be suitable. However, do not forget a light cardigan or windbreaker for evening walks or visiting air-conditioned premises, as well as sunscreen and a hat. In autumn (from September to November), the weather gradually becomes cooler. You will find jumpers, a light jacket (in September-October), or a warmer coat (closer to November), as well as a scarf, useful.

Considering that Chicago is known as the "Windy City", windproof clothing will be relevant at almost any time of the year. Even on warm days, the wind from Lake Michigan can be quite noticeable. Therefore, a light windbreaker or jacket that can be worn over other clothes will become your reliable companion. Also, due to regular, albeit not heavy, precipitation throughout the year, it is always worth keeping a compact umbrella or raincoat at hand.