What's the weather like in Chicago in May?Often known as the ‘Windy City’, Chicago is in the state of Illinois alongside the waters of Lake Michigan. In May the city is more summery as temperatures rise and the sun shines through the clouds, although it can be showery at this time of year as well. If you want to explore Chicago in warm but not overly hot conditions, May is a great month to visit this popular, vibrant city in the Midwest.
AveragesIn May, the average temperature in Chicago is 15°C, with highs of 21°C bringing warm weather ideal for sightseeing in the city. At night the temperature falls to around 9°C, so although it can be t-shirt weather in the daytime, you’ll need warm layers for evenings out. With an average of nine hours sunlight each day, you’ll see clear blue skies quite often in May, although with 90mm of rain expected over the course of the month, wet spells are common.