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Typical weather in Chicago, IL (Illinois), USA on May 15

High Temperatures

On May 15 in Chicago, IL (Illinois), USA the average high temperature is 70.1 °F (21.2 °C). The lowest recored high temperature was 43.0 °F (6.1 °C) in 1945 and the highest recored high temperature was 95.0 °F (35.0 °C) in 2025. The high temperature is usually* between 62.7 °F (17.1 °C) and 77.5 °F (25.3 °C). About a quarter of the time, the high temperature is less than 62.7 °F (17.1 °C), and another quarter of the time, the high temperature is greater than and 77.5 °F (25.3 °C). About 95% of the time, the high temperature has been between 48.6 °F (9.2 °C) and 91.6 °F (33.1 °C).

Low Temperatures

On May 15 in Chicago, IL (Illinois), USA the average low temperature is 50.4 °F (10.2 °C). The lowest recored low temperature was 35.1 °F (1.7 °C) in 2016 and the lowest recored low temperature was 72.0 °F (22.2 °C) in 1962. The low temperature is usually* between 45.3 °F (7.4 °C) and 55.5 °F (13.1 °C). About a quarter of the time, the low temperature is less than 45.3 °F (7.4 °C), and another quarter of the time, the low temperature is greater than and 55.5 °F (13.1 °C). About 95% of the time, the low temperature has been between 35.6 °F (2.0 °C) and 65.3 °F (18.5 °C).

Frost

On May 15 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 0.7% of the time.

Data Source(s)

The data used to compute the average high/low temperatures for this location were taken from the following stations: