July 31 - WAUKEGAN HARBOR - Weather History and Averages

Station: WAUKEGAN HARBOR (2006 to 2025)
Country: US
State: IL
Latitude: 42.35
Longitude: -87.82

High Temperatures

On July 31 in WAUKEGAN HARBOR the average high temperature is 77.9 °F (25.5 °C). The lowest recored high temperature was 70.2 °F (21.2 °C) in 2025 and the highest recored high temperature was 85.5 °F (29.7 °C) in 2008. The high temperature is usually^* between 74.9 °F (23.8 °C) and 80.9 °F (27.1 °C). About a quarter of the time, the high temperature is less than 74.9 °F (23.8 °C), and another quarter of the time, the high temperature is greater than and 80.9 °F (27.1 °C). About 95% of the time, the high temperature has been between 69.3 °F (20.7 °C) and 86.5 °F (30.3 °C).

Low Temperatures

On July 31 in WAUKEGAN HARBOR the average low temperature is 67.7 °F (19.8 °C). The lowest recored low temperature was 60.8 °F (16.0 °C) in 2009 and the lowest recored low temperature was 73.2 °F (22.9 °C) in 2007. The low temperature is usually^* between 65.3 °F (18.5 °C) and 70.2 °F (21.2 °C). About a quarter of the time, the low temperature is less than 65.3 °F (18.5 °C), and another quarter of the time, the low temperature is greater than and 70.2 °F (21.2 °C). About 95% of the time, the low temperature has been between 60.6 °F (15.9 °C) and 74.9 °F (23.8 °C).

Frost

On July 31 in WAUKEGAN HARBOR expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.

^{Usually* in this context means around 50% of the
time, assuming a normal distribution of values.}

Data Source(s)

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

WAUKEGAN HARBOR — Integrated Surface Dataset (ISD) station ID: 997735 — from year 2007 to 2025

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