September 18 - 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 September 18 in WAUKEGAN HARBOR the average high temperature is 71.5 °F (21.9 °C). The lowest recored high temperature was 62.1 °F (16.7 °C) in 2012 and the highest recored high temperature was 81.7 °F (27.6 °C) in 2007. The high temperature is usually^* between 67.0 °F (19.4 °C) and 76.0 °F (24.5 °C). About a quarter of the time, the high temperature is less than 67.0 °F (19.4 °C), and another quarter of the time, the high temperature is greater than and 76.0 °F (24.5 °C). About 95% of the time, the high temperature has been between 58.4 °F (14.7 °C) and 84.6 °F (29.2 °C).

Low Temperatures

On September 18 in WAUKEGAN HARBOR the average low temperature is 60.5 °F (15.8 °C). The lowest recored low temperature was 47.7 °F (8.7 °C) in 2012 and the lowest recored low temperature was 70.3 °F (21.3 °C) in 2022. The low temperature is usually^* between 56.7 °F (13.7 °C) and 64.3 °F (18.0 °C). About a quarter of the time, the low temperature is less than 56.7 °F (13.7 °C), and another quarter of the time, the low temperature is greater than and 64.3 °F (18.0 °C). About 95% of the time, the low temperature has been between 49.4 °F (9.7 °C) and 71.6 °F (22.0 °C).

Frost

On September 18 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 2023

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