Island Lake, Illinois — City Overview

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Living in Island Lake, summers are warm, peaking at 83.1°F in Jul, while winters are cold — Feb lows average 16.5°F. At 6067 heating degree days per year, winter energy bills are significant. With 39.5 inches annually, the climate is relatively dry. Median household income: $91,852. With a 9.0% poverty rate and 81.0% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 43 over the past week.

View Island Lake city guide

Updated October 16, 2026.

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