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NewsChicago Sun-TimesJuly 1, 2026United States

Extreme Heat Alert Extended for Cook County Through Friday

Officials have extended an extreme heat alert for Cook County until Friday morning as temperatures are expected to remain in the 90s. Residents are advised to stay hydrated and seek air-conditioned spaces to avoid heat-related illnesses.

public safetyweatherinfrastructurepublic health
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Why It Matters

Residents face prolonged exposure to high temperatures and heat indices up to 105 degrees, which increases the risk of heat-related health issues and potential power grid strain.

Key Facts

  • An extreme heat alert for Cook County is in effect until 12 a.m. on Friday, June 30, 2026.
  • Temperatures are forecast to remain in the 90s throughout the week.
  • Heat index values may reach up to 105 degrees.
  • Forecasted daily maximum temperatures: 97 degrees (Wednesday), 96 degrees (Thursday), and 92 degrees (Friday).
  • ComEd reported approximately 1,400 customers without power as of 6 p.m. Tuesday.
  • ComEd considers power outages exceeding 100,000 customers to be a major disruption.
  • Extreme heat is a suspected factor in some power outages due to transformer overheating.
  • The record high for June 30 is 99 degrees, set in 1953.

Who's Mentioned

organizationComEd“Utility provider reporting on power outages”locationCook County“Area under extreme heat alert”organizationOffice of Emergency Management and Communications“Provided safety guidance and alert duration”organizationNational Weather Service“Issued the extreme heat alert”personAnthony Garcia“Spokesperson for ComEd”