During periods of extreme heat, the City of Boston may declare a heat advisory or emergency and open cooling centers or extend pool hours. The City asks that you check on your neighbors, especially the elderly to ensure they are okay. You can call the Mayor's Hotline or review our heat resources for additional up-to-date information.
Mayor's Hotline (617-635-4500)
Heat Wave: Prolonged period of excessive heat, often combined with excessive humidity.
Excessive Heat Watch: Conditions are favorable for an excessive heat event to meet or exceed local Excessive Heat Warning criteria in the next 24 to 72 hours.
Excessive Heat Warning: Heat Index values are forecast to meet or exceed locally defined warning criteria for at least 2 days (daytime highs=105-110° Fahrenheit).
Heat Advisory: Heat Index values are forecast to meet locally defined advisory criteria for 1 to 2 days (daytime highs=100-105° Fahrenheit).
Family Preparedness Planner