DC Reaches Average of 40 Days Above 90°F, More Heat Expected
• Washington, D.C. has reached its seasonal average of 40 days with temperatures at or above 90°F (32.2°C) as of August 10, 2026, according to the National Weather Service (Capital Weather). This milestone comes during the city’s sixth heat wave of the year, with the average last 90°F day typically occurring in mid-September. The record for the most 90°F days by this point in the season is 50, set in 2010, which also holds the record for the most 90°F days in a year at
• Last year, D.C. experienced 36 such days. With about a month of summer heat remaining and an El Niño pattern contributing to global warmth, the city is on track to exceed 50 days of 90°F or higher, potentially placing 2026 among the top 20 hottest years on record.
Impact & Risks
The ongoing heat wave poses risks to vulnerable populations, including the elderly, children, and those with pre-existing health conditions. Prolonged exposure to high temperatures can lead to heat-related illnesses such as heat exhaustion and heatstroke. Additionally, the increased demand for cooling may strain energy resources, potentially leading to power outages. Outdoor workers and individuals without access to air conditioning are particularly at risk. The heat also exacerbates air quality issues, which can affect individuals with respiratory conditions.
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