Why this summer's L.A. heat waves feel so miserable: Hotter nights, broiling beaches

Key Points:

• Southern California’s summer heat feels unusually oppressive due to persistently high nighttime temperatures and warmer coastal conditions, despite daytime temperatures being relatively typical.
• Climate scientist Daniel Swain highlights record-breaking warm nights driven by elevated ocean temperatures and increased humidity, with dew points near coastal areas reaching Miami-like levels.
• The ongoing heat wave is expected to intensify this week, with potential record-high daytime temperatures in major cities like Los Angeles and Long Beach, exacerbated by climate change and the influence of El Niño.
• Elevated nighttime heat increases health risks by preventing the body from cooling down, while also stressing infrastructure, plants, and animals; power outages during heat waves further compound discomfort and safety concerns.
• Residents report increased reliance on air conditioning and difficulty sleeping, with some seeking cooler locations during power outages, illustrating the human impact of prolonged heat and humidity.