Southern California Experiences Record-Breaking Humidity Levels
Southern California Experiences Record-Breaking Humidity Levels
US · Published Sep 14, 2026
Southern California is experiencing unprecedented humidity levels, marking the most humid summer in the past 46 years, according to climate scientist Daniel Swain. Data from airports in Santa Barbara, Los Angeles, Long Beach, and San Diego indicate record-high average dew points since
On September 8, 2026, coastal cities like Long Beach, Huntington Beach, and Newport Beach recorded dew points of 76°F (24.4°C), comparable to typically humid cities like New Orleans and Orlando. This unusual moisture is attributed to a combination of monsoonal moisture and remnants of Hurricane Marie, along with an extraordinary marine heat wave along the California coastline. Sea temperatures near Ensenada, Baja California, are reported to be 10°F (5.6°C) above average, with waters off Los Angeles reaching record highs. The National Oceanic and Atmospheric Administration (NOAA) has also noted a significant rise in sea levels, which could exacerbate coastal flooding and erosion during the upcoming El Niño winter.

Impact & Risks

The high humidity levels are amplifying the heat's impact, making it more dangerous for residents, particularly in areas like Central and South Central Los Angeles, where many homes lack air conditioning. Moist heat is harder for the human body to tolerate, increasing the risk of heat-related illnesses such as heat exhaustion and heat stroke. Vulnerable populations, including older adults, young children, outdoor workers, and individuals with chronic health conditions, are at heightened risk. Additionally, the elevated sea levels, combined with high tides and large waves, have already caused significant coastal flooding and beach erosion. The National Weather Service has issued warnings for major beach erosion, shallow seawater flooding, and dangerous rip currents along south-facing shores through September 10, 2026.

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