Southern California has recorded its most humid days in modern history, with dew points reaching levels typically found in tropical rainforests, according to weather experts. On Thursday, August 28, 2026, the average dew point in Los Angeles hovered around 70 degrees Fahrenheit (21 degrees Celsius), with some areas experiencing even higher levels.
Meteorologist Ben Noll reported that Los Angeles' dew point reached as high as 73 degrees Fahrenheit, while the Salton Sea area saw a dew point of 81 degrees Fahrenheit. Noll described these conditions as "comparable to the Amazon rainforest and quite possibly its highest value on record" for the region. These unusually sticky conditions are attributed to a combination of factors, including an exceptionally warm Pacific Ocean, which is increasing evaporation, and a severe marine heat wave near the coast.
Further contributing to the humidity is a "heat dome" over the Southwestern United States, an area of high pressure that is trapping moisture. Atmospheric winds are drawing tropical air from Mexico into the Los Angeles area, according to Ryan Kittell, a meteorologist with the National Weather Service. Data from weather analyst Colin McCarthy indicates that August 28th was one of the most humid days on record for Los Angeles, with conditions nearing those seen on two days in September 2022.
The intense heat and humidity have prompted an extreme heat warning from the National Weather Service, in effect until 8 p.m. Friday. Temperatures are projected to reach up to 102 degrees Fahrenheit, posing a "high risk for dangerous heat illness," particularly for vulnerable populations such as young children, the elderly, those without air conditioning, and individuals engaged in outdoor activities.
In response to the extreme weather, Los Angeles Mayor Karen Bass announced that numerous city facilities, including libraries and recreation centers, would be made available as cooling centers for residents seeking relief. The prolonged period of high temperatures and humidity has residents noticing the difference. "I grew up in Virginia, which is way more humid than here, and I actually do think it has felt a little more humid this summer," said Lindsay Lazarus, 41, a resident of Los Angeles.
