Weather Alerts For San Marino, CA

# HEADLINE -------------------- EXTREME HEAT WATCH REMAINS IN EFFECT FROM TUESDAY MORNING THROUGH THURSDAY EVENING # DETAILS -------------------- WHAT Dangerously hot conditions with temperatures up to 100 possible. Hottest Wednesday and Thursday. WHERE San Fernando Valley, San Gabriel Mountains, San Gabriel Valley, Santa Clarita Valley. WHEN From Tuesday morning through Thursday evening. IMPACTS There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors. ISSUED AT Friday, June 19, 2026 at 8:08 PM PDT ISSUED BY National Weather Service Los Angeles/Oxnard CA HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. # AREAS AFFECTED -------------------- Eastern San Fernando Valley, Eastern San Gabriel Mountains, Los Angeles County San Gabriel Valley, Santa Clarita Valley, Western San Fernando Valley, Western San Gabriel Mountains and Highway 14 Corridor Including the cities of Pasadena, Wrightwood, Valencia, Northridge, Santa Clarita, La Canada Flintridge, Burbank, Warm Springs, Mount Wilson, Mount Baldy, East Los Angeles, El Monte, San Gabriel, Mill Creek, Woodland Hills, Chatsworth, Glendale, Acton, Lake Castaic, Pomona, The Angeles Crest Highway, Newhall, Sunland, Van Nuys, and Universal City

# HEADLINE -------------------- AIR QUALITY ALERT DUE TO HARMFUL FINE PARTICLE POLLUTION LEVELS # DETAILS -------------------- WHAT The South Coast AQMD has extended an air quality alert due to harmful levels of fine particle pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. WHERE Pasadena, San Gabriel and Pomona. Levels of particle pollution can vary by time and location depending on emissions and local weather conditions. WHEN until 1:00 PM Saturday. IMPACTS Particle pollution can get deep into the lungs and cause serious health problems such as heart attacks, bronchitis, asthma attacks, and difficulty breathing. Everyone can be affected, but sensitive groups such as people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. ISSUED AT Friday, June 19, 2026 at 3:26 PM PDT ISSUED BY Relayed by National Weather Service Los Angeles/Oxnard CA HEADER Air Quality Alert Message # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- To protect your health, check air quality levels and act as needed: - When Air Quality Index (AQI) levels are "Unhealthy for Sensitive Groups" (orange), sensitive groups as specified above should limit extended or intense outdoor activity. - When AQI is "Unhealthy" (red), everyone may experience health impacts. Sensitive groups should avoid extended time outdoors. - When AQI is "Very Unhealthy" (purple), sensitive groups should avoid all outdoor physical activity. Everyone else should avoid extended or intense outdoor activity. - When AQI is "Hazardous" (maroon), everyone should avoid all outdoor physical activity. - ADDITIONAL DETAILS... To help keep indoor air clean when air quality is poor: - Keep windows and doors closed - Run your air conditioner and/or an air purifier - Do not use whole house fans or swamp coolers that bring in outside air if you have other methods to stay cool - Avoid other sources of pollution such as fireplaces, candles, incense, grilling, and gasoline-powered lawn and garden equipment # AREAS AFFECTED -------------------- Los Angeles County San Gabriel Valley Including the cities of East Los Angeles, El Monte, Pasadena, Pomona, and San Gabriel