The temperatures across Canyon Country climbed above normal Sunday. The sun's rays coupled with high humidity covered much of the region in sweltering heat.
In the Antelope Valley, triple digit temperatures pushed 120 degrees as residents did everything they could to find some relief and keep cool.
Despite the heat, thousands of die-hard runners hit the streets for the fifth annual Pasadena Marathon on Sunday.
The race kicked off at Pasadena City College with a half-marathon at 6:30 a.m. The half-marathon was followed by a 5K and a 10K. Many participants ran more than 13 miles.
Temperatures were expected to near the triple digits by the race's end, so organizers set up extra water stations and had extra ice towels on hand for runners. The heat came in striking comparison to last year's marathon, which was rained on.
Despite those efforts, at least 15 people needed medical attention due to dehydration from the heat. Six runners were transported because they suffered significant heat-related effects, according to Lisa Derderian with the Pasadena Fire Department.
To prepare for the heat, many runners say they trained during the afternoon hours and carried water bottles on them during the marathon.
Pasadena residents were also on-hand to help keep the runners cool.
"I have to say thank you to all the residents of Pasadena that came out with their hoses, because that really helped us stay cool," said Pilar Trincado of La Palma.
Relief from the heat is not expected until about Tuesday. Monday's temperatures are forecast to be similarly searing, but should drop dramatically by the end of the week.
Until then, temperatures will hover in the upper 90s to triple-digits for most of Southern California, with excessive heat watches expiring 9 p.m. Sunday.
Health officials warn residents to minimize time spent outdoors and not to leave children or pets in unattended cars. If you are going to brave the hot temperatures make sure to drink plenty of water, stay in the shade and wear a hat.