During the Labor Day weekend and beyond, Fresno, Merced and Hanford saw record-breaking heat, setting new records for high maximum temperatures.
On Tuesday, Fresno set a new record for September with a high of 114 - the city's hottest September day in recorded history.
This comes right after the Valley moved out of an unusually hot August.
ABC30 Chief Meteorologist Kevin Musso says while the heat wave will remain over the next few days, the chances of a Sierra storm will return and stay through the weekend, bringing cooler temperatures.
VIDEO: Staying safe in extreme heat
The risk of heat-related illness is always a concern when temperatures are predicted to be this high.
Here are some tips from health officials to get through the heat wave:
Headache, nausea and dizziness are all symptoms of heat exhaustion.
Staying hydrated in the most severe cases could mean the difference between life and death.
Health experts say if you or someone you know is experiencing heat exhaustion and drinking water and cooling off still aren't helping, it could be time to call 911.