A dangerous stretch of late-summer heat is taking hold across Central California this week, prompting warnings from forecasters and state emergency officials. The National Weather Service (NWS) office in Hanford reports that temperatures are expected to climb into the upper 90s Tuesday and Wednesday, with some communities likely hitting or exceeding 100 degrees.
The heat wave is being driven by a high-pressure system building over the state, trapping hot air over the San Joaquin Valley. Forecasters say the setup will push heat risk into the moderate to major category, meaning conditions could become hazardous for outdoor workers, children, seniors, and those without access to reliable cooling.
Major population centers including Fresno, Bakersfield, Visalia, and Merced are expected to experience the brunt of the heat. Compounding the risk is a lack of significant overnight cooling in some locations, leaving little relief during the late evening and early morning hours. Warm nights can worsen heat-related illness because the body has less time to recover from daytime highs.
Officials caution that extended exposure to these temperatures—especially during the hottest parts of the day—can quickly lead to dehydration, heat exhaustion, or even heat stroke. The California Office of Emergency Services is advising residents to limit strenuous activity, stay hydrated, and check on elderly neighbors or relatives. Those without air conditioning are encouraged to seek out cooling centers or public buildings during peak afternoon heat.
Outdoor workers and agricultural laborers, who make up a significant part of the Central Valley workforce, are urged to take frequent breaks, use shaded rest areas, and keep plenty of water on hand. Employers are reminded that California law requires providing heat illness prevention measures for outdoor crews during excessive heat events.
The NWS says the heat is expected to peak Wednesday before easing slightly later in the week. Still, warm conditions will persist, and additional advisories may be issued if temperatures linger near triple digits longer than expected.
Warnings remain in effect through at least Wednesday for much of the Central Valley, with the most severe heat risk centered around Fresno and surrounding counties. Residents are encouraged to remain weather-aware and take extra precautions until the heat wave subsides.
