Triple-digit temperatures are forecast to slam the San Joaquin Valley Monday afternoon. Fresno, Bakersfield, and Merced are all at risk of record highs — and the heat isn’t letting up overnight.
Heat Illness Risk: Moderate to Major
Vulnerable groups — elderly residents, outdoor workers, and those without air conditioning — face elevated risk through Tuesday evening, May 12. Afternoon peak: 3 p.m. – 6 p.m.
Record Probabilities Today, May 11
| Fresno 100°F+ Record: 100°F 82% chance of tying or breaking record | Bakersfield 103°F 16% record high chance 34% chance of record warm low (69°F) | Merced 99°F+ Record: 99°F 60% chance of tying or breaking record | Hanford Triple digits 36% record chance Tue Agricultural operations at high risk |
Why overnight cooling won’t save you
One of the most dangerous aspects of this heat event is that temperatures won’t drop enough overnight — especially in urban areas. That means your home, car, and surrounding streets will stay warm going into Tuesday, when Bakersfield climbs toward 103°F again and Fresno could near 102°F. Cumulative heat stress builds when the body can’t recover overnight.
Peak Danger Window: 3 p.m. – 6 p.m. both days
Agricultural workers along Highway 99 and across Kern, Fresno, and Merced counties face the highest exposure. Outdoor labor during peak hours Monday and Tuesday carries serious heat illness risk.
What to do right now
| Hydrate constantly Drink water before you feel thirsty. Avoid alcohol and caffeine during peak hours. | Stay indoors 3–6 p.m. The hottest hours are 3 to 6 p.m. both Monday and Tuesday. Limit all outdoor activity. | Check on neighbors Elderly residents and those without AC are most at risk. Check in — it can save a life. | Never leave kids in cars Car interiors can exceed 140°F on days like this. Even a quick errand is too long. |
When does it ease?
Temperatures will ease slightly by midweek but are expected to remain above seasonal averages through the rest of the week. There is no significant cool-down on the immediate horizon for the San Joaquin Valley.
