Overview
- A strong high-pressure ridge is building over much of the U.S., lifting inland highs into the 80s this week with many locations reaching upper-80s and isolated 90°F readings by Thursday and Friday.
- Humidity will stay low through midweek then climb Friday, with dew points peaking around Saturday and making the warm air feel noticeably stickier ahead of the weekend front.
- A frontal boundary approaching late Thursday into the weekend will bring scattered showers and thunderstorms Saturday into Sunday with the Storm Prediction Center outlining a marginal (Level 1) severe risk for isolated hail and gusty winds.
- Coastal and lakefront areas will stay significantly cooler from sea and lake breezes while inland spots heat fastest, and the Southwest — including the Las Vegas area — is forecast to see an extreme heat pulse with highs near 104–106°F that raises heat‑health and infrastructure stress.
- Forecast timing and storm placement remain uncertain so localized outcomes could change with newer model runs and residents should plan for warm, dry weekdays and monitor updates for weekend storm timing or worsening heat in the Southwest.