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Heat Advisory

◍ Santa Ana Mountains and Foothills · USA · updated 9/9/2026, 9:58:00 AM

⏱ In effect until 3:30 PM UTC-7

Severity score

65/100

Confidence

High

Why this matters

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the 90s to near 100 with low temperatures in the 70s expected. For the Heat Advisory, high temperatures in the mid 80s to mid 90s expected. * WHERE...Santa Ana Mountains and Foothills. * WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM

Key stats

Severity

Moderate

Certainty

Likely

Urgency

Expected

Timeline

Heat Advisory
9/9/2026, 9:58:00 AM
Heat Advisory issued September 9 at 2:58AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA

Sources & attribution

OfficialNWS NWS San Diego CAupdated 9/9/2026, 9:58:00 AM

OfficialNWS NWS Kansas City/Pleasant Hill MOupdated 9/9/2026, 8:43:00 AM

OfficialNWS NWS Springfield MOupdated 9/9/2026, 8:11:00 AM

OfficialNWS NWS St Louis MOupdated 9/9/2026, 7:40:00 AM

OfficialNWS NWS Fort Worth TXupdated 9/9/2026, 4:31:00 AM

⚠This is an informational severity score, not an official warning. Follow guidance from NWS/NOAA, FEMA (ready.gov), and local emergency management.