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California heat advisory
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The gist
National Weather Service issued heat advisory for Northern California Wednesday 10 a.m. to Thursday 10 p.m.
Vulnerable groups face health risks; residents urged to stay hydrated and cool.
Background
A heat wave is affecting California, with advisories and warnings in place across the state. The National Weather Service issued a heat advisory for Northern California, effective from Wednesday morning through Thursday night, due to a ridge of high pressure strengthened by residual tropical moisture from Hurricane Marie. Temperatures are expected to be significantly above normal, increasing the risk of heat-related illnesses.
How it unfolded
- Sep 7, 2026Meteorologists project a major heat event for Northern California, with a moderate to major risk of heat-related illness.
- Sep 8, 2026NWS Sacramento issues an updated heat advisory valid from Wednesday 10 a.m. until Thursday 10 p.m. for multiple counties.
- Sep 8, 2026Heat advisories and extreme heat warnings are in effect across Southern California, including San Diego County, with temperatures up to 10-15 degrees above average.
Who’s saying what
- Official
- National Weather Service urges residents to drink plenty of fluids, stay in air-conditioned rooms, and avoid direct sun exposure.
- Public
- San Francisco officials remind residents to use public cooling centers and check on vulnerable neighbors.