What to know as another heat wave hits San Antonio

It's dangerously hot outside. And the heat isn't going away anytime soon.

Driving the news: San Antonio remains under an excessive heat warning until at least 9pm Thursday, per the National Weather Service.

• Highs are forecast between 102° and 103° through Tuesday, and it will feel even hotter.

Why it matters: The long duration of this heat wave increases public health dangers, Axios' Andrew Freedman reports.

Context: Hot days aren't unusual in Texas, but they fit into a larger global trend of heat records set this summer.

• Scientists are already warning that 2023 could be the hottest year on record.

The big picture: Cities in the Southwest that are synonymous with heat are poised to break daily, monthly and potentially even all-time high temperature records, as well as set milestones for the longest streak of exceptionally hot days.

By the numbers: The San Antonio Fire Department responded to 95 calls for heat-related medical emergencies between July 1 and Wednesday morning, spokesperson Joe Arrington tells Axios.

• That's down from 121 calls in the same period last year.

Yes, but: Calls were up last month. There were 297 calls for heat-related medical emergencies in June, up from 180 calls in June 2022, Arrington says.

Threat level: Heat waves are a quiet killer, with deaths often not tallied until well after the extreme weather event has subsided.

Of note: The state's power grid operator, the Electric Reliability Council of Texas, hasn't asked Texans to conserve energy.

• There was enough energy to meet demand as of Wednesday afternoon.

Zoom out: Last month was the world's hottest June on record, surpassing the last global record in June 2019, per CNN.

• The nine hottest Junes have occurred in the last nine years.

What's next: You should avoid going outside during the hottest parts of the day, and hydrate.

• The city has public buildings where you can stay cool inside, and tips to beat the heat.