Heat Advisory Continues for Marble Falls and the Highland Lakes

Residents of Marble Falls and communities throughout the Highland Lakes are facing another weekend of potentially dangerous summer heat.

As verified on Saturday, August 22, 2026, the National Weather Service has a Heat Advisory in effect for Burnet and Llano counties through 7 PM Sunday, August 23. The NWS Austin/San Antonio office is forecasting afternoon high temperatures around 100–105°F, with humidity pushing heat index values into dangerous territory.

The advisory includes the northern Hill Country, including Burnet and Llano counties. Anyone planning yard work, home projects, recreation or other outdoor activities this weekend should take the heat into account before heading outside.

The National Weather Service recommends several straightforward precautions during periods of dangerous heat.

Drink plenty of fluids throughout the day and spend as much time as practical in an air-conditioned environment. When outside, lightweight, loose-fitting clothing can help, and strenuous activities are better scheduled for the early morning or evening rather than during the hottest part of the afternoon.

Frequent breaks are also important for people working outside. Look for a shaded or air-conditioned location where you can get out of the heat periodically.

The NWS also recommends checking on relatives and neighbors during periods of extreme heat, particularly people who may have difficulty keeping their homes cool.

Children and pets should never be left unattended in a parked vehicle, even for a short period.

For homeowners, this is also a good weekend to think about outdoor chores strategically. Mowing, landscaping, cleaning up around the property and other physically demanding projects don’t necessarily have to happen during peak afternoon temperatures. Moving those jobs to earlier in the morning or postponing them until conditions improve can reduce unnecessary exposure to the hottest part of the day.

Extended periods of high temperatures generally mean household air-conditioning systems have to operate for longer periods to maintain indoor temperatures.

That doesn’t mean an air conditioner is necessarily at risk of failing simply because the weather is hot. It does mean that homeowners may notice their systems running more frequently or for longer cycles during the hottest part of the afternoon.

Simple steps around the house can help reduce unnecessary cooling demand. Keeping exterior doors and windows closed while the air conditioning is operating, closing blinds or curtains where direct sunlight is heating rooms, and avoiding unnecessary heat-generating activities during the hottest part of the afternoon can all help keep indoor spaces more comfortable.

Most importantly, homeowners should treat this weekend’s heat as a reason to plan ahead rather than panic.

The current Heat Advisory is scheduled to remain in effect until 7 PM Sunday, August 23, but forecasts and weather advisories can be updated as conditions develop.

Before outdoor activities or travel around Marble Falls, Burnet, Llano and the Highland Lakes, check the National Weather Service Austin/San Antonio forecast and current advisories for the latest information.

This article reflects National Weather Service information verified on August 22, 2026. Weather conditions, temperatures and advisory times can change after publication.