SAN DIEGO – High pressure over the county should bring a toasty weekend inland and warm weather to the coast.

The inland valleys should be in the 90s, the mountains could approach 100, and the deserts are expected to see highs of 110, according to National Weather Service forecaster Noel Isla.

The weather service is warning people to avoid physical exertion during the hottest part of the day, wear loose fitting, light-weight clothing and take advantage of shade and air conditioning, if available.

“If people want to do some outdoor activity, as usual, hydration is the key,” Isla said.

Despite the hot weather in the mountains, Isla said the fire risk is not high. Humidity levels are not expected to be dangerously low and strong winds are not forecast.

The coast might be the place to go to escape the heat, although it should still be a few degrees above normal Friday and Saturday. Highs at the beaches are expected to range from the low to mid 80s.

A cooling trend is expected to begin Sunday. Highs at the beaches should drop to the upper 70s to low 80s, and the inland valleys should drop to the high 80s. By Wednesday of next week, all areas of the county are expected to be a few degrees cooler than normal, with the beaches in the mid 70s and the inland valleys in the low 80s.

Isla said there is a slight chance of thunderstorms in the mountains and deserts Friday. Remnants of tropical storm Karina, which was southwest of the tip of Baja California, are expected to move over northern Baja California. That could cause thunderstorms to form over northern Mexico, and some of those storms could drift north over San Diego County.

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