INLAND EMPIRE METRO: Partly cloudy but mostly sunny Sunday and Monday. A Heat Advisory until 8pm Saturday. Highs near 100. Moonlit skies at night with lows around 73.

MOUNTAINS: A 50% chance of showers and thunderstorms Saturday diminishing Sunday. Otherwise, partly cloudy and breezy at times. Resort-level highs from the low 80s to the low 90s.

DESERTS: Showers and thunderstorms regrouping in the afternoons through Sunday. Winds occasionally to 25 miles an hour. Highs through Sunday from the upper 90s to near 105.

BEACHES: Mostly sunny with afternoon highs in the upper 70s. Partly cloudy at night. Light winds. Surf 2-5 feet. Water 62-71.

SUMMARY: A weekend of heat and slightly higher humidity is on deck for the Inland Empire and inland Southern California. There is a Heat Advisory for the Metro area until 8pm Saturday.

Summer’s longest heat wave is likely to continue into next week. The Riverside-San Bernardino area has endured seven consecutive days of triple digit heat. Friday maxed out at 104 in San Bernardino and 102 in Riverside.

Higher humidity and a rising chance of showers and thunderstorms are getting the attention of mountain and desert dwellers. In the Metro area, chances of any rain is only 10%-20%.

Forecasters see diminishing thunderstorms early next week but increasing again later in the week. Temperatures could crank down a few notches.