A looming monsoon sky. Photo via Pexels

Monsoonal moisture will spread over the region Sunday and through the coming week, with daily chances of thunderstorms over the mountains and deserts each afternoon, the National Weather Service said.

It will be cooler along the coast, thanks to a persistent marine layer, but forecasters said it will feel muggier.

Highs on Sunday will be 71 to 76 near the coast, 75 to 80 inland, 77 to 82 in the western valleys, 87 to 92 near the foothills, 62 to 69 in the mountains and 78 to 84 in the deserts.

Sunday afternoon should see likely development of cumulus clouds over the highest elevations with a 10% to 20% chance of showers and thunderstorms through early Sunday evening. Significant rainfall is not expected.

A better chance of afternoon thunderstorms was expected to arrive Monday, with a slight chance of showers and thunderstorms over the desert regions along with a slight risk of localized flash flooding, typical for monsoon season.

City News Service contributed to this article.