A fisherman at the Ocean Beach Pier. Photo by Chris Stone

Monsoonal moisture was forecast to bring periods of clouds and even a chance for a stray burst of showers or thunderstorm in San Diego County through Monday, the National Weather Service said Sunday.

Showers developed over northern San Diego County on Sunday morning and left some very light rainfall in spots. The chance of precipitation was expected to continue into the work week.

“Monsoonal moisture will continue a chance of isolated showers and thunderstorms, but most areas will be dry,” the weather service said on Monday.

Clouds and increasing humidity were expected to help moderate daytime temperatures, except over the high deserts, where excessive heat was forecast through Monday.

“Today will be the last really warm day with widespread daytime highs near to above average for awhile. Tuesday will be noticeably cooler,” the weather service said on Monday.

Highs on Monday were forecast to be 75 to 80 near the coast, 82 to 87 inland, 84 to 89 in the western valleys, 89 to 94 near the foothills, 88 to 95 in the mountains and around 108 in the deserts.

Later this week, a trough along the West Coast is forecast to bring a drier southwest flow aloft, and cooler weather.

On Tuesday, the winds are likely to weaken as the ridge to the north collapses and the trough deepens from the north as atmospheric moisture dries up over the mountains and deserts, forecasters said.

This will not be the case over the coastal basin though, because low pressure will be slowly developing in the mid-lower atmosphere just off the coast, the weather service said.

This flow will favor a deep marine layer and more low clouds into next weekend.

City News Service contributed to this report.

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