An easterly wave will spread monsoonal moisture and periods of showers and thunderstorms across Southern California through Tuesday, before a developing trough along the West Coast ushers it out of the region.
The National Weather Service office in San Diego said the days will remain cooler due to the increased cloud cover and high humidity.
The best chance of thunderstorms with locally heavy rainfall will be near the mountains, according to meteorologists.
Highs on Tuesday will be 74 to 79 near the coast, 79 to 83 inland, 82 to 86 in the western valleys, 86 to 91 near the foothills, 82 to 92 in the mountains and 103 to 107 in the deserts.
Dry weather returns after Tuesday while temperatures remain slightly cooler than seasonal norms.
Another warm up is slated for this weekend and early next week, forecasters said.