Topline:
Los Angeles, Ventura and Santa Barbara counties could see scattered showers between tonight and Wednesday morning due to tropical moisture that's come up from the south. Heavier rain will occur to the north.
More heat: Warm ocean temperatures and light offshore winds are driving the humidity and heat we're feeling. Temperatures will peak on Tuesday, as downtown L.A. reaches the low 90s and the valley areas climb into the high 90s.
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Rain is coming, followed by a cool down
Then a cool down: Starting Wednesday, temperatures will drop back into the low 80s for downtown and the low 90s for the valleys, as some sea breezes return.