A weak south to southeast flow across Southern California will draw some monsoon moisture into the region today and tomorrow, with enough elevated instability for the risk of a shower or thunderstorm. Otherwise, heat will be the main story this week as high pressure amplifies across the area, pushing temperatures 5-10 degrees above average. Expect partly cloudy skies today, becoming mostly cloudy this afternoon with a few showers or thunderstorms possible. Warm and humid with highs in the lower to mid-80s. Activity, if any, will wind down after sunset, with light winds overnight as lows cool to the 50s. A little warmer tomorrow with highs in the mid-80s as isolated afternoon thundershowers continue. Daytime highs will remain in at least the mid-80s through the end of the week while overnight lows cool to the 50s. Conditions will also dry out through the middle of the week as a southwesterly flow develops. Monsoon moisture may also return over the weekend or ealry next week as some tropical moisture is drawn northward with a gradual cooling trend as high pressure shifts east.

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