LOS ANGELES (AP) — Southern California weather is about to heat up.

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The National Weather Service says upper-level high pressure over New Mexico will begin to move westward on Wednesday and temperatures will jump above normal everywhere except at the beaches.

Maximum temperatures will rise even further on Thursday and will peak on Friday and Saturday when many valleys and interior locations reach triple digits and some beaches heat up to the lower 80s.

High pressure will begin to break down on Monday and temperatures are expected to dip slightly but remain above normal.

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Forecasters warn that the lengthy period of hot and dry conditions will increase fire danger.

August has otherwise seen some below-normal temperatures so far. Downtown Los Angeles only reached 78 degrees on Monday, six degrees below normal.

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