CA Weather Update: Highs near 90 to start, but cooldown is ahead [Video]

Below average temperatures are set to return by Tuesday, lasting through the work week.

SACRAMENTO, Calif — Monday will see the warmest temperatures of the year so far, but the heat will be quickly replaced by cooler and unsettled weather on Tuesday.

The valley will see temperatures rise into the upper 80s, and a few spots may hit 90 under the ridge of high pressure overhead. Downtown Sacramento reached 87 degrees on Sunday, well above the average of 75 degrees. Monday is forecast to be slightly warmer than Sunday but still much milder than the April 22 record high of 94 set in 2009.

Low pressure will replace the high pressure system as it moves east. Due to the influence of the low pressure system, high temperatures will be 10-15 degrees cooler on Tuesday compared to Monday.

The system will also promote an onshore breeze, so expect the return of the delta breeze this week in the evenings. Thursday …