The event will start with warm temperatures in the mid to upper 70s on Thursday and Friday as the wind will be offshore, from the northeast. On Saturday, the wind will shift more to an onshore flow, and this will bring cooler temperatures. Morning lows will be chilly, in the mid 40s, with highs Saturday and Sunday in the mid to upper 60s. Mazda Raceway Laguna Seca is located in a valley, which tends to be very susceptible to fog development when there is an onshore flow. Some fog is possible on Sunday morning, but it's still a little too far out in the forecast to be very confident about it.
I'll have updates through the week on the Racecast Weather Twitter account and Facebook page, as well as my personal Twitter account, @Race4caster.