How close is Northern California to its first 100-degree day?

Added: 2026-05-19

[00:00:00]Northern California's heating back into the upper 90s this week, but just how close are we to our first 100° day of the year? From the Jacobin Myers backyard, here's what weather from past years tells us. Now, historically, our first triple-digit day usually happens around early to mid-June, though some years we hit 100 even earlier. For now, we're not quite there yet, but we are starting to move closer to Sacramento's true summer pattern. And as those temperatures start climbing, don't forget to stay hydrated, limit your time outside during the hottest part of the day, and make sure to never leave people or pets inside of a parked car. Have a great week.