Mini Heat Wave To Scorch NorCal This Week, Temps Could Break Records

SAN FRANCISCO, CA — Northern California is bracing for its first significant heat wave of 2025, with temperatures expected to soar by the end of the week.

Some areas could see daytime highs approach — or even break — calendar records, which are the highest temperatures ever recorded on that specific date, according to the National Weather Service’s Tuesday forecast discussion.

A strong ridge of high pressure will build over the region, leading to widespread hot and dry conditions, according to the National Weather Service.

The heat is anticipated to peak on Friday and Saturday, with inland areas experiencing the most intense temperatures. The NWS has issued an Extreme Heat Watch for parts of Northern California, including the Sacramento Valley, where highs could reach between 97 and 107 degrees.

Here's what Friday's peak temperatures could look like across NorCal:

The heat wave will be felt statewide in what could become the first widespread heat outbreak of 2025, the San Francisco Chronicle reported. Temperatures are expected to push up to the hottest day of the year so far.

“This is a little early to be experiencing these kinds of temperatures,” Fox40 meteorologist Dennis Shanahan said.

Temperatures are expected to ease up in both NorCal and SoCal by the weekend, but it is expected to remain warm in many areas. "Widespread cooling" is expected to bring relief by Sunday and Monday.

Weather experts are urging Californians to prepare for the heat wave and check on vulnerable family members and neighbors.

Heat Safety Tips From NWS:

• Stay Hydrated: Drink plenty of water throughout the day.
• Limit Outdoor Activities: Avoid strenuous activities during the hottest parts of the day (10 a.m. to 4 p.m.).
• Wear Appropriate Clothing: Light-colored, loose-fitting clothing can help keep you cool.
• Check on Vulnerable Individuals: Ensure that children, the elderly, and those with health conditions are staying cool and hydrated.
• Never Leave Children or Pets in Vehicles: Temperatures inside cars can rise rapidly to dangerous levels.