Scorching Spring Heat Wave Grips California

Sizzling temperatures set to shatter March records across the Bay Area and beyond

Mar. 15, 2026 at 5:55pm by Ben Kaplan

Got story updates? Submit your updates here. ›

A powerful high-pressure system is bringing near-record high temperatures to California this week, with inland areas like San Jose, Livermore, Napa, and Concord expected to reach the 90-degree mark. Meteorologists say the sinking air associated with high pressure is drying out the atmosphere and compressing the air, leading to the unseasonably warm conditions.

Why it matters

This type of early-season heat wave is becoming more common in California, with San Francisco seeing an additional 20 days of above-average temperatures each spring compared to the 1970s. The prolonged hot, dry weather can strain power grids, increase wildfire risk, and impact agriculture and public health.

The details

High pressure systems create sinking air, which dries out the atmosphere and compresses the air, causing it to heat up. This high-pressure system is also deflecting moisture and storms away, trapping the warm, dry air in a "heat dome" over the region. As the ground heats up, it releases more warmth into the atmosphere, further intensifying the heat.

  • The heat wave is expected to last through the end of the week (March 15-19, 2026).
  • Temperatures are forecast to reach the 90s in many inland areas, which would tie or break all-time March records.

The players

Bay Area

The San Francisco Bay Area, including cities like San Jose, Livermore, Napa, and Concord, is experiencing the brunt of the heat wave.

Got photos? Submit your photos here. ›

What’s next

Meteorologists will continue to monitor the situation and provide updates on how long the heat wave is expected to last and any potential impacts on the region.

The takeaway

This early-season heat wave is a stark reminder of the growing threat of climate change, with spring temperatures rising across California. Residents should take steps to stay cool, conserve energy, and be prepared for the possibility of more frequent and intense heat waves in the years to come.