As the San Francisco Bay Area enters the seventh day of a historic heat wave, forecasters are warning people to drink plenty of water and stay inside if possible due to persisting “dangerously hot” conditions.

Previous record highs in the city of Napa, as well in the city of Santa Rosa — both made in 1980 — were either tied or broken last week, officials said, while a third local record, set in 1930, may have been broken on Sunday.

However, the heat will not likely surpass daily records this week — and here is why. In early October 1987, a strong high-pressure ridge and Santa Lucia (northeasterly) winds triggered an intense heatwave across California.

“All of the heat warnings and advisories — they’ve all been extended,” NWS meteorologist Nicole Sarment said. “We’ve got a tiny disturbance (Friday), and the main threat from that will be an increase in winds, and there’s some degree of moisture. But this isn’t over yet.”

Some cities in Northern California are seeing temperatures in the upper 90s and lower 100s. Temperatures are generally in the mid-80s this time of year.

An excessive heat warning has been extended for much of the Bay Area through late Friday night, as a late season heat wave continues to bring hot temperatures to the region, some of which have been record-breaking.

The Bay Area roasted under more scorching temperatures Sunday, but conditions predicted to cool down Monday, meteorologists said. After San Francisco hit 97 degrees Sunday, its hottest day of the year,

Learn more about the latest Phoenix area weather forecast and conditions with Most Accurate Forecast from ABC15.