Napa Breaks Heat Record

NAPA, CA — It was a record-breaking day Wednesday in Napa. The city recorded a high temperature of 103 degrees, breaking the previous Oct. 2 heat record of 102 set on Oct. 2, 1980.

A second Bay Area city, San Jose, also set a heat record of 106. San Jose's previous records for Oct. 2 were 96 and in 1980 and 2012.

Meanwhile, San Rafael reached 106 degrees, tying its record set on Oct. 2, 1980.

The heat was expected to dissipate Thursday, but not by much. The National Weather Service extended its excessive heat warning for North Bay's interior valley and coastal ranges through 11 p.m. Friday. Interior temperatures will range from the mid-90s to low 100s, regions close to the coast will range from the upper 70s to mid-80s, and regions directly along the coast will range from the upper 60s to mid-70s.

The National Weather Service said Thursday that hot and dry conditions continue with dangerous heat and potentially critical fire weather conditions for the remainder of the work week.

"The heatwave did peak the last couple of days, but impacts from moderate to extreme heat risk at times, will be felt into the weekend," the weather service said. "The beginning of next week does hint at relief from the heatwave. However, temperatures are still slightly above normal for interior locations toward the end of the extended forecast."

Weather officials said the big picture still remains the same: "high pressure overhead, clear skies, little to no marine layer, warm air mass. A mix of Heat Advisories and Excessive Heat Warnings remain."

High Temperatures Around Napa County

• Napa: high temperatures expected to reach 95 on Thursday and 93 on Friday.
• St. Helena: temps to reach 99 Thursday, 96 Friday and 100 Saturday.
• Calistoga: highs are forecast at 97 Thursday, 94 Friday and 98 Saturday.
• Yountville: high temps expected to reach 97 Thursday, 95 on Friday and 98 on Saturday.
• Angwin: high temps forecast at 93 Thursday, 89 Friday, and 92 Saturday.
• American Canyon: temps should reach 92 Thursday, 88 Friday and 94 Saturday.
• Rutherford: temperatures forecast around 100 Thursday, 96 Friday and 101 Saturday.
• Oakville: high temps expected around 99 Thursday, 96 Friday and 100 Saturday.
• Pope Valley: expect highs of 98 Thursday, 95 Friday and 96 Saturday.
• Lake Berryessa: highs forecast to reach 94 Thursday, 92 Friday and 93 Saturday.

Residents should remember that:

• Extreme heat can strike quickly and without warning.
• Older adults, children, and people who are sick or overweight are at greatest risk from extreme heat.
• Humidity increases the wind chill measured by a set heat index.

If You Are Under An Extreme Heat Warning

• Go to an air-conditioned room.
• Avoid strenuous activities.
• Be on the lookout for heat illness.
• Wear light clothing.
• Check how your relatives and neighbors are.
• Drink a lot of water.
• Be on the lookout for heat cramps, exhaustion, and heat stroke.
• Never leave children or pets alone in closed vehicles.

See updates on heat conditions from the National Weather Service Monterey San Francisco Office at weather.gov/mtr/.