Sizzling weekend ahead as heat wave continues. Here’s how hot it is expected to get (2024)

For the most part, temperatures in Sonoma and Napa counties aren’t expected to reach as high as they did on Tuesday, but weather officials are still recommending extreme caution.|



This week’s heat wave across the North Bay and along the North Coast is expected to crest Saturday, with widespread temperatures back in the triple digits, a few degrees hotter than Friday.

For the most part, temperatures in Sonoma and Napa counties aren’t expected to reach as high as they did on Tuesday, but weather officials are still recommending extreme caution, citing health risks and wildfire danger.

The current red flag warning, extended on Wednesday into the weekend, expires at 9 p.m. Saturday. The warning is for North Bay interior mountains, East Bay Hills and Santa Cruz Mountains.

Lamont Bain, a meteorologist with the National Weather Service, said the red flag warning covers “higher terrain” of Sonoma and Napa counties, as well as much of Lake and Mendocino counties, where temperatures are higher, humidity is low and critically dry fuel abounds.

Meanwhile, local public health officials on Friday extended a separate heat advisory into next week, in response to the National Weather Service extending its own excessive heat warning until 11 p.m. Wednesday, July 10.

Temperatures will increase a few degrees f/m yesterdays highs, & tomorrow looks to be the hottest day of the heat wave w/ impacts continuing to compound into @ least the beginning of next week. Please do not use fireworks either, any fire ignition attm can spread rapidly. #CAwx

— NWS Bay Area 🌉 (@NWSBayArea) July 5, 2024

On Friday, high temperatures in Sonoma County ranged between mid to upper 50s along the coast to 104 degrees inland in Cloverdale. Santa Rosa logged 95 degrees at the Charles M. Schulz-Sonoma County Airport.

It was in the mid 70s in Bodega Bay, and about 56 just south of there.

Temperatures in Napa County on Friday ranged from 90 degrees in American Canyon to about 95 in Napa. In the Lake Berryessa region, one of the hottest, it got the mercury edged several degrees above 100.

On Saturday, highs are expected to be one or two degrees hotter across the region. Bain said northern Sonoma County, near Cloverdale, could get temperatures as high as 110 degrees.

Some places on the North Coast could see temperatures peak above Tuesday’s highs.

In Ukiah, where the mercury reached 108 degrees on Tuesday, is expected to hit 115 on Saturday, weather officials said.

As temperatures began climbing Friday, local health officials warned of the dangers of heat exposure.

In a press release announcing the extension of the local heat advisory, Dr. Tanya Phares, Sonoma County’s health officer, said current weather conditions can cause heat stroke, worsen chronic health conditions and lead to severe complications and even death.

“Extreme heat is very taxing on the body and significantly increases the potential for heat-related illnesses, especially for those working outdoors or participating in outdoor activities,” Phares said in the statement.

Symptoms of heat stroke include: body temperature of 103 degrees or higher; hot, red, dry or damp skin; fast, strong pulse; headaches; dizziness; nausea; confusion; and passing out.

Safety tips for heatwaves

When temperatures climb to unhealthy levels, Sonoma County health officials recommend drinking plenty of fluids and not waiting until you’re thirsty.

Other tips include:

* Avoid alcohol, caffeine and sugary drinks. If your doctor generally limits the amount of fluid you drink or has you on water pills, ask how much you should drink while the weather is hot.

* Never leave anyone, including children or pets, in a parked car, even briefly. Temperatures in the car can become dangerous within a few minutes.

* Use air-conditioning to cool down or go to an air-conditioned building, such as a mall or movie theater, or go to one of a number of cooling centers available throughout Sonoma County.

* Take cool showers and baths.

* Stay out of the sun as much as possible and when possible avoid strenuous activity during the hottest part of the day (between 11 a.m. and 5 p.m.). Take regular breaks from physical activity.

* Wear sunscreen and a ventilated hat (e.g., straw or mesh) when in the sun, even if it is cloudy.

• Some medicines affect the body's ability to sweat and stay cool, including antihistamines, antidepressants, over-the-counter sleeping pills, anti-diarrhea pills, beta blockers and psychiatric drugs. But do NOT stop taking medication unless instructed to do so by your doctor.

• Check on your neighbors, especially the elderly or those in poor health to see if they need assistance.

• Don’t walk your dogs in the heat. Pavement temperatures can be 40 to 60 degrees hotter than air temperatures. Always check the pavement to see if it is cool enough for them to walk on.

Source: Sonoma County Public Health Division

The local heat advisory applies to inland areas of Sonoma County where high temperatures are forecast to range from the mid-high 90s to the low 100s. Santa Rosa is expected to remain in the 90s all next week, county officials said.

The current heatwave has heightened concerns about wildfire in the area, especially with the introduction of fireworks over the Fourth of July weekend. Use of any fireworks, even state-approved ones, is illegal across Sonoma and Napa counties outside of the July 4 holiday.

On Thursday into Friday, Cal Fire and local fire crews received hundreds of calls for service and responded to dozens, including several small fires linked to fireworks, as well as medical calls.

Karen Hanco*ck, a spokeswoman with the Sonoma County Fire District, said higher humidity overnight on Thursday and low wind aided firefighting efforts but the heat will remain a concern over the next few days.

The holiday weekend “always puts us on edge,” Hanco*ck said, but even more so this year with early fire activity and warm weather.

“We just want everyone to stay safe,” she said.

Bain, the National Weather Service meteorologist, said the current heat wave is caused by a high pressure system that’s situated itself over Northern California. The National Weather Service said much of the Western United States is experiencing a similar heat wave.

Such high pressure systems generally tend to suppress the marine layer, which offered some relief on Thursday but less so this weekend.

The good news is that there’s been an absence of widespread offshore winds, which would increase fire danger. Even so, Bain said though there isn’t a strong wind component to the current heat wave and red flag warning, local residents should be aware of the danger of wildfire.

“The fields are just so dry, it doesn't take a lot to get an ignition,” he said. “Obviously, with the Fourth of July and even holiday weekend, people like to shoot off fireworks and that can second certainly cause (fire).”

You can reach Staff Writer Martin Espinoza at 707-521-5213 or On Twitter @pressreno.

Sizzling weekend ahead as heat wave continues. Here’s how hot it is expected to get (2024)


How hot is it during a heat wave? ›

Heat waves typically are defined as three or more consecutive days with temperatures of 90 degrees or higher. In Hartford, the high Monday reached 94 degrees yesterday, and is expected to hit 93 Tuesday and 90 on Wednesday.

Why would a city like New York experience worse effects from a heat wave than a small town? ›

Extreme Temperatures

Extreme heat will have a greater impact on urban areas which have many heat-absorbing surfaces like roads, parking lots, and buildings, and few cooling green spaces and trees.

How will a sudden increase in temperature during a heat wave affect the ecosystem? ›

Ecological impacts: Heatwaves, without concomitant increases in precipitation, can lead to water shortages and increased stress for plants, particularly in arid regions.

What are some tips to do or go during a time of heat waves? ›

Stay Cool
  • Stay in an air-conditioned place as much as possible.
  • If your home does not have air conditioning, go to your predesignated cool location.
  • Wear lightweight, loose clothing and take cool showers or baths.
  • Limit your outdoor activity. If you must work outdoors, schedule tasks earlier or later in the day.

How long will a heat wave last? ›

A high pressure system in the upper atmosphere traps heat near the ground, forming a heat wave (for North America in this example.) Heat waves form when a high-pressure area in the upper atmosphere strengthens and remains over a region for several days up to several weeks.

What is the hottest the Earth has ever been? ›

Our planet probably experienced its hottest temperatures in its earliest days, when it was still colliding with other rocky debris (planetesimals) careening around the solar system. The heat of these collisions would have kept Earth molten, with top-of-the-atmosphere temperatures upward of 3,600° Fahrenheit.

How bad will global warming be in 2030? ›

30 in Proceedings of the National Academy of Sciences, provides new evidence that global warming is on track to reach 1.5 degrees Celsius (2.7 Fahrenheit) above pre-industrial averages in the early 2030s, regardless of how much greenhouse gas emissions rise or fall in the coming decade.

Why does NYC feel so hot? ›

Also, New York's enormous population, human activity, and vast amounts of large buildings and streets, which absorb sunlight during the day, contribute significantly to the urban heat island effect. Were it not for this phenomenon, its climate would probably be within the humid continental temperature range.

Has NYC gotten hotter? ›

Global warming means New York City will also get hotter. It already has: average temperatures at Central Park, for instance, have risen a quarter of a degree per decade since 1900 — meaning the city is about 3 degrees warmer than it was during the Gilded Age.

What was the worst heat wave in history? ›

July 1743 heatwave in China - Beijing reached 44.4 °C (111.9 °F) on July 25, higher than any modern records.

Are summers getting hotter? ›

So we're just shifting the baseline climate to warmer temperatures. Our summers have warmed about 3 or 4 degrees Fahrenheit compared to pre-industrial conditions. And so these heat waves are just 3 or 4 degrees warmer than they used to be.

What is happening to our world? ›

Takeaways. We already see effects scientists predicted, such as the loss of sea ice, melting glaciers and ice sheets, sea level rise, and more intense heat waves. Scientists predict global temperature increases from human-made greenhouse gases will continue. Severe weather damage will also increase and intensify.

How to survive heat without AC? ›

Use box fans and ceiling fans to promote air circulation throughout your home. Opening doors in the house and using box fans to push hot air outdoors can function as an "exhaust" system and draw cooler evening air into the house. In the cooler evenings, open all windows and promote as much air circulation as possible.

How to cool down quickly? ›

Tips to reduce body temperature
  1. Drink cool liquids. ...
  2. Go somewhere with cooler air. ...
  3. Get in cool water. ...
  4. Apply cold to key points on the body. ...
  5. Move less. ...
  6. Wear lighter, more breathable clothing. ...
  7. Take heat regulating supplements. ...
  8. Talk to a doctor about thyroid health.

What are the first signs of heat exhaustion? ›

Symptoms of heat exhaustion include:
  • Headache.
  • Nausea.
  • Dizziness.
  • Weakness.
  • Irritability.
  • Thirst.
  • Heavy sweating.
  • Elevated body temperature.

At what temperature is it considered hot? ›

What is the heat index?
ClassificationHeat Index
Caution80°F - 90°F
Extreme Caution90°F - 103°F
Danger103°F - 124°F
Extreme Danger125°F or higher

What was the hottest heat wave ever recorded? ›

The hottest temperature ever officially recorded on Earth was 134 F (56.67 C) in July 1913 in Death Valley, though some experts dispute that measurement and say the real record was 130 F (54.4 C), recorded there in July 2021. “It's impressive,” Thomas Mrzliek of Basel, Switzerland, said of the triple digit heat.

What does a heat wave feel like? ›

Symptoms can include sharp, intense pain lasting anywhere from a few seconds to several minutes, extreme sweating, and flushed, red, or moist skin.

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