San Diego's Weather Forecast for July 9, 2024: Heat continues, then it turns more humid

Posted at 9:08 PM, Jul 09, 2024

It was another record-breaking day! Ramona hit 99 degrees, breaking the previous record of 98 from 1995, and Campo hit 106, breaking the previous record of 105 degrees from 2002. Tomorrow will be just as hot, and I'm forecasting record highs in Ramona, Campo, Borrego Springs, and Palomar Mountain.

The high pressure that has been anchored over California since last week has shifted slightly south bringing hotter temperatures locally. Highs will be trending 5 to 15 degrees above normal. Nearly the entire state is under Excessive Heat Warnings due to the widespread risk of heat-related illnesses.

An Excessive Heat Warning is in effect for the inland and mountains until 9pm Thursday for temperatures between 90 and 108 degrees.

An Excessive Heat Warning continues in the deserts until 9pm Friday for temperatures soaring between 115 to 123 degrees!

Overnight temperatures in the deserts will remain warm in the 100s and 90s most of the night only briefly dipping down into the 80s in the morning making it even harder to cool off. The mountains will be in the 70s most of the night only dipping into the 80s by the morning while the coast and valleys will be in the 60s.

The marine layer will keep things cooler along the coast but it will be quite humid. Morning clouds will clear back to the coast each afternoon, but many beaches will be stuck in the clouds all day.

By Saturday, we'll have noticeable cooling as the ridge of high pressure moves toward the four corners. While temperatures will drop back near normal, humidity will be on the rise as monsoon moisture arrives bringing a chance of showers and thunderstorms near the mountains and deserts with a slight chance for the inland valleys.

These hot and dry conditions will lead to elevated fire danger. Now is a good time to check your cars for loose tire tread or parts—anything that could easily spark a fire. In addition, make sure you have a to-go bag and working flashlights in case of an emergency or power outage. Also, prune and trim trees and shrubs to make a defensible space around your home.

Tips to Stay Safe in the Heat:
Excessive heat is a danger to anyone, especially those with respiratory issues, people that work outdoors, children and the elderly. Make sure outdoor pets have safe shelter and cool water. Cars turn into ovens in a matter of minutes, so be sure to check the back seat and never leave children or pets in the car. Wear light-weight, light-colored, loose-fitting clothing and stay hydrated! Avoid strenuous outdoor activities, enjoy air conditioning whenever possible and if you're working in the heat make sure to take breaks often and drink plenty of water. Check on the eldery and family and friends without air conditioning.

Wednesday's Highs: 
Coast: 72-83°
Inland: 90-100°
Mountains: 95-106°
Deserts: 117-122°

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