{"id":7320,"date":"2026-06-15T21:02:08","date_gmt":"2026-06-15T21:02:08","guid":{"rendered":"https:\/\/sandiegorelocationnews.com\/index.php\/2026\/06\/15\/mountain-storms-and-valley-heat-in-northern-california-forecast-what-to-expect\/"},"modified":"2026-06-15T21:02:08","modified_gmt":"2026-06-15T21:02:08","slug":"mountain-storms-and-valley-heat-in-northern-california-forecast-what-to-expect","status":"publish","type":"post","link":"https:\/\/sandiegorelocationnews.com\/index.php\/2026\/06\/15\/mountain-storms-and-valley-heat-in-northern-california-forecast-what-to-expect\/","title":{"rendered":"Mountain storms and Valley heat in Northern California forecast. What to expect"},"content":{"rendered":"
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Northern California weather is getting a little bit of everything this week, from triple-digit temperatures to a chance of mountain thunderstorms.<\/p>\n

Read more B-52 crashes after takeoff at Edwards Air Force Base in Southern California<\/a><\/p>\n

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While much of Northern California and the Central Valley remains under heat alerts as temperatures climb into the triple digits, forecasters say relief is on the way.<\/p>\n

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\u201cWhile hot temperatures continue early this week, a gradual cool down is expected by the middle of the week with a return to seasonable temperatures by the weekend,\u201d the National Weather Service said Monday, June 15, in a post on X.<\/p>\n

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Until then, “dangerous heat\u201d will continue scorching parts of the region.<\/p>\n

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Cities including Sacramento, Modesto, Merced and Fresno remain under a heat advisory through 11 p.m. Tuesday, June 16.<\/p>\n

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Meanwhile, thunderstorms could develop in the mountains later this week, bringing the potential for lightning, gusty winds and brief showers, according to the National Weather Service.<\/p>\n

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Here\u2019s what to expect in the days ahead:<\/p>\n

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How long will the heat last in Northern California, Central Valley?<\/h2>\n

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According to the National Weather Service, \u201cextreme heat\u201d will impact portions of Northern California and the Central Valley through Tuesday.<\/p>\n

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Temperatures are expected to climb well above 100 degrees across portions of Northern California and the Central Valley, with some of the hottest conditions expected in the northern Sacramento Valley.<\/p>\n

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Redding could reach as high as 109 degrees, while Red Bluff is forecast to hit 107 degrees and Chico could top out around 104 degrees.<\/p>\n

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The heat will also impact Sacramento, Modesto, Merced, Fresno and numerous surrounding foothill communities.<\/p>\n

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\u201cThese hot temperatures combined with low relative humidity and breezy onshore winds, will lead to elevated fire weather conditions in the northern Sacramento Valley and adjacent terrain through Tuesday,\u201d the National Weather Service said.<\/p>\n

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By Friday, June 19, a \u201cgradual cool down with more seasonable temperatures\u201d are forecast to continue through the weekend.<\/p>\n

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Thunderstorms forecast across the Sierra Nevada<\/h2>\n

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As temperatures begin to ease across the Valley, the Sierra Nevada could see an active weather system.<\/p>\n

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The National Weather Service is forecasting a chance of mountain showers and thunderstorms on Thursday, June 18, in areas south of Highway 50.<\/p>\n

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Current forecasts show a 10% to 20% chance of precipitation in portions of the Sierra Nevada, including areas near South Lake Tahoe and Yosemite National Park.<\/p>\n

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While widespread rainfall is not expected, the National Weather Service said, thunderstorms could bring lightning, brief showers and gusty winds to small areas.<\/p>\n

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What\u2019s in the weather forecast for Sacramento?<\/h2>\n

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Sacramento is expected to remain hot through midweek before cooler, more seasonable temperatures arrive later in the week.<\/p>\n

Read more B-52 crashes after takeoff at Edwards Air Force Base in Southern California<\/a><\/p>\n

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According to the National Weather Service, the current weather forecast for Sacramento shows a high near 95 degrees and a low around 58 on Monday.<\/p>\n

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Light winds of 5 to 10 mph are expected, with gusts reaching up to 18 mph.<\/p>\n

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Tuesday will bring similar conditions, with a high near 93 degrees and a low around 58. Winds are forecast to continue at 5 to 10 mph, with gusts up to 20 mph.<\/p>\n

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Wednesday’s high is expected to reach 93 degrees before temperatures begin to ease.<\/p>\n

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By Thursday, highs are forecast to fall below 90 degrees and remain through the weekend.<\/p>\n

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How hot will it be in Modesto this week?<\/h2>\n

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The National Weather Service\u2019s current weather forecast for Modesto shows high temperatures near 97 degrees and a low around 65 on Monday, June 15, with light winds of 5 to 8 mph.<\/p>\n

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Tuesday is expected to be just as hot, with temperatures reaching 97 degrees and overnight lows dipping to around 64. Winds will remain light at 3 to 7 mph.<\/p>\n

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By Wednesday, highs should cool slightly to around 95 degrees before dropping to about 93 degrees on Thursday.<\/p>\n

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More relief from the heat arrives Friday, June 19, when temperatures are forecast to fall below 90 degrees and remain through the weekend.<\/p>\n

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Heat advisory remains in effect for Merced and Fresno<\/h2>\n

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A heat advisory remains in effect through 11 p.m. Tuesday for much of the San Joaquin Valley, including Merced and Fresno.<\/p>\n

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\u201cHigh temperatures up to 102 degrees (are) expected,\u201d the National Weather Service said.<\/p>\n

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Merced is expected to see its hottest temperatures on Tuesday, with highs nearing 98 degrees before cooling into the 80s by Thursday.<\/p>\n

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Fresno is forecast to peak around 101 degrees on Tuesday.<\/p>\n

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While temperatures will gradually decline later in the week, Fresno\u2019s highest temperatures are expected to remain above 90 degrees through Friday before more seasonable conditions arrive over the weekend.<\/p>\n

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Have a question about life in California?<\/h3>\n

How to California<\/b>\u2014 a guide to help you live, work and enjoy life in the Golden State, is here to help.<\/p>\n

We\u2019ll answer your questions \u2014 big and small \u2014 about state laws, history, culture, recreation and travel.<\/p>\n

Ask your questions in the form below (can\u2019t see it? Click here) or email howtocalifornia@mcclatchy.com.<\/p>\n

Read more Pony Express 1,900+ mile ride to Sacramento underway. How to track riders\u2019 progress<\/a><\/p>\n<\/div>\n

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