By admin 
The unofficial start of summer is arriving with near-perfect weather for backyard barbecues, lake trips and Memorial Day travel across Northern California — though forecasters warn gusty winds and dry conditions could also elevate wildfire danger through the holiday weekend.
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After a hot Friday that will push Sacramento into the low 90s, temperatures are expected to gradually cool through Monday as stronger Delta breezes and onshore winds bring more comfortable conditions to the Valley, foothills and Sierra, according to the National Weather Service in Sacramento.
“There’s a healthy Delta breeze,” expected Friday evening, the weather service said, helping cool Sacramento and surrounding areas after daytime highs climb into the low 90s.
Forecasters are also warning hikers and campers to stay alert in the mountains Friday afternoon, where isolated thunderstorms could develop along the Sierra crest and Coast Range.
The weather service said there is a 15% to 25% chance of thunderstorms along the Sierra crest Friday afternoon and evening. Any storms that form could produce lightning, gusty winds and small hail, potentially affecting outdoor recreation heading into the holiday weekend.
At lower elevations, forecasters are increasingly focused on fire danger as dry vegetation combines with gusty winds and low humidity. The strongest winds are expected from Saturday through Memorial Day, particularly across the Sacramento Valley, Delta and nearby foothills. Forecasters said those conditions could allow fires to spread more rapidly if ignitions occur.
The National Weather Service urged residents to be cautious with campfires, barbecue grills, fireworks and anything else capable of sparking a fire as Northern California moves deeper into the dry season.
Here’s how temperatures are expected to shape up across the region through Memorial Day:
Sacramento Valley
On Friday, forecasters say the Valley should see highs in the low 90s, with Sacramento expected to top out at 92 degrees. Overnight lows are forecast in the low-to-mid 50s, with Sacramento dipping to about 54.
Saturday brings cooler weather, with highs expected in the mid-80s across the Valley. Sacramento is forecast to reach 85 degrees before falling to around 53 overnight.
Conditions stay similar Sunday, with highs in the low-to-mid 80s regionwide. Sacramento is expected to hit 84 degrees with overnight lows around 53.
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By Memorial Day, temperatures are expected to cool into the upper 70s to around 80 across much of the Valley. Sacramento is forecast to reach 79 degrees with a low around 52 Monday night.
Foothill communities
Friday is expected to bring highs in the upper 80s to foothill communities. Auburn is forecast to reach 88 degrees, with overnight lows settling into the mid-50s at about 56 degrees.
Saturday cools slightly, with highs in the low 80s across the foothills. Auburn is expected to top out near 83 degrees before dropping to about 54 overnight.
Sunday’s forecast calls for more sunshine and highs in the low 80s. Auburn is forecast to reach 82 degrees with overnight lows around 53.
On Memorial Day, foothill communities are expected to see highs in the upper 70s. Auburn is forecast to hit 78 degrees before cooling to about 50 Monday night.
Tahoe and Sierra
In the Sierra, Friday brings the potential for isolated afternoon showers and thunderstorms along with highs in the upper 60s. South Lake Tahoe is forecast to reach 67 degrees with overnight lows around 44.
Saturday is expected to be sunny with highs again in the upper 60s across Tahoe and Sierra communities. South Lake Tahoe is forecast to top out near 67 degrees before dropping to about 43 overnight.
Sunday should be slightly warmer, with highs near 70 in many Sierra communities. South Lake Tahoe is expected to reach 69 degrees with overnight lows around 45.
By the Monday holiday, temperatures are expected to cool back into the mid-60s in the Sierra. South Lake Tahoe is forecast to hit 66 degrees with overnight lows near 40.
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