If it hasn't yet felt like a truly Sacramento summer, just wait for the weekend.
Temperatures will start to rise midweek and peak Friday through Sunday, with a high of 104 degrees expected Saturday, making it the hottest day of the year thus far, according to the National Weather Service.
The spike is caused by a ridge of high pressure moving across the state, said Karl Swanberg, a forecaster with the National Weather Service.
Sacramento has had three days of 100-degree weather this year so far, all in June.
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The peak heat will extend across the region, and those headed to Tahoe should expect highs in the 80s in Blue Canyon and highs of 75-85 degrees in South Lake Tahoe, with lower temperatures near the shoreline, and lows in the 40s-60s in the area.
The foothills will also get heat in the mid-90s, and lower-elevation areas could feel triple-digit high temperatures. Nights will cool down to the low 60s.
Early season water temperatures are still relatively cold, and river-goers should be careful, the National Weather Service said. People are also advised to stay out of the sun during the middle part of the day and reduce outdoor activity.