Northern California is expected to enjoy a pleasant Sunday characterized by mainly sunny skies, lighter winds, and seasonable temperatures. While most areas will remain dry, there is a slight chance for showers in parts of the Foothills, Sierra, and coastal ranges as a low-pressure system approaches. Overnight, clouds will increase as this system moves to the North on Monday and Tuesday, bringing with it the potential for some light precipitation, although most rainfall is expected to remain outside the viewing area. Afternoon highs on Monday and Tuesday will be slightly below normal. As the week progresses, a ridge of high pressure will establish itself, leading to a return of North winds and warmer temperatures. By Friday, temperatures are forecasted to reach the upper 90s, with some regions possibly experiencing triple-digit heat next weekend. This shift in weather patterns indicates a transition from mild conditions to significantly warmer temperatures as summer approaches its end.