Every day, each part of the earth gains heat from the sun while the sun is up and and also constantly loses heat to space. As long as heat in > heat out for the day in your location, tomorrow will (on average) be hotter. This is true all throughout the summer in most places, both before and after the summer solstice. The solstice would just be the day when the earth tends to heat up the most. In reality, things like clouds, wind and elevation add a little bit more randomness to the temperature day to day and place to place, but that’s the general pattern.
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