Why Morning and Evening Temperatures Feel So Different
Tomorrow's high is one number. The day you actually live is a sequence. Morning is often the cool end of the range, close to the low, because the ground has been losing heat all night. Evening is the slide back down after the afternoon peak. Those two parts of the day can be ten or fifteen degrees apart on a clear, dry day, which is enough to make one outfit wrong for half the schedule.
The difference feels larger than the thermometer gap because your body notices change. Stepping from a warm room into a 55-degree morning feels sharper than standing in 55-degree air you have already adjusted to. The same thing happens in reverse at dusk, when the air falls while you are still dressed for the high.
What drives the gap
On a clear night, the ground radiates heat efficiently and the air near the surface cools. Sunrise stops the fall, but the climb takes hours. By evening, the sun is low or gone, incoming energy drops, and cooling starts again. Clouds and humidity slow both the overnight drop and the evening drop, so morning and evening sit closer together. Wind mixes cooler surface air with milder air above it, which also narrows the gap.
A front can override the pattern. Cooler air arriving in the afternoon can make evening colder than a normal sunset drop would, or warmer air arriving overnight can make morning milder than the previous evening. The daypart temperatures show which pattern tomorrow is actually in. If afternoon is warmer than morning by several degrees, the familiar climb is in the forecast. If evening is much colder than afternoon, the drop after the warm part of the day is real, and a note on the page can say so when the hourly values support it.
How to pack for both
Look at the morning block and the evening block before you look at the high. If you leave early and come home late, you need a layer that works for the cooler end, and you can shed it at midday. If you are only out at lunch, the high and the afternoon block are enough, and the morning number is background.
Feels-like temperature, when it is shown, matters more at the cool, windy end than in still air. A 60-degree evening with a freshening breeze can feel cooler than a 58-degree calm morning. Read the wind line on that daypart before you decide the temperatures are "basically the same."
Do not average them
The midpoint between morning and evening is not the temperature you will experience. You will experience one, then the other. Averaging them produces a number that may not occur during either errand. Quote the block that matches the clock.
Cities often stay warmer in the evening than open ground, because pavement releases stored heat. A search for a downtown name and a search for a nearby suburb can disagree after dark. Pick the place you will actually be. Then let morning and evening stay two readings, not one compromise.