Summertime is a time for travel. Traveling involves packing. Some thoughts on packing:
Accept and embrace the fact that packing is a necessary part of traveling.
Accept that some ‘packs’ are easier than others.
Packing doesn't mean you have to re-assess your entire wardrobe.
Yes, weather is oftentimes a consideration but being unprepared for unexpected weather can add to the excitement.
If you're flying, remember that airlines want you to take less and penalize you (negative re-enforcement) for over packing.
And remember that your baggage is subject to inspection.
Make a list of what to pack. Keep the list. After the trip, make notes of what you didn't need.
Next time you pack, ignore the notes on the last list.
Safe travels.