Warm(er) air holds more moisture than cool(er) air. The same volume of air can hold more moisture at a higher temperature than at a lower temperature.
As an example, out here in the desert of New Mexico, it’s not unusual to have daytime humidtity in the 8% – 15% range around 95F and then overnight it jumps up to 25% – 35% at 70F with no other changes.
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