Cabo Nights
Yes, it is cool in the evenings but the days should be wonderful. We were there the second week in January and it was in the low 80's so I would expect it to be nice. It will probably have more cloudy days or partly cloudy than for example when we were there in November but still Cabo is wonderful anytime you go!
When we checked weather.com it said it would be cloudy all week but it was proven wrong as it was sunny and warm for the first 4 days. A light wrap in the evenings should be good.
Enjoy,
Judy