My husband and I are looking into a holiday cruise in Deecemebr to Mexico including Mazatlan, Acapulco, Ixtapa, Puerto Vallarta, and Cabo San Lucas. Will it be too cold for swimming? What will the weather be like?

I don't think it is ever too cold for swimming in Mexico. I swam in the water at Cabo in November. The other ports will be warmer than Cabo.

Puerto Vallarta in December would typically be sunny with temps in the high 70 or low 80F.

I agree with RB...never too cold to swim in Mexico. If you go to weather.com and then click on "vacation planner" you can check out temps for any city, on any month and it will give average temps for that region. Great resource for vacation weather but you can't go wrong heading south in Decemenber!

The first week in December usually has fabulous low prices for cruises!!