March Honeymoon

Charleston is COLD in March, and can be very windy. Weather in the south begins to be nicer the closer you are to mid or late April. I would go to Saint Augustine if you do have your honeymoon in March, but would inquire the locals as far as what the weather is like at that time of year. The Grand Canyon will still be COLD and very dry. The wind will whip you if you are not prepared. Spring doesn't hit Arizona until late March/ early April.

I've been to Charleston and Savannah, and they're both packed with history and charm. Weather-wise, March should be pretty pleasant in the South. Maybe a tad rainy, but nothing too crazy. Grand Canyon might still be a bit chilly, but it's breathtaking any time of year. Can't go wrong with any of your choices, but my personal pick would be Charleston or Savannah for that perfect mix of history and coastal vibes.