Hi Bigfoot,
August in New Hampshire is definitely more comfortable than in Virginia! Granted, we do have uncomfortable humidity, but it usually only lasts for a couple days at a time. Expect average highs in the upper 70s / lower 80s, with cool, pleasant nights (perhaps a bit chilly later in the month).
The *absolute* must-see places:
- Franconia Notch State Park (esp. the Flume Gorge)
- Crawford Notch State Park
- Mt. Washington
- Kancamagus Highway
- Lake Winnipesaukee (Castle in the Clouds, Wolfeboro)
- Portsmouth (Strawberry Banke), New Castle, Rye (seacoast)
In addition to these absolute must-sees, there are a lot of other wonderful places in the state more off the beaten path. The entire length of the Connecticut River between NH and VT is lovely country. If you can, make a stop at the Cornish-Windsor Covered Bridge between Cornish, NH and Windsor, VT. The Lakes Region is also a great place to explore; Squam Lake (from the film "On Golden Pond") is particularly nice, and Sandwich is my favorite village in the state.
To be honest, it's hard to go wrong no matter what little backroad you take through NH -- you're bound to find something interesting!