With the weather so diverse on the Monterey Peninsula you can start off your trip on a completely sunny day and wind up in a cold, windy, foggy area. It's always good to bring a jacket on your sight-seeing trip no matter the weather. One of the great ways to keep track of the weather day is with the numerous live webcams in various local areas. We have some of them listed here
Pebble Beach Golf Course - This will give you the weather in Pebble Beach from different points of view. The fog is nice but, it's always better to see everything on at least a partial sunny day.
Big Sur - There is no place like Napenthe restaurant on the coast and this view will tell you what the weather is like
Port of Monterey - From the top of the Portola Hotel