I'm in the mountains of South Carolina so the weather is usually around 70-80 degrees. And I'm on a budget and I'm riding mainly on blacktop. Sorry for the lack of info I'm new to riding and the site.
You're likely to come across temperature changes with elevation, plus surprise rain, on a day long outing. Versatility is going to be your friend.
Here we are colder in the winter and much lower humidity year round. Summer days can be hot, 90's, but dry except for the thunderstorms. So my picks may not totally transfer to your summer climate.
Anyhow, I have a First Gear mesh jacket with a zip-out windproof waterproof liner. I wear it 4 seasons without problems at all. In the winter I'll wear a sweatshirt underneath it. The Versys windshield does a good job of keeping the wind off of the body, so you don't need a crazy winter snowmobiling suit to stay warm!
I love my Draggin' Jeans for all but the coldest days. The lower fairings on the Versys also do a good job of deflecting the wind. When I tuck my legs close to the bike they even stay dry in light rain! Draggin' Jeans feel about like wearing thin long underwear under a pair of jeans, so they are a bit warm when sitting still at a traffic light on a hot summer day, but once moving they are fine. Order exactly the size you are, which means get out a fabric tape measure and measure yourself. Don't trust the size printed on your regular blue jeans!
Get an inseam that is long enough. You don't want your ankles in the breeze on a cool day. You want the jeans to touch the floor when you are barefoot.
I also have a pair of Sedici over pants. These have a mesh outer layer plus some armor. These are fine in warm weather down to 55 degrees. The zip out waterproof windproof layer has been fine for me down to 32 degrees. I've never had to install the inner insulated layer!
You'll want good protective gloves. Dress for the crash, not the ride. I like AlpineStars because of the web attaching the pinky to the ring finger. In a crash, pinkies frequently get badly dislocated and broken. That web helps prevent those injuries. Look for hard armor across the knuckles. The AlpineStars Valparaiso Waterproof are perfect from below freezing on up to 55 degrees. Above that they are a bit warm. You probably want something a bit less insulated where you live. If you've got handguards on your bike you won't need as much insulation on cooler days.
Long cuffs will move water and air outside of your jacket sleeves rather than inside. On a hot day you might prefer the air inside the sleeves, but on cool or rainy days you won't. Several different pairs of gloves make sense.
A top box of some sort is handy to stash your zip out liners, etc. I've got a Nelson-Rigg semi-soft bag which straps to the passenger seat. It holds a full face helmet when I'm at work, or holds snacks, spare sunglasses, different gloves, etc etc for a fun day ride. Nelson-Rigg | Sport Touring : CL-1060-ST Sport Touring Motorcycle Tail/Seat Bag
For boots, I suggest you watch the videos and read the reviews on a site like Revzilla.com . Because your feet and lower leg are fairly well out of the main airstream, you probably want a boot that has good ventilation rather than all leather.