Try a rinseless wash if it's not too dirty. If you're unfamiliar, Google it. There are dozens of good ones available.
If you want to keep doing a traditional hose/bucket wash, use something like Adam's Detail Spray and spritz the bike down immediately after the final rinse. This will help sheet the water and greatly reduce the formation of waters spots. It will also add some lubrication and gloss to the final dry.

 

pick up a portable patio umbrella with a stand to provide some shade. I don't recommend soft water, it will make things rust.

 

Get a longer hose,Reminds me of the fireman joke on their honeymoon!

 

As someone else said, a pop up canopy. Harbor Freight, Home Depot Lowe’s, etc. for 200 bucks. I have one and use it when I wash and work on my bike (or Jeep) because I don’t wanna bake in the hot TN sun and get heat stroke lol…

 

Gizmo's suggestion is solid, TnFatboy is an obvious suggestion, but it's good advice...if you can't do it in a garage, a canopy is a great option...in fact, i have a garage, and prefer to wash the bike under a canopy...it's way brighter

try a waterless or rinseless wash

some suggestions

Waterless: ECH2O by Carpro
Rinseless McKee's N-914 or Wolfgang's Uber

 

Why not do it morning or late afternoon? Those seemed the best suggestion on here. No fuss, no buying anything,

 

This to prevent spotting Adam's Rinse Aid (adamspolishes.com)
and this remove spotting Adam's Water Spot Remover (adamspolishes.com)

 

If bike isn’t coated in heavy layers of dirt and grime, I run a California duster LIGHTLY over the bike and use a waterless wash like McGuires or Harley’s cleaner & polish. I keep bugs off with Harley bug remover. I prefer not to use water, unless it gets filthy or I get caught in the rain. Bike looks like new still and there are no scratches in my clearcoat. I enjoy keeping my ride clean, so I wipe her down almost after every time I take her out. Usually the next day when she cools off of course.

 

People still use the california duster? No thanks.
I dont believe that Harleys cleaner and polish is a WW. If it is, its not a very good one.

Not to be a jerk, but paint is only perfect one time. If you are using a duster on your paint, there is micro marring somewhere. Put a swirl finder light on it, they tell you everything you want and dont want to know

 

I have a gallon of RO water sitting near by when I'm washing the bike primarily because the local water has lots of soluable solids any remaining water will leave spots. I will also spray the washed parts to keep them wet until its fully washed. Then I blow dry it best I can. Then pour the RO water over the bike and blow again. And then a light drying with microfiber towels if needed.

If I keep a good coating of wax on the bike, water rolls off easily and makes the blow drying part easier and quicker too. But with my poor water quality, I do a final rinse with RO to minimize water spot build up in places I can't easily dry.

Paul