[Brad_G]

Personally, I prefer around 65 on a sunny day, and about 70 if overcast. Those temps are OK both riding, as well as stopped for a while without having to remove my gear.

I'm with @faffi here, 60/65 is a great temp when the sun's out and no wind. I enjoy wearing leathers and light to medium gloves. So that gives me the most protection along with comfort. When it gets hot I may only ride with boots, jeans, t-shirt, and helmet. At that point as long as you're moving temps nearing 100 are still bearable. But I don't have many cities to deal with stop and go traffic. If that were the case I'd lower my top end temp.

 

[Brad_G]

This past weekend I rode to Des Moines (~130 miles) to babysit my grandson. Instead of interstate I took the 2-lane roads. It was 90/95 when I rode up and back. Sunscreen to avoid burns to the exposed arms. I mounted a cheap $5 bottle holder for a bicycle on the crash bar. I have a Contigo insulated mug that is great at keeping things hot/cold and doesn't leak even with the vibrations of the bike. I put a couple ice cubes in it and some cold sweet tea and I have something to drink while rolling down the road. Helps on those hot summer days.