Originally Posted by JoeReal

The really best time to graft during late spring to early summer time is early in the morning, an hour before until about a couple of hours past sunrise. At this early morning time, temperature of the scionwood and the air is not extreme, allows for your grafted scionwood very nice acclimitization as the day progresses. If you have grafted during the hottest time of the day, your scionwood in cold storage will suddenly feel like baking in the hot sun in so short a time. Although you will still get 100% take, the resulting scionwood will sometimes become stunted or take a long time to sprout. Hot days in spring to summer time, you will have to shield the graft from the sun.

Evenings when the temperature has cooled down is the second best time to graft. Just bring your shop lights. But if you are in Coastal Areas like where Benny is, or it is during the cool days of spring, anytime of the day is a good time to graft.