With the hotter days rolling in, significant hatches are happening later in the evening, beginning around 7 to 8 p.m. Fishing has been great even during the hottest hours of the day (usually occurring between 3 and 7 p.m.), and absolutely fantastic as the sun is setting.
As far as bugs go - baetis, a LOT of baetis and few PMDs during the hot hours. During evening and late evening you’ll be getting a real mixed bag - Baetis, Caddis, PMD and even a few Green Drakes. Always throw dries from an upstream position relative to fish. If you’re up for it, cool, early mornings in the S-turns allow you to beat the usual cramped crowds. Good luck!