Yep - it'll be hot. Likely near 100 degrees, with humidity well into the upper 80% region, or higher. Chance of thunderstorms nearly every day - but never all day.
Birding is still possible in Florida year-round, even the ugly summer can have some neat birds around if you're willing to deal with the heat. I can't say specifically what might be in the Davenport area...but some idea of the Florida birds I have down here south of Lake Okeechobee in July:
least bittern, black-crowned night heron, yellow-croened night heron, black-necked stilt, purple gallinule, cattle egret, great egret, great blue heron, green heron, little blue heron, tricolor heron, boat-tailed grackle, northern mockingbird, northern cardinal, red-bellied woodpecker, blue jay, scrub jay, cormorant, anhinga, ground dove, white-winged dove, mourning dove, collared dove, tree swallow, linpkin, wood stork, glossy ibis, ibis, black bellied whistling duck, mottled duck, roseated spoonbill, red-winged blackbird, european starling, red-shouldered hawk, cooper's hawk, royal tern, monk parakeet, nanday parakeet, brown thrasher, pelican, ring-billed gull, laughing gull, and osprey.
If you decide to come down south of the lake, there are a few easy spots to see virtually all of those birds in a day - Wakodahatchee wetlands and Green Cay wetlands, both in Boynton beach, the Boynton Beach inlet are all within 15 minutes' drive, and you'd probably net 85% of those species in a single morning or afternoon. From Davenport, you'd probably be about 2-hours' drive. The swampier areas to the south tend to have more of those water-type birds through the summer - I couldn't say if there are spots north and west of the lake that have those same species, but surely they've got a few others that you might see more commonly up there than we do here (eagles, for example).
