Don't normally post here because much of the discussion is out of my knowledge level. But I do know that each week we pass (with cold, cool, average, or even not blazing temps) towards early September minimum is crucial. So just looking at the 6z GFS, it doesn't look that bad for surface temps. 850 temps do show pushes of much above normal temps but surface temps are at or just above freezing (more reasonable). So I think the big question is cloud cover; but again the farther into August we can get the lower the sun angel and the less affect of clear skies.
https://www.tropicaltidbits.com/analysis/models/?model=gfs&region=nhem&pkg=T2m&runtime=2018072906&fh=0