Heat Damage on Indeterminate Tomatoes: Yellowing, Browning, Drying - It's Not Disease! -TRG 2016
Once the temperatures get into the mid 90's F for a couple weeks, tomato plants respond. They drop leaves, slow growth, stop flowering, drop blossoms and wait it out. If you get to 100 F, your tomatoes are going to look terrible. However, it is not