Do you know what variety they are?

I wouldn't swear to it, but I am pretty sure they are Big Boy or something
like that. I bought them as plants from Wal-Mart.

Also, since you don't say where you're located, it may be too early in
the season for ripening tomatoes.

I live just south of Omaha, NE.

As for the temperature, we have had it over 100 several days and the
evenings haven't been much relief (sometimes the low is not even down to
70).

The only other thing I can think of is to not watch as the first reply
suggested. LOL

Cecelia