FG, err on the side of caution, avoid mid day heat, drive in the morning and evenings, those temps are getting up there.
If your cooling system is in preemo shape, water jackets, water pump, rad etc, then some moderate dring in hot temps can be done. Its when you start pushing it up hills, high speed on the freeway, pulling a load etc.
Engine Temps of 180 to 195 aren't going to kill it, it's when they rise over 200, and are not going to cool down, is when stuff happens.
Why don't you go for a short, lower speed ride today and see what happens.........Fred