In traffic jam, in 10 minutes it will shoot up to 239 (115 C). When I start moving again the temp will go down to 212(100C) and stays there. It will shoot up again the minute I stop or slow down.
Mine shoots up much faster than that in traffic. But runs normal at highway speeds. I can pull in the yard temps shows 190f, open the gate get back on bike and it has reached 220 or so. I don't worry about it anymore unless it pukes over. No way would I ride in city traffic in the heat of summer if at all possible to avoid. Dunno for sure about water wetter but IMO prolly a total waste of money.
Good Luck