OK. Just to make sure, I assume you are talking fahrenheit (since 150degC would be over 300degF! and that WOULD be dangerously hot).
I live in the Houston area and air temps are up in the mid-upper 90's now (degF!) Temp on the road is probably another 10-20 degrees above that depending on clouds and wind. Running on the highway with cross or head wind I am getting about 205-210 degF after installing my new Jagg oil cooler. Prior to that it was running at least 10-15 deg hotter. If I am running with the wind the bike is a bit hotter depending on wind speed. Once I get into stop-and-go for an extended period (30 min or so), the temp climbs up to the 225-230 range and sometimes higher with a passenger.
The bike is an '03 UC. During the Spring-Fall period, I do not run the lower fairings.
TQ