Today I monitored the engine temperature via the diagnostic display mode.
At cold start it indicated 30 degrees celsius.
It heated up varying 90-92 degrees celsius.
Sorry, I don't have a converter to F right now.

Weathercondition. Hot, sunny weather 25-30 degrees celsius.
Hauling 4200 Kg, 9240 Lbs trailer included.
Overdrive off.
95 unleaded gas
99 5.4 l engine

Is the engine temperature in the normal range or is it to high.

 

Cold Start Temp = 86F
Range while running: 194-198F

How that compares? Have to check

 

From what I read that is a normal temp (195*) and the F150 run the best around that area

 

For the most part 92 - 94C according to the HEC and 180 - 185F at the mechanical temp. gauge.

 

That's where mine runs. If I put my foot in it for a while it will works its way up to 95, never been over 96 when I was watching. After warmed up only gets down to 89 when coasting down hill.

Your good to go!