Temperature Gauge goes up when I am in traffic and goes back down when driving?

[Psil0Cybin]

2001 Pontiac Sunfire
I recently had my water pump, thermostat replaced along side with a coolant flush due to a leak, after getting my thermostat replaced I noticed that when I drive and sit in traffic my temperature gauge will go up a very little bit (few lines) so maybe to 95-97 degrees Celsius and the second I pick up speed after the red light I notice it goes back down to 90 degrees Celsius. Prior to having coolant issues, my car always just sat at 90 degrees Celsius since I got it, and would maybe go up just a line and would go back down to 90.The Car mechanic who fixed the car, said the fact that now I see my temperature rise more on the gauge this was normal for the fact that I am sitting in traffic and just to make sure It never hits the red point (Which I am not close to touching, I am just worried that if one day I will get stuck in traffic it might get worse if something is actually not working or not right)..
Does that seem accurate, or is something wrong?
Some of the posts I am reading online say its normal, some say its the thermostat, etc.. (Which Is making me a feel a bit worried because I just paid money to get all these problems fixed..)
Could it be a bad thermostat? or now because I just got a new thermostat it is more accurate?

Thanks for your help in advance,
Psil0

 

[melsg5]

thats normal. it's going from 194 to the low 200s

 

[Zimgxp]

The fans should come on between 230 and 240.

 

[sunfire2door]

Normal, my Sunfire does the exact same thing, goes past 90 degrees in traffic, and have sometimes had it idling for over half an hour with it not going to the H.

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[Psil0Cybin]

Perfect thanks guys! Its normal, as long as the temp goes down...I now know!
thanks, I noticed that my fan kicked in when it got a little higher above 90.