Water temperature guage not working properly

Hi There,
I've got a '93 e36 3251 automatic BMW. The car water temperature gauge needle does not want to raise to its normal working temperature, even
after 20kms, until when the car comes to stop-and-go traffic, or while during frequent braking, then the needle goes up.
Is that normal?? Any idea how to rectify these? Where could be the problem areas? Can a DIY fix it?
Any ideas are welcomed. Many Thanks in advance.
Best Regards, Joe.
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Sounds like a simple thermostat change will fix it.
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