08 civic - 66K - Serpentine belt/ Tnsioner squeak noise?

08 Civic lx - 65K.

I'm noticing either one of the following issues only during the cold temp and only during morning/ evening after 8-9 hrs parking

1) Mild roller noise - Noticeable/intensity increases very clearly while applying acceleration - Goes away after 2 mins of driving - once again only during cold temp especially started noticing this only this winter
2) When I start the car after a long parking / especially during cold temp and rainy day - as soon as I start the car I can hear the drive belt squeak noise which goes away within 5 secs

I got a quote from two places to replace the serpentine belt and belt tensioner(set). Honda dealer - $360 Napa - $300. Both dealer and napa advised me that since I'm only noticing this only during cold temp asked me to wait until the sound becomes very intense - they suggested this might be a winter/cold temp related thing and will go away.

Based on the above desc please suggest me what to do? Do I need to replace this immediately or how serious is this?

If ti is only doing when it is cold or every once in a while. It will be just fine to wait a while if you want. It will not do any harm if you wait a while.