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Oil loses viscosity with increased temperature. Some oils maintain viscosity at higher temps but usually have a higher viscosity when cold.
There is a compromise using higher viscosity than OEM in that the can will not be as fuel efficient for daily driving but a forced induction or otherwise hyped up engine will reach higher peak temps, those temps will reduce oil viscosity which will in turn result in reduced oil pressure. This is risky for the engine's moving parts that rely on a certain pressure to keep things slick. For example on the HKS GT supercharger it is recommended to use 0W40 oil.
I would never recommend using that viscosity in a cold climate. It will not damage the engine to increase viscosity.
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