Relative Humidity needs to be considered in the context of the temperature, it has little value without that detail. That’s what makes it “relative”, temperature.
If you keep the moisture level in the air constant, and raise the temperature, the RH will go down proportional to the temperature increase.
Unless it’s very hot, 25% RH is going to be pretty low “Absolute Humidity” (there is such a thing) and drying probably isn’t absolutely necessary. But it will depend to some extent on what you are printing and what filament type you’re using.
So ultimately, the answer to the question the OP asked is “if you’re happy with the print quality, you don’t need to dry your filament, it’s already dry enough”.