does temperature affect speaker performance?

Weather affects the power grid, so indirectly affects the speakers. High pressure systems are generally good for the sound, nice sunny ☀️ days, whereas low pressure systems, rainy, stormy days, are generally bad for the sound. Low humidity is generally bad for the sound, what with the static electric charge on everything. I suspect high solar activity is not good for the sound. If that concerns you the daily solar activity is tracked by National Weather Service. Since the acoustic waves all travel at the same speed at a given temperature, the sound should not be affected by changing the overall temperature in the room. However sound can be affected by making a change to temperature in part of the room. A cool trick is placing bowls of ice water on the floor out in front of the speakers. See what that does to the sound. 🤗

Driver surrounds, spiders are affected by temperature changes.   If cone speakers OP is talking about, it's likely the driver suspension parts.