You are the only person that is going to be able to answer this question. It is like asking somebody if they think it is too hot to run. Everyone has a different tolerance to the weather, after all. It also depends on what gear you tag along, however.
If you buy a skimpy tent with skimpy sleeping bags and pillows, you may freeze your little tail off even during mild winter nights. This is why it is so vital to actually research what the weather is supposed to look like for your trip. While it can always change, you should at least have an idea.