Temperatures are cooling down, and if you work out outside, you are going to need to lengthen your warm up time. It seems obvious, but our muscles and joints take more time to warm up in the cooler weather.
So you need to factor in the temperature when warming up. The cooler the weather, the longer the warm up. Especially if you are running in the morning and it is cold, add at least five minutes to your warm up pace before kicking into high gear. Also, save intervals for the latter part of a run to decrease your chance of pulling a muscle.
Also, since it is cool outside you may not feel the need to cool down, but I am here to remind you not to skip this important part of your workout. You need to give your heart time to slowly lower. You should pay attention to your heart rate, not your body temperature. You are cooled down when your heart rate and breathing rate have returned to normal.
Want to know more about the importance of the cool down? Then be sure to check out 5 Things: The Cool Down.