Running in hot weather can be very difficult, especially when you live in a variable climate such as the UK, where the weather go range from very hot to very cold.
It is important when running in the heat to run with the correct pacing for the distance. If you are running 5k, 10k, half marathon, marathon or whatever, if the weather is hot you will not be able to run to the best of your ability. You need to run with the correct hydration strategy. Make sure you wear sun cream. Where the correct running clothes.
Running with correct technique can help prevent running injuries such as shin splints and runner knee. Running with correct barefoot running form will absorb the impact through your muscles and tendons, rather than your hips, knees and other joints when heel striking.