Generally speaking the weather conditions have to be pretty good – especially when you are a student skydiver going through your AFF course. This means only little cloud – because it’s important you can see the ground beneath you so that you know where you are in the sky – and light winds so that your parachute can be maneuvered easily.
Qualified, more experienced skydivers can jump in marginally windy conditions. You can technically skydive in light rain – but it is unpleasant to do so and also when it’s raining it tends to be cloudy! British summers are normally better than people give them credit for and it’s a great place to learn to skydive.