A mixed bag on Thursday in Barcelona.
Firstly, there are no Lightning warnings! There should not be any rain!
There will be some cloud cover, which will have an effect to reduce the temperature, seeing a max during the racing period of 23°.
The wind for Thursday in Barcelona (Thursday night here in NZ) is light. The forecast currently has 5 knots of wind Thursday afternoon, which comes up during the day, at lunchtime there will be no wind.
So, we see a risk on Thursday, not from the lightning, but now from lack of wind.