When travelling, we recommend packing in preparation to handle common weather conditions. The rainfall in Gatwick is typically greater than that of Cartagena. We can gather that this will continue over the next 12 days.
Expect the weather to be around 32 °C on average in May. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Cartagena is generally hotter than in Gatwick.