London's unpredictable weather can be a concern, but most party boats are equipped with indoor spaces and covered areas to protect guests from rain or wind. For instance, The Copper Quay is equipped with a changeable open-top, allowing guests to enjoy the views during good weather and easily transform into a covered roof if needed. In the event of severe weather conditions, some boat operators may offer rescheduling options or refunds. It's always a good idea to check with the boat company beforehand to understand their policies regarding challenging weather.