We advise not to use our scooters in heavy rain as they are only rated water resistant and not fully waterproof. If you get caught in the rain you should be fine but definitely do not leave your scooter outside exposed to heavy downpours.
Never submerge the footboard or the wheels deep under water - the battery and electric motors live there.
Also, as with a bike, be careful when it is wet as it’s possible to slip and fall - especially when crossing train tracks etc.