No, the iPhone SE is not waterproof. Apple still hasn't released a 100 percent waterproof device. The closest waterproof device is the Apple Watch, which has a water resistance rating of IPX7 under IEC standard 60529. There have been rumors that Apple's next-generation devices may be waterproof. This means if the rumors are true, the iPhone 7 would most likely be Apple's first fully waterproof iOS device.
Is the iPhone SE waterproof?