I would like to add a timer to my setup. I just have one pump plugged into an outlet, and a switch controlling that outlet. Ideally, I would run in "timer mode" with the option to override the timer if I want to turn the pump on or off when it's not scheduled to.

Most of the timers I've seen are traditional electric timers in a waterproof housing. But if you want to adjust the timer or override it, you have to open that housing. Considering the area can be wet, I'm not fond of that option. So I'm looking for a timer that can be controlled while staying waterproof. Any recommendations?