A water resistant switch assembly as a housing and cover. A reed switch is in the housing is connected to electrical wires extending out of the housing through an elastomeric grommet that seals to the housing. A plunger is mounted for longitudinal movement in the housing and supports a magnet which can move closer to the reed switch in one direction of motion and further away from the reed switch in the opposite direction. An elastomeric boot is between the housing and cover and also over the end of the plunger, thereby sealing the interior of the switch assembly. The boot has a flexible portion adjacent to the end of the plunger so that the plunger can be moved by pressing on the boot. This moves the magnet toward the reed switch to actuate the reed switch, and a spring biases the plunger and magnet away from the reed switch when pressure on the boot is relieved.