If it were mine I would put in a terminal strip/strips (Screw Terminal Block) and make the connections inside the box. Would allow for adding on down the road. Not sure what code says about that Tom would know.
If the terminal strip were listed for the current, voltage, and size of wire to be connected it would be fine.
Since this is likely to end up being in a damp location I would want to use an insulated terminal such as the smallest version of the Polaris IT pre-insulated wire terminal line. [This happens to be the one I am familiar with I have no interest in the manufacturer other than as a supplier for products I have used successfully for similar situations.] The Polaris IT4 is a 2 port insulated terminal which will terminate sizes 4 to 14 American Wire Gauge. I believe that the Polaris insulated terminals come with anti corrosion paste already in the ports. If that turns out not to be true then buy a small quantity of Copper Based Anti-Oxidant Joint Compound. Make certain that you use a paste which is listed for the wire type you use. Do not make the mistake of using say Noalox on copper conductors. I would think that the Polaris terminals, or some other manufacturers offering of a similar device, would serve better than a terminal strip mounted in a outdoor box. The pre-insulated terminals are easier to use when connecting different sized conductors in a damp environment because of their inherent corrosion resistance.