Worth knowing what too cold looks like so you can judge it next time rather than guessing: shivering that does not settle once he is dry, hunched posture with the tail tucked, hunting for warm spots, lethargy or odd weakness, and ears or feet cold to the touch.
Also, in winter you do not have to bathe him at all for most things. Spot clean muddy paws and belly with a damp cloth, brush him properly, which removes a surprising amount, and keep waterless shampoo or grooming wipes for touch-ups. Save the full bath for a milder day.