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check for blowed fuse or bad relay, you can hook test light to see if horn getting power when you press horn pad if fuse and relay okay,remove horn and hot wire it if it blows, more likely horn pad with airbag in steering wheel bad,if horn pad bad you have to replace whole airbag with with horn pad as a unit.if horn dont blow when hot wired then horn it self is bad.
I have a 1977 Cadillac Seville and it does the same thing, and when the outside temperature drops below 65 degrees the horn will sound continuously until either the horn relay or the horn fuse is removed.
The problem is in the horn pad on the steering wheel, and the contact plates inside of the horn pad are too close together (a manufacturing defect) and when the temperature drops down to a certain degree then the horn pad will contract and cause the metal contact plates inside of the horn pad to touch and make contact, and it is same thing as if you were pushing on the horn pad.
I have also heard of the exact opposite happening and when the temperature gets too hot the horn pad will expand and cause the metal contact plates to touch and make contact and activating the horn.
Could be bad horn or relay or the horn'button'.Start at the horn with a test light.Have someone push horn button and check for power at the horn.If no power then trace wires to relay,check for power cominginto relay.If power is going in but not out to horn relay is problem.etc. Some horns have a lttle knob you can turn to adjust them and get them working
was it hot outside-heat could deform the steering wheel horn pad and make the horn go off,remove the horn pad and airbag unit(take fuse out for airbag system wait a few mins)then put the fuse that you removed back in place and see if the horn goes off again.