Do you know what zone you are in?

Do you mean geographical area? If so - as per my post - I am in Southern California. Or am I not understanding your question?

Southern California covers a lot of territory and San Francisco is fairly different from San Diego from an inland mountain site, though all are in the southern half of the state. As an example, my sister in San Jose grows things that can tolerate frost since they get periodic frost, while someone in San Diego doesn't need to worry about that. Here is a link to the USDA zones which are less helpful in your area since they are only based on winter's coldest temperatures, and here are the Sunset zones which are more detailed for the western half of the country and along with winter lows take into account the high temperatures, lengths of growing seasons, humidity, and rainfall. Or if you just give us the nearest large city and tell us if you are close to the coast, that is most likely enough.

Thanks for explaining. I must say I always think of San Francisco and San Jose as being in Northern California! https://en.wikipedia.org/wiki/Northern_California

Anyway - I live in Los Angeles - so I enjoy a very warm climate. Probably quite similar to those who live in San Diego. I am inland in L.A. About 25 miles from the coast.

Hope that helps in coming up with some advice for this problem I'm trying to solve. Many thanks for your time and consideration.

I will qualify my suggestions with the warning that I have never gardened in zone 10, so do your own research on the plants I suggest. Any of these that I have grown has been in a pot, not in the ground, so I don't know how large they get or if their growth is likely to get away from you. I do have allergies and dislike most scented plants, though a few don't bother me, so I can understand the problem.

I have grown Mandevilla in a pot for several years since it doesn't survive our winters. I notice no scent to the flowers (either indoors or outside) which are trumpet-shaped and showy. It is a twining vine, so need something to twist around such as wires; it won't stick to a board fence on its own. It should be hardy in your zone, 10b.

There are a bunch of Bougainvillea species and selections you could check out which should be evergreen in your area. What look like flower petals are colorful bracts, but there are tiny flowers that have no scent. I honestly am not sure how they climb.

Thunbergia alata is another flowering vine that is evergreen in your zone. I've grown this and it's also totally unscented. Twining vine.

Creeping fig is a self-clinger, so doesn't need wires but will fasten right onto the fence itself. I would ask around at nurseries to see how much of a problem it might be in your area as far as unwanted spreading. I am also not sure how attractive it is since I've seen both nice and homely photos.