Will my septum stay big after rhinoplasty? 5 months post-op. (Photo)

5 months after Rhinoplasty it's very unlikely that the width of the septum will change any more. The width of the area that you are showing in the photo is not an area that is only affected by the septum, it could also be affected by the lower cartilage of the nose. I would recommend following up with your surgeon. 

Many times, different areas of the nose will swell for several weeks to months, and the final result is expected at 1 year+.  Relay your concerns to your surgeon, as he or she may inject dilute steroids to assist in the reduction of swelling.

You should ask your surgeon what is the swelling due to? It can take up to a year to see the final outcome but it would be helpful to know if the septum has been like this from day one in the post op period or whether it has happened later on.

It's likely that at least some of this is due to swelling and will slowly resolve over another 5 months or so.  Have you talked to your surgeon about it? If not, you should.  He or she should be able to provide a better answer.Swelling Can last for up to a year after a rhinoplasty and depending on how much work was done in the area of the bottom of the septum could possibly last even a little bit longer.  Be patient.  Talk to your surgeon.  Good luck.

I believe you are referring to your columella, which is the middle of the base of the nose. It is made of soft tissue surrounded on each side by the lower lateral cartilages. I am sure it is still swollwen as your description of the "squishy" sensation on touching it. Soft tissue swelling can be soft or firm. Keep an eye on things for a year, and continue to see your surgeon regularly as you heal.